{"id":31095,"date":"2026-09-16T09:18:59","date_gmt":"2026-09-16T01:18:59","guid":{"rendered":"https:\/\/www.cnspd.com\/?p=31095"},"modified":"2026-09-16T09:22:59","modified_gmt":"2026-09-16T01:22:59","slug":"iec-60947-6-12026-ats-standard-guide-for-buyers","status":"publish","type":"post","link":"https:\/\/www.cnspd.com\/fr\/iec-60947-6-1-ats-standard\/","title":{"rendered":"IEC 60947-6-1:2026 \u2014 Guide standard ATS \u00e0 l'intention des acheteurs"},"content":{"rendered":"\t\t<div data-elementor-type=\"wp-post\" data-elementor-id=\"31095\" class=\"elementor elementor-31095\" data-elementor-post-type=\"post\">\n\t\t\t\t<div class=\"elementor-element elementor-element-fd4718a e-flex e-con-boxed e-con e-parent\" data-id=\"fd4718a\" data-element_type=\"container\" data-e-type=\"container\">\n\t\t\t\t\t<div class=\"e-con-inner\">\n\t\t\t\t<div class=\"elementor-element elementor-element-6706692 elementor-widget elementor-widget-html\" data-id=\"6706692\" data-element_type=\"widget\" data-e-type=\"widget\" data-widget_type=\"html.default\">\n\t\t\t\t<div class=\"elementor-widget-container\">\n\t\t\t\t\t<style>\r\n#leeyee-iec60947-guide{\r\n  --ly-blue:#004898;\r\n  --ly-blue-dark:#00386f;\r\n  --ly-blue-soft:#eef5ff;\r\n  --ly-blue-softer:#f7fbff;\r\n  --ly-text:#202b33;\r\n  --ly-muted:#5d6972;\r\n  --ly-border:#d9e4ec;\r\n  --ly-border-strong:#bfd1de;\r\n  --ly-warning:#995b00;\r\n  --ly-warning-bg:#fff8e9;\r\n  --ly-success:#21613a;\r\n  --ly-success-bg:#f1faf4;\r\n  width:100%;\r\n  max-width:860px;\r\n  margin:0 auto;\r\n  padding:8px 20px 58px;\r\n  box-sizing:border-box;\r\n  color:var(--ly-text);\r\n  font-size:17px;\r\n  line-height:1.72;\r\n  overflow-wrap:break-word;\r\n}\r\n\r\n#leeyee-iec60947-guide *,\r\n#leeyee-iec60947-guide *::before,\r\n#leeyee-iec60947-guide *::after{\r\n  box-sizing:border-box;\r\n}\r\n\r\n#leeyee-iec60947-guide p{\r\n  margin:0 0 18px;\r\n}\r\n\r\n#leeyee-iec60947-guide a{\r\n  color:var(--ly-blue);\r\n  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font-size:20px;\r\n}\r\n\r\n#leeyee-iec60947-guide .ly-card p:last-child{\r\n  margin-bottom:0;\r\n}\r\n\r\n#leeyee-iec60947-guide .ly-flow{\r\n  counter-reset:ly-step;\r\n  margin:26px 0 30px;\r\n  padding:0;\r\n  list-style:none;\r\n}\r\n\r\n#leeyee-iec60947-guide .ly-flow li{\r\n  position:relative;\r\n  margin:0;\r\n  padding:0 0 25px 54px;\r\n}\r\n\r\n#leeyee-iec60947-guide .ly-flow li:last-child{\r\n  padding-bottom:0;\r\n}\r\n\r\n#leeyee-iec60947-guide .ly-flow li::before{\r\n  counter-increment:ly-step;\r\n  content:counter(ly-step);\r\n  position:absolute;\r\n  top:1px;\r\n  left:0;\r\n  width:34px;\r\n  height:34px;\r\n  border-radius:50%;\r\n  background:var(--ly-blue);\r\n  color:#fff;\r\n  line-height:34px;\r\n  text-align:center;\r\n  font-weight:700;\r\n}\r\n\r\n#leeyee-iec60947-guide .ly-flow li::after{\r\n  content:\"\";\r\n  position:absolute;\r\n  top:39px;\r\n  bottom:3px;\r\n  left:16px;\r\n  width:2px;\r\n  background:#cbdce8;\r\n}\r\n\r\n#leeyee-iec60947-guide 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46px;\r\n  padding:28px 24px;\r\n  border:1px solid #cfdeea;\r\n  border-radius:10px;\r\n  background:var(--ly-blue-softer);\r\n  text-align:center;\r\n}\r\n\r\n#leeyee-iec60947-guide .ly-cta p{\r\n  max-width:700px;\r\n  margin:0 auto 18px;\r\n  color:#31424e;\r\n}\r\n\r\n\/* LEEYEE fixed popup CTA styling *\/\r\n#leeyee-iec60947-guide .leeyee-about-btn-light{\r\n  -webkit-appearance:none;\r\n  appearance:none;\r\n  display:inline-flex;\r\n  align-items:center;\r\n  justify-content:center;\r\n  min-height:48px;\r\n  max-width:100%;\r\n  padding:12px 24px;\r\n  border:2px solid #004898;\r\n  border-radius:6px;\r\n  background:#ffffff;\r\n  color:#004898;\r\n  font:inherit;\r\n  font-size:16px;\r\n  line-height:1.35;\r\n  font-weight:700;\r\n  text-align:center;\r\n  text-decoration:none;\r\n  cursor:pointer;\r\n  transition:\r\n    background-color .2s ease,\r\n    color .2s ease,\r\n    border-color .2s ease,\r\n    box-shadow .2s ease,\r\n    transform .2s 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line-height:1.6;\r\n}\r\n\r\n#leeyee-iec60947-guide .ly-term{\r\n  color:var(--ly-blue-dark);\r\n  font-weight:700;\r\n}\r\n\r\n@media (max-width:820px){\r\n  #leeyee-iec60947-guide .ly-grid-3{\r\n    grid-template-columns:1fr;\r\n  }\r\n\r\n  #leeyee-iec60947-guide figure.ly-figure{\r\n    max-width:100%;\r\n  }\r\n}\r\n\r\n@media (max-width:768px){\r\n  #leeyee-iec60947-guide{\r\n    padding:6px 18px 48px;\r\n    font-size:16px;\r\n    line-height:1.7;\r\n  }\r\n\r\n  #leeyee-iec60947-guide h2{\r\n    margin-top:44px;\r\n    font-size:28px;\r\n  }\r\n\r\n  #leeyee-iec60947-guide h3{\r\n    font-size:21px;\r\n  }\r\n\r\n  #leeyee-iec60947-guide .ly-intro{\r\n    font-size:17px;\r\n  }\r\n\r\n  #leeyee-iec60947-guide .ly-quick,\r\n  #leeyee-iec60947-guide .ly-checklist{\r\n    padding:20px;\r\n  }\r\n\r\n  #leeyee-iec60947-guide figure.ly-figure{\r\n    margin-top:24px;\r\n    margin-bottom:28px;\r\n  }\r\n\r\n  #leeyee-iec60947-guide .leeyee-about-btn-light{\r\n    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font-size:25px;\r\n  }\r\n\r\n  #leeyee-iec60947-guide h3{\r\n    font-size:20px;\r\n  }\r\n\r\n  #leeyee-iec60947-guide .ly-quick h2,\r\n  #leeyee-iec60947-guide .ly-checklist h2{\r\n    font-size:24px;\r\n  }\r\n\r\n  #leeyee-iec60947-guide .ly-table-wrap td{\r\n    padding-left:12px;\r\n    padding-top:39px;\r\n  }\r\n\r\n  #leeyee-iec60947-guide .ly-table-wrap td::before{\r\n    top:10px;\r\n    width:calc(100% - 24px);\r\n  }\r\n\r\n  #leeyee-iec60947-guide .ly-flow li{\r\n    padding-left:46px;\r\n  }\r\n}\r\n<\/style>\r\n\r\n<div id=\"leeyee-iec60947-guide\">\r\n\r\n  <p class=\"ly-kicker\">IEC 60947-6-1 ATS Buyer Verification Guide<\/p>\r\n\r\n  <p class=\"ly-intro\">\r\n    IEC 60947-6-1 is the principal IEC product standard for transfer switching equipment used to transfer a load between power sources. For an ATS buyer, however, seeing \u201cIEC 60947-6-1\u201d on a catalogue is only the starting point. A useful technical approval must connect the standard claim to the <strong>exact TSE type, PC\/CB\/CC class, rated voltage and current, utilization category, short-circuit performance, protective-device coordination and documented model scope<\/strong>.<sup><a href=\"#ref-1\">[1]<\/a><\/sup>\r\n  <\/p>\r\n\r\n  <p>\r\n    This guide explains <strong>IEC 60947-6-1:2026<\/strong> from the perspective of importers, distributors, panel builders, electrical contractors, project procurement teams and OEM buyers. It does not reproduce the standard. Instead, it turns the important requirements into a practical verification process for automatic transfer switch purchasing.\r\n  <\/p>\r\n\r\n  <div class=\"ly-scope\">\r\n    <strong>Page boundary:<\/strong> this is a standards and procurement-verification guide. It does not replace an ATS sizing study, wiring design, short-circuit study, local electrical code review or the manufacturer\u2019s model-specific instructions.\r\n  <\/div>\r\n\r\n  <div class=\"ly-quick\">\r\n    <div id=\"ez-toc-container\" class=\"ez-toc-v2_0_87 counter-hierarchy ez-toc-counter ez-toc-custom ez-toc-container-direction\">\n<div class=\"ez-toc-title-container\">\n<p class=\"ez-toc-title\" style=\"cursor:inherit\">Table of Contents<\/p>\n<span class=\"ez-toc-title-toggle\"><\/span><\/div>\n<nav><ul class='ez-toc-list ez-toc-list-level-1 ' ><li class='ez-toc-page-1 ez-toc-heading-level-2'><a class=\"ez-toc-link ez-toc-heading-1\" href=\"#\" data-href=\"https:\/\/www.cnspd.com\/fr\/iec-60947-6-1-ats-standard\/#quick-answer-what-should-an-ats-buyer-check\" >Quick Answer: What Should an ATS Buyer Check?