Surge Protective Device Selection Guide

<!DOCTYPE html> <html lang="en"> <head> <title>Surge Protective Device Selection Guide - Littelfuse</title> <meta http-equiv="content-type" content="text/html; charset=utf-8"> <meta name="viewport" content="width=device-width, initial-scale=1"> <meta name="description" content="The Surge Protective Device Selection Guide from Littelfuse helps calculate the right SPDs for your system to avoid overvoltages damaging to equipment and costly damage & downtime."> <link rel="apple-touch-icon" sizes="180x180" href="/Common/SPDSelectionGuide/apple-touch-icon.png"/> <link rel="icon" type="image/png" sizes="32x32" href="/Common/SPDSelectionGuide/favicon-32x32.png"> <link rel="icon" type="image/png" sizes="16x16" href="/Common/SPDSelectionGuide/favicon-16x16.png"> <link rel="manifest" href="/Common/SPDSelectionGuide/site.webmanifest"> <link rel="stylesheet" href="/Common/SPDSelectionGuide/styles.css"> <link rel="contents" type="application/json" href="/~/media/json-files/spd-selection-guide.json" /> </head> <body> <header class="header"> <a href="https://www.littelfuse.com/" target="_blank" aria-label="logo"><div class="logo"></div></a> </header> <main> <div class="hero"> <div class="container"> <div class="main-image"></div> </div> </div> <div class="description"> <div class="container"> <h1>Surge Protective Device Selection Guide</h1> <p>SPDs need to be sized correctly. If they are sized too low, the system could be susceptible to temporary overvoltages. It can also decrease the SPD life expectancy. If they are sized too high, it could be damaging to equipment.</p> <p>To determine which SPD size should be used for the system, you must know the reference to ground as well as the type of voltage that is present. The formula to use depends on the type of system.</p> <p>This calculator will determine an optimal MCOV size for your specific system.</p> <p><strong>Get started</strong></p> </div> </div> <div class="selection" role="navigation"> <div class="container"> <div id="voltage" class="selection-question voltage show"> <h2>What is the line-to-line voltage?</h2> <div class="selection-content"> <div><button type="button" class="button btn-link" data-id="120">120</button></div> <div><button type="button" class="button btn-link" data-id="208">208</button></div> <div><button type="button" class="button btn-link" data-id="230">230</button></div> <div><button type="button" class="button btn-link" data-id="240">240</button></div> <div><button type="button" class="button btn-link" data-id="400">400</button></div> <div><button type="button" class="button btn-link" data-id="415">415</button></div> <div><button type="button" class="button btn-link" data-id="480">480</button></div> <div><button type="button" class="button btn-link" data-id="600">600</button></div> <div><button type="button" class="button btn-link" data-id="690">690</button></div> </div> </div> <div id="conductors" class="selection-question conductors hidden"> <h2>How many conductors are there?</h2> <div class="selection-content"> <div class="no-select-1"><button type="button" class="button btn-link" data-id="1">1</button></div> <div class="no-select-2"><button type="button" class="button btn-link" data-id="2">2</button></div> <div class="no-select-3"><button type="button" class="button btn-link" data-id="3">3</button></div> </div> </div> <div id="grounded" class="selection-question grounded hidden"> <h2>Grounded or Ungrounded?</h2> <div class="selection-content"> <div class="no-select-G"><button type="button" class="button btn-link" data-id="G" data-id-fullname="Grounded">Grounded</button></div> <div class="no-select-IT"><button type="button" class="button btn-link" data-id="IT" data-id-fullname="IT">IT</button></div> <div class="no-select-TNC"><button type="button" class="button btn-link" data-id="TNC" data-id-fullname="TN-C">TN-C</button></div> <div class="no-select-TNS"><button type="button" class="button btn-link" data-id="TNS" data-id-fullname="TN-S">TN-S</button></div> <div class="no-select-UG"><button type="button" class="button btn-link" data-id="UG" data-id-fullname="Ungrounded">Ungrounded</button></div> <div class="no-select-UNK"><button type="button" class="button btn-link" data-id="UNK" data-id-fullname="Unknown">Unknown</button></div> </div> </div> <div id="neutral" class="selection-question neutral hidden"> <h2>Is there a neutral?