CINXE.COM

What is kA rating of MCB and MCCB?

<!DOCTYPE html><html class="html" lang="en-US" prefix="og: https://ogp.me/ns#"><head><script type="text/javascript" src="/_static/js/bundle-playback.js?v=HxkREWBo" charset="utf-8"></script> <script type="text/javascript" src="/_static/js/wombat.js?v=txqj7nKC" charset="utf-8"></script> <script>window.RufflePlayer=window.RufflePlayer||{};window.RufflePlayer.config={"autoplay":"on","unmuteOverlay":"hidden"};</script> <script type="text/javascript" src="/_static/js/ruffle/ruffle.js"></script> <script type="text/javascript"> __wm.init("https://web.archive.org/web"); __wm.wombat("https://www.electricalclassroom.com/what-is-ka-rating-of-mcb-mccb/","20210422144856","https://web.archive.org/","web","/_static/", "1619102936"); </script> <link rel="stylesheet" type="text/css" href="/_static/css/banner-styles.css?v=S1zqJCYt" /> <link rel="stylesheet" type="text/css" href="/_static/css/iconochive.css?v=3PDvdIFv" /> <!-- End Wayback Rewrite JS Include --> <meta charset="UTF-8"/> <script data-ezscrex="false" data-cfasync="false" data-pagespeed-no-defer>var __ez=__ez||{};__ez.stms=Date.now();__ez.evt={};__ez.script={};__ez.ck=__ez.ck||{};__ez.template={};__ez.template.isOrig=true;__ez.queue=(function(){var count=0,incr=0,items=[],timeDelayFired=false,hpItems=[],lpItems=[],allowLoad=true;var obj={func:function(name,funcName,parameters,isBlock,blockedBy,deleteWhenComplete,proceedIfError){var self=this;this.name=name;this.funcName=funcName;this.parameters=parameters===null?null:(parameters instanceof Array)?parameters:[parameters];this.isBlock=isBlock;this.blockedBy=blockedBy;this.deleteWhenComplete=deleteWhenComplete;this.isError=false;this.isComplete=false;this.isInitialized=false;this.proceedIfError=proceedIfError;this.isTimeDelay=false;this.process=function(){log("... func = "+name);self.isInitialized=true;self.isComplete=true;log("... func.apply: "+name);var funcs=self.funcName.split('.');var func=null;if(funcs.length>3){}else if(funcs.length===3){func=window[funcs[0]][funcs[1]][funcs[2]];}else if(funcs.length===2){func=window[funcs[0]][funcs[1]];}else{func=window[self.funcName];} if(typeof func!=='undefined'&&func!==null){func.apply(null,this.parameters);} if(self.deleteWhenComplete===true)delete items[name];if(self.isBlock===true){log("----- F'D: "+self.name);processAll();}}},file:function(name,path,isBlock,blockedBy,async,defer,proceedIfError){var self=this;this.name=name;this.path=path;this.async=async;this.defer=defer;this.isBlock=isBlock;this.blockedBy=blockedBy;this.isInitialized=false;this.isError=false;this.isComplete=false;this.proceedIfError=proceedIfError;this.isTimeDelay=false;this.process=function(){self.isInitialized=true;log("... file = "+name);var scr=document.createElement('script');scr.src=path;if(async===true)scr.async=true;else if(defer===true)scr.defer=true;scr.onerror=function(){log("----- ERR'D: "+self.name);self.isError=true;if(self.isBlock===true){processAll();}};scr.onreadystatechange=scr.onload=function(){var state=scr.readyState;log("----- F'D: "+self.name);if((!state||/loaded|complete/.test(state))){self.isComplete=true;if(self.isBlock===true){processAll();}}};document.getElementsByTagName('head')[0].appendChild(scr);}},fileLoaded:function(name,isComplete){this.name=name;this.path="";this.async=false;this.defer=false;this.isBlock=false;this.blockedBy=[];this.isInitialized=true;this.isError=false;this.isComplete=isComplete;this.proceedIfError=false;this.isTimeDelay=false;this.process=function(){};}};function init(){window.addEventListener("load",function(){setTimeout(function(){timeDelayFired=true;log('TDELAY -----');processAll();},5000);},false);} function addFile(name,path,isBlock,blockedBy,async,defer,proceedIfError,priority){var item=new obj.file(name,path,isBlock,blockedBy,async,defer,proceedIfError);if(priority===true){hpItems[name]=item}else{lpItems[name]=item} items[name]=item;checkIfBlocked(item);} function setallowLoad(settobool){allowLoad=settobool} function addFunc(name,func,parameters,isBlock,blockedBy,autoInc,deleteWhenComplete,proceedIfError,priority){if(autoInc===true)name=name+"_"+incr++;var item=new obj.func(name,func,parameters,isBlock,blockedBy,deleteWhenComplete,proceedIfError);if(priority===true){hpItems[name]=item}else{lpItems[name]=item} items[name]=item;checkIfBlocked(item);} function addTimeDelayFile(name,path){var item=new obj.file(name,path,false,[],false,false,true);item.isTimeDelay=true;log(name+' ... '+' FILE! TDELAY');lpItems[name]=item;items[name]=item;checkIfBlocked(item);} function addTimeDelayFunc(name,func,parameters){var item=new obj.func(name,func,parameters,false,[],true,true);item.isTimeDelay=true;log(name+' ... '+' FUNCTION! TDELAY');lpItems[name]=item;items[name]=item;checkIfBlocked(item);} function checkIfBlocked(item){if(isBlocked(item)===true||allowLoad==false)return;item.process();} function isBlocked(item){if(item.isTimeDelay===true&&timeDelayFired===false){log(item.name+" blocked = TIME DELAY!");return true;} if(item.blockedBy instanceof Array){for(var i=0;i<item.blockedBy.length;i++){var block=item.blockedBy[i];if(items.hasOwnProperty(block)===false){log(item.name+" blocked = "+block);return true;}else if(item.proceedIfError===true&&items[block].isError===true){return false;}else if(items[block].isComplete===false){log(item.name+" blocked = "+block);return true;}}} return false;} function markLoaded(filename){if(!filename||0===filename.length){return;} if(filename in items){var item=items[filename];if(item.isComplete===true){log(item.name+' '+filename+': error loaded duplicate')}else{item.isComplete=true;item.isInitialized=true;}}else{items[filename]=new obj.fileLoaded(filename,true);} log("Added dummyfile: "+items[filename]);} function log(msg){var href=window.location.href;var reg=new RegExp('[?&]ezq=([^&#]*)','i');var string=reg.exec(href);var res=string?string[1]:null;if(res==="1")console.debug(msg);} function processAll(){count++;if(count>200)return;log("let's go");processItems(hpItems);processItems(lpItems);} function processItems(list){for(var i in list){if(list.hasOwnProperty(i)===false)continue;var item=list[i];if(item.isComplete===true||isBlocked(item)||item.isInitialized===true||item.isError===true){if(item.isError===true){log(item.name+': error')}else if(item.isComplete===true){log(item.name+': complete already')}else if(item.isInitialized===true){log(item.name+': initialized already')}}else{item.process();}}} init();return{addFile:addFile,addDelayFile:addTimeDelayFile,addFunc:addFunc,addDelayFunc:addTimeDelayFunc,items:items,processAll:processAll,setallowLoad:setallowLoad,markLoaded:markLoaded,};})();__ez.evt.add=function(e,t,n){e.addEventListener?e.addEventListener(t,n,!1):e.attachEvent?e.attachEvent("on"+t,n):e["on"+t]=n()},__ez.evt.remove=function(e,t,n){e.removeEventListener?e.removeEventListener(t,n,!1):e.detachEvent?e.detachEvent("on"+t,n):delete e["on"+t]};__ez.script.add=function(e){var t=document.createElement("script");t.src=e,t.async=!0,t.type="text/javascript",document.getElementsByTagName("head")[0].appendChild(t)};__ez.dot={};__ez.queue.addFile('/detroitchicago/boise.js', '/detroitchicago/boise.js?gcb=194-0&cb=1', false, [], true, false, true, false);__ez.queue.addFile('/detroitchicago/memphis.js', '/detroitchicago/memphis.js?gcb=194-0&cb=7', false, [], true, false, true, false);__ez.queue.addFile('/detroitchicago/minneapolis.js', '/detroitchicago/minneapolis.js?gcb=194-0&cb=3', false, [], true, false, true, false);__ez.queue.addFile('/detroitchicago/rochester.js', '/detroitchicago/rochester.js?gcb=194-0&cb=10', false, ['/detroitchicago/memphis.js','/detroitchicago/minneapolis.js'], true, false, true, false);__ez.vep=(function(){var pixels=[],pxURL="/detroitchicago/grapefruit.gif";function AddPixel(vID,pixelData){if(__ez.dot.isDefined(vID)&&__ez.dot.isValid(pixelData)){pixels.push({type:'video',video_impression_id:vID,domain_id:__ez.dot.getDID(),t_epoch:__ez.dot.getEpoch(0),data:__ez.dot.dataToStr(pixelData)});}} function Fire(){if(typeof document.visibilityState!=='undefined'&&document.visibilityState==="prerender"){return;} if(__ez.dot.isDefined(pixels)&&pixels.length>0){while(pixels.length>0){var j=5;if(j>pixels.length){j=pixels.length;} var pushPixels=pixels.splice(0,j);var pixelURL=__ez.dot.getURL(pxURL)+"?orig="+(__ez.template.isOrig===true?1:0)+"&v="+btoa(JSON.stringify(pushPixels));__ez.dot.Fire(pixelURL);}} pixels=[];} return{Add:AddPixel,Fire:Fire};})();</script><script data-ezscrex="false" data-cfasync="false" data-pagespeed-no-defer>__ez.pel=(function(){var pixels=[],pxURL="/porpoiseant/army.gif";function AddAndFirePixel(adSlot,pixelData){AddPixel(adSlot,pixelData,0,0,0,0,0);Fire();} function AddAndFireOrigPixel(adSlot,pixelData){AddPixel(adSlot,pixelData,0,0,0,0,0,true);Fire();} function GetCurrentPixels(){return pixels;} function AddPixel(adSlot,pixelData,revenue,est_revenue,bid_floor_filled,bid_floor_prev,stat_source_id,isOrig){if(!__ez.dot.isDefined(adSlot)||__ez.dot.isAnyDefined(adSlot.getSlotElementId,adSlot.ElementId)==false){return;} var ad_position_id=parseInt(__ez.dot.getTargeting(adSlot,'ap'));var impId=__ez.dot.getSlotIID(adSlot),adUnit=__ez.dot.getAdUnit(adSlot,isOrig);var compId=parseInt(__ez.dot.getTargeting(adSlot,"compid"));var lineItemId=0;var creativeId=0;var ezimData=getEzimData(adSlot);if(typeof ezimData=='object'){if(ezimData.creative_id!==undefined){creativeId=ezimData.creative_id;} if(ezimData.line_item_id!==undefined){lineItemId=ezimData.line_item_id;}} if(__ez.dot.isDefined(impId,adUnit)&&__ez.dot.isValid(pixelData)){pixels.push({type:"impression",impression_id:impId,domain_id:__ez.dot.getDID(),unit:adUnit,t_epoch:__ez.dot.getEpoch(0),revenue:revenue,est_revenue:est_revenue,ad_position:ad_position_id,ad_size:"",bid_floor_filled:bid_floor_filled,bid_floor_prev:bid_floor_prev,stat_source_id:stat_source_id,country_code:__ez.dot.getCC(),pageview_id:__ez.dot.getPageviewId(),comp_id:compId,line_item_id:lineItemId,creative_id:creativeId,data:__ez.dot.dataToStr(pixelData),is_orig:isOrig||__ez.template.isOrig,});}} function AddPixelById(impFullId,pixelData,isOrig){var vals=impFullId.split('/');if(__ez.dot.isDefined(impFullId)&&vals.length===3&&__ez.dot.isValid(pixelData)){var adUnit=vals[0],impId=vals[2];pixels.push({type:"impression",impression_id:impId,domain_id:__ez.dot.getDID(),unit:adUnit,t_epoch:__ez.dot.getEpoch(0),pageview_id:__ez.dot.getPageviewId(),data:__ez.dot.dataToStr(pixelData),is_orig:isOrig||__ez.template.isOrig});}} function Fire(){if(typeof document.visibilityState!=='undefined'&&document.visibilityState==="prerender")return;if(__ez.dot.isDefined(pixels)&&pixels.length>0){var allPixels=[pixels.filter(function(pixel){return pixel.is_orig}),pixels.filter(function(pixel){return!pixel.is_orig})];allPixels.forEach(function(pixels){while(pixels.length>0){var isOrig=pixels[0].is_orig||false;var j=5;if(j>pixels.length){j=pixels.length;} var pushPixels=pixels.splice(0,j);var pixelURL=__ez.dot.getURL(pxURL)+"?orig="+(isOrig===true?1:0)+"&sts="+btoa(JSON.stringify(pushPixels));if(typeof window.isAmp!=='undefined'&&isAmp&&typeof window._ezaq!=='undefined'&&_ezaq.hasOwnProperty("domain_id")){pixelURL+="&visit_uuid="+_ezaq['visit_uuid'];} __ez.dot.Fire(pixelURL);}})} pixels=[];} function getEzimData(adSlot){if(typeof _ezim_d=="undefined"){return false} var adUnitName=__ez.dot.getAdUnitPath(adSlot).split('/').pop();if(typeof _ezim_d==='object'&&_ezim_d.hasOwnProperty(adUnitName)){return _ezim_d[adUnitName];} for(var ezimKey in _ezim_d){if(ezimKey.split('/').pop()===adUnitName){return _ezim_d[ezimKey];}} return false;} return{Add:AddPixel,AddAndFire:AddAndFirePixel,AddAndFireOrig:AddAndFireOrigPixel,AddById:AddPixelById,Fire:Fire,GetPixels:GetCurrentPixels,};})();__ez.queue.addFile('/detroitchicago/raleigh.js', '/detroitchicago/raleigh.js?gcb=194-0&cb=5', false, [], true, false, true, false);__ez.queue.addFile('/detroitchicago/tampa.js', '/detroitchicago/tampa.js?gcb=194-0&cb=3', false, [], true, false, true, false);</script> <script data-ezscrex="false" data-cfasync="false">(function(){if("function"===typeof window.CustomEvent)return!1;window.CustomEvent=function(c,a){a=a||{bubbles:!1,cancelable:!1,detail:null};var b=document.createEvent("CustomEvent");b.initCustomEvent(c,a.bubbles,a.cancelable,a.detail);return b}})();</script><script data-ezscrex="false" data-cfasync="false">__ez.queue.addFile('/detroitchicago/tulsa.js', '/detroitchicago/tulsa.js?gcb=194-0&cb=5', false, [], true, false, true, false);</script> <link rel="profile" href="https://gmpg.org/xfn/11"/> <meta name="viewport" content="width=device-width, initial-scale=1"/> <title>What is kA rating of MCB and MCCB?</title><style id="rocket-critical-css">.wp-block-columns{display:flex;margin-bottom:1.75em;flex-wrap:wrap}@media (min-width:782px){.wp-block-columns{flex-wrap:nowrap}}.wp-block-columns.are-vertically-aligned-center{align-items:center}.wp-block-column{flex-grow:1;min-width:0;word-break:break-word;overflow-wrap:break-word}@media (max-width:599px){.wp-block-column{flex-basis:100%!important}}@media (min-width:600px) and (max-width:781px){.wp-block-column:not(:only-child){flex-basis:calc(50% - 1em)!important;flex-grow:0}.wp-block-column:nth-child(2n){margin-left:2em}}@media (min-width:782px){.wp-block-column{flex-basis:0;flex-grow:1}.wp-block-column:not(:first-child){margin-left:2em}}.wp-block-column.is-vertically-aligned-center{-ms-grid-row-align:center;align-self:center}.wp-block-column.is-vertically-aligned-center{width:100%}.wp-block-group{box-sizing:border-box}.wp-block-group.has-background{padding:1.25em 2.375em;margin-top:0;margin-bottom:0}[data-aos^=fade][data-aos^=fade]{opacity:0}[data-aos^=fade][data-aos^=fade].ai-center-v{transform:translate(0,-50%)}[data-aos^=fade][data-aos^=fade].ai-center-h{transform:translate(-50%)}[data-aos^=fade][data-aos^=fade].ai-center-h.ai-center-v{transform:translate(-50%,-50%)}#cookie-law-info-bar{font-size:15px;margin:0 auto;padding:12px 10px;position:absolute;text-align:center;box-sizing:border-box;width:100%;z-index:9999;display:none;left:0;font-weight:300;box-shadow:0 -1px 10px 0 rgba(172,171,171,.3)}#cookie-law-info-again{font-size:10pt;margin:0;padding:5px 10px;text-align:center;z-index:9999;box-shadow:#161616 2px 2px 5px 2px}#cookie-law-info-bar span{vertical-align:middle}.cli-plugin-button,.cli-plugin-button:visited{display:inline-block;padding:9px 12px;color:#fff;text-decoration:none;position:relative;margin-left:5px;text-decoration:none}.cli-plugin-main-link{margin-left:0;font-weight:550;text-decoration:underline}.cli-plugin-button,.cli-plugin-button:visited,.medium.cli-plugin-button,.medium.cli-plugin-button:visited{font-size:13px;font-weight:400;line-height:1}.cli-plugin-button{margin-top:5px}.cli-bar-popup{-moz-background-clip:padding;-webkit-background-clip:padding;background-clip:padding-box;-webkit-border-radius:30px;-moz-border-radius:30px;border-radius:30px;padding:20px}.cli-plugin-main-link.cli-plugin-button{text-decoration:none}.cli-plugin-main-link.cli-plugin-button{margin-left:5px}.cli-container-fluid{padding-right:15px;padding-left:15px;margin-right:auto;margin-left:auto}.cli-row{display:-ms-flexbox;display:flex;-ms-flex-wrap:wrap;flex-wrap:wrap;margin-right:-15px;margin-left:-15px}.cli-align-items-stretch{-ms-flex-align:stretch!important;align-items:stretch!important}.cli-px-0{padding-left:0;padding-right:0}.cli-btn{font-size:14px;display:inline-block;font-weight:400;text-align:center;white-space:nowrap;vertical-align:middle;border:1px solid transparent;padding:.5rem 1.25rem;line-height:1;border-radius:.25rem}.cli-modal-backdrop{position:fixed;top:0;right:0;bottom:0;left:0;z-index:1040;background-color:#000;display:none}.cli-modal-backdrop.cli-fade{opacity:0}.cli-modal a{text-decoration:none}.cli-modal .cli-modal-dialog{position:relative;width:auto;margin:.5rem;font-family:-apple-system,BlinkMacSystemFont,segoe ui,Roboto,helvetica neue,Arial,sans-serif,apple color emoji,segoe ui emoji,segoe ui symbol;font-size:1rem;font-weight:400;line-height:1.5;color:#212529;text-align:left;display:-ms-flexbox;display:flex;-ms-flex-align:center;align-items:center;min-height:calc(100% - (.5rem * 2))}@media (min-width:576px){.cli-modal .cli-modal-dialog{max-width:500px;margin:1.75rem auto;min-height:calc(100% - (1.75rem * 2))}}@media (min-width:992px){.cli-modal .cli-modal-dialog{max-width:900px}}.cli-modal-content{position:relative;display:-ms-flexbox;display:flex;-ms-flex-direction:column;flex-direction:column;width:100%;background-color:#fff;background-clip:padding-box;border-radius:.3rem;outline:0}.cli-modal .cli-modal-close{position:absolute;right:10px;top:10px;z-index:1;padding:0;background-color:transparent;border:0;-webkit-appearance:none;font-size:1.5rem;font-weight:700;line-height:1;color:#000;text-shadow:0 1px 0 #fff}.cli-switch{display:inline-block;position:relative;min-height:1px;padding-left:70px;font-size:14px}.cli-switch input[type=checkbox]{display:none}.cli-switch .cli-slider{background-color:#e3e1e8;height:24px;width:50px;bottom:0;left:0;position:absolute;right:0;top:0}.cli-switch .cli-slider:before{background-color:#fff;bottom:2px;content:"";height:20px;left:2px;position:absolute;width:20px}.cli-switch input:checked+.cli-slider{background-color:#00acad}.cli-switch input:checked+.cli-slider:before{transform:translateX(26px)}.cli-switch .cli-slider{border-radius:34px}.cli-switch .cli-slider:before{border-radius:50%}.cli-tab-content{background:#fff}.cli-tab-content{width:100%;padding:30px}@media (max-width:767px){.cli-tab-content{padding:30px 10px}}.cli-tab-content p{color:#343438;font-size:14px;margin-top:0}.cli-container-fluid{padding-right:15px;padding-left:15px;margin-right:auto;margin-left:auto}.cli-row{display:-ms-flexbox;display:flex;-ms-flex-wrap:wrap;flex-wrap:wrap;margin-right:-15px;margin-left:-15px}.cli-align-items-stretch{-ms-flex-align:stretch!important;align-items:stretch!important}.cli-px-0{padding-left:0;padding-right:0}.cli-btn{font-size:14px;display:inline-block;font-weight:400;text-align:center;white-space:nowrap;vertical-align:middle;border:1px solid transparent;padding:.5rem 1.25rem;line-height:1;border-radius:.25rem}.cli-modal-backdrop{position:fixed;top:0;right:0;bottom:0;left:0;z-index:1040;background-color:#000;-webkit-transform:scale(0);transform:scale(0)}.cli-modal-backdrop.cli-fade{opacity:0}.cli-modal{position:fixed;top:0;right:0;bottom:0;left:0;z-index:99999;transform:scale(0);overflow:hidden;outline:0}.cli-modal a{text-decoration:none}.cli-modal .cli-modal-dialog{position:relative;width:auto;margin:.5rem;font-family:inherit;font-size:1rem;font-weight:400;line-height:1.5;color:#212529;text-align:left;display:-ms-flexbox;display:flex;-ms-flex-align:center;align-items:center;min-height:calc(100% - (.5rem * 2))}@media (min-width:576px){.cli-modal .cli-modal-dialog{max-width:500px;margin:1.75rem auto;min-height:calc(100% - (1.75rem * 2))}}.cli-modal-content{position:relative;display:-ms-flexbox;display:flex;-ms-flex-direction:column;flex-direction:column;width:100%;background-color:#fff;background-clip:padding-box;border-radius:.2rem;box-sizing:border-box;outline:0}.cli-switch{display:inline-block;position:relative;min-height:1px;padding-left:38px;font-size:14px}.cli-switch input[type=checkbox]{display:none}.cli-switch .cli-slider{background-color:#e3e1e8;height:20px;width:38px;bottom:0;left:0;position:absolute;right:0;top:0}.cli-switch .cli-slider:before{background-color:#fff;bottom:2px;content:"";height:15px;left:3px;position:absolute;width:15px}.cli-switch input:checked+.cli-slider{background-color:#61a229}.cli-switch input:checked+.cli-slider:before{transform:translateX(18px)}.cli-switch .cli-slider{border-radius:34px;font-size:0}.cli-switch .cli-slider:before{border-radius:50%}.cli-tab-content{background:#fff}.cli-tab-content{width:100%;padding:5px 30px 5px 5px;box-sizing:border-box}@media (max-width:767px){.cli-tab-content{padding:30px 10px}}.cli-tab-content p{color:#343438;font-size:14px;margin-top:0}.cli-tab-footer .cli-btn{background-color:#00acad;padding:10px 15px;text-decoration:none}.cli-tab-footer .wt-cli-privacy-accept-btn{background-color:#61a229;color:#fff;border-radius:0}.cli-tab-footer{width:100%;text-align:right;padding:20px 0}.cli-col-12{width:100%}.cli-tab-header{display:flex;justify-content:space-between}.cli-tab-header a:before{width:10px;height:2px;left:0;top:calc(50% - 1px)}.cli-tab-header a:after{width:2px;height:10px;left:4px;top:calc(50% - 5px);-webkit-transform:none;transform:none}.cli-tab-header a:before{width:7px;height:7px;border-right:1px solid #4a6e78;border-bottom:1px solid #4a6e78;content:" ";transform:rotate(-45deg);margin-right:10px}.cli-tab-header a.cli-nav-link{position:relative;display:flex;align-items:center;font-size:14px;color:#000;text-transform:capitalize}.cli-tab-header{border-radius:5px;padding:12px 15px;background-color:#f2f2f2}.cli-modal .cli-modal-close{position:absolute;right:0;top:0;z-index:1;-webkit-appearance:none;width:40px;height:40px;padding:0;border-radius:50%;padding:10px;background:0 0;border:none;min-width:40px}.cli-tab-container h4{font-family:inherit;font-size:16px;margin-bottom:15px;margin:10px 0}#cliSettingsPopup .cli-tab-section-container{padding-top:12px}.cli-tab-container p,.cli-privacy-content-text{font-size:14px;line-height:1.4;margin-top:0;padding:0;color:#000}.cli-tab-content{display:none}.cli-tab-section .cli-tab-content{padding:10px 20px 5px}.cli-tab-section{margin-top:5px}@media (min-width:992px){.cli-modal .cli-modal-dialog{max-width:645px}}.cli-switch .cli-slider:after{content:attr(data-cli-disable);position:absolute;right:50px;color:#000;font-size:12px;text-align:right;min-width:80px}.cli-switch input:checked+.cli-slider:after{content:attr(data-cli-enable)}.cli-privacy-overview:not(.cli-collapsed) .cli-privacy-content{max-height:60px;overflow:hidden}a.cli-privacy-readmore{font-size:12px;margin-top:12px;display:inline-block;padding-bottom:0;color:#000;text-decoration:underline}.cli-modal-footer{position:relative}a.cli-privacy-readmore:before{content:attr(data-readmore-text)}.cli-modal-close svg{fill:#000}span.cli-necessary-caption{color:#000;font-size:12px}.cli-tab-container .cli-row{max-height:500px;overflow-y:auto}.wt-cli-sr-only{display:none;font-size:16px}.wt-cli-necessary-checkbox{display:none!important}.wt-cli-privacy-overview-actions{padding-bottom:0}.fa,.fab{-moz-osx-font-smoothing:grayscale;-webkit-font-smoothing:antialiased;display:inline-block;font-style:normal;font-variant:normal;text-rendering:auto;line-height:1}.fa-angle-down:before{content:"\f107"}.fa-angle-right:before{content:"\f105"}.fa-angle-up:before{content:"\f106"}.fa-bars:before{content:"\f0c9"}.fa-facebook:before{content:"\f09a"}.fa-instagram:before{content:"\f16d"}.fa-pinterest-p:before{content:"\f231"}.fa-twitter:before{content:"\f099"}.fa-youtube:before{content:"\f167"}.fab{font-family:"Font Awesome 5 Brands"}.fab{font-weight:400}.fa{font-family:"Font Awesome 5 Free"}.fa{font-weight:900}.icon-magnifier{font-family:'simple-line-icons';speak:none;font-style:normal;font-weight:normal;font-variant:normal;text-transform:none;line-height:1;-webkit-font-smoothing:antialiased;-moz-osx-font-smoothing:grayscale}.icon-magnifier:before{content:"\e090"}button::-moz-focus-inner{padding:0;border:0} html,body,div,span,iframe,h1,h2,h4,h5,p,a,ins,i,ul,li,form,label,table,tbody,tr,td,article,aside,header,nav{margin:0;padding:0;border:0;outline:0;font-size:100%;font:inherit;vertical-align:baseline;font-family:inherit;font-size:100%;font-style:inherit;font-weight:inherit}article,aside,header,nav{display:block}html{font-size:62.5%;overflow-y:scroll;-webkit-text-size-adjust:100%;-ms-text-size-adjust:100%}*,*:before,*:after{-webkit-box-sizing:border-box;-moz-box-sizing:border-box;box-sizing:border-box}article,aside,header,main,nav{display:block}table{border-collapse:collapse;border-spacing:0}td{font-weight:normal;text-align:left}select{max-width:100%}html{-ms-overflow-x:hidden;overflow-x:hidden}body{font-family:"Open Sans",sans-serif;font-size:14px;line-height:1.8;color:#4a4a4a;-webkit-font-smoothing:antialiased;-moz-osx-font-smoothing:grayscale;overflow-wrap:break-word;word-wrap:break-word}body{background-color:#fff}i{font-style:italic}.screen-reader-text{border:0;clip:rect(1px,1px,1px,1px);clip-path:inset(50%);height:1px;margin:-1px;font-size:14px!important;font-weight:400;overflow:hidden;padding:0;position:absolute!important;width:1px;word-wrap:normal!important}html{font-family:sans-serif;-ms-text-size-adjust:100%;-webkit-text-size-adjust:100%}body{margin:0}article,aside,header,main,nav{display:block}a{background-color:transparent}svg:not(:root){overflow:hidden}button,input,select{color:inherit;font:inherit;margin:0}button{overflow:visible}button,select{text-transform:none}button{-webkit-appearance:button}button::-moz-focus-inner,input::-moz-focus-inner{border:0;padding:0}input{line-height:normal}input[type="checkbox"]{-webkit-box-sizing:border-box;-moz-box-sizing:border-box;box-sizing:border-box;padding:0}input[type="number"]::-webkit-inner-spin-button,input[type="number"]::-webkit-outer-spin-button{height:auto}input[type="search"]::-webkit-search-cancel-button,input[type="search"]::-webkit-search-decoration{-webkit-appearance:none}table{border-collapse:collapse;border-spacing:0}td{padding:0}.container{width:1200px;max-width:90%;margin:0 auto}#wrap{position:relative}#main{position:relative}#main #content-wrap{padding-top:50px;padding-bottom:50px}.content-area{float:left;position:relative;width:72%;padding-right:30px;border-right-width:1px;border-style:solid;border-color:#f1f1f1}.widget-area{width:28%}.widget-area.sidebar-primary{float:right;padding-left:30px}.boxed-layout{background-color:#e9e9e9}.boxed-layout #wrap{width:1280px;max-width:100%;margin:0 auto;background-color:#fff}.boxed-layout.wrap-boxshadow #wrap{-webkit-box-shadow:0 1px 4px rgba(0,0,0,0.15);-moz-box-shadow:0 1px 4px rgba(0,0,0,0.15);box-shadow:0 1px 4px rgba(0,0,0,0.15)}.boxed-layout #wrap .container{width:auto;max-width:none;padding-left:30px;padding-right:30px}@media only screen and (max-width:959px){.boxed-layout #wrap{overflow:hidden}.container{max-width:90%}.content-area{float:none!important;width:100%;margin-bottom:40px;border:0}body:not(.separate-layout) .content-area{padding:0!important}.widget-area.sidebar-primary{float:none!important;width:100%;padding:0!important;border:0}#main #content-wrap.container{width:auto!important}}@media only screen and (min-width:768px) and (max-width:959px){body.boxed-layout #wrap{width:auto!important}}@media only screen and (max-width:767px){#wrap{width:100%!important}body.boxed-layout #wrap{width:auto!important}.boxed-layout #top-bar-social.top-bar-left{left:auto}}@media only screen and (max-width:480px){.boxed-layout #wrap .container{padding-left:20px;padding-right:20px}}iframe{width:100%;max-width:100%}table{width:100%;margin-bottom:2.618em}table td{padding:10px;text-align:left;vertical-align:top;border-bottom:1px solid #e9e9e9}.clr:after{content:'';display:block;visibility:hidden;clear:both;zoom:1;height:0}a{color:#333}a{text-decoration:none}h1,h2,h4,h5{font-weight:600;margin:0 0 20px;color:#333;line-height:1.4}h1{font-size:23px}h2{font-size:20px}h4{font-size:17px}h5{font-size:15px}p{margin:0 0 20px}ul{margin:15px 0 15px 20px}li ul{margin:0 0 0 25px}form input[type="search"]{display:inline-block;min-height:40px;width:100%;font-size:14px;line-height:1.8;padding:6px 12px;vertical-align:middle;background-color:transparent;color:#333;border:1px solid #ddd;-webkit-border-radius:3px;-moz-border-radius:3px;-ms-border-radius:3px;border-radius:3px}input[type="search"]{-webkit-appearance:none}input[type="search"]::-webkit-search-decoration,input[type="search"]::-webkit-search-cancel-button,input[type="search"]::-webkit-search-results-button,input[type="search"]::-webkit-search-results-decoration{display:none}input[type="checkbox"]{display:inline-block;background-color:#fff;border:1px solid #bbb;line-height:0;width:16px;min-width:16px;height:16px;margin:-3px 10px 0 0;outline:0;text-align:center;vertical-align:middle;clear:none;-webkit-appearance:none;-webkit-box-shadow:inset 0 1px 2px rgba(0,0,0,0.1);-moz-box-shadow:inset 0 1px 2px rgba(0,0,0,0.1);box-shadow:inset 0 1px 2px rgba(0,0,0,0.1)}input[type=checkbox]:checked:before{float:left;display:inline-block;vertical-align:middle;width:16px;line-height:14px;font-family:'Font Awesome 5 Free';text-rendering:auto;-webkit-font-smoothing:antialiased;-moz-osx-font-smoothing:grayscale}input[type=checkbox]:checked:before{content:'\f00c';margin-bottom:-1px;color:#13aff0;font-weight:600}select{width:100%;height:2.25em;min-height:auto;border:1px solid #ddd;background-color:white;padding:0 15px;margin:0}form label{margin-bottom:3px}button[type="submit"]{display:inline-block;font-family:inherit;background-color:#13aff0;color:#fff;font-size:12px;font-weight:600;text-transform:uppercase;margin:0;padding:14px 20px;border:0;text-align:center;letter-spacing:0.1em;line-height:1}button::-moz-focus-inner{padding:0;border:0}#top-bar-wrap{position:relative;background-color:#fff;font-size:12px;border-bottom:1px solid #f1f1f1;z-index:101}#top-bar{padding:8px 0}#top-bar-inner{position:relative}.top-bar-left{float:left}.top-bar-right{float:right}@media only screen and (max-width:767px){#top-bar{padding:20px 0}.top-bar-right{float:none;text-align:center}}@media screen and (max-width:782px){#top-bar-wrap{z-index:100}}@media only screen and (max-width:767px){#top-bar-content{float:none;text-align:center}}#top-bar-social ul{margin:0;padding:0;list-style:none}#top-bar-social li{float:left}#top-bar-social li a{display:block;float:left;font-size:14px;color:#bbb;padding:0 6px}#top-bar-social.top-bar-left li:first-child a{padding-left:0}#top-bar-social.top-bar-left{position:absolute;left:0;top:50%;height:20px;line-height:20px;margin-top:-10px}@media only screen and (max-width:767px){#top-bar-social{text-align:center}#top-bar-social.top-bar-left{position:inherit;left:auto;right:auto;float:none;height:auto;line-height:1.5em;margin-top:0}#top-bar-social li{float:none;display:inline-block}}#site-header{position:relative;width:100%;background-color:#fff;border-bottom:1px solid #f1f1f1;z-index:100}#site-header-inner{position:relative;height:100%}#site-logo{float:left;height:100%;display:table}#site-logo #site-logo-inner{display:table-cell;vertical-align:middle;height:74px}#site-logo #site-logo-inner a{background-color:transparent!important}#site-logo a.site-logo-text{font-size:24px;margin:0}@media only screen and (max-width:767px){#site-logo{margin-top:0px!important;margin-bottom:0px!important}}#site-navigation-wrap{float:right;position:relative;right:-15px}#site-navigation-wrap .dropdown-menu{list-style:none;margin:0;padding:0}#site-navigation-wrap .dropdown-menu>li{float:left;position:relative}#site-navigation-wrap .dropdown-menu>li>a{display:block;font-size:13px;line-height:74px;color:#555;padding:0 15px;letter-spacing:0.6px}#site-navigation-wrap .dropdown-menu>li>a.site-search-toggle{letter-spacing:0}#site-navigation-wrap .dropdown-menu>li>a .nav-arrow{padding-left:6px;line-height:1}.sf-menu,.sf-menu *{margin:0;padding:0;list-style:none}.sf-menu li.menu-item{position:relative;white-space:nowrap;white-space:normal}.sf-menu ul.sub-menu{position:absolute;display:none;top:100%;left:0;z-index:9999}.sf-menu>li{float:left}.sf-menu a.menu-link{display:block;position:relative;zoom:1}.sf-menu ul.sub-menu ul{top:0;left:100%}.dropdown-menu,.dropdown-menu *{margin:0;padding:0;list-style:none}.dropdown-menu .sub-menu{display:none;position:absolute;top:100%;left:0;background-color:#fff;border-top:3px solid #13aff0;min-width:180px;line-height:1;text-align:left;z-index:999;-webkit-box-shadow:0 2px 6px rgba(0,0,0,0.1);-moz-box-shadow:0 2px 6px rgba(0,0,0,0.1);box-shadow:0 2px 6px rgba(0,0,0,0.1)}.dropdown-menu li .sub-menu li.menu-item{display:block;float:none}.dropdown-menu ul .sub-menu{top:0;left:100%}.dropdown-menu ul li.menu-item{display:block;border-bottom:1px solid #f1f1f1}.dropdown-menu ul li.menu-item:last-child{border-bottom:0}.dropdown-menu ul li a.menu-link{display:block;position:relative;float:none;font-size:12px;font-weight:400;line-height:1.2em;letter-spacing:0.6px;padding:12px 15px;text-transform:capitalize}.dropdown-menu ul li a.menu-link .nav-arrow{position:absolute;top:50%;right:15px;margin-top:-6.5px;padding:0}.oceanwp-mobile-menu-icon{display:none;position:relative}.oceanwp-mobile-menu-icon.mobile-right{float:right}.oceanwp-mobile-menu-icon a{font-size:13px;line-height:74px;color:#555;padding-left:15px;letter-spacing:0.6px}.oceanwp-mobile-menu-icon a:first-child{padding-left:0}.oceanwp-mobile-menu-icon a.mobile-menu .oceanwp-text,.oceanwp-mobile-menu-icon a.mobile-menu .oceanwp-close-text{padding-left:6px}.oceanwp-mobile-menu-icon a.mobile-menu .oceanwp-close-text{display:none}#searchform-dropdown{position:absolute;right:0;background-color:#fff;border-top:3px solid #13aff0;top:100%;padding:15px;width:260px;-webkit-box-shadow:0 2px 7px rgba(0,0,0,0.1);-moz-box-shadow:0 2px 7px rgba(0,0,0,0.1);box-shadow:0 2px 7px rgba(0,0,0,0.1);visibility:hidden;-moz-opacity:0;-webkit-opacity:0;opacity:0;z-index:10000}#searchform-dropdown input{display:block;background-color:transparent;-webkit-border-radius:0;-moz-border-radius:0;-ms-border-radius:0;border-radius:0;margin:0}#mobile-dropdown{display:none;position:absolute;top:100%;left:0;width:100%;background-color:#fff;max-height:400px;overflow-y:auto;-webkit-box-shadow:0 2px 6px rgba(0,0,0,0.1);-moz-box-shadow:0 2px 6px rgba(0,0,0,0.1);box-shadow:0 2px 6px rgba(0,0,0,0.1)}#mobile-dropdown ul{margin:0;list-style:none}#mobile-dropdown ul li{border-bottom:1px solid rgba(0,0,0,0.035)}#mobile-dropdown ul li a{display:block;position:relative;padding:12px 40px;text-align:left}#mobile-dropdown ul li ul{display:none;border-top:1px solid rgba(0,0,0,0.035);margin-left:0;background-color:rgba(0,0,0,0.02)}#mobile-dropdown ul li.search-toggle-li{display:none}#mobile-dropdown #mobile-menu-search{display:block;padding:20px 40px}#mobile-dropdown #mobile-menu-search form{position:relative}#mobile-dropdown #mobile-menu-search form input{padding:6px 45px 6px 12px!important;margin-top:0!important;-webkit-box-sizing:inherit;-moz-box-sizing:inherit;box-sizing:inherit}#mobile-dropdown #mobile-menu-search form button{display:block;position:absolute;right:10px;height:30px;line-height:30px;width:30px;padding:0;text-align:center;top:50%;margin-top:-15px;background-color:transparent!important;color:#555;border:0}.single .entry-title{font-size:34px;padding:0 0 20px;margin:0 0 15px;border-bottom:1px solid #f1f1f1;letter-spacing:0.6px}@media only screen and (max-width:480px){.single-post .entry-title{font-size:26px}}.single .entry-content{margin-bottom:20px}.widget-area{font-size:13px}.sidebar-box{margin-bottom:40px}.sidebar-box ul{margin:0;padding:0;list-style:none}.widget-title{display:block;line-height:1;font-size:13px;font-weight:400;color:#333;border-width:0 0 0 3px;border-style:solid;border-color:#13aff0;letter-spacing:1px;padding-left:15px;margin:0 0 20px;text-transform:capitalize}#respond #cancel-comment-reply-link{font-size:10px;color:#929292;float:right;border:2px solid #f1f1f1;padding:3px 10px;-webkit-border-radius:3px;-moz-border-radius:3px;-ms-border-radius:3px;border-radius:3px;text-transform:uppercase;letter-spacing:0.1em}#scroll-top{display:none;position:fixed;right:20px;bottom:20px;width:40px;height:40px;line-height:40px;background-color:rgba(0,0,0,0.4);color:#fff;font-size:18px;-webkit-border-radius:2px;-moz-border-radius:2px;-ms-border-radius:2px;border-radius:2px;text-align:center;z-index:100;-webkit-box-sizing:content-box;-moz-box-sizing:content-box;box-sizing:content-box}#scroll-top>span{line-height:inherit;vertical-align:top}@media only screen and (max-width:480px){#scroll-top{right:10px;bottom:10px;width:26px;height:26px;line-height:24px;font-size:14px}}#mobile-menu-search{display:none}@media only screen and (max-width:959px){body.default-breakpoint #site-navigation-wrap{display:none}body.default-breakpoint .oceanwp-mobile-menu-icon{display:block}}</style><link rel="preload" href="https://web.archive.org/web/20210422144856/https://www.electricalclassroom.com/wp-content/cache/min/1/6bef0d71236b876ebbd3ae64e42bebd3.css" data-rocket-async="style" as="style" onload="this.onload=null;this.rel='stylesheet'" media="all" data-minify="1"/> <meta name="description" content="What is kA rating, significance of kA rating, MCCB and MCB"/> <meta name="robots" content="follow, index, max-snippet:-1, max-video-preview:-1, max-image-preview:large"/> <link rel="canonical" href="https://web.archive.org/web/20210422144856/https://www.electricalclassroom.com/what-is-ka-rating-of-mcb-mccb/"/> <meta property="og:locale" content="en_US"/> <meta property="og:type" content="article"/> <meta property="og:title" content="What is kA rating of MCB and MCCB?"