<\/a><\/li><li class='ez-toc-page-1 ez-toc-heading-level-2'><a class=\"ez-toc-link ez-toc-heading-2\" href=\"#\" data-href=\"https:\/\/www.cnspd.com\/fr\/iec-60947-6-1-ats-standard\/#what-does-iec-60947-6-1-2026-actually-cover\" >What Does IEC 60947-6-1:2026 Actually Cover?<\/a><\/li><li class='ez-toc-page-1 ez-toc-heading-level-2'><a class=\"ez-toc-link ez-toc-heading-3\" href=\"#\" data-href=\"https:\/\/www.cnspd.com\/fr\/iec-60947-6-1-ats-standard\/#tse-atse-and-ats-what-is-the-relationship\" >TSE, ATSE and ATS: What Is the Relationship?<\/a><\/li><li class='ez-toc-page-1 ez-toc-heading-level-2'><a class=\"ez-toc-link ez-toc-heading-4\" href=\"#\" data-href=\"https:\/\/www.cnspd.com\/fr\/iec-60947-6-1-ats-standard\/#class-pc-vs-class-cb-vs-class-cc\" >Class PC vs Class CB vs Class CC<\/a><\/li><li class='ez-toc-page-1 ez-toc-heading-level-2'><a class=\"ez-toc-link ez-toc-heading-5\" href=\"#\" data-href=\"https:\/\/www.cnspd.com\/fr\/iec-60947-6-1-ats-standard\/#what-changed-in-iec-60947-6-1-2026\" >What Changed in IEC 60947-6-1:2026?<\/a><\/li><li class='ez-toc-page-1 ez-toc-heading-level-2'><a class=\"ez-toc-link ez-toc-heading-6\" href=\"#\" data-href=\"https:\/\/www.cnspd.com\/fr\/iec-60947-6-1-ats-standard\/#do-not-approve-an-ats-by-ampere-rating-alone\" >Do Not Approve an ATS by Ampere Rating Alone<\/a><\/li><li class='ez-toc-page-1 ez-toc-heading-level-2'><a class=\"ez-toc-link ez-toc-heading-7\" href=\"#\" data-href=\"https:\/\/www.cnspd.com\/fr\/iec-60947-6-1-ats-standard\/#ac-31-ac-32-and-ac-33-utilization-categories\" >AC-31, AC-32 and AC-33 Utilization Categories<\/a><\/li><li class='ez-toc-page-1 ez-toc-heading-level-2'><a class=\"ez-toc-link ez-toc-heading-8\" href=\"#\" data-href=\"https:\/\/www.cnspd.com\/fr\/iec-60947-6-1-ats-standard\/#short-circuit-capability-do-not-compare-only-the-ka-number\" >Short-Circuit Capability: Do Not Compare Only the kA Number<\/a><\/li><li class='ez-toc-page-1 ez-toc-heading-level-2'><a class=\"ez-toc-link ez-toc-heading-9\" href=\"#\" data-href=\"https:\/\/www.cnspd.com\/fr\/iec-60947-6-1-ats-standard\/#how-should-a-class-pc-ats-coordinate-with-upstream-protection\" >How Should a Class PC ATS Coordinate With Upstream Protection?<\/a><\/li><li class='ez-toc-page-1 ez-toc-heading-level-2'><a class=\"ez-toc-link ez-toc-heading-10\" href=\"#\" data-href=\"https:\/\/www.cnspd.com\/fr\/iec-60947-6-1-ats-standard\/#does-%e2%80%9ciec-60947-6-1-compliant%e2%80%9d-mean-the-ats-is-certified\" >Does \u201cIEC 60947-6-1 Compliant\u201d Mean the ATS Is Certified?<\/a><\/li><li class='ez-toc-page-1 ez-toc-heading-level-2'><a class=\"ez-toc-link ez-toc-heading-11\" href=\"#\" data-href=\"https:\/\/www.cnspd.com\/fr\/iec-60947-6-1-ats-standard\/#what-changed-for-test-documentation-in-2026\" >What Changed for Test Documentation in 2026?<\/a><\/li><li class='ez-toc-page-1 ez-toc-heading-level-2'><a class=\"ez-toc-link ez-toc-heading-12\" href=\"#\" data-href=\"https:\/\/www.cnspd.com\/fr\/iec-60947-6-1-ats-standard\/#how-to-read-an-ats-test-report-as-a-buyer\" >How to Read an ATS Test Report as a Buyer<\/a><\/li><li class='ez-toc-page-1 ez-toc-heading-level-2'><a class=\"ez-toc-link ez-toc-heading-13\" href=\"#\" data-href=\"https:\/\/www.cnspd.com\/fr\/iec-60947-6-1-ats-standard\/#certificate-scope-does-it-cover-the-ats-you-are-buying\" >Certificate Scope: Does It Cover the ATS You Are Buying?<\/a><\/li><li class='ez-toc-page-1 ez-toc-heading-level-2'><a class=\"ez-toc-link ez-toc-heading-14\" href=\"#\" data-href=\"https:\/\/www.cnspd.com\/fr\/iec-60947-6-1-ats-standard\/#oem-and-private-label-ats-does-the-original-certificate-still-apply\" >OEM and Private-Label ATS: Does the Original Certificate Still Apply?<\/a><\/li><li class='ez-toc-page-1 ez-toc-heading-level-2'><a class=\"ez-toc-link ez-toc-heading-15\" href=\"#\" data-href=\"https:\/\/www.cnspd.com\/fr\/iec-60947-6-1-ats-standard\/#iec-60947-6-1-and-ul-1008-are-different-procurement-routes\" >IEC 60947-6-1 and UL 1008 Are Different Procurement Routes<\/a><\/li><li class='ez-toc-page-1 ez-toc-heading-level-2'><a class=\"ez-toc-link ez-toc-heading-16\" href=\"#\" data-href=\"https:\/\/www.cnspd.com\/fr\/iec-60947-6-1-ats-standard\/#how-this-verification-applies-to-a-real-leeyee-ats-datasheet\" >How This Verification Applies to a Real LEEYEE ATS Datasheet<\/a><\/li><li class='ez-toc-page-1 ez-toc-heading-level-2'><a class=\"ez-toc-link ez-toc-heading-17\" href=\"#\" data-href=\"https:\/\/www.cnspd.com\/fr\/iec-60947-6-1-ats-standard\/#a-practical-iec-60947-6-1-ats-approval-workflow\" >A Practical IEC 60947-6-1 ATS Approval Workflow<\/a><\/li><li class='ez-toc-page-1 ez-toc-heading-level-2'><a class=\"ez-toc-link ez-toc-heading-18\" href=\"#\" data-href=\"https:\/\/www.cnspd.com\/fr\/iec-60947-6-1-ats-standard\/#common-ats-procurement-mistakes\" >Common ATS Procurement Mistakes<\/a><\/li><li class='ez-toc-page-1 ez-toc-heading-level-2'><a class=\"ez-toc-link ez-toc-heading-19\" href=\"#\" data-href=\"https:\/\/www.cnspd.com\/fr\/iec-60947-6-1-ats-standard\/#iec-60947-6-1-2021-vs-2026-what-should-buyers-do\" >IEC 60947-6-1:2021 vs 2026: What Should Buyers Do?<\/a><\/li><li class='ez-toc-page-1 ez-toc-heading-level-2'><a class=\"ez-toc-link ez-toc-heading-20\" href=\"#\" data-href=\"https:\/\/www.cnspd.com\/fr\/iec-60947-6-1-ats-standard\/#before-ordering-iec-ats-verification-checklist\" >Before Ordering: IEC ATS Verification Checklist<\/a><\/li><li class='ez-toc-page-1 ez-toc-heading-level-2'><a class=\"ez-toc-link ez-toc-heading-21\" href=\"#\" data-href=\"https:\/\/www.cnspd.com\/fr\/iec-60947-6-1-ats-standard\/#frequently-asked-questions\" >Frequently Asked Questions<\/a><\/li><li class='ez-toc-page-1 ez-toc-heading-level-2'><a class=\"ez-toc-link ez-toc-heading-22\" href=\"#\" data-href=\"https:\/\/www.cnspd.com\/fr\/iec-60947-6-1-ats-standard\/#final-procurement-rule\" >Final Procurement Rule<\/a><\/li><li class='ez-toc-page-1 ez-toc-heading-level-2'><a class=\"ez-toc-link ez-toc-heading-23\" href=\"#\" data-href=\"https:\/\/www.cnspd.com\/fr\/iec-60947-6-1-ats-standard\/#references\" >References<\/a><\/li><\/ul><\/nav><\/div>\n<h2><span class=\"ez-toc-section\" id=\"quick-answer-what-should-an-ats-buyer-check\"><\/span>Quick Answer: What Should an ATS Buyer Check?<span class=\"ez-toc-section-end\"><\/span><\/h2>\r\n    <p>\r\n      <strong>IEC 60947-6-1:2026, Edition 4.0 is the current IEC standard for transfer switching equipment (TSE).<\/strong> It covers manually operated TSE, remotely operated TSE, automatic transfer switching equipment (ATSE), stand-alone ATS controllers, bypass\/isolation TSE, closed-transition ATSE and fire-pump TSE within the stated scope.<sup><a href=\"#ref-1\">[1]<\/a><\/sup>\r\n    <\/p>\r\n    <p>\r\n      Before approving an ATS, verify the <strong>equipment type, short-circuit class, Ue, Ie, utilization category, short-circuit ratings, upstream protection requirements, test evidence and exact certificate\/model scope<\/strong>. Do not approve a product only because \u201cIEC 60947-6-1\u201d appears on its datasheet.\r\n    <\/p>\r\n  <\/div>\r\n\r\n  <p class=\"ly-table-note\">The last two rows are where many purchasing errors occur: real documentation can still be irrelevant if it does not cover the exact configuration being ordered.<\/p>\r\n\r\n  <div class=\"ly-table-wrap\">\r\n    <table>\r\n      <thead>\r\n        <tr>\r\n          <th>Buyer check<\/th>\r\n          <th>What to confirm<\/th>\r\n          <th>Why it matters<\/th>\r\n        <\/tr>\r\n      <\/thead>\r\n      <tbody>\r\n        <tr>\r\n          <td data-label=\"Buyer check\"><strong>Standard edition<\/strong><\/td>\r\n          <td data-label=\"What to confirm\">IEC 60947-6-1 edition used<\/td>\r\n          <td data-label=\"Why it matters\">Shows the technical basis of the declaration, test or certification document.