{"id":31390,"date":"2026-09-29T10:00:23","date_gmt":"2026-09-29T02:00:23","guid":{"rendered":"https:\/\/www.cnspd.com\/?p=31390"},"modified":"2026-09-29T10:01:22","modified_gmt":"2026-09-29T02:01:22","slug":"automatic-transfer-switch-for-commercial-buildings-6a-63a-backup-power-selection-guide","status":"publish","type":"post","link":"https:\/\/www.cnspd.com\/id\/commercial-building-automatic-transfer-switch\/","title":{"rendered":"Automatic Transfer Switch for Commercial Buildings: 6A\u201363A Backup Power Selection Guide"},"content":{"rendered":"\t\t<div data-elementor-type=\"wp-post\" data-elementor-id=\"31390\" class=\"elementor elementor-31390\" data-elementor-post-type=\"post\">\n\t\t\t\t<div class=\"elementor-element elementor-element-e8f9e90 e-flex e-con-boxed e-con e-parent\" data-id=\"e8f9e90\" 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-ac8339a elementor-widget 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var(--ly-blue);\r\n}\r\n\r\n.leeyee-commercial-ats .ly-figure {\r\n  margin: 31px 0 36px;\r\n}\r\n\r\n.leeyee-commercial-ats .ly-figure img {\r\n  display: block;\r\n  width: 100%;\r\n  max-width: 100%;\r\n  height: auto;\r\n  margin: 0 auto;\r\n  border-radius: 9px;\r\n}\r\n\r\n.leeyee-commercial-ats .ly-product-figure img {\r\n  width: auto;\r\n  max-width: min(100%, 640px);\r\n  max-height: 650px;\r\n  object-fit: contain;\r\n}\r\n\r\n.leeyee-commercial-ats figcaption {\r\n  max-width: 760px;\r\n  margin: 10px auto 0;\r\n  color: var(--ly-muted);\r\n  font-size: 14px;\r\n  line-height: 1.55;\r\n  text-align: center;\r\n}\r\n\r\n.leeyee-commercial-ats .ly-table-intro {\r\n  margin: 0 0 10px;\r\n  color: var(--ly-muted);\r\n  font-size: 14px;\r\n  line-height: 1.55;\r\n}\r\n\r\n.leeyee-commercial-ats .ly-table-wrap {\r\n  width: 100%;\r\n  margin: 20px 0 11px;\r\n}\r\n\r\n.leeyee-commercial-ats table {\r\n  width: 100%;\r\n  border-collapse: collapse;\r\n  border-spacing: 0;\r\n  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.18s ease,\r\n    border-color .18s ease,\r\n    box-shadow .18s ease,\r\n    transform .18s ease;\r\n}\r\n\r\n.leeyee-commercial-ats .leeyee-about-btn-light:hover {\r\n  border-color: #004898;\r\n  background: #004898;\r\n  box-shadow: 0 6px 15px rgba(0, 72, 152, .16);\r\n  color: #fff;\r\n  transform: translateY(-1px);\r\n}\r\n\r\n.leeyee-commercial-ats .leeyee-about-btn-light:focus {\r\n  outline: none;\r\n}\r\n\r\n.leeyee-commercial-ats .leeyee-about-btn-light:focus-visible {\r\n  outline: 3px solid rgba(0, 72, 152, .28);\r\n  outline-offset: 3px;\r\n  border-color: #004898;\r\n  background: #fff;\r\n  color: #004898;\r\n}\r\n\r\n.leeyee-commercial-ats .leeyee-about-btn-light:active {\r\n  transform: translateY(0);\r\n}\r\n\r\n@media (max-width: 820px) {\r\n  .leeyee-commercial-ats {\r\n    font-size: 16px;\r\n    line-height: 1.68;\r\n  }\r\n\r\n  .leeyee-commercial-ats h2 {\r\n    margin-top: 46px;\r\n    font-size: 28px;\r\n  }\r\n\r\n  .leeyee-commercial-ats h3 {\r\n    font-size: 21px;\r\n  }\r\n\r\n  .leeyee-commercial-ats .ly-lead {\r\n    font-size: 18px;\r\n  }\r\n\r\n  .leeyee-commercial-ats .ly-key-grid,\r\n  .leeyee-commercial-ats .ly-fit-grid {\r\n    grid-template-columns: 1fr;\r\n  }\r\n\r\n  .leeyee-commercial-ats .ly-checklist {\r\n    columns: 1;\r\n  }\r\n}\r\n\r\n@media (max-width: 600px) {\r\n  .leeyee-commercial-ats .ly-quick,\r\n  .leeyee-commercial-ats .ly-note,\r\n  .leeyee-commercial-ats .ly-warning,\r\n  .leeyee-commercial-ats .ly-checklist-box,\r\n  .leeyee-commercial-ats .ly-cta {\r\n    padding: 20px;\r\n  }\r\n\r\n  .leeyee-commercial-ats .ly-quick h2 {\r\n    font-size: 24px;\r\n  }\r\n\r\n  .leeyee-commercial-ats table,\r\n  .leeyee-commercial-ats thead,\r\n  .leeyee-commercial-ats tbody,\r\n  .leeyee-commercial-ats tr,\r\n  .leeyee-commercial-ats th,\r\n  .leeyee-commercial-ats td {\r\n    display: block;\r\n    width: 100%;\r\n  }\r\n\r\n  .leeyee-commercial-ats thead {\r\n    display: none;\r\n  }\r\n\r\n  .leeyee-commercial-ats tr {\r\n    margin-bottom: 14px;\r\n    border: 1px solid #d9e3eb;\r\n    border-radius: 8px;\r\n    overflow: hidden;\r\n    background: #fff;\r\n  }\r\n\r\n  .leeyee-commercial-ats td {\r\n    display: grid;\r\n    grid-template-columns: minmax(112px, 36%) 1fr;\r\n    gap: 12px;\r\n    border: 0;\r\n    border-bottom: 1px solid #e4eaf0;\r\n    background: #fff !important;\r\n  }\r\n\r\n  .leeyee-commercial-ats td:last-child {\r\n    border-bottom: 0;\r\n  }\r\n\r\n  .leeyee-commercial-ats td::before {\r\n    content: attr(data-label);\r\n    color: #203548;\r\n    font-weight: 700;\r\n  }\r\n}\r\n\r\n@media (max-width: 480px) {\r\n  .leeyee-commercial-ats h2 {\r\n    font-size: 25px;\r\n  }\r\n\r\n  .leeyee-commercial-ats h3 {\r\n    font-size: 20px;\r\n  }\r\n\r\n  .leeyee-commercial-ats .ly-lead {\r\n    font-size: 17px;\r\n  }\r\n\r\n  .leeyee-commercial-ats .ly-steps > li {\r\n    padding: 16px 10px 16px 49px;\r\n  }\r\n\r\n  .leeyee-commercial-ats .ly-steps > li::before {\r\n    top: 16px;\r\n    left: 8px;\r\n  }\r\n\r\n  .leeyee-commercial-ats td {\r\n    grid-template-columns: 1fr;\r\n    gap: 5px;\r\n  }\r\n\r\n  .leeyee-commercial-ats .leeyee-about-btn-light {\r\n    width: 100%;\r\n    min-height: 50px;\r\n    padding: 12px 16px;\r\n    margin-top: 10px;\r\n  }\r\n}\r\n\r\n@media (max-width: 360px) {\r\n  .leeyee-commercial-ats h2 {\r\n    font-size: 23px;\r\n  }\r\n\r\n  .leeyee-commercial-ats .ly-quick,\r\n  .leeyee-commercial-ats .ly-note,\r\n  .leeyee-commercial-ats .ly-warning,\r\n  .leeyee-commercial-ats .ly-checklist-box,\r\n  .leeyee-commercial-ats .ly-cta {\r\n    padding: 17px;\r\n  }\r\n}\r\n<\/style>\r\n\r\n<div class=\"leeyee-commercial-ats\">\r\n\r\n  <section class=\"ly-intro\">\r\n    <span class=\"ly-intro-label\">Commercial Building Backup Power Guide<\/span>\r\n\r\n    <p class=\"ly-lead\">\r\n      For a commercial building, the right automatic transfer switch is selected from the\r\n      <strong>backup circuit it actually supplies<\/strong>, not simply from the total electrical capacity of the building.\r\n      This is especially important for compact 2P and 4P ATS products used in small commercial distribution boards and backup panels.\r\n    <\/p>\r\n\r\n    <p>\r\n      This guide focuses on light-commercial applications such as selected backup circuits in offices,\r\n      retail premises, apartment common areas, small commercial facilities, control panels and auxiliary distribution boards.\r\n      It is written for panel builders, electrical contractors, generator integrators, distributors and project buyers.\r\n    <\/p>\r\n  <\/section>\r\n\r\n  <section 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\/id\/commercial-building-automatic-transfer-switch\/#quick-answer-when-does-a-compact-ats-fit-a-commercial-building\" >Quick Answer: When Does a Compact ATS Fit a Commercial Building?