/> <meta property="og:description" content="What is kA rating, significance of kA rating, MCCB and MCB"/> <meta property="og:url" content="https://web.archive.org/web/20210422144856/https://www.electricalclassroom.com/what-is-ka-rating-of-mcb-mccb/"/> <meta property="og:site_name" content="Electrical Classroom"/> <meta property="article:publisher" content="https://www.facebook.com/electricalclassroom/"/> <meta property="article:tag" content="MCB"/> <meta property="article:section" content="Q&amp;A"/> <meta property="og:updated_time" content="2021-04-12T15:17:16+00:00"/> <meta property="og:image" content="https://web.archive.org/web/20210422144856im_/https://www.electricalclassroom.com/wp-content/uploads/2020/02/circuit-breakers-marking-2.png"/> <meta property="og:image:secure_url" content="https://www.electricalclassroom.com/wp-content/uploads/2020/02/circuit-breakers-marking-2.png"/> <meta property="og:image:width" content="560"/> <meta property="og:image:height" content="473"/> <meta property="og:image:alt" content="kA rating of MCB and MCCB"/> <meta property="og:image:type" content="image/png"/> <meta name="twitter:card" content="summary"/> <meta name="twitter:title" content="What is kA rating of MCB and MCCB?"/> <meta name="twitter:description" content="What is kA rating, significance of kA rating, MCCB and MCB"/> <meta name="twitter:site" content="@Electricclassro"/> <meta name="twitter:creator" content="@Electricclassro"/> <meta name="twitter:image" content="https://web.archive.org/web/20210422144856im_/https://www.electricalclassroom.com/wp-content/uploads/2020/02/circuit-breakers-marking-2.png"/> <script type="application/ld+json" class="rank-math-schema">{"@context":"https://web.archive.org/web/20210422144856/https://schema.org","@graph":[{"@type":["Organization"],"@id":"https://web.archive.org/web/20210422144856/https://www.electricalclassroom.com/#organization","name":"Electrical Classroom","url":"https://web.archive.org/web/20210422144856/https://www.electricalclassroom.com","logo":{"@type":"ImageObject","@id":"https://web.archive.org/web/20210422144856/https://www.electricalclassroom.com/#logo","url":"https://web.archive.org/web/20210422144856/https://www.electricalclassroom.com/wp-content/uploads/2018/11/0-UHD-tiny-ELECTRICAL-CLASSROOM.png","caption":"Electrical Classroom","inLanguage":"en-US","width":"250","height":"101"},"openingHours":["Monday,Tuesday,Wednesday,Thursday,Friday,Saturday,Sunday 09:00-17:00"]},{"@type":"WebSite","@id":"https://web.archive.org/web/20210422144856/https://www.electricalclassroom.com/#website","url":"https://web.archive.org/web/20210422144856/https://www.electricalclassroom.com","name":"Electrical Classroom","publisher":{"@id":"https://web.archive.org/web/20210422144856/https://www.electricalclassroom.com/#organization"},"inLanguage":"en-US"},{"@type":"ImageObject","@id":"https://web.archive.org/web/20210422144856/https://www.electricalclassroom.com/wp-content/uploads/2020/02/circuit-breakers-marking-2.png","url":"https://web.archive.org/web/20210422144856/https://www.electricalclassroom.com/wp-content/uploads/2020/02/circuit-breakers-marking-2.png","width":"560","height":"473","caption":"kA rating of MCB and MCCB","inLanguage":"en-US"},{"@type":"BreadcrumbList","@id":"https://web.archive.org/web/20210422144856/https://www.electricalclassroom.com/what-is-ka-rating-of-mcb-mccb/#breadcrumb","itemListElement":[{"@type":"ListItem","position":"1","item":{"@id":"https://web.archive.org/web/20210422144856/https://www.electricalclassroom.com","name":"Home"}},{"@type":"ListItem","position":"2","item":{"@id":"https://web.archive.org/web/20210422144856/https://www.electricalclassroom.com/category/qa/","name":"Q&amp;A"}},{"@type":"ListItem","position":"3","item":{"@id":"https://web.archive.org/web/20210422144856/https://www.electricalclassroom.com/what-is-ka-rating-of-mcb-mccb/","name":"What is kA rating of MCB and MCCB?"}}]},{"@type":"Person","@id":"https://web.archive.org/web/20210422144856/https://www.electricalclassroom.com/author/electrical_classroom/","name":"Electrical Classroom","image":{"@type":"ImageObject","@id":"https://web.archive.org/web/20210422144856/https://secure.gravatar.com/avatar/7a62eda4e9c543182040c86775fb32a1?s=96&amp;d=mm&amp;r=g","url":"https://web.archive.org/web/20210422144856/https://secure.gravatar.com/avatar/7a62eda4e9c543182040c86775fb32a1?s=96&amp;d=mm&amp;r=g","caption":"Electrical Classroom","inLanguage":"en-US"},"worksFor":{"@id":"https://web.archive.org/web/20210422144856/https://www.electricalclassroom.com/#organization"}},{"@type":"WebPage","@id":"https://web.archive.org/web/20210422144856/https://www.electricalclassroom.com/what-is-ka-rating-of-mcb-mccb/#webpage","url":"https://web.archive.org/web/20210422144856/https://www.electricalclassroom.com/what-is-ka-rating-of-mcb-mccb/","name":"What is kA rating of MCB and MCCB?","datePublished":"2020-02-11T16:20:16+00:00","dateModified":"2021-04-12T15:17:16+00:00","author":{"@id":"https://web.archive.org/web/20210422144856/https://www.electricalclassroom.com/author/electrical_classroom/"},"isPartOf":{"@id":"https://web.archive.org/web/20210422144856/https://www.electricalclassroom.com/#website"},"primaryImageOfPage":{"@id":"https://web.archive.org/web/20210422144856/https://www.electricalclassroom.com/wp-content/uploads/2020/02/circuit-breakers-marking-2.png"},"inLanguage":"en-US","breadcrumb":{"@id":"https://web.archive.org/web/20210422144856/https://www.electricalclassroom.com/what-is-ka-rating-of-mcb-mccb/#breadcrumb"}},{"@type":"Article","headline":"What is kA rating of MCB and MCCB?","keywords":"ka rating, short circuit capacity, ultimate current withstand capacity","datePublished":"2020-02-11T16:20:16+00:00","dateModified":"2021-04-12T15:17:16+00:00","author":{"@type":"Person","name":"Electrical Classroom"},"publisher":{"@id":"https://web.archive.org/web/20210422144856/https://www.electricalclassroom.com/#organization"},"description":"What is kA rating, significance of kA rating, MCCB and MCB","name":"What is kA rating of MCB and MCCB?","@id":"https://web.archive.org/web/20210422144856/https://www.electricalclassroom.com/what-is-ka-rating-of-mcb-mccb/#richSnippet","isPartOf":{"@id":"https://web.archive.org/web/20210422144856/https://www.electricalclassroom.com/what-is-ka-rating-of-mcb-mccb/#webpage"},"image":{"@id":"https://web.archive.org/web/20210422144856/https://www.electricalclassroom.com/wp-content/uploads/2020/02/circuit-breakers-marking-2.png"},"inLanguage":"en-US","mainEntityOfPage":{"@id":"https://web.archive.org/web/20210422144856/https://www.electricalclassroom.com/what-is-ka-rating-of-mcb-mccb/#webpage"}}]}</script> <link rel="dns-prefetch" href="//web.archive.org/web/20210422144856/https://www.googletagmanager.com/"/> <link href="https://web.archive.org/web/20210422144856/https://fonts.gstatic.com/" crossorigin="" rel="preconnect"/> <link rel="alternate" type="application/rss+xml" title="Electrical Classroom » Feed" href="https://web.archive.org/web/20210422144856/https://www.electricalclassroom.com/feed/"/> <link rel="alternate" type="application/rss+xml" title="Electrical Classroom » Comments Feed" href="https://web.archive.org/web/20210422144856/https://www.electricalclassroom.com/comments/feed/"/> <link rel="alternate" type="application/rss+xml" title="Electrical Classroom » What is kA rating of MCB and MCCB? Comments Feed" href="https://web.archive.org/web/20210422144856/https://www.electricalclassroom.com/what-is-ka-rating-of-mcb-mccb/feed/"/> <style type="text/css"> img.wp-smiley, img.emoji { display: inline !important; border: none !important; box-shadow: none !important; height: 1em !important; width: 1em !important; margin: 0 .07em !important; vertical-align: -0.1em !important; background: none !important; padding: 0 !important; } </style> <link rel="preload" href="https://web.archive.org/web/20210422144856/https://fonts.googleapis.com/css?family=Roboto%3A100%2C100italic%2C200%2C200italic%2C300%2C300italic%2C400%2C400italic%2C500%2C500italic%2C600%2C600italic%2C700%2C700italic%2C800%2C800italic%2C900%2C900italic%7CRoboto+Slab%3A100%2C100italic%2C200%2C200italic%2C300%2C300italic%2C400%2C400italic%2C500%2C500italic%2C600%2C600italic%2C700%2C700italic%2C800%2C800italic%2C900%2C900italic%7CAmita%3A100%2C100italic%2C200%2C200italic%2C300%2C300italic%2C400%2C400italic%2C500%2C500italic%2C600%2C600italic%2C700%2C700italic%2C800%2C800italic%2C900%2C900italic&amp;ver=5.7.1&amp;display=swap" data-rocket-async="style" as="style" onload="this.onload=null;this.rel='stylesheet'" type="text/css" media="all"/> <script type="text/javascript" src="https://web.archive.org/web/20210422144856js_/https://www.electricalclassroom.com/wp-includes/js/jquery/jquery.min.js?ver=3.5.1" id="jquery-core-js"></script> <script data-rocketlazyloadscript="data:text/javascript;base64,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" type="text/javascript" id="cookie-law-info-js-extra"></script> <script data-rocketlazyloadscript="https://www.electricalclassroom.com/wp-content/plugins/cookie-law-info/public/js/cookie-law-info-public.js?ver=2.0.1" type="text/javascript" id="cookie-law-info-js"></script> <script data-rocketlazyloadscript="https://www.electricalclassroom.com/wp-content/cache/busting/1/gtm-f21071ef1bb0e339d099f3c47243142e.js" data-no-minify="1" type="text/javascript" id="google_gtagjs-js" async=""></script> <script data-rocketlazyloadscript="data:text/javascript;base64,CndpbmRvdy5kYXRhTGF5ZXIgPSB3aW5kb3cuZGF0YUxheWVyIHx8IFtdO2Z1bmN0aW9uIGd0YWcoKXtkYXRhTGF5ZXIucHVzaChhcmd1bWVudHMpO30KZ3RhZygianMiLCBuZXcgRGF0ZSgpKTsKZ3RhZygic2V0IiwgImRldmVsb3Blcl9pZC5kWlROaU1UIiwgdHJ1ZSk7Cmd0YWcoImNvbmZpZyIsICJVQS01NzUyNTU1OC0xIiwgeyJhbm9ueW1pemVfaXAiOnRydWUsIm9wdGltaXplX2lkIjoiT1BULVc3MjVWQ1gifSk7Cg==" type="text/javascript" id="google_gtagjs-js-after"></script> <link rel="https://api.w.org/" href="https://www.electricalclassroom.com/wp-json/"/><link rel="alternate" type="application/json" href="https://web.archive.org/web/20210422144856/https://www.electricalclassroom.com/wp-json/wp/v2/posts/3555"/><link rel="EditURI" type="application/rsd+xml" title="RSD" href="https://www.electricalclassroom.com/xmlrpc.php?rsd"/> <link rel="wlwmanifest" type="application/wlwmanifest+xml" href="https://www.electricalclassroom.com/wp-includes/wlwmanifest.xml"/> <meta name="generator" content="WordPress 5.7.1"/> <link rel="shortlink" href="https://web.archive.org/web/20210422144856/https://www.electricalclassroom.com/?p=3555"/> <link rel="alternate" type="application/json+oembed" href="https://web.archive.org/web/20210422144856/https://www.electricalclassroom.com/wp-json/oembed/1.0/embed?url=https%3A%2F%2Fwww.electricalclassroom.com%2Fwhat-is-ka-rating-of-mcb-mccb%2F"/> <link rel="alternate" type="text/xml+oembed" href="https://web.archive.org/web/20210422144856/https://www.electricalclassroom.com/wp-json/oembed/1.0/embed?url=https%3A%2F%2Fwww.electricalclassroom.com%2Fwhat-is-ka-rating-of-mcb-mccb%2F&amp;format=xml"/> <meta name="yandex-verification" content="3a1fd54e1f9c46a5"/> <script data-rocketlazyloadscript="https://pagead2.googlesyndication.com/pagead/js/adsbygoogle.js" data-ad-client="ca-pub-4567036280313464" async=""></script> <script type="text/javascript">var ezouid = "1";</script><base href="https://web.archive.org/web/20210422144856/https://www.electricalclassroom.com/what-is-ka-rating-of-mcb-mccb/"><script type="text/javascript"> var ezoTemplate = 'old_site_gc'; if(typeof ezouid == 'undefined') { var ezouid = 'none'; } var ezoFormfactor = '1'; var ezo_elements_to_check = Array(); </script> <script data-ezscrex="false" type="text/javascript"> var soc_app_id = '0'; var did = 142070; var ezdomain = 'electricalclassroom.com'; var ezoicSearchable = 1; </script> <script data-ezscrex="false" type="text/javascript" data-cfasync="false">var _ezaq = {"ad_cache_level":0,"ad_lazyload_version":0,"ad_load_version":0,"city":"Ashburn","country":"US","days_since_last_visit":-1,"domain_id":142070,"engaged_time_visit":0,"ezcache_level":1,"ezcache_skip_code":7,"form_factor_id":1,"framework_id":1,"is_return_visitor":false,"is_sitespeed":0,"last_page_load":"","last_pageview_id":"","lt_cache_level":0,"metro_code":511,"page_ad_positions":"","page_view_count":0,"page_view_id":"ff5d9178-8581-4da2-5f78-8e7d29be3395","position_selection_id":0,"postal_code":"20149","pv_event_count":0,"response_size_orig":120206,"response_time_orig":94,"serverid":"34.224.87.208:7276","state":"VA","t_epoch":1619102936,"template_id":126,"time_on_site_visit":0,"url":"https://web.archive.org/web/20210422144856/https://www.electricalclassroom.com/what-is-ka-rating-of-mcb-mccb/","user_id":0,"word_count":956,"worst_bad_word_level":0};var _ezExtraQueries = "&ez_orig=1";</script> <script data-ezscrex="false" data-pagespeed-no-defer data-cfasync="false"> function create_ezolpl(pvID, rv) { var d = new Date(); d.setTime(d.getTime() + (365*24*60*60*1000)); var expires = "expires="+d.toUTCString(); __ez.ck.setByCat("ezux_lpl_142070=" + new Date().getTime() + "|" + pvID + "|" + rv + "; " + expires, 3); } function attach_ezolpl(pvID, rv) { if (document.readyState === "complete") { create_ezolpl(pvID, rv); } if(window.attachEvent) { window.attachEvent("onload", create_ezolpl, pvID, rv); } else { if(window.onload) { var curronload = window.onload; var newonload = function(evt) { curronload(evt); create_ezolpl(pvID, rv); }; window.onload = newonload; } else { window.onload = create_ezolpl.bind(null, pvID, rv); } } } __ez.queue.addFunc("attach_ezolpl", "attach_ezolpl", ["ff5d9178-8581-4da2-5f78-8e7d29be3395", "false"], false, ['/detroitchicago/boise.js'], true, false, false, false); </script></head><body data-rsssl="1" class="post-template-default single single-post postid-3555 single-format-standard wp-embed-responsive oceanwp-theme dropdown-mobile boxed-layout wrap-boxshadow default-breakpoint has-sidebar content-right-sidebar post-in-category-qa has-topbar has-breadcrumbs elementor-default elementor-kit-3838" itemscope="itemscope" itemtype="https://schema.org/Article"><amp-auto-ads type="adsense" data-ad-client="ca-pub-4567036280313464"> </amp-auto-ads> <meta name="generator" content="Site Kit by Google 1.30.0"/> <style></style> <script data-rocketlazyloadscript="//pagead2.googlesyndication.com/pagead/js/adsbygoogle.js" async=""></script><script>(adsbygoogle = window.adsbygoogle || []).push({"google_ad_client":"ca-pub-4567036280313464","enable_page_level_ads":true,"tag_partner":"site_kit"});</script> <script data-rocketlazyloadscript="data:text/javascript;base64,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"></script> <link rel="icon" href="https://web.archive.org/web/20210422144856im_/https://www.electricalclassroom.com/wp-content/uploads/2018/11/cropped-0-UHD-logo-32x32.png" sizes="32x32"/> <link rel="icon" href="https://web.archive.org/web/20210422144856im_/https://www.electricalclassroom.com/wp-content/uploads/2018/11/cropped-0-UHD-logo-192x192.png" sizes="192x192"/> <link rel="apple-touch-icon" href="https://web.archive.org/web/20210422144856im_/https://www.electricalclassroom.com/wp-content/uploads/2018/11/cropped-0-UHD-logo-180x180.png"/> <meta name="msapplication-TileImage" content="https://www.electricalclassroom.com/wp-content/uploads/2018/11/cropped-0-UHD-logo-270x270.png"/> <style type="text/css" id="wp-custom-css"> input[type=text],input[type=float],input[type=number]{background-color:Khaki;padding:5px;border:1px solid #ccc;border-radius:4px;box-sizing:border-box;resize:vertical;width:120px}input{background-color:Khaki;padding:5px;border:1px