<\/td>\r\n        <\/tr>\r\n        <tr>\r\n          <td data-label=\"Buyer check\"><strong>Equipment type<\/strong><\/td>\r\n          <td data-label=\"What to confirm\">ATSE, RTSE, MTSE, BTSE or another covered arrangement<\/td>\r\n          <td data-label=\"Why it matters\">\u201cATS\u201d is a broad commercial term; IEC terminology is more precise.<\/td>\r\n        <\/tr>\r\n        <tr>\r\n          <td data-label=\"Buyer check\"><strong>Class<\/strong><\/td>\r\n          <td data-label=\"What to confirm\">PC, CB or CC<\/td>\r\n          <td data-label=\"Why it matters\">The class changes the short-circuit function and protection architecture.<\/td>\r\n        <\/tr>\r\n        <tr>\r\n          <td data-label=\"Buyer check\"><strong>Operational rating<\/strong><\/td>\r\n          <td data-label=\"What to confirm\">Ue, Ie, poles, frequency and utilization category<\/td>\r\n          <td data-label=\"Why it matters\">The ampere marking alone does not describe the complete switching duty.<\/td>\r\n        <\/tr>\r\n        <tr>\r\n          <td data-label=\"Buyer check\"><strong>Short-circuit data<\/strong><\/td>\r\n          <td data-label=\"What to confirm\">Applicable Icw, Iq, Icm or breaking characteristics and their conditions<\/td>\r\n          <td data-label=\"Why it matters\">Identical-looking kA values can represent different technical capabilities.<\/td>\r\n        <\/tr>\r\n        <tr>\r\n          <td data-label=\"Buyer check\"><strong>Test evidence<\/strong><\/td>\r\n          <td data-label=\"What to confirm\">Test report, certificate, datasheet and nameplate traceability<\/td>\r\n          <td data-label=\"Why it matters\">A marketing declaration alone does not prove the exact product was evaluated.<\/td>\r\n        <\/tr>\r\n        <tr>\r\n          <td data-label=\"Buyer check\"><strong>Model \/ OEM scope<\/strong><\/td>\r\n          <td data-label=\"What to confirm\">Exact model, rating, pole arrangement, brand and permitted variants<\/td>\r\n          <td data-label=\"Why it matters\">One real certificate should not be assumed to cover every product in a catalogue.<\/td>\r\n        <\/tr>\r\n      <\/tbody>\r\n    <\/table>\r\n  <\/div>\r\n\r\n  <p class=\"ly-table-conclusion\">\r\n    <strong>Procurement conclusion:<\/strong> approve the complete combination of product, ratings, classification and supporting evidence\u2014not a standard number printed by itself.\r\n  <\/p>\r\n\r\n  <h2><span class=\"ez-toc-section\" id=\"what-does-iec-60947-6-1-2026-actually-cover\"><\/span>What Does IEC 60947-6-1:2026 Actually Cover?<span class=\"ez-toc-section-end\"><\/span><\/h2>\r\n\r\n  <p>\r\n    The current publication is <strong>IEC 60947-6-1:2026, Edition 4.0<\/strong>, published on 2 April 2026. Its full title is <em>Low-voltage switchgear and controlgear \u2013 Part 6-1: Multiple function equipment \u2013 Transfer switching equipment<\/em>.<sup><a href=\"#ref-1\">[1]<\/a><\/sup>\r\n  <\/p>\r\n\r\n  <p>\r\n    IEC states that the standard applies to transfer switching equipment used to maintain continuity of supply and support energy management by transferring a load between power-supply sources. Its scope covers rated voltages not exceeding <strong>1,000 V AC or 1,500 V DC<\/strong>.<sup><a href=\"#ref-1\">[1]<\/a><\/sup>\r\n  <\/p>\r\n\r\n  <p>\r\n    It covers manually operated transfer switching equipment (MTSE), remotely operated transfer switching equipment (RTSE), automatic transfer switching equipment (ATSE), stand-alone ATS controllers, bypass\/isolation transfer switching equipment, closed-transition ATSE and fire-pump TSE.<sup><a href=\"#ref-1\">[1]<\/a><\/sup>\r\n  <\/p>\r\n\r\n  <div class=\"ly-warning\">\r\n    <strong>Important scope boundary:<\/strong> IEC specifically excludes TSE configurations that are not fully manufacturer type-tested or marked according to the document as a complete transfer switch.<sup><a href=\"#ref-1\">[1]<\/a><\/sup> If a supplier assembles separate switching devices and a controller, verify what evidence applies to the <em>complete assembled TSE<\/em>, not only to its individual components.\r\n  <\/div>\r\n\r\n  <h2><span class=\"ez-toc-section\" id=\"tse-atse-and-ats-what-is-the-relationship\"><\/span>TSE, ATSE and ATS: What Is the Relationship?<span class=\"ez-toc-section-end\"><\/span><\/h2>\r\n\r\n  <p>\r\n    <span class=\"ly-term\">TSE<\/span> means <strong>Transfer Switching Equipment<\/strong>. It is the broad product category used by IEC 60947-6-1.\r\n  <\/p>\r\n\r\n  <p>\r\n    <span class=\"ly-term\">ATSE<\/span> means <strong>Automatic Transfer Switching Equipment<\/strong>. It is one type of TSE and includes the automatic function needed to carry out the transfer operation.<sup><a href=\"#ref-1\">[1]<\/a><\/sup>\r\n  <\/p>\r\n\r\n  <p>\r\n    <span class=\"ly-term\">ATS<\/span>, or <strong>Automatic Transfer Switch<\/strong>, is the common term used in quotations, product listings and project conversations. For IEC-based technical approval, however, the equipment classification shown in the technical documentation is more useful than the marketing term alone.\r\n  <\/p>\r\n\r\n  <figure class=\"ly-figure\">\r\n    <img loading=\"lazy\"\r\n      src=\"https:\/\/www.cnspd.com\/wp-content\/uploads\/2026\/09\/tse-atse-ats-relationship.webp\"\r\n      alt=\"Relationship between TSE, ATSE and ATS terminology under IEC 60947-6-1\"\r\n      loading=\"lazy\"\r\n      decoding=\"async\"\r\n      width=\"1448\"\r\n      height=\"1086\">\r\n    <figcaption>\r\n      TSE is the broader IEC equipment category; ATSE is automatic transfer switching equipment within that category. ATS is widely used as the commercial term. The graphic explains terminology and does not represent product certification.\r\n    <\/figcaption>\r\n  <\/figure>\r\n\r\n  <div class=\"ly-buyer\">\r\n    <strong>Buyer meaning:<\/strong> instead of asking only \u201cDoes your ATS meet IEC 60947-6-1?\u201d, ask: <strong>\u201cWhat is the exact TSE type, and what test or certification evidence applies to the complete configuration?\u201d<\/strong>\r\n  <\/div>\r\n\r\n  <h2><span class=\"ez-toc-section\" id=\"class-pc-vs-class-cb-vs-class-cc\"><\/span>Class PC vs Class CB vs Class CC<span class=\"ez-toc-section-end\"><\/span><\/h2>\r\n\r\n  <p>\r\n    A complete IEC 60947-6-1 buyer guide should not reduce the classification to PC versus CB only. Transfer switching equipment can also be classified as <strong>Class CC<\/strong>. ABB\u2019s technical guidance summarises PC, CB and CC as three different short-circuit-function and equipment-architecture routes.<sup><a href=\"#ref-3\">[3]<\/a><\/sup>\r\n  <\/p>\r\n\r\n  <div class=\"ly-grid-3\">\r\n    <div class=\"ly-card\">\r\n      <h3>Class PC<\/h3>\r\n      <p>\r\n        Class PC TSE is capable of making and withstanding specified short-circuit current but is not intended to perform short-circuit breaking. Switch and switch-disconnector technology is commonly associated with this class.<sup><a href=\"#ref-3\">[3]<\/a><\/sup>\r\n      <\/p>\r\n    <\/div>\r\n\r\n    <div class=\"ly-card\">\r\n      <h3>Class CB<\/h3>\r\n      <p>\r\n        Class CB TSE is capable of making, withstanding and breaking short-circuit current according to its declared characteristics and is provided with overcurrent releases. Circuit-breaker-based arrangements are commonly associated with this class.