<\/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\/id\/commercial-building-automatic-transfer-switch\/#which-commercial-loads-should-be-put-on-the-backup-branch\" >Which Commercial Loads Should Be Put on the Backup Branch?<\/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\/id\/commercial-building-automatic-transfer-switch\/#where-does-the-ats-sit-in-a-commercial-backup-power-system\" >Where Does the ATS Sit in a Commercial Backup-Power System?<\/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\/id\/commercial-building-automatic-transfer-switch\/#how-should-you-size-the-ats-current\" >How Should You Size the ATS Current?<\/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\/id\/commercial-building-automatic-transfer-switch\/#what-does-the-real-leeyee-ats-63-look-like\" >What Does the Real LEEYEE ATS-63 Look Like?<\/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\/id\/commercial-building-automatic-transfer-switch\/#where-is-ats-63-a-good-fit\" >Where Is ATS-63 a Good Fit?<\/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\/id\/commercial-building-automatic-transfer-switch\/#what-are-the-published-ats-63-selection-limits\" >What Are the Published ATS-63 Selection Limits?<\/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\/id\/commercial-building-automatic-transfer-switch\/#should-you-choose-2p-or-4p\" >Should You Choose 2P or 4P?<\/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\/id\/commercial-building-automatic-transfer-switch\/#what-does-open-transition-mean-for-commercial-loads\" >What Does Open Transition Mean for Commercial Loads?<\/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\/id\/commercial-building-automatic-transfer-switch\/#can-ats-63-be-used-with-a-backup-generator\" >Can ATS-63 Be Used with a Backup Generator?<\/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\/id\/commercial-building-automatic-transfer-switch\/#what-about-bms-dry-contacts-or-modbus\" >What About BMS, Dry Contacts or Modbus?<\/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\/id\/commercial-building-automatic-transfer-switch\/#what-changes-when-the-ats-is-installed-in-a-low-voltage-panel\" >What Changes When the ATS Is Installed in a Low-Voltage Panel?<\/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\/id\/commercial-building-automatic-transfer-switch\/#example-small-commercial-backup-panel\" >Example: Small Commercial Backup Panel<\/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\/id\/commercial-building-automatic-transfer-switch\/#common-commercial-ats-selection-mistakes\" >Common Commercial ATS Selection Mistakes<\/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\/id\/commercial-building-automatic-transfer-switch\/#what-should-you-send-before-ordering\" >What Should You Send Before Ordering?<\/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\/id\/commercial-building-automatic-transfer-switch\/#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-17\" href=\"#\" data-href=\"https:\/\/www.cnspd.com\/id\/commercial-building-automatic-transfer-switch\/#final-selection-principle\" >Final Selection Principle<\/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\/id\/commercial-building-automatic-transfer-switch\/#references\" >References<\/a><\/li><\/ul><\/nav><\/div>\n<h2><span class=\"ez-toc-section\" id=\"quick-answer-when-does-a-compact-ats-fit-a-commercial-building\"><\/span>Quick Answer: When Does a Compact ATS Fit a Commercial Building?