solid #ccc;border-radius:4px;box-sizing:border-box;resize:vertical;width:120px}input[type=text]:disabled,input[type=float]:disabled,input[type=number]:disabled{background-color:#dddddd;padding:5px;border:1px solid #ccc;border-radius:4px;box-sizing:border-box;resize:vertical;width:180px}select{background-color:pink;padding:5px;border:none;border-radius:4px;width:auto;height:30px;margin:4px}input[type=button]{background-color:#B0E0E6;font-weight:bold;font-size:14px;padding:12px 12px;border:none;border-radius:4px;cursor:pointer}button{font-weight:bold;font-size:14px } </style> <style type="text/css"> /* General CSS */a:hover,a.light:hover,.theme-heading .text::before,.theme-heading .text::after,#top-bar-content >a:hover,#top-bar-social li.oceanwp-email a:hover,#site-navigation-wrap .dropdown-menu >li >a:hover,#site-header.medium-header #medium-searchform button:hover,.oceanwp-mobile-menu-icon a:hover,.blog-entry.post .blog-entry-header .entry-title a:hover,.blog-entry.post .blog-entry-readmore a:hover,.blog-entry.thumbnail-entry .blog-entry-category a,ul.meta li a:hover,.dropcap,.single nav.post-navigation .nav-links .title,body .related-post-title a:hover,body #wp-calendar caption,body .contact-info-widget.default i,body .contact-info-widget.big-icons i,body .custom-links-widget .oceanwp-custom-links li a:hover,body .custom-links-widget .oceanwp-custom-links li a:hover:before,body .posts-thumbnails-widget li a:hover,body .social-widget li.oceanwp-email a:hover,.comment-author .comment-meta .comment-reply-link,#respond #cancel-comment-reply-link:hover,#footer-widgets .footer-box a:hover,#footer-bottom a:hover,#footer-bottom #footer-bottom-menu a:hover,.sidr a:hover,.sidr-class-dropdown-toggle:hover,.sidr-class-menu-item-has-children.active >a,.sidr-class-menu-item-has-children.active >a >.sidr-class-dropdown-toggle,input[type=checkbox]:checked:before{color:#000000}input[type="button"],input[type="reset"],input[type="submit"],button[type="submit"],.button,#site-navigation-wrap .dropdown-menu >li.btn >a >span,.thumbnail:hover i,.post-quote-content,.omw-modal .omw-close-modal,body .contact-info-widget.big-icons li:hover i,body div.wpforms-container-full .wpforms-form input[type=submit],body div.wpforms-container-full .wpforms-form button[type=submit],body div.wpforms-container-full .wpforms-form .wpforms-page-button{background-color:#000000}.widget-title{border-color:#000000}blockquote{border-color:#000000}#searchform-dropdown{border-color:#000000}.dropdown-menu .sub-menu{border-color:#000000}.blog-entry.large-entry .blog-entry-readmore a:hover{border-color:#000000}.oceanwp-newsletter-form-wrap input[type="email"]:focus{border-color:#000000}.social-widget li.oceanwp-email a:hover{border-color:#000000}#respond #cancel-comment-reply-link:hover{border-color:#000000}body .contact-info-widget.big-icons li:hover i{border-color:#000000}#footer-widgets .oceanwp-newsletter-form-wrap input[type="email"]:focus{border-color:#000000}blockquote,.wp-block-quote{border-left-color:#000000}input[type="button"]:hover,input[type="reset"]:hover,input[type="submit"]:hover,button[type="submit"]:hover,input[type="button"]:focus,input[type="reset"]:focus,input[type="submit"]:focus,button[type="submit"]:focus,.button:hover,#site-navigation-wrap .dropdown-menu >li.btn >a:hover >span,.post-quote-author,.omw-modal .omw-close-modal:hover,body div.wpforms-container-full .wpforms-form input[type=submit]:hover,body div.wpforms-container-full .wpforms-form button[type=submit]:hover,body div.wpforms-container-full .wpforms-form .wpforms-page-button:hover{background-color:#ffc0cb}a{color:#1e73be}a:hover{color:#ffc0cb}.boxed-layout #wrap,.boxed-layout .parallax-footer,.boxed-layout .owp-floating-bar{width:1200px}.container{width:1400px}@media only screen and (min-width:960px){.content-area,.content-left-sidebar .content-area{width:70%}}@media only screen and (min-width:960px){.widget-area,.content-left-sidebar .widget-area{width:30%}}.page-header .page-header-title,.page-header.background-image-page-header .page-header-title{color:#000000}.site-breadcrumbs,.background-image-page-header .site-breadcrumbs{color:#000000}.site-breadcrumbs a,.background-image-page-header .site-breadcrumbs a{color:#1e73be}.site-breadcrumbs a:hover,.background-image-page-header .site-breadcrumbs a:hover{color:#ffc0cb}/* Header CSS */#site-logo #site-logo-inner,.oceanwp-social-menu .social-menu-inner,#site-header.full_screen-header .menu-bar-inner,.after-header-content .after-header-content-inner{height:61px}#site-navigation-wrap .dropdown-menu >li >a,.oceanwp-mobile-menu-icon a,.mobile-menu-close,.after-header-content-inner >a{line-height:61px}#site-header.has-header-media .overlay-header-media{background-color:rgba(0,0,0,0.5)}/* Footer Widgets CSS */#footer-widgets,#footer-widgets p,#footer-widgets li a:before,#footer-widgets .contact-info-widget span.oceanwp-contact-title,#footer-widgets .recent-posts-date,#footer-widgets .recent-posts-comments,#footer-widgets .widget-recent-posts-icons li .fa{color:#fcfcfc}#footer-widgets .footer-box a,#footer-widgets a{color:#1e73be}#footer-widgets .footer-box a:hover,#footer-widgets a:hover{color:#ffc0cb}/* Footer Bottom CSS */#footer-bottom,#footer-bottom p{color:#f7f7f7}#footer-bottom a,#footer-bottom #footer-bottom-menu a{color:#1e73be}#footer-bottom a:hover,#footer-bottom #footer-bottom-menu a:hover{color:#ffc0cb}/* Typography CSS */body{font-size:16px;color:#000000}h1,h2,h3,h4,h5,h6,.theme-heading,.widget-title,.oceanwp-widget-recent-posts-title,.comment-reply-title,.entry-title,.sidebar-box .widget-title{color:#000000}h2{color:#000000}h3{color:#000000}h4{color:#000000}#site-logo a.site-logo-text{font-size:25px;text-transform:capitalize}#site-navigation-wrap .dropdown-menu >li >a,#site-header.full_screen-header .fs-dropdown-menu >li >a,#site-header.top-header #site-navigation-wrap .dropdown-menu >li >a,#site-header.center-header #site-navigation-wrap .dropdown-menu >li >a,#site-header.medium-header #site-navigation-wrap .dropdown-menu >li >a,.oceanwp-mobile-menu-icon a{font-size:14px}.dropdown-menu ul li a.menu-link,#site-header.full_screen-header .fs-dropdown-menu ul.sub-menu li a{font-size:14px}.blog-entry.post .blog-entry-header .entry-title a{color:#000000}.single-post .entry-title{color:#000000}.sidebar-box .widget-title{font-size:15px;color:#000000} </style><style> .ai-viewports {--ai: 1;} .ai-viewport-3 { display: none !important;} .ai-viewport-2 { display: none !important;} .ai-viewport-1 { display: inherit !important;} .ai-viewport-0 { display: none !important;} @media (min-width: 768px) and (max-width: 979px) { .ai-viewport-1 { display: none !important;} .ai-viewport-2 { display: inherit !important;} } @media (max-width: 767px) { .ai-viewport-1 { display: none !important;} .ai-viewport-3 { display: inherit !important;} } </style> <noscript><style id="rocket-lazyload-nojs-css">.rll-youtube-player, [data-lazy-src]{display:none !important;}</style></noscript><script> /*! loadCSS rel=preload polyfill. [c]2017 Filament Group, Inc. MIT License */ (function(w){"use strict";if(!w.loadCSS){w.loadCSS=function(){}} var rp=loadCSS.relpreload={};rp.support=(function(){var ret;try{ret=w.document.createElement("link").relList.supports("preload")}catch(e){ret=!1} return function(){return ret}})();rp.bindMediaToggle=function(link){var finalMedia=link.media||"all";function enableStylesheet(){link.media=finalMedia} if(link.addEventListener){link.addEventListener("load",enableStylesheet)}else if(link.attachEvent){link.attachEvent("onload",enableStylesheet)} setTimeout(function(){link.rel="stylesheet";link.media="only x"});setTimeout(enableStylesheet,3000)};rp.poly=function(){if(rp.support()){return} var links=w.document.getElementsByTagName("link");for(var i=0;i<links.length;i++){var link=links[i];if(link.rel==="preload"&&link.getAttribute("as")==="style"&&!link.getAttribute("data-loadcss")){link.setAttribute("data-loadcss",!0);rp.bindMediaToggle(link)}}};if(!rp.support()){rp.poly();var run=w.setInterval(rp.poly,500);if(w.addEventListener){w.addEventListener("load",function(){rp.poly();w.clearInterval(run)})}else if(w.attachEvent){w.attachEvent("onload",function(){rp.poly();w.clearInterval(run)})}} if(typeof exports!=="undefined"){exports.loadCSS=loadCSS} else{w.loadCSS=loadCSS}}(typeof global!=="undefined"?global:this)) </script> <noscript> <iframe src="https://web.archive.org/web/20210422144856if_/https://www.googletagmanager.com/ns.html?id=GTM-KVBS5ZV" height="0" width="0" style="display:none;visibility:hidden"></iframe> </noscript> <div id="outer-wrap" class="site clr"> <a class="skip-link screen-reader-text" href="#main">Skip to content</a> <div id="wrap" class="clr"> <div id="top-bar-wrap" class="clr"> <div id="top-bar" class="clr container"> <div id="top-bar-inner" class="clr"> <div id="top-bar-content" class="clr has-content top-bar-right"> <span class="topbar-content"> <a href="/web/20210422144856/https://www.electricalclassroom.com/sitemap/">Sitemap</a> <a href="/web/20210422144856/https://www.electricalclassroom.com/privacy-policy/">Privacy Policy</a> </span> </div> <div id="top-bar-social" class="clr top-bar-left"> <ul class="clr" aria-label="Social links"> <li class="oceanwp-twitter"><a href="https://web.archive.org/web/20210422144856/https://twitter.com/electricclassro" aria-label="Twitter (opens in a new tab)" target="_blank" rel="noopener noreferrer"><span class="fab fa-twitter" aria-hidden="true"></span></a></li><li class="oceanwp-facebook"><a href="https://web.archive.org/web/20210422144856/https://www.facebook.com/electricalclassroom/" aria-label="Facebook (opens in a new tab)" target="_blank" rel="noopener noreferrer"><span class="fab fa-facebook" aria-hidden="true"></span></a></li><li class="oceanwp-pinterest"><a href="https://web.archive.org/web/20210422144856/https://www.pinterest.com/electricalclassroom/" aria-label="Pinterest (opens in a new tab)" target="_blank" rel="noopener noreferrer"><span class="fab fa-pinterest-p" aria-hidden="true"></span></a></li><li class="oceanwp-instagram"><a href="https://web.archive.org/web/20210422144856/https://www.instagram.com/electricalclassroom/" aria-label="Instagram (opens in a new tab)" target="_blank" rel="noopener noreferrer"><span class="fab fa-instagram" aria-hidden="true"></span></a></li><li class="oceanwp-youtube"><a href="https://web.archive.org/web/20210422144856/https://www.youtube.com/channel/UCD9S0T8J39UTm7rq3BGhXzQ" aria-label="Youtube (opens in a new tab)" target="_blank" rel="noopener noreferrer"><span class="fab fa-youtube" aria-hidden="true"></span></a></li> </ul> </div> </div> </div> </div> <header id="site-header" class="minimal-header clr" data-height="61" itemscope="itemscope" itemtype="https://schema.org/WPHeader" role="banner"> <div id="site-header-inner" class="clr container"> <div id="site-logo" class="clr" itemscope="" itemtype="https://schema.org/Brand"> <div id="site-logo-inner" class="clr"> <a href="https://web.archive.org/web/20210422144856/https://www.electricalclassroom.com/" rel="home" class="site-title site-logo-text" style="color:#000000;">Electrical Classroom</a> </div> </div> <div id="site-navigation-wrap" class="clr"> <nav id="site-navigation" class="navigation main-navigation clr" itemscope="itemscope" itemtype="https://schema.org/SiteNavigationElement" role="navigation"> <ul id="menu-primary-menu" class="main-menu dropdown-menu sf-menu"><li id="menu-item-3447" class="menu-item menu-item-type-custom menu-item-object-custom menu-item-has-children dropdown menu-item-3447"><a href="/web/20210422144856/https://www.electricalclassroom.com/category/basics/" class="menu-link"><span class="text-wrap">Basics <span class="nav-arrow fa fa-angle-down"></span></span></a> <ul class="sub-menu"> <li id="menu-item-3450" class="menu-item menu-item-type-custom menu-item-object-custom menu-item-3450"><a href="/web/20210422144856/https://www.electricalclassroom.com/electric-charge/" class="menu-link"><span class="text-wrap">Charge</span></a></li> <li id="menu-item-3448" class="menu-item menu-item-type-custom menu-item-object-custom menu-item-3448"><a href="/web/20210422144856/https://www.electricalclassroom.com/voltage-what-is-voltage-definition-explanation-example/" class="menu-link"><span class="text-wrap">Voltage</span></a></li> <li id="menu-item-3449" class="menu-item menu-item-type-custom menu-item-object-custom menu-item-3449"><a href="/web/20210422144856/https://www.electricalclassroom.com/electric-current-and-current-flow/" class="menu-link"><span class="text-wrap">Current</span></a></li> <li id="menu-item-3453" class="menu-item menu-item-type-custom menu-item-object-custom menu-item-3453"><a href="/web/20210422144856/https://www.electricalclassroom.com/electric-resistance-what-is-resistance/" class="menu-link"><span class="text-wrap">Resistance</span></a></li> <li id="menu-item-3466" class="menu-item menu-item-type-custom menu-item-object-custom menu-item-3466"><a href="/web/20210422144856/https://www.electricalclassroom.com/capacitance-what-is-capacitance-what-is-a-capacitor/" class="menu-link"><span class="text-wrap">Capacitance</span></a></li> <li id="menu-item-3481" class="menu-item menu-item-type-custom menu-item-object-custom menu-item-3481"><a href="/web/20210422144856/https://www.electricalclassroom.com/inductance-what-is-inductance-what-is-an-inductor/" class="menu-link"><span class="text-wrap">Inductance</span></a></li> <li id="menu-item-3482" class="menu-item menu-item-type-custom menu-item-object-custom menu-item-3482"><a href="/web/20210422144856/https://www.electricalclassroom.com/conductance-what-is-conductance/" class="menu-link"><span class="text-wrap">Conductance</span></a></li> <li id="menu-item-3452" class="menu-item menu-item-type-custom menu-item-object-custom menu-item-3452"><a href="/web/20210422144856/https://www.electricalclassroom.com/what-is-electric-power/" class="menu-link"><span class="text-wrap">Power</span></a></li> <li id="menu-item-3451" class="menu-item menu-item-type-custom menu-item-object-custom menu-item-3451"><a href="/web/20210422144856/https://www.electricalclassroom.com/what-is-energy/" class="menu-link"><span class="text-wrap">Energy</span></a></li> <li id="menu-item-5944" class="menu-item menu-item-type-post_type menu-item-object-post menu-item-5944"><a href="https://web.archive.org/web/20210422144856/https://www.electricalclassroom.com/electromagnetic-induction/" class="menu-link"><span class="text-wrap">Electromagnetic Induction</span></a></li> <li id="menu-item-3501" class="menu-item menu-item-type-custom menu-item-object-custom menu-item-has-children dropdown menu-item-3501"><a href="#" class="menu-link"><span class="text-wrap">AC Basics<span class="nav-arrow fa fa-angle-right"></span></span></a> <ul class="sub-menu"> <li id="menu-item-3502" class="menu-item menu-item-type-custom menu-item-object-custom menu-item-3502"><a href="/web/20210422144856/https://www.electricalclassroom.com/alternating-current-basics/" class="menu-link"><span class="text-wrap">AC Basics</span></a></li> <li id="menu-item-3503" class="menu-item menu-item-type-custom menu-item-object-custom menu-item-3503"><a href="/web/20210422144856/https://www.electricalclassroom.com/real-reactive-complex-apparent-power/" class="menu-link"><span class="text-wrap">Real Power</span></a></li> <li id="menu-item-3504" class="menu-item menu-item-type-custom menu-item-object-custom menu-item-3504"><a href="/web/20210422144856/https://www.electricalclassroom.com/real-reactive-complex-apparent-power/#Reactive-power" class="menu-link"><span class="text-wrap">Reactive Power</span></a></li> <li id="menu-item-3505" class="menu-item menu-item-type-custom menu-item-object-custom menu-item-3505"><a href="/web/20210422144856/https://www.electricalclassroom.com/real-reactive-complex-apparent-power/#Complex-and-apparent-power" class="menu-link"><span class="text-wrap">Complex and apparent Power</span></a></li> </ul> </li></ul> </li><li id="menu-item-473" class="menu-item menu-item-type-taxonomy menu-item-object-category menu-item-has-children dropdown menu-item-473"><a href="https://web.archive.org/web/20210422144856/https://www.electricalclassroom.com/category/circuit-theory/" class="menu-link"><span class="text-wrap">Circuit Theory <span class="nav-arrow fa fa-angle-down"></span></span></a> <ul class="sub-menu"> <li id="menu-item-4125" class="menu-item menu-item-type-custom menu-item-object-custom menu-item-4125"><a href="/web/20210422144856/https://www.electricalclassroom.com/what-is-an-electric-circuit/" class="menu-link"><span class="text-wrap">Electric Circuit</span></a></li> <li id="menu-item-4126" class="menu-item menu-item-type-custom menu-item-object-custom menu-item-4126"><a href="/web/20210422144856/https://www.electricalclassroom.com/series-and-parallel-circuits/" class="menu-link"><span class="text-wrap">Series and Parallel Connections</span></a></li> <li id="menu-item-5927" class="menu-item menu-item-type-post_type menu-item-object-post menu-item-5927"><a href="https://web.archive.org/web/20210422144856/https://www.electricalclassroom.com/faradays-law-of-induction/" class="menu-link"><span class="text-wrap">Faraday’s law</span></a></li> <li id="menu-item-5897" class="menu-item menu-item-type-post_type menu-item-object-post menu-item-5897"><a href="https://web.archive.org/web/20210422144856/https://www.electricalclassroom.com/lenzs-law-equations-examples-problems/" class="menu-link"><span class="text-wrap">Lenz’s