<sup><a href=\"#ref-3\">[3]<\/a><\/sup>\r\n      <\/p>\r\n    <\/div>\r\n\r\n    <div class=\"ly-card\">\r\n      <h3>Class CC<\/h3>\r\n      <p>\r\n        Class CC TSE is based on devices fulfilling the applicable IEC 60947-4-1 contactor requirements. It can make and withstand short-circuit current under its declared conditions but is not intended to provide the short-circuit breaking function.<sup><a href=\"#ref-3\">[3]<\/a><\/sup>\r\n      <\/p>\r\n    <\/div>\r\n  <\/div>\r\n\r\n  <p>\r\n    PC and CB receive most of the attention in many industrial ATS purchasing discussions, but Class CC should not be omitted when checking the classification of contactor-based transfer solutions.\r\n  <\/p>\r\n\r\n  <figure class=\"ly-figure\">\r\n    <img loading=\"lazy\"\r\n      src=\"https:\/\/www.cnspd.com\/wp-content\/uploads\/2026\/09\/class-pc-vs-class-cb-ats.webp\"\r\n      alt=\"Class PC versus Class CB automatic transfer switch short-circuit protection concept\"\r\n      loading=\"lazy\"\r\n      decoding=\"async\"\r\n      width=\"1448\"\r\n      height=\"1086\">\r\n    <figcaption>\r\n      Conceptual comparison of Class PC and Class CB short-circuit protection architecture. The final design must follow model-specific short-circuit ratings, protective-device coordination and the project fault-current study.\r\n    <\/figcaption>\r\n  <\/figure>\r\n\r\n  <div class=\"ly-warning\">\r\n    <strong>Do not use \u201cCB is better than PC\u201d as a buying rule.<\/strong> PC, CB and CC describe different equipment functions and architectures. The appropriate class depends on the project protection concept, fault-current conditions, required coordination and tested product configuration.\r\n  <\/div>\r\n\r\n  <h2><span class=\"ez-toc-section\" id=\"what-changed-in-iec-60947-6-1-2026\"><\/span>What Changed in IEC 60947-6-1:2026?<span class=\"ez-toc-section-end\"><\/span><\/h2>\r\n\r\n  <p>\r\n    The fourth edition is not simply a date update. IEC identifies several significant technical changes compared with the 2021 third edition, including clarified scope and terminology plus dedicated requirements for bypass\/isolation TSE, closed-transition ATSE, stand-alone ATS controllers and fire-pump TSE.<sup><a href=\"#ref-1\">[1]<\/a><\/sup>\r\n  <\/p>\r\n\r\n  <div class=\"ly-table-wrap\">\r\n    <table>\r\n      <thead>\r\n        <tr>\r\n          <th>2026 change<\/th>\r\n          <th>IEC location<\/th>\r\n          <th>Buyer meaning<\/th>\r\n        <\/tr>\r\n      <\/thead>\r\n      <tbody>\r\n        <tr>\r\n          <td data-label=\"2026 change\"><strong>Bypass \/ isolation TSE<\/strong><\/td>\r\n          <td data-label=\"IEC location\">Annex C<\/td>\r\n          <td data-label=\"Buyer meaning\">If bypass\/isolation is required, do not assume evidence for a standard ATSE automatically covers the bypass arrangement.<\/td>\r\n        <\/tr>\r\n        <tr>\r\n          <td data-label=\"2026 change\"><strong>Closed-transition ATSE<\/strong><\/td>\r\n          <td data-label=\"IEC location\">Annex D<\/td>\r\n          <td data-label=\"Buyer meaning\">If the project requires source overlap during transfer, confirm closed-transition capability and documentation explicitly.<\/td>\r\n        <\/tr>\r\n        <tr>\r\n          <td data-label=\"2026 change\"><strong>Stand-alone ATS controller<\/strong><\/td>\r\n          <td data-label=\"IEC location\">Annex E<\/td>\r\n          <td data-label=\"Buyer meaning\">Controller compliance alone should not be assumed to prove that a complete assembled ATS has been evaluated as a complete TSE.<\/td>\r\n        <\/tr>\r\n        <tr>\r\n          <td data-label=\"2026 change\"><strong>Fire-pump TSE<\/strong><\/td>\r\n          <td data-label=\"IEC location\">Annex F<\/td>\r\n          <td data-label=\"Buyer meaning\">Fire-pump applications need application-specific project and regulatory review.<\/td>\r\n        <\/tr>\r\n      <\/tbody>\r\n    <\/table>\r\n  <\/div>\r\n\r\n  <h2><span class=\"ez-toc-section\" id=\"do-not-approve-an-ats-by-ampere-rating-alone\"><\/span>Do Not Approve an ATS by Ampere Rating Alone<span class=\"ez-toc-section-end\"><\/span><\/h2>\r\n\r\n  <p>\r\n    \u201c400 A ATS\u201d is not a complete engineering description. Rated operational current must be read together with the voltage, utilization category and conditions under which the current is declared.\r\n  <\/p>\r\n\r\n  <div class=\"ly-table-wrap\">\r\n    <table>\r\n      <thead>\r\n        <tr>\r\n          <th>Parameter<\/th>\r\n          <th>Plain-English meaning<\/th>\r\n          <th>Buyer check<\/th>\r\n        <\/tr>\r\n      <\/thead>\r\n      <tbody>\r\n        <tr>\r\n          <td data-label=\"Parameter\"><strong>Ue<\/strong><\/td>\r\n          <td data-label=\"Meaning\">Rated operational voltage<\/td>\r\n          <td data-label=\"Buyer check\">Does the declared rating cover the actual system voltage?<\/td>\r\n        <\/tr>\r\n        <tr>\r\n          <td data-label=\"Parameter\"><strong>Ie<\/strong><\/td>\r\n          <td data-label=\"Meaning\">Rated operational current<\/td>\r\n          <td data-label=\"Buyer check\">Does the configuration support the required current under the declared utilization category?<\/td>\r\n        <\/tr>\r\n        <tr>\r\n          <td data-label=\"Parameter\"><strong>Poles<\/strong><\/td>\r\n          <td data-label=\"Meaning\">Number of switched poles<\/td>\r\n          <td data-label=\"Buyer check\">Does the switching arrangement match the neutral and system design?<\/td>\r\n        <\/tr>\r\n        <tr>\r\n          <td data-label=\"Parameter\"><strong>Frequency<\/strong><\/td>\r\n          <td data-label=\"Meaning\">Declared AC operating frequency<\/td>\r\n          <td data-label=\"Buyer check\">Does it match the source and project specification?<\/td>\r\n        <\/tr>\r\n        <tr>\r\n          <td data-label=\"Parameter\"><strong>Utilization category<\/strong><\/td>\r\n          <td data-label=\"Meaning\">The electrical switching duty for which the TSE is rated<\/td>\r\n          <td data-label=\"Buyer check\">Do not assume the same Ie applies to every load type.<\/td>\r\n        <\/tr>\r\n      <\/tbody>\r\n    <\/table>\r\n  <\/div>\r\n\r\n  <h2><span class=\"ez-toc-section\" id=\"ac-31-ac-32-and-ac-33-utilization-categories\"><\/span>AC-31, AC-32 and AC-33 Utilization Categories<span class=\"ez-toc-section-end\"><\/span><\/h2>\r\n\r\n  <p>\r\n    Utilization category is important because electrical switching stress changes with the load. Practical manufacturer guidance commonly associates AC-31 with non-inductive or slightly inductive loads, AC-32 with mixed resistive and inductive loads, and AC-33 with motor-containing loads.<sup><a href=\"#ref-4\">[4]<\/a><\/sup>\r\n  <\/p>\r\n\r\n  <div class=\"ly-table-wrap\">\r\n    <table>\r\n      <thead>\r\n        <tr>\r\n          <th>Category family<\/th>\r\n          <th>Typical load description<\/th>\r\n          <th>Buyer implication<\/th>\r\n        <\/tr>\r\n      <\/thead>\r\n      <tbody>\r\n        <tr>\r\n          <td data-label=\"Category\"><strong>AC-31<\/strong><\/td>\r\n          <td data-label=\"Typical load\">Non-inductive or slightly inductive loads<\/td>\r\n          <td data-label=\"Buyer implication\">Do not automatically extend an AC-31 rating to a motor-heavy application.<\/td>\r\n        <\/tr>\r\n        <tr>\r\n          <td data-label=\"Category\"><strong>AC-32<\/strong><\/td>\r\n          <td data-label=\"Typical load\">Mixed resistive and inductive loads<\/td>\r\n          <td data-label=\"Buyer implication\">Check the actual Ie declaration for the selected model and voltage.