<span class=\"ez-toc-section-end\"><\/span><\/h2>\r\n\r\n    <p>\r\n      A compact ATS can be suitable when a defined commercial backup branch needs to transfer\r\n      between two AC sources and the circuit falls within the ATS ratings.\r\n      For a typical utility-generator arrangement, one source is utility power and the other is the generator supply. [2][3][4]\r\n    <\/p>\r\n\r\n    <p>\r\n      The published LEEYEE ATS-63 range is <strong>6A\u201363A, 2P or 4P, AC110V \/ AC220V \/ AC400V,\r\n      50\/60Hz, PC class and AC-31B<\/strong>.\r\n      LEEYEE lists compact generator backup, control panels, distribution boards and light-commercial systems among its intended applications. [4]\r\n    <\/p>\r\n\r\n    <div class=\"ly-key-grid\">\r\n      <div class=\"ly-key-item\">\r\n        <strong>Define the backup branch<\/strong>\r\n        Identify which circuits will actually pass through the ATS.\r\n      <\/div>\r\n\r\n      <div class=\"ly-key-item\">\r\n        <strong>Check current and load type<\/strong>\r\n        Confirm operating current and consider starting or inrush conditions where relevant.\r\n      <\/div>\r\n\r\n      <div class=\"ly-key-item\">\r\n        <strong>Confirm 2P or 4P<\/strong>\r\n        Pole selection must match the actual phase, neutral, earthing and project arrangement.\r\n      <\/div>\r\n\r\n      <div class=\"ly-key-item\">\r\n        <strong>Check required controls<\/strong>\r\n        Generator-start, BMS, dry-contact or communication functions must be verified if the project requires them.\r\n      <\/div>\r\n    <\/div>\r\n  <\/section>\r\n\r\n  <figure class=\"ly-figure\">\r\n    <img\r\n      src=\"https:\/\/www.cnspd.com\/wp-content\/uploads\/2026\/09\/commercial-building-ats-backup-power-system-diagram.webp\"\r\n      alt=\"Commercial building automatic transfer switch backup power system diagram with utility, generator, ATS and essential load panel\"\r\n      loading=\"eager\"\r\n      decoding=\"async\">\r\n    <figcaption>\r\n      Simplified commercial backup-power architecture. The ATS transfers a defined backup-load branch between two sources;\r\n      the final arrangement must follow the project single-line diagram and applicable electrical requirements.\r\n    <\/figcaption>\r\n  <\/figure>\r\n\r\n  <h2><span class=\"ez-toc-section\" id=\"which-commercial-loads-should-be-put-on-the-backup-branch\"><\/span>Which Commercial Loads Should Be Put on the Backup Branch?<span class=\"ez-toc-section-end\"><\/span><\/h2>\r\n\r\n  <p>\r\n    There is no universal commercial-building load list.\r\n    The electrical designer should first decide which circuits require the alternate source.\r\n    Only then can the transfer branch be sized.\r\n  <\/p>\r\n\r\n  <p class=\"ly-table-intro\">\r\n    The most important column below is \u201cWhat to confirm\u201d because the load name alone is not enough for ATS selection.\r\n  <\/p>\r\n\r\n  <div class=\"ly-table-wrap\">\r\n    <table>\r\n      <thead>\r\n        <tr>\r\n          <th>Load Group<\/th>\r\n          <th>Typical Example<\/th>\r\n          <th>What to Confirm<\/th>\r\n        <\/tr>\r\n      <\/thead>\r\n      <tbody>\r\n        <tr>\r\n          <td data-label=\"Load Group\">Lighting<\/td>\r\n          <td data-label=\"Typical Example\">Selected backup or essential lighting circuits<\/td>\r\n          <td data-label=\"What to Confirm\">Actual branch current and project backup requirement<\/td>\r\n        <\/tr>\r\n        <tr>\r\n          <td data-label=\"Load Group\">Security<\/td>\r\n          <td data-label=\"Typical Example\">CCTV, access control and monitoring equipment<\/td>\r\n          <td data-label=\"What to Confirm\">Load current and whether separate UPS support is used<\/td>\r\n        <\/tr>\r\n        <tr>\r\n          <td data-label=\"Load Group\">Communication<\/td>\r\n          <td data-label=\"Typical Example\">Network cabinet or communication equipment<\/td>\r\n          <td data-label=\"What to Confirm\">Whether the equipment can tolerate transfer interruption<\/td>\r\n        <\/tr>\r\n        <tr>\r\n          <td data-label=\"Load Group\">Controls<\/td>\r\n          <td data-label=\"Typical Example\">Control panels and selected BMS auxiliary circuits<\/td>\r\n          <td data-label=\"What to Confirm\">Required source continuity and monitoring interfaces<\/td>\r\n        <\/tr>\r\n        <tr>\r\n          <td data-label=\"Load Group\">Pumps \/ Motors<\/td>\r\n          <td data-label=\"Typical Example\">Selected small auxiliary pumps or motors<\/td>\r\n          <td data-label=\"What to Confirm\">Running current, starting current and switching duty<\/td>\r\n        <\/tr>\r\n      <\/tbody>\r\n    <\/table>\r\n  <\/div>\r\n\r\n  <p class=\"ly-table-note\">\r\n    Procurement conclusion: define the circuits on the backup branch first. Do not size a compact ATS from the building's total service rating.\r\n  <\/p>\r\n\r\n  <div class=\"ly-warning\">\r\n    <h3>Life-safety circuits require separate project confirmation<\/h3>\r\n\r\n    <p>\r\n      Fire-pump systems and other life-safety circuits can have dedicated equipment, transfer and approval requirements.\r\n      IEC 60947-6-1:2026 includes specific provisions for transfer switching equipment used with electric-driven fire-pump control equipment. [1]\r\n    <\/p>\r\n\r\n    <p>\r\n      Do not approve a compact ATS for a life-safety application only because the current rating appears sufficient.\r\n      The responsible engineer must confirm the equipment category, transfer function, protection, certification and local project requirements.\r\n    <\/p>\r\n  <\/div>\r\n\r\n  <h2><span class=\"ez-toc-section\" id=\"where-does-the-ats-sit-in-a-commercial-backup-power-system\"><\/span>Where Does the ATS Sit in a Commercial Backup-Power System?<span class=\"ez-toc-section-end\"><\/span><\/h2>\r\n\r\n  <p>\r\n    An ATS transfers a load between power sources.\r\n    It does not replace the upstream circuit breaker, fuse, generator controls, distribution board or the engineering design of the complete installation.\r\n  <\/p>\r\n\r\n  <p>\r\n    For a small commercial branch, a common concept is:\r\n    <strong>utility source + alternate source \u2192 ATS \u2192 backup distribution branch<\/strong>.\r\n    Larger commercial buildings may instead use multiple transfer switches or engineered switchgear assemblies.\r\n  <\/p>\r\n\r\n  <div class=\"ly-evidence\">\r\n    <strong>Buyer meaning<\/strong>\r\n    Locate the ATS on the single-line diagram before choosing its rating.\r\n    A 40A or 63A backup branch inside a commercial building is not the same application as the building's main incoming supply.\r\n  <\/div>\r\n\r\n  <h2><span class=\"ez-toc-section\" id=\"how-should-you-size-the-ats-current\"><\/span>How Should You Size the ATS Current?<span class=\"ez-toc-section-end\"><\/span><\/h2>\r\n\r\n  <p>\r\n    Start with the load passing through the switch.