</h2> <div class="selection-content"> <div class="no-select-Y"><button type="button" class="button btn-link" data-id="Y">Yes</button></div> <div class="no-select-N"><button type="button" class="button btn-link" data-id="N">No</button></div> </div> </div> <div id="install" class="selection-question install hidden"> <h2>Is the SPD going to be installed?</h2> <div class="selection-content"> <div class="no-select-LG"><button type="button" class="button btn-link" data-id="LG">L-G</button></div> <div class="no-select-LG_NG"><button type="button" class="button btn-link" data-id="LG_NG">L-G & N-G</button></div> <div class="no-select-LN"><button type="button" class="button btn-link" data-id="LN">L-N</button></div> <div class="no-select-LN_LPE"><button type="button" class="button btn-link" data-id="LN_LPE">L-N & L-PE</button></div> <div class="no-select-LNG"><button type="button" class="button btn-link" data-id="LNG">L-N-G</button></div> <div class="no-select-LNPE"><button type="button" class="button btn-link" data-id="LNPE">L-N-PE</button></div> <div class="no-select-LPE"><button type="button" class="button btn-link" data-id="LPE">L-PE</button></div> <div class="no-select-LPEN"><button type="button" class="button btn-link" data-id="LPEN">L-PEN</button></div> <div class="no-select-LPE_NPE"><button type="button" class="button btn-link" data-id="LPE_NPE">L-PE & N-PE</button></div> </div> </div> <div id="remote" class="selection-question remote hidden"> <h2>Is remote indication required?</h2> <div class="selection-content"> <div class="no-select-Y"><button type="button" class="button btn-link" data-id="Y">Yes</button></div> <div class="no-select-N"><button type="button" class="button btn-link" data-id="N">No</button></div> </div> </div> <div class="indicator"> <div class="indicator-wrapper"> <div class="indicator-dots selected" data-select-option="voltage"></div> <div class="indicator-dots" data-select-option="conductors"></div> <div class="indicator-dots" data-select-option="grounded"></div> <div class="indicator-dots" data-select-option="neutral"></div> <div class="indicator-dots" data-select-option="install"></div> <div class="indicator-dots" data-select-option="remote"></div> </div> </div> </div> </div> <div id="results" class="results hidden"> <div class="container"> <h2>Results<span id="resultCheckID"></span></h2> <div class="divider"></div> <div class="results-selections"> <span class="hdr">Selections:</span> <div> <span id="select-voltage"></span> <span>|</span> <span id="select-conductors"></span> <span>|</span> <span id="select-grounded"></span> <span class="bar">|</span> </div> <div> <span id="select-neutral">Neutral: YES</span> <span>|</span> <span id="select-install"></span> <span>|</span> <span id="select-remote"></span> </div> </div> <div class="results-container"> <div class="results-filter"> <div class="results-title"> <h3>Reference to Ground</h3> </div> <div class="results-content"> <div class="info"><span id="results-rtg"></span></div> </div> </div> <div class="results-filter"> <div class="results-title"> <h3>MCOV</h3> <span>(Maximum Continuous Operating Voltage)</span> </div> <div class="results-content"> <div class="info"><span id="results-mcov"></span></div> </div> </div> <div class="results-filter"> <div class="results-title"> <h3>% Overvoltage</h3> <span>(ideally between 15% and 25%)</span> </div> <div class="results-content"> <div class="info"><span id="results-overvoltage"></span></div> <div> <p id="hdr-caution" class="caution-text hidden"></p> </div> </div> </div> </div> <h3 id="hdr-configuration" class="hdr-config">Configuration based on the number of conductors</h3> <div class="product-details clearfix"> <div class="product-image"></div> <h4 id="description-title"></h4> <p id="description-text"></p> <div class="customer-service-contacts hidden"> <div> <h5>Sales Support</h5> <p><a href="tel:1-800-227-0029">1-800-227-0029</a><br> (US & CA only)<br> <a href="mailto:PG_CSG@littelfuse.com">PG_CSG@littelfuse.com</a> </p> </div> <div> <h5>Technical Support</h5> <p><a href="tel:1-800-832-3873">+1 800 832 3873</a><br> (US & CA only)<br> <a href="mailto:Relays@littelfuse.com">Relays@littelfuse.com</a> </p> </div> </div> <div class="button-group"> <a href="#" id="btn-datasheet" target="_blank" class="button 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Surge Protective Device Selection Guide - Littelfuse