<\/td>\r\n        <\/tr>\r\n        <tr>\r\n          <td data-label=\"Category\"><strong>AC-33<\/strong><\/td>\r\n          <td data-label=\"Typical load\">Motor loads or mixed loads containing motors<\/td>\r\n          <td data-label=\"Buyer implication\">Motor duty can increase switching stress; verify category and operational current.<\/td>\r\n        <\/tr>\r\n      <\/tbody>\r\n    <\/table>\r\n  <\/div>\r\n\r\n  <div class=\"ly-buyer\">\r\n    <strong>Buyer meaning:<\/strong> do not select a utilization category from the application name alone. Confirm the category and corresponding Ie declared for the exact TSE configuration.\r\n  <\/div>\r\n\r\n  <h2><span class=\"ez-toc-section\" id=\"short-circuit-capability-do-not-compare-only-the-ka-number\"><\/span>Short-Circuit Capability: Do Not Compare Only the kA Number<span class=\"ez-toc-section-end\"><\/span><\/h2>\r\n\r\n  <p>\r\n    Short-circuit performance is one of the most important areas where apparently similar ATS products can differ. The first question should be: <strong>what does the stated kA value actually represent?<\/strong>\r\n  <\/p>\r\n\r\n  <div class=\"ly-table-wrap\">\r\n    <table>\r\n      <thead>\r\n        <tr>\r\n          <th>Term<\/th>\r\n          <th>Buyer meaning<\/th>\r\n          <th>Condition to verify<\/th>\r\n        <\/tr>\r\n      <\/thead>\r\n      <tbody>\r\n        <tr>\r\n          <td data-label=\"Term\"><strong>Icw<\/strong><\/td>\r\n          <td data-label=\"Buyer meaning\">Declared short-time withstand current<\/td>\r\n          <td data-label=\"Condition\">Time duration, voltage and exact TSE configuration.<\/td>\r\n        <\/tr>\r\n        <tr>\r\n          <td data-label=\"Term\"><strong>Iq<\/strong><\/td>\r\n          <td data-label=\"Buyer meaning\">Conditional short-circuit current with a specified SCPD<\/td>\r\n          <td data-label=\"Condition\">The protective device and verified combination are part of the declaration.<\/td>\r\n        <\/tr>\r\n        <tr>\r\n          <td data-label=\"Term\"><strong>Icm<\/strong><\/td>\r\n          <td data-label=\"Buyer meaning\">Short-circuit making characteristic where declared<\/td>\r\n          <td data-label=\"Condition\">Applicable voltage, test condition and product classification.<\/td>\r\n        <\/tr>\r\n        <tr>\r\n          <td data-label=\"Term\"><strong>Breaker breaking capacity<\/strong><\/td>\r\n          <td data-label=\"Buyer meaning\">Relevant to circuit-breaker-based Class CB architecture<\/td>\r\n          <td data-label=\"Condition\">Do not treat it as the same quantity as Icw or Iq.<\/td>\r\n        <\/tr>\r\n      <\/tbody>\r\n    <\/table>\r\n  <\/div>\r\n\r\n  <div class=\"ly-warning\">\r\n    <strong>Procurement rule:<\/strong> 50 kA Icw, 50 kA conditional short-circuit current and 50 kA breaker breaking capacity are not interchangeable statements.\r\n  <\/div>\r\n\r\n  <h2><span class=\"ez-toc-section\" id=\"how-should-a-class-pc-ats-coordinate-with-upstream-protection\"><\/span>How Should a Class PC ATS Coordinate With Upstream Protection?<span class=\"ez-toc-section-end\"><\/span><\/h2>\r\n\r\n  <p>\r\n    For Class PC equipment, the short-circuit protection concept must be reviewed together with the upstream short-circuit protective device where the declared conditional rating depends on that protective device.\r\n  <\/p>\r\n\r\n  <p>For project approval, ask for:<\/p>\r\n\r\n  <ul>\r\n    <li>the applicable upstream fuse or circuit-breaker type;<\/li>\r\n    <li>the protective-device rating used for the declared conditional performance;<\/li>\r\n    <li>the relevant prospective short-circuit-current condition;<\/li>\r\n    <li>Icw together with the stated duration where applicable;<\/li>\r\n    <li>confirmation that the data applies to the selected current rating, poles and construction.<\/li>\r\n  <\/ul>\r\n\r\n  <div class=\"ly-warning\">\r\n    <strong>Engineering boundary:<\/strong> do not replace the documented SCPD with a different fuse or breaker merely because the current rating appears similar. Final coordination must follow the manufacturer\u2019s verified data and the project short-circuit study.\r\n  <\/div>\r\n\r\n  <h2><span class=\"ez-toc-section\" id=\"does-%e2%80%9ciec-60947-6-1-compliant%e2%80%9d-mean-the-ats-is-certified\"><\/span>Does \u201cIEC 60947-6-1 Compliant\u201d Mean the ATS Is Certified?<span class=\"ez-toc-section-end\"><\/span><\/h2>\r\n\r\n  <p>\r\n    Not by itself. IEC publishes standards and operates conformity-assessment systems, but an IEC standard number printed on a product page does not identify who performed the conformity assessment or which exact models are covered.\r\n  <\/p>\r\n\r\n  <div class=\"ly-note\">\r\n    <strong>Better question:<\/strong> \u201cWhat test report, certification document or other conformity evidence supports the IEC 60947-6-1 declaration for this exact model?\u201d\r\n  <\/div>\r\n\r\n  <p>\r\n    Depending on the project, supporting evidence may include manufacturer technical files, independent laboratory test reports, certification-body certificates, CB Scheme documentation or another conformity route required by the destination market.\r\n  <\/p>\r\n\r\n  <h2><span class=\"ez-toc-section\" id=\"what-changed-for-test-documentation-in-2026\"><\/span>What Changed for Test Documentation in 2026?<span class=\"ez-toc-section-end\"><\/span><\/h2>\r\n\r\n  <p>\r\n    The IECEE published <strong>IECEE TRF 60947-6-1E:2026<\/strong> on 4 September 2026. IEC identifies it as the Test Report Form for IEC 60947-6-1:2026 used in conjunction with IEC 60947-1:2020.<sup><a href=\"#ref-2\">[2]<\/a><\/sup>\r\n  <\/p>\r\n\r\n  <div class=\"ly-warning\">\r\n    <strong>Do not draw the wrong conclusion:<\/strong> publication of a new IEC edition or a new IECEE Test Report Form does not by itself prove that every document based on an earlier edition immediately became invalid. Transition and acceptance rules must be confirmed for the specific certification scheme and project.\r\n  <\/div>\r\n\r\n  <h2><span class=\"ez-toc-section\" id=\"how-to-read-an-ats-test-report-as-a-buyer\"><\/span>How to Read an ATS Test Report as a Buyer<span class=\"ez-toc-section-end\"><\/span><\/h2>\r\n\r\n  <p>\r\n    A test report is useful only when the tested equipment can be connected to the product that will actually be supplied.\r\n  <\/p>\r\n\r\n  <div class=\"ly-table-wrap\">\r\n    <table>\r\n      <thead>\r\n        <tr>\r\n          <th>Report item<\/th>\r\n          <th>Buyer question<\/th>\r\n          <th>Risk if ignored<\/th>\r\n        <\/tr>\r\n      <\/thead>\r\n      <tbody>\r\n        <tr>\r\n          <td data-label=\"Report item\"><strong>Manufacturer<\/strong><\/td>\r\n          <td data-label=\"Buyer question\">Does the identity correspond to the supplied equipment?<\/td>\r\n          <td data-label=\"Risk\">The document may relate to another manufacturer.<\/td>\r\n        <\/tr>\r\n        <tr>\r\n          <td data-label=\"Report item\"><strong>Model \/ series<\/strong><\/td>\r\n          <td data-label=\"Buyer question\">Is the ordered model explicitly covered or traceably included?<\/td>\r\n          <td data-label=\"Risk\">A genuine report can still be irrelevant to the purchased model.<\/td>\r\n        <\/tr>\r\n        <tr>\r\n          <td data-label=\"Report item\"><strong>TSE type<\/strong><\/td>\r\n          <td data-label=\"Buyer question\">Is it ATSE, RTSE, MTSE or another documented configuration?<\/td>\r\n          <td data-label=\"Risk\">The tested control arrangement may differ from the offered unit.<\/td>\r\n        <\/tr>\r\n        <tr>\r\n          <td data-label=\"Report item\"><strong>Class<\/strong><\/td>\r\n          <td data-label=\"Buyer question\">Is PC, CB or CC clearly identified?