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class="page-header-title clr" itemprop="headline">Motor locked rotor current calculator</h2> <div class="site-breadcrumbs clr position-under-title"><a href="https://web.archive.org/web/20210422133009/https://www.electricalclassroom.com/">Home</a><span class="separator"> - </span><a href="https://web.archive.org/web/20210422133009/https://www.electricalclassroom.com/category/tools/">Tools</a><span class="separator"> - </span><span class="last">Motor locked rotor current calculator</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-6383"> <header class="entry-header clr"> <h1 class="single-post-title entry-title" itemprop="headline">Motor locked rotor current calculator</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> <h2>What is ‘locked rotor current’?</h2> <p>A motor at rest acts as if its rotor is locked. The locked rotor current and the starting current of a motor are one and the same. It is the starting current drawn by a motor when full nominal voltage is applied to its terminals. Here is a simple locked rotor current calculator. Enter the motor rated power, nominal voltage and NEMA code and click on calculate button.</p> <h2>Locked rotor current calculator</h2> <div class="wp-block-group"><div class="wp-block-group__inner-container"> <div class="wp-block-columns are-vertically-aligned-center"> <div class="wp-block-column is-vertically-aligned-center"> <div class="wp-block-group has-background" style="background-color:#bae0f7"><div class="wp-block-group__inner-container"> <table><tbody><tr><td>Nominal voltage</td><td><input type="number" id="volt" style="width: 80px;" value="415"/>V</td></tr><tr><td>Motor rated power</td><td> <input type="number" id="kw" style="width: 80px;" value="220"/> <select id="kwtype" onchange="calculate()"><option value="1">HP</option><option value="2">kW</option> </select></td></tr><tr><td></td><td> <select id="phase" onchange="calculate()"><option value="1">Single Phase</option><option value="3" selected="">Three Phase</option> </select></td></tr><tr><td>Design Code</td><td><select id="code" onchange="calculate()"><option value="3.14">A</option><option value="3.54">B</option><option value="3.99">C</option><option value="4.49" selected="">D</option><option value="4.99">E</option><option value="5.59">F</option><option value="6.29">G</option><option value="7.09">H</option><option value="7.99">J</option><option value="8.99">K</option><option value="9.99">L</option><option value="11.19">M</option><option value="12.49">N</option><option value="13.99">P</option><option value="15.99">R</option><option value="17.99">S</option><option value="19.99">T</option><option value="22.39">U</option><option value="22.4">V</option> </select></td></tr><tr><td></td><td><button onclick="calculate()">Calculate</button></td></tr><tr><td colspan="3" style="text-align: center;"><h2>Calculated Values</h2></td></tr><tr><td>Locked rotor current</td><td><input id="lrc" readonly="readonly" style="width: 80px;"/>A</td></tr></tbody></table> </div></div> </div> <div class="wp-block-column is-vertically-aligned-center"> <script data-rocketlazyloadscript="https://pagead2.googlesyndication.com/pagead/js/adsbygoogle.js" async=""></script> <ins class="adsbygoogle" style="display:inline-block;width:300px;height:600px" data-ad-client="ca-pub-4567036280313464" data-ad-slot="4839624210"></ins> <script> (adsbygoogle = window.adsbygoogle || []).push({}); </script> </div> </div> </div></div> <h2>How to use the calculator:</h2> <p>The above tool requires following data for calculation:</p> <ol><li>Motor Type – Single-phase or three-phase. (Mandatory)</li><li>Motor rated power in HP or kW. (Mandatory)</li><li>Input supply voltage. (Mandatory)</li><li>NEMA code. (Mandatory)</li></ol> <p>After entering the required data, click on the “Calculate” button to find out the locked rotor current of the motor.