\r\n    The ATS current rating must be suitable for that branch, while the load characteristics and surrounding protection system also need to be checked.\r\n  <\/p>\r\n\r\n  <ol class=\"ly-steps\">\r\n    <li>\r\n      <strong>Identify the transferred circuits.<\/strong>\r\n      Separate the loads requiring backup power from circuits that remain outside the ATS branch.\r\n    <\/li>\r\n\r\n    <li>\r\n      <strong>Determine the operating current.<\/strong>\r\n      Confirm the load current together with system voltage, phase arrangement and frequency.\r\n    <\/li>\r\n\r\n    <li>\r\n      <strong>Review load characteristics.<\/strong>\r\n      Motors, pumps and similar loads can have starting or inrush conditions that are not represented by running current alone.\r\n    <\/li>\r\n\r\n    <li>\r\n      <strong>Check the protection system.<\/strong>\r\n      The ATS must be applied within its published ratings and coordinated with the actual short-circuit and upstream protective-device conditions.\r\n    <\/li>\r\n\r\n    <li>\r\n      <strong>Confirm panel space and wiring.<\/strong>\r\n      Verify the mounting arrangement, conductor routing and available installation dimensions before ordering.\r\n    <\/li>\r\n  <\/ol>\r\n\r\n  <figure class=\"ly-figure\">\r\n    <img\r\n      src=\"https:\/\/www.cnspd.com\/wp-content\/uploads\/2026\/09\/commercial-building-ats-selection-flowchart.webp\"\r\n      alt=\"Commercial building ATS selection flowchart for backup loads, current, voltage, poles, generator requirements and panel confirmation\"\r\n      loading=\"lazy\"\r\n      decoding=\"async\">\r\n    <figcaption>\r\n      Practical selection flow for a small commercial ATS branch:\r\n      load \u2192 current \u2192 voltage and phase \u2192 pole configuration \u2192 source requirements \u2192 panel confirmation.\r\n    <\/figcaption>\r\n  <\/figure>\r\n\r\n  <h2><span class=\"ez-toc-section\" id=\"what-does-the-real-leeyee-ats-63-look-like\"><\/span>What Does the Real LEEYEE ATS-63 Look Like?<span class=\"ez-toc-section-end\"><\/span><\/h2>\r\n\r\n  <p>\r\n    The product used for this application is LEEYEE's actual compact ATS-63 family,\r\n    not a large cabinet-style transfer switch and not a standard circuit-breaker-looking device.\r\n    The real product is available in 2P and 4P versions. [4]\r\n  <\/p>\r\n\r\n  <figure class=\"ly-figure ly-product-figure\">\r\n    <img\r\n      src=\"https:\/\/www.cnspd.com\/wp-content\/uploads\/2026\/06\/2.png\"\r\n      alt=\"LEEYEE 2P and 4P ATS-63 automatic transfer switches with Auto Manual control for generator backup power\"\r\n      loading=\"lazy\"\r\n      decoding=\"async\">\r\n    <figcaption>\r\n      Actual LEEYEE compact ATS-63 product in 2P and 4P versions.\r\n      The front panel shows local Auto \/ Manual operation and visible source\/load status indications.\r\n      Exact terminal functions, ratings and project compatibility must still be checked against the ordered model documentation.\r\n    <\/figcaption>\r\n  <\/figure>\r\n\r\n  <div class=\"ly-evidence\">\r\n    <strong>What this real product image confirms<\/strong>\r\n    The ATS-63 is a compact integrated transfer device with a front Auto \/ Manual control area and status indicators.\r\n    The 4P product image also shows generator\/grid application marking.\r\n    These visible features support its use as a compact utility-to-backup-source transfer device, but they do not by themselves prove functions such as remote generator-start contacts, BMS communication or Modbus.