<\/td>\r\n          <td data-label=\"Risk\">The assumed short-circuit function may be wrong.<\/td>\r\n        <\/tr>\r\n        <tr>\r\n          <td data-label=\"Report item\"><strong>Ue \/ Ie<\/strong><\/td>\r\n          <td data-label=\"Buyer question\">Does the scope cover the required voltage and current?<\/td>\r\n          <td data-label=\"Risk\">A different rating may be incorrectly treated as equivalent.<\/td>\r\n        <\/tr>\r\n        <tr>\r\n          <td data-label=\"Report item\"><strong>Utilization category<\/strong><\/td>\r\n          <td data-label=\"Buyer question\">Does the switching duty match the intended load?<\/td>\r\n          <td data-label=\"Risk\">The current rating may be interpreted outside its tested duty.<\/td>\r\n        <\/tr>\r\n        <tr>\r\n          <td data-label=\"Report item\"><strong>Short-circuit data<\/strong><\/td>\r\n          <td data-label=\"Buyer question\">Are Icw, Iq, Icm or applicable breaking conditions clear?<\/td>\r\n          <td data-label=\"Risk\">A kA figure may be compared under the wrong technical meaning.<\/td>\r\n        <\/tr>\r\n        <tr>\r\n          <td data-label=\"Report item\"><strong>Poles \/ variants<\/strong><\/td>\r\n          <td data-label=\"Buyer question\">Does the scope include the ordered construction?<\/td>\r\n          <td data-label=\"Risk\">An unverified variant may be assumed to be covered.<\/td>\r\n        <\/tr>\r\n      <\/tbody>\r\n    <\/table>\r\n  <\/div>\r\n\r\n  <h2><span class=\"ez-toc-section\" id=\"certificate-scope-does-it-cover-the-ats-you-are-buying\"><\/span>Certificate Scope: Does It Cover the ATS You Are Buying?<span class=\"ez-toc-section-end\"><\/span><\/h2>\r\n\r\n  <p>\r\n    A frequent purchasing mistake is accepting a genuine certificate without checking whether it covers the actual ATS model.\r\n  <\/p>\r\n\r\n  <p>\r\n    One certificate should not automatically be treated as evidence for every current rating, pole configuration, controller, model suffix or construction in a supplier\u2019s catalogue.\r\n  <\/p>\r\n\r\n  <figure class=\"ly-figure\">\r\n    <img loading=\"lazy\"\r\n      src=\"https:\/\/www.cnspd.com\/wp-content\/uploads\/2026\/09\/ats-certificate-verification-workflow.webp\"\r\n      alt=\"ATS certificate and IEC 60947-6-1 test report verification workflow for buyers\"\r\n      loading=\"lazy\"\r\n      decoding=\"async\"\r\n      width=\"1448\"\r\n      height=\"1086\">\r\n    <figcaption>\r\n      A practical verification path: compare the actual product and nameplate with the certificate, test report and ordered model. This workflow is a procurement method, not a substitute for model-specific conformity documentation.\r\n    <\/figcaption>\r\n  <\/figure>\r\n\r\n  <div class=\"ly-success\">\r\n    <strong>Use a traceability chain:<\/strong><br>\r\n    Product nameplate \u2192 Datasheet \u2192 Certificate \u2192 Test report \u2192 Purchase-order model.\r\n  <\/div>\r\n\r\n  <p>\r\n    If one link cannot be connected to the next, request clarification before technical approval.\r\n  <\/p>\r\n\r\n  <h2><span class=\"ez-toc-section\" id=\"oem-and-private-label-ats-does-the-original-certificate-still-apply\"><\/span>OEM and Private-Label ATS: Does the Original Certificate Still Apply?<span class=\"ez-toc-section-end\"><\/span><\/h2>\r\n\r\n  <p>\r\n    Do not assume that changing the commercial brand or model designation automatically leaves certification coverage unchanged.\r\n  <\/p>\r\n\r\n  <p>\r\n    OEM projects can change the trademark, model number, nameplate, controller, enclosure, pole arrangement, rated current, terminal design or internal construction. Some changes may be commercial only; others can affect product identity or the tested construction.\r\n  <\/p>\r\n\r\n  <div class=\"ly-buyer\">\r\n    <strong>Ask before approving an OEM order:<\/strong>\r\n    <ul>\r\n      <li>Which tested or certified original model does the OEM model map to?<\/li>\r\n      <li>Are any electrical or mechanical parts changing?<\/li>\r\n      <li>Can the new trademark and model designation remain within the current certification arrangement?<\/li>\r\n      <li>Does the certification body need to review the OEM identity?<\/li>\r\n      <li>Will the final product remain traceable to the evaluated construction?<\/li>\r\n    <\/ul>\r\n  <\/div>\r\n\r\n  <h2><span class=\"ez-toc-section\" id=\"iec-60947-6-1-and-ul-1008-are-different-procurement-routes\"><\/span>IEC 60947-6-1 and UL 1008 Are Different Procurement Routes<span class=\"ez-toc-section-end\"><\/span><\/h2>\r\n\r\n  <p>\r\n    IEC 60947-6-1 is the IEC standard for transfer switching equipment within its defined scope. In the North American conformity framework, UL 1008 is used for transfer switch equipment.<sup><a href=\"#ref-8\">[8]<\/a><\/sup>\r\n  <\/p>\r\n\r\n  <p>\r\n    An IEC 60947-6-1 declaration does not by itself establish UL 1008 compliance, and UL 1008 certification does not by itself establish conformity with IEC 60947-6-1.\r\n  <\/p>\r\n\r\n  <div class=\"ly-buyer\">\r\n    <strong>Buyer meaning:<\/strong> define the destination market and project specification before selecting the final ATS or starting OEM production.\r\n  <\/div>\r\n\r\n  <h2><span class=\"ez-toc-section\" id=\"how-this-verification-applies-to-a-real-leeyee-ats-datasheet\"><\/span>How This Verification Applies to a Real LEEYEE ATS Datasheet<span class=\"ez-toc-section-end\"><\/span><\/h2>\r\n\r\n  <div class=\"ly-proof\">\r\n    <h3>Use published product data as the start of verification\u2014not the end<\/h3>\r\n    <p>\r\n      Public LEEYEE ATS product information can provide fields such as rated operational current, rated working voltage, class, utilization category, short-circuit data and protective-device recommendations.\r\n    <\/p>\r\n    <p>\r\n      These are the kinds of fields a B2B buyer should trace through the product datasheet, nameplate and applicable test or conformity documents before project approval.\r\n    <\/p>\r\n    <p>\r\n      <strong>Important:<\/strong> a product specification page is not, by itself, proof that a particular third-party certificate covers that exact model. Projects requiring IEC 60947-6-1 certification or a specific conformity route should verify the supporting documents separately.\r\n    <\/p>\r\n  <\/div>\r\n\r\n  <h2><span class=\"ez-toc-section\" id=\"a-practical-iec-60947-6-1-ats-approval-workflow\"><\/span>A Practical IEC 60947-6-1 ATS Approval Workflow<span class=\"ez-toc-section-end\"><\/span><\/h2>\r\n\r\n  <ol class=\"ly-flow\">\r\n    <li>\r\n      <strong>Confirm the destination-market requirement.<\/strong>\r\n      Identify the country, project specification, IEC\/EN\/UL route and local approval requirement.\r\n    <\/li>\r\n    <li>\r\n      <strong>Confirm the TSE type.<\/strong>\r\n      Determine whether the project requires ATSE, RTSE, MTSE, bypass\/isolation TSE, closed-transition ATSE or another defined arrangement.\r\n    <\/li>\r\n    <li>\r\n      <strong>Confirm PC, CB or CC class.<\/strong>\r\n      Match the class to the project protection architecture.\r\n    <\/li>\r\n    <li>\r\n      <strong>Confirm Ue, Ie and utilization category.<\/strong>\r\n      Evaluate the rating under the actual voltage and load duty instead of using ampere value alone.\r\n    <\/li>\r\n    <li>\r\n      <strong>Confirm short-circuit performance.<\/strong>\r\n      Identify the meaning of each Icw, Iq, Icm or breaker-related value and all attached conditions.\r\n    <\/li>\r\n    <li>\r\n      <strong>Confirm protective-device coordination.<\/strong>\r\n      Where performance depends on an upstream SCPD, verify the exact fuse or circuit-breaker combination.