law</span></a></li> <li id="menu-item-4127" class="menu-item menu-item-type-custom menu-item-object-custom menu-item-4127"><a href="/web/20210422144856/https://www.electricalclassroom.com/ohms-law-relationship-between-current-and-voltage/" class="menu-link"><span class="text-wrap">Ohm’s Law</span></a></li> <li id="menu-item-4128" class="menu-item menu-item-type-custom menu-item-object-custom menu-item-4128"><a href="/web/20210422144856/https://www.electricalclassroom.com/kirchhoff-voltage-and-current-laws/" class="menu-link"><span class="text-wrap">Kirchoff’s Laws</span></a></li> <li id="menu-item-4129" class="menu-item menu-item-type-custom menu-item-object-custom menu-item-4129"><a href="/web/20210422144856/https://www.electricalclassroom.com/voltage-division-rule-potential-divider-circuit/" class="menu-link"><span class="text-wrap">Voltage Division</span></a></li> <li id="menu-item-4130" class="menu-item menu-item-type-custom menu-item-object-custom menu-item-4130"><a href="/web/20210422144856/https://www.electricalclassroom.com/current-division-rule/" class="menu-link"><span class="text-wrap">Current Division</span></a></li> <li id="menu-item-4131" class="menu-item menu-item-type-custom menu-item-object-custom menu-item-4131"><a href="/web/20210422144856/https://www.electricalclassroom.com/thevenins-theorem-explanation-equivalent-circuit-and-solved-examples/" class="menu-link"><span class="text-wrap">Thevenin’s Theorem</span></a></li> <li id="menu-item-4132" class="menu-item menu-item-type-custom menu-item-object-custom menu-item-4132"><a href="/web/20210422144856/https://www.electricalclassroom.com/what-is-nortons-theorem/" class="menu-link"><span class="text-wrap">Norton’s Theorem</span></a></li> <li id="menu-item-4133" class="menu-item menu-item-type-custom menu-item-object-custom menu-item-4133"><a href="/web/20210422144856/https://www.electricalclassroom.com/maximum-power-transfer-theorem/" class="menu-link"><span class="text-wrap">Maximum Power transfer theorem</span></a></li> <li id="menu-item-4134" class="menu-item menu-item-type-custom menu-item-object-custom menu-item-4134"><a href="/web/20210422144856/https://www.electricalclassroom.com/superposition-theorem/" class="menu-link"><span class="text-wrap">Superposition theorem</span></a></li></ul> </li><li id="menu-item-4626" class="menu-item menu-item-type-post_type menu-item-object-post menu-item-has-children dropdown menu-item-4626"><a href="https://web.archive.org/web/20210422144856/https://www.electricalclassroom.com/electric-machines/" class="menu-link"><span class="text-wrap">Machines <span class="nav-arrow fa fa-angle-down"></span></span></a> <ul class="sub-menu"> <li id="menu-item-6149" class="menu-item menu-item-type-post_type menu-item-object-post menu-item-has-children dropdown menu-item-6149"><a href="https://web.archive.org/web/20210422144856/https://www.electricalclassroom.com/electric-transformers/" class="menu-link"><span class="text-wrap">Transformers<span class="nav-arrow fa fa-angle-right"></span></span></a> <ul class="sub-menu"> <li id="menu-item-6151" class="menu-item menu-item-type-post_type menu-item-object-post menu-item-6151"><a href="https://web.archive.org/web/20210422144856/https://www.electricalclassroom.com/transformer-action/" class="menu-link"><span class="text-wrap">Transformer Action</span></a></li> <li id="menu-item-6144" class="menu-item menu-item-type-post_type menu-item-object-post menu-item-6144"><a href="https://web.archive.org/web/20210422144856/https://www.electricalclassroom.com/ideal-transformer/" class="menu-link"><span class="text-wrap">Ideal Transformer</span></a></li> <li id="menu-item-6141" class="menu-item menu-item-type-post_type menu-item-object-post menu-item-6141"><a href="https://web.archive.org/web/20210422144856/https://www.electricalclassroom.com/emf-equation-of-transformers/" class="menu-link"><span class="text-wrap">EMF equation</span></a></li> <li id="menu-item-6142" class="menu-item menu-item-type-post_type menu-item-object-post menu-item-6142"><a href="https://web.archive.org/web/20210422144856/https://www.electricalclassroom.com/equivalent-circuit-of-transformer/" class="menu-link"><span class="text-wrap">Equivalent circuit and Phasor diagram</span></a></li> <li id="menu-item-6136" class="menu-item menu-item-type-post_type menu-item-object-post menu-item-6136"><a href="https://web.archive.org/web/20210422144856/https://www.electricalclassroom.com/voltage-regulation-of-transformers/" class="menu-link"><span class="text-wrap">Voltage regulation</span></a></li> <li id="menu-item-6147" class="menu-item menu-item-type-post_type menu-item-object-post menu-item-6147"><a href="https://web.archive.org/web/20210422144856/https://www.electricalclassroom.com/parts-of-a-transformer/" class="menu-link"><span class="text-wrap">Parts of a transformer</span></a></li> <li id="menu-item-6146" class="menu-item menu-item-type-post_type menu-item-object-post menu-item-6146"><a href="https://web.archive.org/web/20210422144856/https://www.electricalclassroom.com/open-circuit-test-short-circuit-test/" class="menu-link"><span class="text-wrap">Transformer tresting</span></a></li> <li id="menu-item-6155" class="menu-item menu-item-type-post_type menu-item-object-post menu-item-6155"><a href="https://web.archive.org/web/20210422144856/https://www.electricalclassroom.com/transformer-losses-load-no-load-losses/" class="menu-link"><span class="text-wrap">Load losses and No-load losses</span></a></li> <li id="menu-item-6158" class="menu-item menu-item-type-post_type menu-item-object-post menu-item-has-children dropdown menu-item-6158"><a href="https://web.archive.org/web/20210422144856/https://www.electricalclassroom.com/types-of-transformers-types/" class="menu-link"><span class="text-wrap">Types<span class="nav-arrow fa fa-angle-right"></span></span></a> <ul class="sub-menu"> <li id="menu-item-6140" class="menu-item menu-item-type-post_type menu-item-object-post menu-item-6140"><a href="https://web.archive.org/web/20210422144856/https://www.electricalclassroom.com/core-type-and-shell-type-transformers/" class="menu-link"><span class="text-wrap">Core type and shell type transformers</span></a></li> </ul> </li> <li id="menu-item-6139" class="menu-item menu-item-type-post_type menu-item-object-post menu-item-6139"><a href="https://web.archive.org/web/20210422144856/https://www.electricalclassroom.com/magnetization-current-in-a-transformer/" class="menu-link"><span class="text-wrap">Magnetization current</span></a></li> <li id="menu-item-6145" class="menu-item menu-item-type-post_type menu-item-object-post menu-item-6145"><a href="https://web.archive.org/web/20210422144856/https://www.electricalclassroom.com/magnetization-inrush-current/" class="menu-link"><span class="text-wrap">Magnetization inrush</span></a></li> <li id="menu-item-6143" class="menu-item menu-item-type-post_type menu-item-object-post menu-item-6143"><a href="https://web.archive.org/web/20210422144856/https://www.electricalclassroom.com/high-leg-delta-connection/" class="menu-link"><span class="text-wrap">High Leg delta connection</span></a></li> <li id="menu-item-6138" class="menu-item menu-item-type-post_type menu-item-object-post menu-item-6138"><a href="https://web.archive.org/web/20210422144856/https://www.electricalclassroom.com/what-is-buchholz-relay-why-is-it-used/" class="menu-link"><span class="text-wrap">Buchholz relay</span></a></li> <li id="menu-item-6137" class="menu-item menu-item-type-post_type menu-item-object-post menu-item-6137"><a href="https://web.archive.org/web/20210422144856/https://www.electricalclassroom.com/autotransformers-variac-dimmerstat/" class="menu-link"><span class="text-wrap">Autotransformer</span></a></li> <li id="menu-item-6148" class="menu-item menu-item-type-post_type menu-item-object-post menu-item-has-children dropdown menu-item-6148"><a href="https://web.archive.org/web/20210422144856/https://www.electricalclassroom.com/selection-and-sizing-of-transformers/" class="menu-link"><span class="text-wrap">Selection<span class="nav-arrow fa fa-angle-right"></span></span></a> <ul class="sub-menu"> <li id="menu-item-6152" class="menu-item menu-item-type-post_type menu-item-object-post menu-item-6152"><a href="https://web.archive.org/web/20210422144856/https://www.electricalclassroom.com/transformer-faq-interview/" class="menu-link"><span class="text-wrap">Frequently asked questions-1</span></a></li> <li id="menu-item-6153" class="menu-item menu-item-type-post_type menu-item-object-post menu-item-6153"><a href="https://web.archive.org/web/20210422144856/https://www.electricalclassroom.com/transformer-faq-interview-questions-1/" class="menu-link"><span class="text-wrap">Frequently asked questions-2</span></a></li> <li id="menu-item-6150" class="menu-item menu-item-type-post_type menu-item-object-post menu-item-6150"><a href="https://web.archive.org/web/20210422144856/https://www.electricalclassroom.com/transformer-faq-interview-questions-part-3/" class="menu-link"><span class="text-wrap">Frequently asked questions-3</span></a></li> </ul> </li> <li id="menu-item-6156" class="menu-item menu-item-type-post_type menu-item-object-post menu-item-6156"><a href="https://web.archive.org/web/20210422144856/https://www.electricalclassroom.com/transformer-noise-humming-sound/" class="menu-link"><span class="text-wrap">Transformer noise</span></a></li> <li id="menu-item-6154" class="menu-item menu-item-type-post_type menu-item-object-post menu-item-6154"><a href="https://web.archive.org/web/20210422144856/https://www.electricalclassroom.com/transformer-kva-calculator/" class="menu-link"><span class="text-wrap">Transformer kVA calculator</span></a></li> <li id="menu-item-6157" class="menu-item menu-item-type-post_type menu-item-object-post menu-item-6157"><a href="https://web.archive.org/web/20210422144856/https://www.electricalclassroom.com/transformer-ratio-calculator-online/" class="menu-link"><span class="text-wrap">Transformer turns ratio</span></a></li> </ul> </li></ul> </li><li id="menu-item-476" class="menu-item menu-item-type-taxonomy menu-item-object-category menu-item-476"><a href="https://web.archive.org/web/20210422144856/https://www.electricalclassroom.com/category/power-system/" class="menu-link"><span class="text-wrap">Power system</span></a></li><li id="menu-item-474" class="menu-item menu-item-type-taxonomy menu-item-object-category menu-item-474"><a href="https://web.archive.org/web/20210422144856/https://www.electricalclassroom.com/category/protection-and-switch-gears/" class="menu-link"><span class="text-wrap">Switchgears</span></a></li><li id="menu-item-475" class="menu-item menu-item-type-taxonomy menu-item-object-category current-post-ancestor current-menu-parent current-post-parent menu-item-475"><a href="https://web.archive.org/web/20210422144856/https://www.electricalclassroom.com/category/qa/" class="menu-link"><span class="text-wrap">Q&amp;A</span></a></li><li id="menu-item-166" class="menu-item menu-item-type-post_type menu-item-object-page current_page_parent menu-item-166"><a href="https://web.archive.org/web/20210422144856/https://www.electricalclassroom.com/blog/" class="menu-link"><span class="text-wrap">Articles</span></a></li><li id="menu-item-6060" class="menu-item menu-item-type-taxonomy menu-item-object-category menu-item-6060"><a href="https://web.archive.org/web/20210422144856/https://www.electricalclassroom.com/category/tools/" class="menu-link"><span class="text-wrap">Tools</span></a></li><li class="search-toggle-li"><a href="javascript:void(0)" class="site-search-toggle search-dropdown-toggle" aria-label="Search website"><span class="icon-magnifier" aria-hidden="true"></span></a></li></ul> <div id="searchform-dropdown" class="header-searchform-wrap clr"> <form role="search" method="get" class="searchform" action="https://web.archive.org/web/20210422144856/https://www.electricalclassroom.com/"> <label for="ocean-search-form-1"> <span class="screen-reader-text">Search for:</span> <input type="search" id="ocean-search-form-1" class="field" autocomplete="off" placeholder="Search" name="s"/> </label> </form> </div> </nav> </div> <div class="oceanwp-mobile-menu-icon clr mobile-right"> <a href="javascript:void(0)" class="mobile-menu" aria-label="Mobile Menu"> <i class="fa fa-bars" aria-hidden="true"></i> <span class="oceanwp-text">Menu</span> <span class="oceanwp-close-text">Close</span> </a> </div> </div> <div id="mobile-dropdown" class="clr"> <nav class="clr" itemscope="itemscope" itemtype="https://schema.org/SiteNavigationElement"> <ul id="menu-primary-menu-1" class="menu"><li class="menu-item menu-item-type-custom menu-item-object-custom menu-item-has-children menu-item-3447"><a href="/web/20210422144856/https://www.electricalclassroom.com/category/basics/">Basics</a> <ul class="sub-menu"> <li class="menu-item menu-item-type-custom menu-item-object-custom menu-item-3450"><a href="/web/20210422144856/https://www.electricalclassroom.com/electric-charge/">Charge</a></li> <li class="menu-item menu-item-type-custom menu-item-object-custom menu-item-3448"><a href="/web/20210422144856/https://www.electricalclassroom.com/voltage-what-is-voltage-definition-explanation-example/">Voltage</a></li> <li class="menu-item menu-item-type-custom menu-item-object-custom menu-item-3449"><a href="/web/20210422144856/https://www.electricalclassroom.com/electric-current-and-current-flow/">Current</a></li> <li class="menu-item menu-item-type-custom menu-item-object-custom menu-item-3453"><a href="/web/20210422144856/https://www.electricalclassroom.com/electric-resistance-what-is-resistance/">Resistance</a></li> <li class="menu-item menu-item-type-custom menu-item-object-custom menu-item-3466"><a href="/web/20210422144856/https://www.electricalclassroom.com/capacitance-what-is-capacitance-what-is-a-capacitor/">Capacitance</a></li> <li class="menu-item menu-item-type-custom menu-item-object-custom menu-item-3481"><a href="/web/20210422144856/https://www.electricalclassroom.com/inductance-what-is-inductance-what-is-an-inductor/">Inductance</a></li> <li class="menu-item menu-item-type-custom menu-item-object-custom menu-item-3482"><a href="/web/20210422144856/https://www.electricalclassroom.com/conductance-what-is-conductance/">Conductance</a></li> <li class="menu-item menu-item-type-custom menu-item-object-custom menu-item-3452"><a href="/web/20210422144856/https://www.electricalclassroom.com/what-is-electric-power/">Power</a></li> <li class="menu-item menu-item-type-custom menu-item-object-custom menu-item-3451"><a href="/web/20210422144856/https://www.electricalclassroom.com/what-is-energy/">Energy</a></li> <li class="menu-item menu-item-type-post_type menu-item-object-post menu-item-5944"><a href="https://web.archive.org/web/20210422144856/https://www.electricalclassroom.com/electromagnetic-induction/">Electromagnetic Induction</a></li> <li class="menu-item menu-item-type-custom menu-item-object-custom menu-item-has-children menu-item-3501"><a href="#">AC Basics</a> <ul class="sub-menu"> <li class="menu-item menu-item-type-custom menu-item-object-custom menu-item-3502"><a href="/web/20210422144856/https://www.electricalclassroom.com/alternating-current-basics/">AC Basics</a></li> <li class="menu-item menu-item-type-custom menu-item-object-custom menu-item-3503"><a href="/web/20210422144856/https://www.electricalclassroom.com/real-reactive-complex-apparent-power/">Real Power</a></li> <li class="menu-item menu-item-type-custom menu-item-object-custom menu-item-3504"><a href="/web/20210422144856/https://www.electricalclassroom.com/real-reactive-complex-apparent-power/#Reactive-power">Reactive Power</a></li> <li class="menu-item menu-item-type-custom menu-item-object-custom menu-item-3505"><a href="/web/20210422144856/https://www.electricalclassroom.com/real-reactive-complex-apparent-power/#Complex-and-apparent-power">Complex and apparent Power</a></li> </ul> </li> </ul> </li> <li class="menu-item menu-item-type-taxonomy menu-item-object-category menu-item-has-children menu-item-473"><a href="https://web.archive.org/web/20210422144856/https://www.electricalclassroom.com/category/circuit-theory/">Circuit Theory</a> <ul class="sub-menu"> <li class="menu-item menu-item-type-custom menu-item-object-custom menu-item-4125"><a href="/web/20210422144856/https://www.electricalclassroom.com/what-is-an-electric-circuit/">Electric Circuit</a></li> <li class="menu-item menu-item-type-custom menu-item-object-custom menu-item-4126"><a href="/web/20210422144856/https://www.electricalclassroom.com/series-and-parallel-circuits/">Series and Parallel Connections</a></li> <li class="menu-item menu-item-type-post_type menu-item-object-post menu-item-5927"><a href="https://web.archive.org/web/20210422144856/https://www.electricalclassroom.com/faradays-law-of-induction/">Faraday’s law</a></li> <li class="menu-item menu-item-type-post_type menu-item-object-post menu-item-5897"><a href="https://web.archive.org/web/20210422144856/https://www.electricalclassroom.com/lenzs-law-equations-examples-problems/">Lenz’s law</a></li> <li class="menu-item menu-item-type-custom menu-item-object-custom menu-item-4127"><a href="/web/20210422144856/https://www.electricalclassroom.com/ohms-law-relationship-between-current-and-voltage/">Ohm’s Law</a></li> <li class="menu-item menu-item-type-custom menu-item-object-custom menu-item-4128"><a href="/web/20210422144856/https://www.electricalclassroom.com/kirchhoff-voltage-and-current-laws/">Kirchoff’s