</p> <div class="wp-block-image"><figure class="aligncenter size-large is-resized"><a href="https://web.archive.org/web/20210422133009/https://www.electricalclassroom.com/wp-content/uploads/2020/12/Induction-motor-for-star-delta-starter.png"><picture class="wp-image-5593"> <source type="image/webp" data-lazy-srcset="https://www.electricalclassroom.com/wp-content/uploads/2020/12/Induction-motor-for-star-delta-starter.png.webp 600w, https://www.electricalclassroom.com/wp-content/uploads/2020/12/Induction-motor-for-star-delta-starter-300x210.png.webp 300w" srcset="data:image/svg+xml,%3Csvg%20xmlns='http://www.w3.org/2000/svg'%20viewBox='0%200%20353%20247'%3E%3C/svg%3E" data-lazy-sizes="(max-width: 353px) 100vw, 353px"/> <img src="data:image/svg+xml,%3Csvg%20xmlns='http://www.w3.org/2000/svg'%20viewBox='0%200%20353%20247'%3E%3C/svg%3E" alt="Locked rotor current calculator" width="353" height="247" data-lazy-srcset="https://web.archive.org/web/20210422133009/https://www.electricalclassroom.com/wp-content/uploads/2020/12/Induction-motor-for-star-delta-starter.png 600w, https://www.electricalclassroom.com/wp-content/uploads/2020/12/Induction-motor-for-star-delta-starter-300x210.png 300w" data-lazy-sizes="(max-width: 353px) 100vw, 353px" data-lazy-src="https://web.archive.org/web/20210422133009/https://www.electricalclassroom.com/wp-content/uploads/2020/12/Induction-motor-for-star-delta-starter.png"/> </picture> <noscript><picture class="wp-image-5593"> <source type="image/webp" srcset="https://web.archive.org/web/20210422133009im_/https://www.electricalclassroom.com/wp-content/uploads/2020/12/Induction-motor-for-star-delta-starter.png.webp 600w, https://web.archive.org/web/20210422133009im_/https://www.electricalclassroom.com/wp-content/uploads/2020/12/Induction-motor-for-star-delta-starter-300x210.png.webp 300w" sizes="(max-width: 353px) 100vw, 353px"/> <img src="https://web.archive.org/web/20210422133009im_/https://www.electricalclassroom.com/wp-content/uploads/2020/12/Induction-motor-for-star-delta-starter.png" alt="Locked rotor current calculator" width="353" height="247" srcset="https://web.archive.org/web/20210422133009im_/https://www.electricalclassroom.com/wp-content/uploads/2020/12/Induction-motor-for-star-delta-starter.png 600w, https://web.archive.org/web/20210422133009im_/https://www.electricalclassroom.com/wp-content/uploads/2020/12/Induction-motor-for-star-delta-starter-300x210.png 300w" sizes="(max-width: 353px) 100vw, 353px"/> </picture> </noscript></a></figure></div> <p>The appropriate selection of fuses, circuit breakers, overload relay, cables, and other switchgear is necessary to protect the motor from damages. The motor full load current forms the basis for the selection of all these equipment.</p> <h2>Motor FLC calculation</h2> <h3>For single phase AC motors</h3> <p>For single-phase motors, when kW is known:</p> <p class="ql-center-displayed-equation" style="line-height: 44px;"><span class="ql-right-eqno"> </span><span class="ql-left-eqno"> </span><img src="data:image/svg+xml,%3Csvg%20xmlns='http://www.w3.org/2000/svg'%20viewBox='0%200%20293%2044'%3E%3C/svg%3E" height="44" width="293" class="ql-img-displayed-equation quicklatex-auto-format" alt="\[ LRC =\frac{P_k_W \times 1341 \times (KVA/HP)}{Voltage} \]" title="Rendered by QuickLaTeX.com" data-lazy-src="https://web.archive.org/web/20210422133009/https://www.electricalclassroom.com/wp-content/ql-cache/quicklatex.com-c35058807279476dcf043809e70fd092_l3.png"/><noscript><img src="https://web.archive.org/web/20210422133009im_/https://www.electricalclassroom.com/wp-content/ql-cache/quicklatex.com-c35058807279476dcf043809e70fd092_l3.png" height="44" width="293" class="ql-img-displayed-equation quicklatex-auto-format" alt="\[ LRC =\frac{P_k_W \times 1341 \times (KVA/HP)}{Voltage} \]" title="Rendered by QuickLaTeX.com"/></noscript></p> <p>For single-phase motors, when HP is known:</p> <p class="ql-center-displayed-equation" style="line-height: 44px;"><span class="ql-right-eqno"> </span><span class="ql-left-eqno"> </span><img src="data:image/svg+xml,%3Csvg%20xmlns='http://www.w3.org/2000/svg'%20viewBox='0%200%20285%2044'%3E%3C/svg%3E" height="44" width="285" class="ql-img-displayed-equation quicklatex-auto-format" alt="\[ LRC =\frac{P_h_p \times 1000 \times (KVA/HP)}{Voltage} \]" title="Rendered by QuickLaTeX.com" data-lazy-src="https://web.archive.org/web/20210422133009/https://www.electricalclassroom.com/wp-content/ql-cache/quicklatex.com-71b9617698c8d397f4dc5b9fa7084e7e_l3.png"/><noscript><img src="https://web.archive.org/web/20210422133009im_/https://www.electricalclassroom.com/wp-content/ql-cache/quicklatex.com-71b9617698c8d397f4dc5b9fa7084e7e_l3.png" height="44" width="285" class="ql-img-displayed-equation quicklatex-auto-format" alt="\[ LRC =\frac{P_h_p \times 1000 \times (KVA/HP)}{Voltage} \]" title="Rendered by QuickLaTeX.com"/></noscript></p> <h3>For Three phase AC motors</h3> <p>For three-phase motors, when kW is known:</p> <p class="ql-center-displayed-equation" style="line-height: 44px;"><span class="ql-right-eqno"> </span><span class="ql-left-eqno"> </span><img src="data:image/svg+xml,%3Csvg%20xmlns='http://www.w3.org/2000/svg'%20viewBox='0%200%20283%2044'%3E%3C/svg%3E" height="44" width="283" class="ql-img-displayed-equation quicklatex-auto-format" alt="\[ LRC =\frac{P_k_W \times 774 \times (KVA/HP)}{Voltage} \]" title="Rendered by QuickLaTeX.com" data-lazy-src="https://web.archive.org/web/20210422133009/https://www.electricalclassroom.com/wp-content/ql-cache/quicklatex.com-0ba912672aa74b75ac7ba05080a91004_l3.png"/><noscript><img src="https://web.archive.org/web/20210422133009im_/https://www.electricalclassroom.com/wp-content/ql-cache/quicklatex.com-0ba912672aa74b75ac7ba05080a91004_l3.png" height="44" width="283" class="ql-img-displayed-equation quicklatex-auto-format" alt="\[ LRC =\frac{P_k_W \times 774 \times (KVA/HP)}{Voltage} \]" title="Rendered by QuickLaTeX.com"/></noscript></p> <p>For single-phase motors, when HP is known:</p> <p class="ql-center-displayed-equation" style="line-height: 44px;"><span class="ql-right-eqno"> </span><span class="ql-left-eqno"> </span><img src="data:image/svg+xml,%3Csvg%20xmlns='http://www.w3.org/2000/svg'%20viewBox='0%200%20275%2044'%3E%3C/svg%3E" height="44" width="275" class="ql-img-displayed-equation quicklatex-auto-format" alt="\[ LRC =\frac{P_h_p \times 577 \times (KVA/HP)}{Voltage} \]" title="Rendered by QuickLaTeX.com" data-lazy-src="https://web.archive.org/web/20210422133009/https://www.electricalclassroom.com/wp-content/ql-cache/quicklatex.com-330e48add9aa1c04fcbedd37ef3173d3_l3.png"/><noscript><img src="https://web.archive.org/web/20210422133009im_/https://www.electricalclassroom.com/wp-content/ql-cache/quicklatex.com-330e48add9aa1c04fcbedd37ef3173d3_l3.png" height="44" width="275" class="ql-img-displayed-equation quicklatex-auto-format" alt="\[ LRC =\frac{P_h_p \times 577 \times (KVA/HP)}{Voltage} \]" title="Rendered by QuickLaTeX.com"/></noscript></p> <p>Where,</p> <ul><li><strong>Voltage:</strong> The phase-to-phase voltage for a 3-phase supply.</li><li><strong>Rating:</strong> The power rating of the motor in kW.</li><li><strong>KVA/HP</strong>: Maximum value corresponding to the NEMA code. </li><li><strong>Efficiency (η)</strong>: The efficiency of the motor. </li></ul> <h2>Locked rotor KVA per Horsepower</h2> <p>The National Electrical Manufacturer’s Association (NEMA) has designated code letters to classify motors by the rotor kVA per horse power. Here is the tabulation of those code letters and kVA per horsepower values.</p> <figure class="wp-block-table is-style-stripes"><table class="has-fixed-layout"><thead><tr><th class="has-text-align-center" data-align="center">Letter designation</th><th class="has-text-align-center" data-align="center">(KVA/HP) Minimum</th><th class="has-text-align-center" data-align="center">(KVA/HP) Maximum</th></tr></thead><tbody><tr><td class="has-text-align-center" data-align="center">A</td><td class="has-text-align-center" data-align="center">1</td><td class="has-text-align-center" data-align="center">3.14</td></tr><tr><td class="has-text-align-center" data-align="center">B</td><td class="has-text-align-center" data-align="center">3.15</td><td class="has-text-align-center" data-align="center">3.54</td></tr><tr><td