\r\n    <\/li>\r\n    <li>\r\n      <strong>Confirm the evidence.<\/strong>\r\n      Compare test report, certificate, datasheet and manufacturer documentation.\r\n    <\/li>\r\n    <li>\r\n      <strong>Confirm the supplied product.<\/strong>\r\n      Make sure the final purchase-order model, label, poles, ratings and OEM identity remain traceable to the approved documents.\r\n    <\/li>\r\n  <\/ol>\r\n\r\n  <h2><span class=\"ez-toc-section\" id=\"common-ats-procurement-mistakes\"><\/span>Common ATS Procurement Mistakes<span class=\"ez-toc-section-end\"><\/span><\/h2>\r\n\r\n  <div class=\"ly-table-wrap\">\r\n    <table>\r\n      <thead>\r\n        <tr>\r\n          <th>Mistake<\/th>\r\n          <th>Why it is risky<\/th>\r\n          <th>Better buyer action<\/th>\r\n        <\/tr>\r\n      <\/thead>\r\n      <tbody>\r\n        <tr>\r\n          <td data-label=\"Mistake\">\u201cIt says IEC 60947-6-1, so it is approved.\u201d<\/td>\r\n          <td data-label=\"Why it is risky\">The statement does not identify the evidence or model scope.<\/td>\r\n          <td data-label=\"Better action\">Request model-specific technical and conformity documents.<\/td>\r\n        <\/tr>\r\n        <tr>\r\n          <td data-label=\"Mistake\">Comparing only 250 A vs 250 A.<\/td>\r\n          <td data-label=\"Why it is risky\">Voltage, utilization category and class may differ.<\/td>\r\n          <td data-label=\"Better action\">Compare the complete declared operating duty.<\/td>\r\n        <\/tr>\r\n        <tr>\r\n          <td data-label=\"Mistake\">Comparing only \u201c50 kA vs 50 kA.\u201d<\/td>\r\n          <td data-label=\"Why it is risky\">The values may describe different short-circuit characteristics.<\/td>\r\n          <td data-label=\"Better action\">Identify the rating type, duration and associated SCPD.<\/td>\r\n        <\/tr>\r\n        <tr>\r\n          <td data-label=\"Mistake\">Ignoring Class CC.<\/td>\r\n          <td data-label=\"Why it is risky\">Contactor-based TSE can follow a different classification route.<\/td>\r\n          <td data-label=\"Better action\">Verify whether the proposed equipment is PC, CB or CC.<\/td>\r\n        <\/tr>\r\n        <tr>\r\n          <td data-label=\"Mistake\">Assuming Class CB is always better.<\/td>\r\n          <td data-label=\"Why it is risky\">PC, CB and CC represent different functions and architectures.<\/td>\r\n          <td data-label=\"Better action\">Select according to the actual protection design.<\/td>\r\n        <\/tr>\r\n        <tr>\r\n          <td data-label=\"Mistake\">Using one certificate for an entire catalogue.<\/td>\r\n          <td data-label=\"Why it is risky\">Certificate scope may be narrower than the commercial range.<\/td>\r\n          <td data-label=\"Better action\">Trace the ordered model to the certificate and report.<\/td>\r\n        <\/tr>\r\n      <\/tbody>\r\n    <\/table>\r\n  <\/div>\r\n\r\n  <h2><span class=\"ez-toc-section\" id=\"iec-60947-6-1-2021-vs-2026-what-should-buyers-do\"><\/span>IEC 60947-6-1:2021 vs 2026: What Should Buyers Do?<span class=\"ez-toc-section-end\"><\/span><\/h2>\r\n\r\n  <p>\r\n    IEC 60947-6-1:2026 is the current fourth edition and replaces the third edition published in 2021.<sup><a href=\"#ref-1\">[1]<\/a><\/sup>\r\n  <\/p>\r\n\r\n  <p>\r\n    For new sourcing and project review, identify which edition supports the supplier\u2019s current documentation. Do not independently declare an earlier-edition certificate invalid only because a newer edition exists; transition arrangements and project acceptance must be confirmed with the relevant certification body and project authority.\r\n  <\/p>\r\n\r\n  <div class=\"ly-checklist\">\r\n    <h2><span class=\"ez-toc-section\" id=\"before-ordering-iec-ats-verification-checklist\"><\/span>Before Ordering: IEC ATS Verification Checklist<span class=\"ez-toc-section-end\"><\/span><\/h2>\r\n    <ul>\r\n      <li><strong>Destination market:<\/strong> country, project specification and required conformity route.<\/li>\r\n      <li><strong>System:<\/strong> rated voltage, frequency, phase arrangement and neutral design.<\/li>\r\n      <li><strong>Load:<\/strong> continuous current and major motor, transformer or high-inrush characteristics.<\/li>\r\n      <li><strong>Transfer function:<\/strong> automatic, remote, manual, open transition, closed transition or bypass requirement.<\/li>\r\n      <li><strong>Poles:<\/strong> required switching arrangement based on the actual system.<\/li>\r\n      <li><strong>TSE class:<\/strong> PC, CB or CC.<\/li>\r\n      <li><strong>Utilization category:<\/strong> category and corresponding Ie for the exact model.<\/li>\r\n      <li><strong>Short-circuit conditions:<\/strong> available fault current and applicable Icw, Iq, Icm or breaker data.<\/li>\r\n      <li><strong>Upstream protection:<\/strong> required SCPD and manufacturer coordination data.<\/li>\r\n      <li><strong>Documentation:<\/strong> standard edition, certificate, test report, datasheet and installation instructions.<\/li>\r\n      <li><strong>Model scope:<\/strong> exact current rating, poles, controller and construction covered.<\/li>\r\n      <li><strong>OEM requirement:<\/strong> trademark, model name, label, packaging and any technical change.<\/li>\r\n    <\/ul>\r\n  <\/div>\r\n\r\n  <div class=\"ly-cta\">\r\n    <p>\r\n      Need to review an ATS for an IEC-based project or OEM order? Prepare the system voltage, load current, poles, utilization category, available fault current and required conformity documents before requesting final model confirmation.\r\n    <\/p>\r\n\r\n    <button\r\n      type=\"button\"\r\n      class=\"leeyee-about-btn-light leeyee-site-popup-btn\"\r\n      aria-label=\"Request ATS Technical Verification\">\r\n      <span class=\"w-btn-label\">Request ATS Technical Verification<\/span>\r\n    <\/button>\r\n  <\/div>\r\n\r\n  <h2><span class=\"ez-toc-section\" id=\"frequently-asked-questions\"><\/span>Frequently Asked Questions<span class=\"ez-toc-section-end\"><\/span><\/h2>\r\n\r\n  <div class=\"ly-faq-item\">\r\n    <h3>Is IEC 60947-6-1 the IEC standard for automatic transfer switches?<\/h3>\r\n    <p>\r\n      IEC 60947-6-1 is the IEC product standard for transfer switching equipment within its scope and includes automatic transfer switching equipment (ATSE). ATS is the common commercial term.\r\n    <\/p>\r\n  <\/div>\r\n\r\n  <div class=\"ly-faq-item\">\r\n    <h3>What is the latest edition of IEC 60947-6-1?<\/h3>\r\n    <p>\r\n      The current edition is <strong>IEC 60947-6-1:2026, Edition 4.0<\/strong>, published on 2 April 2026.<sup><a href=\"#ref-1\">[1]<\/a><\/sup>\r\n    <\/p>\r\n  <\/div>\r\n\r\n  <div class=\"ly-faq-item\">\r\n    <h3>What is Class PC in an ATS?<\/h3>\r\n    <p>\r\n      Class PC TSE can make and withstand specified short-circuit current but is not intended to perform the short-circuit breaking function. Its short-circuit ratings must be reviewed together with the applicable protection arrangement.\r\n    <\/p>\r\n  <\/div>\r\n\r\n  <div class=\"ly-faq-item\">\r\n    <h3>What is Class CB in an ATS?<\/h3>\r\n    <p>\r\n      Class CB is associated with TSE capable of making, withstanding and breaking short-circuit current according to its declared characteristics and incorporating overcurrent releases.\r\n    <\/p>\r\n  <\/div>\r\n\r\n  <div class=\"ly-faq-item\">\r\n    <h3>What is Class CC?<\/h3>\r\n    <p>\r\n      Class CC applies to contactor-based TSE using equipment that fulfils the relevant IEC 60947-4-1 requirements. It should be verified separately rather than assumed to be PC or CB.\r\n    <\/p>\r\n  <\/div>\r\n\r\n  <div class=\"ly-faq-item\">\r\n    <h3>Is Class CB better than Class PC?