Laws</a></li> <li class="menu-item menu-item-type-custom menu-item-object-custom menu-item-4129"><a href="/web/20210422144856/https://www.electricalclassroom.com/voltage-division-rule-potential-divider-circuit/">Voltage Division</a></li> <li class="menu-item menu-item-type-custom menu-item-object-custom menu-item-4130"><a href="/web/20210422144856/https://www.electricalclassroom.com/current-division-rule/">Current Division</a></li> <li class="menu-item menu-item-type-custom menu-item-object-custom menu-item-4131"><a href="/web/20210422144856/https://www.electricalclassroom.com/thevenins-theorem-explanation-equivalent-circuit-and-solved-examples/">Thevenin’s Theorem</a></li> <li class="menu-item menu-item-type-custom menu-item-object-custom menu-item-4132"><a href="/web/20210422144856/https://www.electricalclassroom.com/what-is-nortons-theorem/">Norton’s Theorem</a></li> <li class="menu-item menu-item-type-custom menu-item-object-custom menu-item-4133"><a href="/web/20210422144856/https://www.electricalclassroom.com/maximum-power-transfer-theorem/">Maximum Power transfer theorem</a></li> <li class="menu-item menu-item-type-custom menu-item-object-custom menu-item-4134"><a href="/web/20210422144856/https://www.electricalclassroom.com/superposition-theorem/">Superposition theorem</a></li> </ul> </li> <li class="menu-item menu-item-type-post_type menu-item-object-post menu-item-has-children menu-item-4626"><a href="https://web.archive.org/web/20210422144856/https://www.electricalclassroom.com/electric-machines/">Machines</a> <ul class="sub-menu"> <li class="menu-item menu-item-type-post_type menu-item-object-post menu-item-has-children menu-item-6149"><a href="https://web.archive.org/web/20210422144856/https://www.electricalclassroom.com/electric-transformers/">Transformers</a> <ul class="sub-menu"> <li class="menu-item menu-item-type-post_type menu-item-object-post menu-item-6151"><a href="https://web.archive.org/web/20210422144856/https://www.electricalclassroom.com/transformer-action/">Transformer Action</a></li> <li class="menu-item menu-item-type-post_type menu-item-object-post menu-item-6144"><a href="https://web.archive.org/web/20210422144856/https://www.electricalclassroom.com/ideal-transformer/">Ideal Transformer</a></li> <li class="menu-item menu-item-type-post_type menu-item-object-post menu-item-6141"><a href="https://web.archive.org/web/20210422144856/https://www.electricalclassroom.com/emf-equation-of-transformers/">EMF equation</a></li> <li class="menu-item menu-item-type-post_type menu-item-object-post menu-item-6142"><a href="https://web.archive.org/web/20210422144856/https://www.electricalclassroom.com/equivalent-circuit-of-transformer/">Equivalent circuit and Phasor diagram</a></li> <li class="menu-item menu-item-type-post_type menu-item-object-post menu-item-6136"><a href="https://web.archive.org/web/20210422144856/https://www.electricalclassroom.com/voltage-regulation-of-transformers/">Voltage regulation</a></li> <li class="menu-item menu-item-type-post_type menu-item-object-post menu-item-6147"><a href="https://web.archive.org/web/20210422144856/https://www.electricalclassroom.com/parts-of-a-transformer/">Parts of a transformer</a></li> <li class="menu-item menu-item-type-post_type menu-item-object-post menu-item-6146"><a href="https://web.archive.org/web/20210422144856/https://www.electricalclassroom.com/open-circuit-test-short-circuit-test/">Transformer tresting</a></li> <li class="menu-item menu-item-type-post_type menu-item-object-post menu-item-6155"><a href="https://web.archive.org/web/20210422144856/https://www.electricalclassroom.com/transformer-losses-load-no-load-losses/">Load losses and No-load losses</a></li> <li class="menu-item menu-item-type-post_type menu-item-object-post menu-item-has-children menu-item-6158"><a href="https://web.archive.org/web/20210422144856/https://www.electricalclassroom.com/types-of-transformers-types/">Types</a> <ul class="sub-menu"> <li class="menu-item menu-item-type-post_type menu-item-object-post menu-item-6140"><a href="https://web.archive.org/web/20210422144856/https://www.electricalclassroom.com/core-type-and-shell-type-transformers/">Core type and shell type transformers</a></li> </ul> </li> <li class="menu-item menu-item-type-post_type menu-item-object-post menu-item-6139"><a href="https://web.archive.org/web/20210422144856/https://www.electricalclassroom.com/magnetization-current-in-a-transformer/">Magnetization current</a></li> <li class="menu-item menu-item-type-post_type menu-item-object-post menu-item-6145"><a href="https://web.archive.org/web/20210422144856/https://www.electricalclassroom.com/magnetization-inrush-current/">Magnetization inrush</a></li> <li class="menu-item menu-item-type-post_type menu-item-object-post menu-item-6143"><a href="https://web.archive.org/web/20210422144856/https://www.electricalclassroom.com/high-leg-delta-connection/">High Leg delta connection</a></li> <li class="menu-item menu-item-type-post_type menu-item-object-post menu-item-6138"><a href="https://web.archive.org/web/20210422144856/https://www.electricalclassroom.com/what-is-buchholz-relay-why-is-it-used/">Buchholz relay</a></li> <li class="menu-item menu-item-type-post_type menu-item-object-post menu-item-6137"><a href="https://web.archive.org/web/20210422144856/https://www.electricalclassroom.com/autotransformers-variac-dimmerstat/">Autotransformer</a></li> <li class="menu-item menu-item-type-post_type menu-item-object-post menu-item-has-children menu-item-6148"><a href="https://web.archive.org/web/20210422144856/https://www.electricalclassroom.com/selection-and-sizing-of-transformers/">Selection</a> <ul class="sub-menu"> <li class="menu-item menu-item-type-post_type menu-item-object-post menu-item-6152"><a href="https://web.archive.org/web/20210422144856/https://www.electricalclassroom.com/transformer-faq-interview/">Frequently asked questions-1</a></li> <li class="menu-item menu-item-type-post_type menu-item-object-post menu-item-6153"><a href="https://web.archive.org/web/20210422144856/https://www.electricalclassroom.com/transformer-faq-interview-questions-1/">Frequently asked questions-2</a></li> <li class="menu-item menu-item-type-post_type menu-item-object-post menu-item-6150"><a href="https://web.archive.org/web/20210422144856/https://www.electricalclassroom.com/transformer-faq-interview-questions-part-3/">Frequently asked questions-3</a></li> </ul> </li> <li class="menu-item menu-item-type-post_type menu-item-object-post menu-item-6156"><a href="https://web.archive.org/web/20210422144856/https://www.electricalclassroom.com/transformer-noise-humming-sound/">Transformer noise</a></li> <li class="menu-item menu-item-type-post_type menu-item-object-post menu-item-6154"><a href="https://web.archive.org/web/20210422144856/https://www.electricalclassroom.com/transformer-kva-calculator/">Transformer kVA calculator</a></li> <li class="menu-item menu-item-type-post_type menu-item-object-post menu-item-6157"><a href="https://web.archive.org/web/20210422144856/https://www.electricalclassroom.com/transformer-ratio-calculator-online/">Transformer turns ratio</a></li> </ul> </li> </ul> </li> <li class="menu-item menu-item-type-taxonomy menu-item-object-category menu-item-476"><a href="https://web.archive.org/web/20210422144856/https://www.electricalclassroom.com/category/power-system/">Power system</a></li> <li class="menu-item menu-item-type-taxonomy menu-item-object-category menu-item-474"><a href="https://web.archive.org/web/20210422144856/https://www.electricalclassroom.com/category/protection-and-switch-gears/">Switchgears</a></li> <li class="menu-item menu-item-type-taxonomy menu-item-object-category current-post-ancestor current-menu-parent current-post-parent menu-item-475"><a href="https://web.archive.org/web/20210422144856/https://www.electricalclassroom.com/category/qa/">Q&amp;A</a></li> <li class="menu-item menu-item-type-post_type menu-item-object-page current_page_parent menu-item-166"><a href="https://web.archive.org/web/20210422144856/https://www.electricalclassroom.com/blog/">Articles</a></li> <li class="menu-item menu-item-type-taxonomy menu-item-object-category menu-item-6060"><a href="https://web.archive.org/web/20210422144856/https://www.electricalclassroom.com/category/tools/">Tools</a></li> <li class="search-toggle-li"><a href="javascript:void(0)" class="site-search-toggle search-dropdown-toggle" aria-label="Search website"><span class="icon-magnifier" aria-hidden="true"></span></a></li></ul> <div id="mobile-menu-search" class="clr"> <form method="get" action="https://web.archive.org/web/20210422144856/https://www.electricalclassroom.com/" class="mobile-searchform" role="search" aria-label="Search for:"> <label for="ocean-mobile-search2"> <input type="search" name="s" autocomplete="off" placeholder="Search"/> <button type="submit" class="searchform-submit" aria-label="Submit search"> <i class="icon-magnifier" aria-hidden="true"></i> </button> </label> </form> </div> </nav> </div> </header> <main id="main" class="site-main clr" role="main"> <header class="page-header hidden-page-header"> <div class="container clr page-header-inner"> <h2 class="page-header-title clr" itemprop="headline">What is kA rating of MCB and MCCB?</h2> <div class="site-breadcrumbs clr position-under-title"><a href="https://web.archive.org/web/20210422144856/https://www.electricalclassroom.com/">Home</a><span class="separator"> - </span><a href="https://web.archive.org/web/20210422144856/https://www.electricalclassroom.com/category/qa/">Q&amp;A</a><span class="separator"> - </span><span class="last">What is kA rating of MCB and MCCB?</span></div> </div> </header> <div id="content-wrap" class="container clr"> <div id="primary" class="content-area clr"> <div id="content" class="site-content clr"> <article id="post-3555"> <header class="entry-header clr"> <h1 class="single-post-title entry-title" itemprop="headline">What is kA rating of MCB and MCCB?</h1> </header> <div class="entry-content clr" itemprop="text"> <div class="code-block code-block-2" style="margin: 8px 0; clear: both;"> <ins class="adsbygoogle" style="display:block" data-ad-client="ca-pub-4567036280313464" data-ad-slot="7226276104" data-ad-format="auto" data-full-width-responsive="true"></ins> <script> (adsbygoogle = window.adsbygoogle || []).push({}); </script></div> <p>kA rating of an MCB or an MCCB is the maximum current it can safely interrupt in case of a short circuit. If the current goes beyond this value, the circuit breaker could be damaged. kA rating is known as the short circuit withstand capacity or ultimate breaking capacity of a circuit breaker. It is denoted by Icu.</p> <div class="wp-block-image"><figure class="aligncenter size-large is-resized"><picture class="wp-image-3554"> <source type="image/webp" data-lazy-srcset="https://www.electricalclassroom.com/wp-content/uploads/2020/02/circuit-breakers-marking-2.png.webp 560w, https://www.electricalclassroom.com/wp-content/uploads/2020/02/circuit-breakers-marking-2-300x253.png.webp 300w" srcset="data:image/svg+xml,%3Csvg%20xmlns='http://www.w3.org/2000/svg'%20viewBox='0%200%20304%20257'%3E%3C/svg%3E" data-lazy-sizes="(max-width: 304px) 100vw, 304px"/> <img src="data:image/svg+xml,%3Csvg%20xmlns='http://www.w3.org/2000/svg'%20viewBox='0%200%20304%20257'%3E%3C/svg%3E" alt="kA rating of MCB and MCCB" width="304" height="257" data-lazy-srcset="https://web.archive.org/web/20210422144856/https://www.electricalclassroom.com/wp-content/uploads/2020/02/circuit-breakers-marking-2.png 560w, https://www.electricalclassroom.com/wp-content/uploads/2020/02/circuit-breakers-marking-2-300x253.png 300w" data-lazy-sizes="(max-width: 304px) 100vw, 304px" data-lazy-src="https://web.archive.org/web/20210422144856/https://www.electricalclassroom.com/wp-content/uploads/2020/02/circuit-breakers-marking-2.png"/> </picture> <noscript><picture class="wp-image-3554"> <source type="image/webp" srcset="https://web.archive.org/web/20210422144856im_/https://www.electricalclassroom.com/wp-content/uploads/2020/02/circuit-breakers-marking-2.png.webp 560w, https://web.archive.org/web/20210422144856im_/https://www.electricalclassroom.com/wp-content/uploads/2020/02/circuit-breakers-marking-2-300x253.png.webp 300w" sizes="(max-width: 304px) 100vw, 304px"/> <img src="https://web.archive.org/web/20210422144856im_/https://www.electricalclassroom.com/wp-content/uploads/2020/02/circuit-breakers-marking-2.png" alt="kA rating of MCB and MCCB" width="304" height="257" srcset="https://web.archive.org/web/20210422144856im_/https://www.electricalclassroom.com/wp-content/uploads/2020/02/circuit-breakers-marking-2.png 560w, https://web.archive.org/web/20210422144856im_/https://www.electricalclassroom.com/wp-content/uploads/2020/02/circuit-breakers-marking-2-300x253.png 300w" sizes="(max-width: 304px) 100vw, 304px"/> </picture> </noscript></figure></div> <p>For example, if the MCB is rated at 10kA, it means that the MCB can safely break the circuits during short circuit unless until the short-circuited current does not exceed 10kA.</p> <p>MCB stands for ‘Miniature Circuit Breaker’ and MCCB stands for ‘Moulded Case Circuit Breaker’. These are circuit protection devices, capable of protecting circuits from greater damages caused during short circuit and overloads. </p> <p>Under short-circuited conditions, the current flow increases exponentially. That means during short circuits a circuit designed for 10A can cause a current flow of over thousands of amperes. If the circuit breaker used has a very low rating or ultimate short circuit withstand current rating, circuit breaker, as well as the circuit, will be damaged. Therefore, kA rating of a circuit breaker is significant. </p> <h2>Importance of kA rating</h2> <p>The <strong>kA rating</strong> is a very important factor of any circuit breaker. The maximum amount of current flow through a circuit breaker during short circuit varies from one circuit to another. It is necessary to pre-calculate and use the right circuit breaker to avoid danger. Incorrect kA rating can be a potential hazard, causing fire and can be sometimes fatal.</p> <div class="wp-block-group has-very-light-gray-background-color has-background"><div class="wp-block-group__inner-container"> <p>Read more:</p> <p><a href="/web/20210422144856/https://www.electricalclassroom.com/miniature-circuit-breaker-mcb-principle-of-operation/">Principle of operation of MCB</a></p> <p><a href="/web/20210422144856/https://www.electricalclassroom.com/what-is-meant-by-b-c-d-k-and-z-curves-in-mcbs/">Trip Curves of MCB </a></p> <p><a href="/web/20210422144856/https://www.electricalclassroom.com/what-is-the-difference-between-mcb-and-mccb/">Difference between MCB and MCCB</a></p> </div></div> <div class="code-block code-block-7" style="margin: 8px auto; text-align: center; display: block; clear: both;"> <ins class="adsbygoogle" style="display:block" data-ad-format="autorelaxed" data-ad-client="ca-pub-4567036280313464" data-ad-slot="6212986764"></ins> <script> (adsbygoogle = window.adsbygoogle || []).push({}); </script></div> </div> <section id="comments" class="comments-area clr has-comments"> <div id="respond" class="comment-respond"> <h3 id="reply-title" class="comment-reply-title">Leave a Reply <small><a rel="nofollow" id="cancel-comment-reply-link" href="/web/20210422144856/https://www.electricalclassroom.com/what-is-ka-rating-of-mcb-mccb/#respond" style="display:none;">Cancel reply</a></small></h3><form action="https://web.archive.org/web/20210422144856/https://www.electricalclassroom.com/wp-comments-post.php" method="post" id="commentform" class="comment-form" novalidate=""><div class="comment-textarea"><label for="comment" class="screen-reader-text">Comment</label><textarea autocomplete="new-password" id="he1e8285b6" name="he1e8285b6" cols="39" rows="4" tabindex="0" class="textarea-comment" placeholder="Your comment here..."></textarea><textarea id="comment" aria-hidden="true" name="comment" autocomplete="new-password" style="padding:0 !important;clip:rect(1px, 1px, 1px, 1px) !important;position:absolute !important;white-space:nowrap !important;height:1px !important;width:1px !important;overflow:hidden !important;" tabindex="-1"></textarea><script data-noptimize="" type="text/javascript">document.getElementById("comment").setAttribute( "id", "afe96eeb54ae7c48bad777c137b1708b" );document.getElementById("he1e8285b6").setAttribute( "id", "comment" );</script></div><div class="comment-form-author"><label for="author" class="screen-reader-text">Enter your name or username to comment</label><input type="text" name="author" id="author" value="" placeholder="Name (required)" size="22" tabindex="0" aria-required="true" class="input-name"/></div> <div class="comment-form-email"><label for="email" class="screen-reader-text">Enter your email address to comment</label><input type="text" name="email" id="email" value="" placeholder="Email (required)" size="22" tabindex="0" aria-required="true" class="input-email"/></div> <div class="comment-form-url"><label for="url" class="screen-reader-text">Enter your website URL (optional)</label><input type="text" name="url" id="url" value="" placeholder="Website" size="22" tabindex="0" class="input-website"/></div> <p class="form-submit"><input name="submit" type="submit" id="comment-submit" class="submit" value="Post Comment"/> <input type="hidden" name="comment_post_ID" value="3555" id="comment_post_ID"/> <input type="hidden" name="comment_parent" id="comment_parent" value="0"/> </p></form> </div> </section> </article> <div class="code-block code-block-3 ai-viewport-3" style="margin: 8px 0; clear: both;"> <script> (adsbygoogle = window.adsbygoogle || []).push({ google_ad_client: "ca-pub-4567036280313464", enable_page_level_ads: true }); <!