class="has-text-align-center" data-align="center">C</td><td class="has-text-align-center" data-align="center">3.55</td><td class="has-text-align-center" data-align="center">3.99</td></tr><tr><td class="has-text-align-center" data-align="center">D</td><td class="has-text-align-center" data-align="center">4</td><td class="has-text-align-center" data-align="center">4.49</td></tr><tr><td class="has-text-align-center" data-align="center">E</td><td class="has-text-align-center" data-align="center">4.5</td><td class="has-text-align-center" data-align="center">4.99</td></tr><tr><td class="has-text-align-center" data-align="center">F</td><td class="has-text-align-center" data-align="center">5</td><td class="has-text-align-center" data-align="center">2.59</td></tr><tr><td class="has-text-align-center" data-align="center">G</td><td class="has-text-align-center" data-align="center">2.6</td><td class="has-text-align-center" data-align="center">6.29</td></tr><tr><td class="has-text-align-center" data-align="center">H</td><td class="has-text-align-center" data-align="center">6.3</td><td class="has-text-align-center" data-align="center">7.09</td></tr><tr><td class="has-text-align-center" data-align="center">I</td><td class="has-text-align-center" data-align="center">7.1</td><td class="has-text-align-center" data-align="center">7.99</td></tr><tr><td class="has-text-align-center" data-align="center">K</td><td class="has-text-align-center" data-align="center">8</td><td class="has-text-align-center" data-align="center">8.99</td></tr><tr><td class="has-text-align-center" data-align="center">L</td><td class="has-text-align-center" data-align="center">9</td><td class="has-text-align-center" data-align="center">9.99</td></tr><tr><td class="has-text-align-center" data-align="center">M</td><td class="has-text-align-center" data-align="center">10</td><td class="has-text-align-center" data-align="center">11.19</td></tr><tr><td class="has-text-align-center" data-align="center">N</td><td class="has-text-align-center" data-align="center">11.2</td><td class="has-text-align-center" data-align="center">12.49</td></tr><tr><td class="has-text-align-center" data-align="center">P</td><td class="has-text-align-center" data-align="center">12.5</td><td class="has-text-align-center" data-align="center">13.99</td></tr><tr><td class="has-text-align-center" data-align="center">R</td><td class="has-text-align-center" data-align="center">14</td><td class="has-text-align-center" data-align="center">15.99</td></tr><tr><td class="has-text-align-center" data-align="center">S</td><td class="has-text-align-center" data-align="center">16</td><td class="has-text-align-center" data-align="center">17.99</td></tr><tr><td class="has-text-align-center" data-align="center">T</td><td class="has-text-align-center" data-align="center">18</td><td class="has-text-align-center" data-align="center">19.99</td></tr><tr><td class="has-text-align-center" data-align="center">U</td><td class="has-text-align-center" data-align="center">20</td><td class="has-text-align-center" data-align="center">22.39</td></tr><tr><td class="has-text-align-center" data-align="center">V</td><td class="has-text-align-center" data-align="center">22.4</td><td class="has-text-align-center" data-align="center"> –</td></tr></tbody></table><figcaption>For further details refer: <a href="https://web.archive.org/web/20210422133009/https://www.engineeringtoolbox.com/locked-rotor-code-d_917.html" class="rank-math-link" target="_blank" rel="noopener">https://www.engineeringtoolbox.com/locked-rotor-code-d_917.html</a></figcaption></figure> <h2>Other calculators:</h2> <ul><li><a href="/web/20210422133009/https://www.electricalclassroom.com/synchronous-speed-calculator/" class="rank-math-link">Synchronous speed calculator</a></li><li><a href="/web/20210422133009/https://www.electricalclassroom.com/induction-motor-slip-calculator" class="rank-math-link">Induction motor slip</a></li><li><a href="/web/20210422133009/https://www.electricalclassroom.com/full-load-motor-torque-calculator/" 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