<\/h3>\r\n    <p>\r\n      No general ranking should be made. The classes represent different protection functions and architectures. Selection depends on the actual short-circuit and protection design.\r\n    <\/p>\r\n  <\/div>\r\n\r\n  <div class=\"ly-faq-item\">\r\n    <h3>Does one IEC 60947-6-1 certificate cover every ATS current rating?<\/h3>\r\n    <p>\r\n      Do not assume that it does. Check the certificate scope, product family, ratings, construction variants and associated test documentation.\r\n    <\/p>\r\n  <\/div>\r\n\r\n  <div class=\"ly-faq-item\">\r\n    <h3>Can an OEM ATS use the original manufacturer's certificate after changing the brand?<\/h3>\r\n    <p>\r\n      Possibly under some certification arrangements, but this must be confirmed. The certificate holder, certification body, model identity and approved construction determine whether the private-label variant remains within scope.\r\n    <\/p>\r\n  <\/div>\r\n\r\n  <div class=\"ly-faq-item\">\r\n    <h3>Is IEC 60947-6-1 equivalent to UL 1008?<\/h3>\r\n    <p>\r\n      No. They are different standards and conformity frameworks. The project specification and destination market should determine which route is required.\r\n    <\/p>\r\n  <\/div>\r\n\r\n  <h2><span class=\"ez-toc-section\" id=\"final-procurement-rule\"><\/span>Final Procurement Rule<span class=\"ez-toc-section-end\"><\/span><\/h2>\r\n\r\n  <p>The weak question is:<\/p>\r\n\r\n  <div class=\"ly-note\">\r\n    <strong>\u201cDoes this ATS comply with IEC 60947-6-1?\u201d<\/strong>\r\n  <\/div>\r\n\r\n  <p>The stronger question is:<\/p>\r\n\r\n  <div class=\"ly-success\">\r\n    <strong>\u201cPlease show how this exact ATS model, voltage, current rating, utilization category, PC\/CB\/CC class and short-circuit configuration are supported by the applicable IEC 60947-6-1 technical and conformity documentation.\u201d<\/strong>\r\n  <\/div>\r\n\r\n  <div class=\"ly-related\">\r\n    <h3>Continue the ATS Decision Process<\/h3>\r\n    <ul>\r\n      <li><a href=\"https:\/\/www.cnspd.com\/what-is-an-automatic-transfer-switch-how-ats-works-how-to-choose\/\">Automatic Transfer Switch: How ATS Works and How to Choose<\/a><\/li>\r\n      <li><a href=\"https:\/\/www.cnspd.com\/products\/leeyee-automatic-transfer-switch-solar-backup\/\">LEEYEE ATS Product Information<\/a><\/li>\r\n    <\/ul>\r\n  <\/div>\r\n\r\n  <div class=\"ly-references\">\r\n    <h2><span class=\"ez-toc-section\" id=\"references\"><\/span>References<span class=\"ez-toc-section-end\"><\/span><\/h2>\r\n    <ol>\r\n      <li id=\"ref-1\">\r\n        International Electrotechnical Commission, <em>IEC 60947-6-1:2026 \u2014 Low-voltage switchgear and controlgear \u2013 Part 6-1: Multiple function equipment \u2013 Transfer switching equipment<\/em>, Edition 4.0.\r\n        <a href=\"https:\/\/webstore.iec.ch\/en\/publication\/90494\" target=\"_blank\" rel=\"noopener\">IEC official publication page<\/a>.\r\n      <\/li>\r\n      <li id=\"ref-2\">\r\n        IECEE, <em>IECEE TRF 60947-6-1E:2026 \u2014 Test Report Form for IEC 60947-6-1:2026<\/em>.\r\n        <a href=\"https:\/\/webstore.iec.ch\/en\/publication\/114039\" target=\"_blank\" rel=\"noopener\">IEC \/ IECEE official TRF page<\/a>.\r\n      <\/li>\r\n      <li id=\"ref-3\">\r\n        ABB, <em>How to Select an Automatic Transfer Switch<\/em>, technical white paper covering PC, CB and CC classifications and short-circuit selection.\r\n        <a href=\"https:\/\/library.e.abb.com\/public\/a0a6a4a06b204e7bbf5988e6d35ee364\/ATS%20white%20paper_1SCC303022C0201_20-09.pdf\" target=\"_blank\" rel=\"noopener\">ABB official technical paper<\/a>.\r\n      <\/li>\r\n      <li id=\"ref-4\">\r\n        ABB, technical guidance on transfer switching and utilization categories.\r\n        <a href=\"https:\/\/library.e.abb.com\/public\/67ddd3dc21504f5bad07491fc1862a32\/EL13%20Automatic%20Transfer%20Switch%20solution%20by%20Breaker%20and%20Switch%20-%20Presentation.pdf\" target=\"_blank\" rel=\"noopener\">ABB official technical presentation<\/a>.\r\n      <\/li>\r\n      <li id=\"ref-5\">\r\n        ABB, <em>TruONE ATS Automatic Transfer Switches \u2014 Catalogue<\/em>, operational-current, utilization-category and short-circuit data.\r\n        <a href=\"https:\/\/library.e.abb.com\/public\/25c9e1779834463fa2d4481651093d44\/TruONE%20ATS_Main%20catalog_1SCC303008C0201_2025.pdf\" target=\"_blank\" rel=\"noopener\">ABB official catalogue<\/a>.\r\n      <\/li>\r\n      <li id=\"ref-6\">\r\n        International Electrotechnical Commission, <em>IEC CAB-P01 \u2014 IEC Conformity Assessment Board Policy<\/em>.\r\n        <a href=\"https:\/\/assets.iec.ch\/public\/cab\/ieccab-p01%7Bed2.0%7Den.pdf\" target=\"_blank\" rel=\"noopener\">IEC official policy<\/a>.\r\n      <\/li>\r\n      <li id=\"ref-7\">\r\n        International Electrotechnical Commission, <em>Test Report Forms<\/em>.\r\n        <a href=\"https:\/\/webstore.iec.ch\/en\/products\/value-added-products\/test-report-forms\/\" target=\"_blank\" rel=\"noopener\">IEC official TRF information<\/a>.\r\n      <\/li>\r\n      <li id=\"ref-8\">\r\n        UL Solutions, <em>Switch Certification and Evaluation Services<\/em>.\r\n        <a href=\"https:\/\/www.ul.com\/services\/switch-certification-and-evaluation-services\" target=\"_blank\" rel=\"noopener\">UL Solutions official page<\/a>.\r\n      <\/li>\r\n    <\/ol>\r\n\r\n    <p class=\"ly-small\">\r\n      Standards, certification schemes and national acceptance requirements can change. For a specific project, confirm the applicable standard edition, conformity route, certificate scope, local adoption and protection design with the manufacturer, certification body and project authority before final approval.\r\n    <\/p>\r\n  <\/div>\r\n\r\n  <script>\r\n    document.addEventListener('DOMContentLoaded', function () {\r\n      var aboutPopupButtons = document.querySelectorAll('.leeyee-site-popup-btn');\r\n\r\n      aboutPopupButtons.forEach(function (button) {\r\n        button.addEventListener('click', function () {\r\n          var realPopupTrigger = document.querySelector('.w-popup.ush_popup_1 .w-popup-trigger');\r\n\r\n          if (realPopupTrigger) {\r\n            realPopupTrigger.click();\r\n          } else {\r\n            window.open('https:\/\/www.cnspd.com\/contact\/', '_blank', 'noopener');\r\n          }\r\n        });\r\n      });\r\n    });\r\n  <\/script>\r\n\r\n<\/div>\t\t\t\t<\/div>\n\t\t\t\t<\/div>\n\t\t\t\t\t<\/div>\n\t\t\t\t<\/div>\n\t\t\t\t<\/div>\n\t\t","protected":false},"excerpt":{"rendered":"<p>IEC 60947-6-1 ATS Buyer Verification Guide IEC 60947-6-1 is the principal IEC product standard for transfer switching equipment used to transfer a load between power sources. For an ATS buyer, however, seeing \u201cIEC 60947-6-1\u201d on a catalogue is only the starting point. A useful technical approval must connect the standard claim to the exact TSE&#8230;<\/p>","protected":false},"author":18,"featured_media":0,"comment_status":"closed","ping_status":"open","sticky":false,"template":"","format":"standard","meta":{"footnotes":""},"categories":[490,1,422],"tags":[],"class_list":["post-31095","post","type-post","status-publish","format-standard","hentry","category-isolator-switching","category-news","category-industry-news"],"acf":[],"yoast_head":"<!-- This site is optimized with the Yoast SEO plugin v28.3 - https:\/\/yoast.com\/product\/yoast-seo-wordpress\/ -->\n<title>IEC 60947-6-1:2026 ATS Standard &amp; Buyer Verification Guide<\/title>\n<meta name=\"description\" content=\"Understand IEC 60947-6-1:2026 for ATS and ATSE. 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