-- mobile auto-ads --> </script></div> <div class="code-block code-block-6" style="margin: 8px 0; clear: both;"> <ins class="adsbygoogle" style="display:block" data-ad-client="ca-pub-4567036280313464" data-ad-slot="4543662666" data-ad-format="auto" data-full-width-responsive="true"></ins> <script> (adsbygoogle = window.adsbygoogle || []).push({}); </script></div> </div> </div> <aside id="right-sidebar" class="sidebar-container widget-area sidebar-primary" itemscope="itemscope" itemtype="https://schema.org/WPSideBar" role="complementary" aria-label="Primary Sidebar"> <div id="right-sidebar-inner" class="clr"> <div id="search-2" class="sidebar-box widget_search clr"><h4 class="widget-title">Find a content</h4> <form role="search" method="get" class="searchform" action="https://web.archive.org/web/20210422144856/https://www.electricalclassroom.com/"> <label for="ocean-search-form-3"> <span class="screen-reader-text">Search for:</span> <input type="search" id="ocean-search-form-3" class="field" autocomplete="off" placeholder="Search" name="s"/> </label> </form> </div><div id="custom_html-2" class="widget_text sidebar-box widget_custom_html clr"><h4 class="widget-title">Like &amp; Follow us</h4><div class="textwidget custom-html-widget"><iframe loading="lazy" src="about:blank" width="74" height="65" style="border:none;overflow:hidden" scrolling="no" frameborder="0" allowfullscreen="true" allow="autoplay; clipboard-write; encrypted-media; picture-in-picture; web-share" data-rocket-lazyload="fitvidscompatible" data-lazy-src="https://www.facebook.com/plugins/like.php?href=https%3A%2F%2Fwww.facebook.com%2Felectricalclassroom%2F&amp;width=74&amp;layout=box_count&amp;action=like&amp;size=large&amp;share=false&amp;height=65&amp;appId"></iframe><noscript><iframe src="https://web.archive.org/web/20210422144856if_/https://www.facebook.com/plugins/like.php?href=https%3A%2F%2Fwww.facebook.com%2Felectricalclassroom%2F&amp;width=74&amp;layout=box_count&amp;action=like&amp;size=large&amp;share=false&amp;height=65&amp;appId" width="74" height="65" style="border:none;overflow:hidden" scrolling="no" frameborder="0" allowfullscreen="true" allow="autoplay; clipboard-write; encrypted-media; picture-in-picture; web-share"></iframe></noscript><a href="https://web.archive.org/web/20210422144856/https://twitter.com/electricclassro?ref_src=twsrc%5Etfw" class="twitter-follow-button" data-show-count="false">Follow @electricclassro</a><script data-rocketlazyloadscript="https://platform.twitter.com/widgets.js" async="" charset="utf-8"></script></div></div><div id="ai_widget-21" class="sidebar-box ai_widget clr"><div class="code-block code-block-5" style="margin: 8px auto; text-align: center; display: block; clear: both;"> <ins class="adsbygoogle" style="display:inline-block;width:300px;height:250px" data-ad-client="ca-pub-4567036280313464" data-ad-slot="3998655228"></ins> <script> (adsbygoogle = window.adsbygoogle || []).push({}); </script></div> </div><div id="widget_crp-5" class="sidebar-box widget_widget_crp clr"><h4 class="widget-title">Related Articles:</h4><div class="crp_related_widget "><ul><li><a href="https://web.archive.org/web/20210422144856/https://www.electricalclassroom.com/ultimate-breaking-capacity-icu/" class="crp_link post-6650"><span class="crp_title">Ultimate breaking capacity (Icu) and Service…</span></a></li><li><a href="https://web.archive.org/web/20210422144856/https://www.electricalclassroom.com/what-is-an-mcb/" class="crp_link post-3550"><span class="crp_title">What is an MCB?</span></a></li><li><a href="https://web.archive.org/web/20210422144856/https://www.electricalclassroom.com/difference-between-mcb-mccb-rccb-rcbo-isolator/" class="crp_link post-807"><span class="crp_title">Difference between MCB, MCCB, RCCB, RCBO and Isolator</span></a></li><li><a href="https://web.archive.org/web/20210422144856/https://www.electricalclassroom.com/circuit-breaker-trip-mcb-trip/" class="crp_link post-5180"><span class="crp_title">Top 3 causes behind a circuit breaker trip | MCB Trip</span></a></li><li><a href="https://web.archive.org/web/20210422144856/https://www.electricalclassroom.com/difference-between-circuit-breaker-and-isolator/" class="crp_link post-783"><span class="crp_title">Difference between circuit breaker and isolator</span></a></li><li><a href="https://web.archive.org/web/20210422144856/https://www.electricalclassroom.com/difference-between-mcb-and-rcbo/" class="crp_link post-339"><span class="crp_title">Difference between MCB and RCBO</span></a></li><li><a href="https://web.archive.org/web/20210422144856/https://www.electricalclassroom.com/b-c-d-k-and-z-mcb-trip-curves/" class="crp_link post-348"><span class="crp_title">MCB Trip Curves - B, C, D, K and Z trip curves</span></a></li><li><a href="https://web.archive.org/web/20210422144856/https://www.electricalclassroom.com/top-5-differences-between-mcb-and-rccb/" class="crp_link post-781"><span class="crp_title">Top 5 differences between MCB and RCCB</span></a></li><li><a href="https://web.archive.org/web/20210422144856/https://www.electricalclassroom.com/difference-between-fuse-and-mcb/" class="crp_link post-4420"><span class="crp_title">Difference between fuse and MCB</span></a></li><li><a href="https://web.archive.org/web/20210422144856/https://www.electricalclassroom.com/an-overview-of-switchgear/" class="crp_link post-5411"><span class="crp_title">An overview of switchgear</span></a></li><li><a href="https://web.archive.org/web/20210422144856/https://www.electricalclassroom.com/difference-between-short-circuit-and-overload/" class="crp_link post-1013"><span class="crp_title">Difference between Short circuit and overload</span></a></li><li><a href="https://web.archive.org/web/20210422144856/https://www.electricalclassroom.com/what-is-an-arc-chute/" class="crp_link post-3939"><span class="crp_title">What is an arc chute?</span></a></li><li><a href="https://web.archive.org/web/20210422144856/https://www.electricalclassroom.com/star-delta-starter-design-tool/" class="crp_link post-5574"><span class="crp_title">Star-Delta starter design tool | Wye-Delta starter…</span></a></li><li><a href="https://web.archive.org/web/20210422144856/https://www.electricalclassroom.com/difference-fuses-and-circuit-breakers/" class="crp_link post-4435"><span class="crp_title">Top 5 differences between fuses and circuit breakers</span></a></li><li><a href="https://web.archive.org/web/20210422144856/https://www.electricalclassroom.com/miniature-circuit-breaker-mcb-working/" class="crp_link post-335"><span class="crp_title">Miniature circuit breaker (MCB) - Principle of operation</span></a></li></ul><div class="crp_clear"></div></div></div><div id="ai_widget-22" class="sidebar-box ai_widget clr ai-sticky-widget"><div class="code-block code-block-4" style="margin: 8px 0; clear: both;"> <ins class="adsbygoogle" style="display:block" data-ad-client="ca-pub-4567036280313464" data-ad-slot="6547478397" data-ad-format="auto" data-full-width-responsive="true"></ins> <script> (adsbygoogle = window.adsbygoogle || []).push({}); </script> </div> </div> </div> </aside> </div> </main> <footer id="footer" class="site-footer" itemscope="itemscope" itemtype="https://schema.org/WPFooter" role="contentinfo"> <div id="footer-inner" class="clr"> <div id="footer-bottom" class="clr no-footer-nav"> <div id="footer-bottom-inner" class="container clr"> <div id="copyright" class="clr" role="contentinfo"> Copyright © 2021 Electrical Classroom. Contents may not be reproduced. Our Site uses cookie. By continuing to use our site you are agreeing to our Cookie policy <a href="//web.archive.org/web/20210422144856/https://www.dmca.com/Protection/Status.aspx?ID=cf63e339-5285-44ab-a971-26a8cc0a6be9" title="DMCA.com Protection Status" class="dmca-badge"> <img src="data:image/svg+xml,%3Csvg%20xmlns='http://www.w3.org/2000/svg'%20viewBox='0%200%200%200'%3E%3C/svg%3E" alt="DMCA.com Protection Status" data-lazy-src="https://web.archive.org/web/20210422144856/https://images.dmca.com/Badges/dmca_protected_sml_120d.png?ID=cf63e339-5285-44ab-a971-26a8cc0a6be9"/><noscript><img src="https://web.archive.org/web/20210422144856im_/https://images.dmca.com/Badges/dmca_protected_sml_120d.png?ID=cf63e339-5285-44ab-a971-26a8cc0a6be9" alt="DMCA.com Protection Status"/></noscript></a> </div> </div> </div> </div> </footer> </div> </div> <a id="scroll-top" class="scroll-top-right" href="#"><span class="fa fa-angle-up" aria-label="Scroll to the top of the page"></span></a> <!--googleoff: all--><div id="cookie-law-info-bar" data-nosnippet="true"><h5 class="cli_messagebar_head">Cookie Policy</h5><span>This website uses cookies to improve your experience. We&#39;ll assume you&#39;re ok with this, but you can opt-out if you wish.<a role="button" tabindex="0" data-cli_action="accept" id="cookie_action_close_header" class="medium cli-plugin-button cli-plugin-main-button cookie_action_close_header cli_action_button" style="display:inline-block; ">Accept</a> <a href="https://web.archive.org/web/20210422144856/https://www.electricalclassroom.com/privacy-policy/" id="CONSTANT_OPEN_URL" target="_blank" class="medium cli-plugin-button cli-plugin-main-link" style="display:inline-block;">Read More</a></span></div><div id="cookie-law-info-again" style="display:none;" data-nosnippet="true"><span id="cookie_hdr_showagain">Privacy &amp; Cookies Policy</span></div><div class="cli-modal" data-nosnippet="true" id="cliSettingsPopup" tabindex="-1" role="dialog" aria-labelledby="cliSettingsPopup" aria-hidden="true"> <div class="cli-modal-dialog" role="document"> <div class="cli-modal-content cli-bar-popup"> <button type="button" class="cli-modal-close" id="cliModalClose"> <svg class="" viewbox="0 0 24 24"><path d="M19 6.41l-1.41-1.41-5.59 5.59-5.59-5.59-1.41 1.41 5.59 5.59-5.59 5.59 1.41 1.41 5.59-5.59 5.59 5.59 1.41-1.41-5.59-5.59z"></path><path d="M0 0h24v24h-24z" fill="none"></path></svg> <span class="wt-cli-sr-only">Close</span> </button> <div class="cli-modal-body"> <div class="cli-container-fluid cli-tab-container"> <div class="cli-row"> <div class="cli-col-12 cli-align-items-stretch cli-px-0"> <div class="cli-privacy-overview"> <h4>Privacy Overview</h4> <div class="cli-privacy-content"> <div class="cli-privacy-content-text">This website uses cookies to improve your experience while you navigate through the website. Out of these, the cookies that are categorized as necessary are stored on your browser as they are essential for the working of basic functionalities of the website. We also use third-party cookies that help us analyze and understand how you use this website. These cookies will be stored in your browser only with your consent. You also have the option to opt-out of these cookies. But opting out of some of these cookies may affect your browsing experience.</div> </div> <a class="cli-privacy-readmore" aria-label="Show more" tabindex="0" role="button" data-readmore-text="Show more" data-readless-text="Show less"></a> </div> </div> <div class="cli-col-12 cli-align-items-stretch cli-px-0 cli-tab-section-container"> <div class="cli-tab-section"> <div class="cli-tab-header"> <a role="button" tabindex="0" class="cli-nav-link cli-settings-mobile" data-target="necessary" data-toggle="cli-toggle-tab"> Necessary </a> <div class="wt-cli-necessary-checkbox"> <input type="checkbox" class="cli-user-preference-checkbox" id="wt-cli-checkbox-necessary" data-id="checkbox-necessary" checked="checked"/> <label class="form-check-label" for="wt-cli-checkbox-necessary">Necessary</label> </div> <span class="cli-necessary-caption">Always Enabled</span> </div> <div class="cli-tab-content"> <div class="cli-tab-pane cli-fade" data-id="necessary"> <p>Necessary cookies are absolutely essential for the website to function properly. This category only includes cookies that ensures basic functionalities and security features of the website. These cookies do not store any personal information.</p> </div> </div> </div> <div class="cli-tab-section"> <div class="cli-tab-header"> <a role="button" tabindex="0" class="cli-nav-link cli-settings-mobile" data-target="non-necessary" data-toggle="cli-toggle-tab"> Non-necessary </a> <div class="cli-switch"> <input type="checkbox" id="wt-cli-checkbox-non-necessary" class="cli-user-preference-checkbox" data-id="checkbox-non-necessary" checked="checked"/> <label for="wt-cli-checkbox-non-necessary" class="cli-slider" data-cli-enable="Enabled" data-cli-disable="Disabled"><span class="wt-cli-sr-only">Non-necessary</span></label> </div> </div> <div class="cli-tab-content"> <div class="cli-tab-pane cli-fade" data-id="non-necessary"> <p>Any cookies that may not be particularly necessary for the website to function and is used specifically to collect user personal data via analytics, ads, other embedded contents are termed as non-necessary cookies. It is mandatory to procure user consent prior to running these cookies on your website.</p> </div> </div> </div> </div> </div> </div> </div> <div class="cli-modal-footer"> <div class="wt-cli-element cli-container-fluid cli-tab-container"> <div class="cli-row"> <div class="cli-col-12 cli-align-items-stretch cli-px-0"> <div class="cli-tab-footer wt-cli-privacy-overview-actions"> <a id="wt-cli-privacy-save-btn" role="button" tabindex="0" data-cli-action="accept" class="wt-cli-privacy-btn cli_setting_save_button wt-cli-privacy-accept-btn cli-btn">SAVE &amp; ACCEPT</a> </div> </div> </div> </div> </div> </div> </div> </div> <div class="cli-modal-backdrop cli-fade cli-settings-overlay"></div> <div class="cli-modal-backdrop cli-fade cli-popupbar-overlay"></div> <!--googleon: all--> <div data-elementor-type="popup" data-elementor-id="6655" class="elementor elementor-6655 elementor-location-popup" data-elementor-settings="{&quot;entrance_animation&quot;:&quot;slideInRight&quot;,&quot;entrance_animation_duration&quot;:{&quot;unit&quot;:&quot;px&quot;,&quot;size&quot;:1.2,&quot;sizes&quot;:[]},&quot;triggers&quot;:{&quot;click&quot;:&quot;yes&quot;,&quot;click_times&quot;:1},&quot;timing&quot;:{&quot;page_views_views&quot;:1,&quot;page_views&quot;:&quot;yes&quot;,&quot;times_times&quot;:1,&quot;times&quot;:&quot;yes&quot;}}"> <div class="elementor-section-wrap"> <section class="elementor-section elementor-top-section elementor-element elementor-element-56a25285 elementor-section-boxed elementor-section-height-default elementor-section-height-default" data-id="56a25285" data-element_type="section"> <div class="elementor-container elementor-column-gap-default"> <div class="elementor-row"> <div class="elementor-column elementor-col-100 elementor-top-column elementor-element elementor-element-242167ed" data-id="242167ed" data-element_type="column"> <div class="elementor-column-wrap elementor-element-populated"> <div class="elementor-widget-wrap"> <div class="elementor-element elementor-element-3a5465be elementor-widget elementor-widget-heading" data-id="3a5465be" data-element_type="widget" data-widget_type="heading.default"> <div class="elementor-widget-container"> <h2 class="elementor-heading-title elementor-size-default">Clear all you queries</h2> </div> </div> <div class="elementor-element elementor-element-161278ec elementor-widget elementor-widget-heading" data-id="161278ec" data-element_type="widget" data-widget_type="heading.default"> <div class="elementor-widget-container"> <h2 class="elementor-heading-title elementor-size-default">Ask us</h2> </div> </div> <div class="elementor-element elementor-element-e00bc17 elementor-widget elementor-widget-text-editor" data-id="e00bc17" data-element_type="widget" data-widget_type="text-editor.default"> <div class="elementor-widget-container"> <div class="elementor-text-editor elementor-clearfix"><h6 style="text-align: center;"><span style="color: #ffffff;">We are here to help you.</span></h6></div> </div> </div> <div class="elementor-element elementor-element-1e7dbc23 elementor-widget-divider--view-line elementor-widget elementor-widget-divider" data-id="1e7dbc23" data-element_type="widget" data-widget_type="divider.default"> <div class="elementor-widget-container"> <div class="elementor-divider"> <span class="elementor-divider-separator"> </span> </div> </div> </div> <div class="elementor-element elementor-element-e9708af elementor-button-align-stretch elementor-widget elementor-widget-form" data-id="e9708af" data-element_type="widget" data-settings="{&quot;step_next_label&quot;:&quot;Next&quot;,&quot;step_previous_label&quot;:&quot;Previous&quot;,&quot;button_width&quot;:&quot;100&quot;,&quot;step_type&quot;:&quot;number_text&quot;,&quot;step_icon_shape&quot;:&quot;circle&quot;}" data-widget_type="form.default"> <div class="elementor-widget-container"> <form class="elementor-form" method="post" name="New Form"> <input type="hidden" name="post_id" value="6655"/> <input type="hidden" name="form_id" value="e9708af"/> <input type="hidden" name="referer_title" value="What is kA rating of MCB and MCCB?"/> <input type="hidden" name="queried_id" value="3555"/> <div class="elementor-form-fields-wrapper elementor-labels-above"> <div class="elementor-field-type-text elementor-field-group elementor-column elementor-field-group-name elementor-col-100"> <label for="form-field-name" class="elementor-field-label">Name</label><input size="1" type="text" name="form_fields[name]" id="form-field-name" class="elementor-field elementor-size-sm elementor-field-textual" placeholder="Name"/> </div> <div class="elementor-field-type-email elementor-field-group elementor-column elementor-field-group-email elementor-col-100 elementor-field-required"> <label for="form-field-email" class="elementor-field-label">Email</label><input size="1" type="email" name="form_fields[email]" id="form-field-email" class="elementor-field elementor-size-sm elementor-field-textual" placeholder="Email" required="required" aria-required="true"/> </div> <div class="elementor-field-type-textarea elementor-field-group elementor-column elementor-field-group-message elementor-col-100"> <label for="form-field-message" class="elementor-field-label">Message</label><textarea class="elementor-field-textual elementor-field elementor-size-sm" name="form_fields[message]" id="form-field-message" rows="4" placeholder="Message"></textarea> </div> <div class="elementor-field-group elementor-column elementor-field-type-submit elementor-col-100 e-form__buttons"> <button type="submit" class="elementor-button elementor-size-sm"> <span> <span class=" elementor-button-icon"> </span> <span class="elementor-button-text">Send</span> </span> </button> </div> </div> </form> </div> </div> </div> </div> </div> </div> </div> </section> </div> </div> <script type="text/javascript" id="rocket-browser-checker-js-after"> "use strict";var _createClass=function(){function defineProperties(target,props){for(var i=0;i<props.length;i++){var descriptor=props[i];descriptor.enumerable=descriptor.enumerable||!1,descriptor.configurable=!0,"value"in descriptor&&(descriptor.writable=!0),Object.defineProperty(target,descriptor.key,descriptor)}}return function(Constructor,protoProps,staticProps){return protoProps&&defineProperties(Constructor.prototype,protoProps),staticProps&&defineProperties(Constructor,staticProps),Constructor}}();function _classCallCheck(instance,Constructor){if(!(instance instanceof Constructor))throw new TypeError("Cannot call a class as a function")}var RocketBrowserCompatibilityChecker=function(){function RocketBrowserCompatibilityChecker(options){_classCallCheck(this,RocketBrowserCompatibilityChecker),this.passiveSupported=!1,this._checkPassiveOption(this),this.options=!!this.passiveSupported&&options}return _createClass(RocketBrowserCompatibilityChecker,[{key:"_checkPassiveOption",value:function(self){try{var options={get passive(){return!(self.passiveSupported=!0)}};window.addEventListener("test",null,options),window.removeEventListener("test",null,options)}catch(err){self.passiveSupported=!1}}},{key:"initRequestIdleCallback",value:function(){!1 in window&&(window.requestIdleCallback=function(cb){var start=Date.now();return setTimeout(function(){cb({didTimeout:!1,timeRemaining:function(){return Math.max(0,50-(Date.now()-start))}})},1)}),!1 in window&&(window.cancelIdleCallback=function(id){return clearTimeout(id)})}},{key:"isDataSaverModeOn",value:function(){return"connection"in navigator&&!0===navigator.connection.saveData}},{key:"supportsLinkPrefetch",value:function(){var elem=document.createElement("link");return elem.relList&&elem.relList.supports&&elem.relList.supports("prefetch")&&window.IntersectionObserver&&"isIntersecting"in IntersectionObserverEntry.prototype}},{key:"isSlowConnection",value:function(){return"connection"in navigator&&"effectiveType"in navigator.connection&&("2g"===navigator.connection.effectiveType||"slow-2g"===navigator.connection.effectiveType)}}]),RocketBrowserCompatibilityChecker}(); </script> <script type="text/javascript" id="rocket-delay-js-js-after"> (function() { "use strict";var e=function(){function n(e,t){for(var r=0;r<t.length;r++){var n=t[r];n.enumerable=n.enumerable||!1,n.configurable=!0,"value"in n&&(n.writable=!0),Object.defineProperty(e,n.key,n)}}return function(e,t,r){return t&&n(e.prototype,t),r&&n(e,r),e}}();function n(e,t){if(!(e instanceof t))throw new TypeError("Cannot call a class as a function")}var t=function(){function r(e,t){n(this,r),this.attrName="data-rocketlazyloadscript",this.browser=t,this.options=this.browser.options,this.triggerEvents=e,this.userEventListener=this.triggerListener.bind(this)}return e(r,[{key:"init",value:function(){this._addEventListener(this)}},{key:"reset",value:function(){this._removeEventListener(this)}},{key:"_addEventListener",value:function(t){this.triggerEvents.forEach(function(e){return window.addEventListener(e,t.userEventListener,t.options)})}},{key:"_removeEventListener",value:function(t){this.triggerEvents.forEach(function(e){return window.removeEventListener(e,t.userEventListener,t.options)})}},{key:"_loadScriptSrc",value:function(){var r=this,e=document.querySelectorAll("script["+this.attrName+"]");0!==e.length&&Array.prototype.slice.call(e).forEach(function(e){var t=e.getAttribute(r.attrName);e.setAttribute("src",t),e.removeAttribute(r.attrName)}),this.reset()}},{key:"triggerListener",value:function(){this._loadScriptSrc(),this._removeEventListener(this)}}],[{key:"run",value:function(){RocketBrowserCompatibilityChecker&&new r(["keydown","mouseover","touchmove","touchstart","wheel"],new RocketBrowserCompatibilityChecker({passive:!0})).init()}}]),r}();t.run(); }()); </script> <script type="text/javascript" id="rocket-preload-links-js-extra"> /* <![CDATA[ */ var RocketPreloadLinksConfig = {"excludeUris":"\/(.+\/)?feed\/?.+\/?|\/(?:.+\/)?embed\/|\/(index\\.php\/)?wp\\-json(\/.*|$)|\/god-is-great\/|\/wp-admin\/|\/logout\/|\/god-is-great\/","usesTrailingSlash":"1","imageExt":"jpg|jpeg|gif|png|tiff|bmp|webp|avif","fileExt":"jpg|jpeg|gif|png|tiff|bmp|webp|avif|php|pdf|html|htm","siteUrl":"https:\/\/web.archive.org\/web\/20210422144856\/https:\/\/www.electricalclassroom.com","onHoverDelay":"100","rateThrottle":"3"}; /* ]]> */ </script> <script type="text/javascript" id="rocket-preload-links-js-after"> (function() { "use strict";var r="function"==typeof Symbol&&"symbol"==typeof Symbol.iterator?function(e){return typeof e}:function(e){return e&&"function"==typeof Symbol&&e.constructor===Symbol&&e!==Symbol.prototype?"symbol":typeof e},e=function(){function i(e,t){for(var n=0;n<t.length;n++){var i=t[n];i.enumerable=i.enumerable||!1,i.configurable=!0,"value"in i&&(i.writable=!0),Object.defineProperty(e,i.key,i)}}return function(e,t,n){return t&&i(e.prototype,t),n&&i(e,n),e}}();function i(e,t){if(!(e instanceof t))throw new TypeError("Cannot call a class as a function")}var t=function(){function n(e,t){i(this,n),this.browser=e,this.config=t,this.options=this.browser.options,this.prefetched=new Set,this.eventTime=null,this.threshold=1111,this.numOnHover=0}return e(n,[{key:"init",value:function(){!this.browser.supportsLinkPrefetch()||this.browser.isDataSaverModeOn()||this.browser.isSlowConnection()||(this.regex={excludeUris:RegExp(this.config.excludeUris,"i"),images:RegExp(".("+this.config.imageExt+")$","i"),fileExt:RegExp(".("+this.config.fileExt+")$","i")},this._initListeners(this))}},{key:"_initListeners",value:function(e){-1<this.config.onHoverDelay&&document.addEventListener("mouseover",e.listener.bind(e),e.listenerOptions),document.addEventListener("mousedown",e.listener.bind(e),e.listenerOptions),document.addEventListener("touchstart",e.listener.bind(e),e.listenerOptions)}},{key:"listener",value:function(e){var t=e.target.closest("a"),n=this._prepareUrl(t);if(null!==n)switch(e.type){case"mousedown":case"touchstart":this._addPrefetchLink(n);break;case"mouseover":this._earlyPrefetch(t,n,"mouseout")}}},{key:"_earlyPrefetch",value:function(t,e,n){var i=this,r=setTimeout(function(){if(r=null,0===i.numOnHover)setTimeout(function(){return i.numOnHover=0},1e3);else if(i.numOnHover>i.config.rateThrottle)return;i.numOnHover++,i._addPrefetchLink(e)},this.config.onHoverDelay);t.addEventListener(n,function e(){t.removeEventListener(n,e,{passive:!0}),null!==r&&(clearTimeout(r),r=null)},{passive:!0})}},{key:"_addPrefetchLink",value:function(i){return this.prefetched.add(i.href),new Promise(function(e,t){var n=document.createElement("link");n.rel="prefetch",n.href=i.href,n.onload=e,n.onerror=t,document.head.appendChild(n)}).catch(function(){})}},{key:"_prepareUrl",value:function(e){if(null===e||"object"!==(void 0===e?"undefined":r(e))||!1 in e||-1===["http:","https:"].indexOf(e.protocol))return null;var t=e.href.substring(0,this.config.siteUrl.length),n=this._getPathname(e.href,t),i={original:e.href,protocol:e.protocol,origin:t,pathname:n,href:t+n};return this._isLinkOk(i)?i:null}},{key:"_getPathname",value:function(e,t){var n=t?e.substring(this.config.siteUrl.length):e;return n.startsWith("/")||(n="/"+n),this._shouldAddTrailingSlash(n)?n+"/":n}},{key:"_shouldAddTrailingSlash",value:function(e){return this.config.usesTrailingSlash&&!e.endsWith("/")&&!this.regex.fileExt.test(e)}},{key:"_isLinkOk",value:function(e){return null!==e&&"object"===(void 0===e?"undefined":r(e))&&(!this.prefetched.has(e.href)&&e.origin===this.config.siteUrl&&-1===e.href.indexOf("?")&&-1===e.href.indexOf("#")&&!this.regex.excludeUris.test(e.href)&&!this.regex.images.test(e.href))}}],[{key:"run",value:function(){"undefined"!=typeof RocketPreloadLinksConfig&&new n(new RocketBrowserCompatibilityChecker({capture:!0,passive:!0}),RocketPreloadLinksConfig).init()}}]),n}();t.run(); }()); </script> <!--[if lt IE 9]> <script type='text/javascript' src='https://www.electricalclassroom.com/wp-content/themes/oceanwp/assets/js/third/html5.min.js?ver=2.0.7' id='html5shiv-js'></script> <![endif]--> <script type="text/javascript" id="elementor-pro-frontend-js-before"> var ElementorProFrontendConfig = {"ajaxurl":"https:\/\/web.archive.org\/web\/20210422144856\/https:\/\/www.electricalclassroom.com\/wp-admin\/admin-ajax.php","nonce":"276ebf9b2d","urls":{"assets":"https:\/\/web.archive.org\/web\/20210422144856\/https:\/\/www.electricalclassroom.com\/wp-content\/plugins\/elementor-pro\/assets\/"},"i18n":{"toc_no_headings_found":"No headings were found on this page."},"shareButtonsNetworks":{"facebook":{"title":"Facebook","has_counter":true},"twitter":{"title":"Twitter"},"google":{"title":"Google+","has_counter":true},"linkedin":{"title":"LinkedIn","has_counter":true},"pinterest":{"title":"Pinterest","has_counter":true},"reddit":{"title":"Reddit","has_counter":true},"vk":{"title":"VK","has_counter":true},"odnoklassniki":{"title":"OK","has_counter":true},"tumblr":{"title":"Tumblr"},"digg":{"title":"Digg"},"skype":{"title":"Skype"},"stumbleupon":{"title":"StumbleUpon","has_counter":true},"mix":{"title":"Mix"},"telegram":{"title":"Telegram"},"pocket":{"title":"Pocket","has_counter":true},"xing":{"title":"XING","has_counter":true},"whatsapp":{"title":"WhatsApp"},"email":{"title":"Email"},"print":{"title":"Print"}},"facebook_sdk":{"lang":"en_US","app_id":""},"lottie":{"defaultAnimationUrl":"https:\/\/web.archive.org\/web\/20210422144856\/https:\/\/www.electricalclassroom.com\/wp-content\/plugins\/elementor-pro\/modules\/lottie\/assets\/animations\/default.json"}}; </script> <script type="text/javascript" id="elementor-frontend-js-before"> var elementorFrontendConfig = {"environmentMode":{"edit":false,"wpPreview":false,"isScriptDebug":false,"isImprovedAssetsLoading":false},"i18n":{"shareOnFacebook":"Share on Facebook","shareOnTwitter":"Share on Twitter","pinIt":"Pin it","download":"Download","downloadImage":"Download image","fullscreen":"Fullscreen","zoom":"Zoom","share":"Share","playVideo":"Play Video","previous":"Previous","next":"Next","close":"Close"},"is_rtl":false,"breakpoints":{"xs":0,"sm":480,"md":768,"lg":1025,"xl":1440,"xxl":1600},"version":"3.1.4","is_static":false,"experimentalFeatures":{"form-submissions":true},"urls":{"assets":"https:\/\/web.archive.org\/web\/20210422144856\/https:\/\/www.electricalclassroom.com\/wp-content\/plugins\/elementor\/assets\/"},"settings":{"page":[],"editorPreferences":[]},"kit":{"global_image_lightbox":"yes","lightbox_enable_counter":"yes","lightbox_enable_fullscreen":"yes","lightbox_enable_zoom":"yes","lightbox_enable_share":"yes","lightbox_title_src":"title","lightbox_description_src":"description"},"post":{"id":3555,"title":"What%20is%20kA%20rating%20of%20MCB%20and%20MCCB%3F","excerpt":"","featuredImage":"https:\/\/web.archive.org\/web\/20210422144856\/https:\/\/www.electricalclassroom.com\/wp-content\/uploads\/2020\/02\/circuit-breakers-marking-2.png"}}; </script> <script>window.lazyLoadOptions={elements_selector:"img[data-lazy-src],.rocket-lazyload,iframe[data-lazy-src]",data_src:"lazy-src",data_srcset:"lazy-srcset",data_sizes:"lazy-sizes",class_loading:"lazyloading",class_loaded:"lazyloaded",threshold:300,callback_loaded:function(element){if(element.tagName==="IFRAME"&&element.dataset.rocketLazyload=="fitvidscompatible"){if(element.classList.contains("lazyloaded")){if(typeof window.jQuery!="undefined"){if(jQuery.fn.fitVids){jQuery(element).parent().fitVids()}}}}}};window.addEventListener('LazyLoad::Initialized',function(e){var lazyLoadInstance=e.detail.instance;if(window.MutationObserver){var observer=new MutationObserver(function(mutations){var image_count=0;var iframe_count=0;var rocketlazy_count=0;mutations.forEach(function(mutation){for(i=0;i<mutation.addedNodes.length;i++){if(typeof mutation.addedNodes[i].getElementsByTagName!=='function'){continue} if(typeof mutation.addedNodes[i].getElementsByClassName!=='function'){continue} images=mutation.addedNodes[i].getElementsByTagName('img');is_image=mutation.addedNodes[i].tagName=="IMG";iframes=mutation.addedNodes[i].getElementsByTagName('iframe');is_iframe=mutation.addedNodes[i].tagName=="IFRAME";rocket_lazy=mutation.addedNodes[i].getElementsByClassName('rocket-lazyload');image_count+=images.length;iframe_count+=iframes.length;rocketlazy_count+=rocket_lazy.length;if(is_image){image_count+=1} if(is_iframe){iframe_count+=1}}});if(image_count>0||iframe_count>0||rocketlazy_count>0){lazyLoadInstance.update()}});var b=document.getElementsByTagName("body")[0];var config={childList:!0,subtree:!0};observer.observe(b,config)}},!1)</script><script data-no-minify="1" async="" src="https://web.archive.org/web/20210422144856js_/https://www.electricalclassroom.com/wp-content/plugins/wp-rocket/assets/js/lazyload/16.1/lazyload.min.js"></script><script>"use strict";var wprRemoveCPCSS=function wprRemoveCPCSS(){var elem;document.querySelector('link[data-rocket-async="style"][rel="preload"]')?setTimeout(wprRemoveCPCSS,200):(elem=document.getElementById("rocket-critical-css"))&&"remove"in elem&&elem.remove()};window.addEventListener?window.addEventListener("load",wprRemoveCPCSS):window.attachEvent&&window.attachEvent("onload",wprRemoveCPCSS);</script><script src="https://web.archive.org/web/20210422144856js_/https://www.electricalclassroom.com/wp-content/cache/min/1/8250700b6bf17ac420044197a6a5d855.js" data-minify="1" defer=""></script><noscript><link rel="stylesheet" href="https://web.archive.org/web/20210422144856cs_/https://www.electricalclassroom.com/wp-content/cache/min/1/6bef0d71236b876ebbd3ae64e42bebd3.css" media="all" data-minify="1"/><link rel="stylesheet" id="google-fonts-1-css" href="https://web.archive.org/web/20210422144856cs_/https://fonts.googleapis.com/css?family=Roboto%3A100%2C100italic%2C200%2C200italic%2C300%2C300italic%2C400%2C400italic%2C500%2C500italic%2C600%2C600italic%2C700%2C700italic%2C800%2C800italic%2C900%2C900italic%7CRoboto+Slab%3A100%2C100italic%2C200%2C200italic%2C300%2C300italic%2C400%2C400italic%2C500%2C500italic%2C600%2C600italic%2C700%2C700italic%2C800%2C800italic%2C900%2C900italic%7CAmita%3A100%2C100italic%2C200%2C200italic%2C300%2C300italic%2C400%2C400italic%2C500%2C500italic%2C600%2C600italic%2C700%2C700italic%2C800%2C800italic%2C900%2C900italic&amp;ver=5.7.1&amp;display=swap" type="text/css" media="all"/></noscript> <script type="text/javascript" style="display:none;" async> __ez.queue.addFile('edmonton.php', '/detroitchicago/edmonton.webp?a=a&cb=0&shcb=34', true, ['/detroitchicago/minneapolis.js'], true, false, false, false); __ez.queue.addFile('jellyfish.php', '/porpoiseant/jellyfish.webp?a=a&cb=0&shcb=34', false, [], true, false, false, false); </script> <script>var _audins_dom="electricalclassroom_com",_audins_did=142070;__ez.queue.addDelayFunc("audins.js","__ez.script.add", "//web.archive.org/web/20210422144856/https://go.ezoic.net/detroitchicago/audins.js?cb=194-0");</script><noscript><div style="display:none;"><img src="//web.archive.org/web/20210422144856im_/https://pixel.quantserve.com/pixel/p-31iz6hfFutd16.gif?labels=Domain.electricalclassroom_com,DomainId.142070" border="0" height="1" width="1" alt="Quantcast"/></div></noscript> <script type="text/javascript" data-cfasync="false"></script> <script>__ez.queue.addFile('/tardisrocinante/vitals.js', '/tardisrocinante/vitals.js?gcb=0&cb=3', false, ['/detroitchicago/minneapolis.js'], true, false, true, false);</script></body></html><!-- FILE ARCHIVED ON 14:48:56 Apr 22, 2021 AND RETRIEVED FROM THE INTERNET ARCHIVE ON 17:52:55 Nov 28, 2024. JAVASCRIPT APPENDED BY WAYBACK MACHINE, COPYRIGHT INTERNET ARCHIVE. ALL OTHER CONTENT MAY ALSO BE PROTECTED BY COPYRIGHT (17 U.S.C. SECTION 108(a)(3)). --> <!-- playback timings (ms): captures_list: 2.759 exclusion.robots: 0.055 exclusion.robots.policy: 0.033 esindex: 0.019 cdx.remote: 12.346 LoadShardBlock: 94.077 (3) PetaboxLoader3.datanode: 60.99 (4) PetaboxLoader3.resolve: 92.298 (2) load_resource: 107.639 -->

Pages: 1 2 3 4 5 6 7 8 9 10