\r\n  <\/div>\r\n\r\n  <h2><span class=\"ez-toc-section\" id=\"where-is-ats-63-a-good-fit\"><\/span>Where Is ATS-63 a Good Fit?<span class=\"ez-toc-section-end\"><\/span><\/h2>\r\n\r\n  <div class=\"ly-fit-grid\">\r\n    <div class=\"ly-fit-box ly-fit\">\r\n      <h3>Typical application direction<\/h3>\r\n      <ul>\r\n        <li>Small commercial backup distribution boards<\/li>\r\n        <li>Selected office or retail backup circuits<\/li>\r\n        <li>Apartment common-area auxiliary circuits<\/li>\r\n        <li>Compact control cabinets<\/li>\r\n        <li>Telecom or monitoring cabinets<\/li>\r\n        <li>Utility-to-generator backup branches where all electrical conditions match<\/li>\r\n      <\/ul>\r\n    <\/div>\r\n\r\n    <div class=\"ly-fit-box ly-limit\">\r\n      <h3>Use another engineered solution when required<\/h3>\r\n      <ul>\r\n        <li>The transfer circuit exceeds 63A<\/li>\r\n        <li>The application is a large building main incomer<\/li>\r\n        <li>Closed transition or source paralleling is required<\/li>\r\n        <li>Bypass-isolation transfer equipment is required<\/li>\r\n        <li>A specialized life-safety transfer system is specified<\/li>\r\n        <li>The connected load cannot tolerate transfer interruption<\/li>\r\n      <\/ul>\r\n    <\/div>\r\n  <\/div>\r\n\r\n  <h2><span class=\"ez-toc-section\" id=\"what-are-the-published-ats-63-selection-limits\"><\/span>What Are the Published ATS-63 Selection Limits?<span class=\"ez-toc-section-end\"><\/span><\/h2>\r\n\r\n  <p class=\"ly-table-intro\">\r\n    These values are for initial model screening. Final approval should use the latest LEEYEE documentation for the exact ordered configuration. [4]\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>Published ATS-63 Data<\/th>\r\n          <th>Selection Meaning<\/th>\r\n        <\/tr>\r\n      <\/thead>\r\n      <tbody>\r\n        <tr>\r\n          <td data-label=\"Parameter\">Rated current Ie<\/td>\r\n          <td data-label=\"Published Data\">6 \/ 10 \/ 16 \/ 20 \/ 25 \/ 32 \/ 40 \/ 50 \/ 63A<\/td>\r\n          <td data-label=\"Selection Meaning\">Choose from the actual transferred-load requirement<\/td>\r\n        <\/tr>\r\n        <tr>\r\n          <td data-label=\"Parameter\">Poles<\/td>\r\n          <td data-label=\"Published Data\">2P \/ 4P<\/td>\r\n          <td data-label=\"Selection Meaning\">Match the phase and neutral arrangement<\/td>\r\n        <\/tr>\r\n        <tr>\r\n          <td data-label=\"Parameter\">Working voltage Ue<\/td>\r\n          <td data-label=\"Published Data\">AC110V \/ AC220V \/ AC400V<\/td>\r\n          <td data-label=\"Selection Meaning\">Match the project system voltage<\/td>\r\n        <\/tr>\r\n        <tr>\r\n          <td data-label=\"Parameter\">Frequency<\/td>\r\n          <td data-label=\"Published Data\">50\/60Hz<\/td>\r\n          <td data-label=\"Selection Meaning\">Confirm destination-system frequency<\/td>\r\n        <\/tr>\r\n        <tr>\r\n          <td data-label=\"Parameter\">Class<\/td>\r\n          <td data-label=\"Published Data\">PC<\/td>\r\n          <td data-label=\"Selection Meaning\">Coordinate the ATS with the required upstream protection<\/td>\r\n        <\/tr>\r\n        <tr>\r\n          <td data-label=\"Parameter\">Utilization category<\/td>\r\n          <td data-label=\"Published Data\">AC-31B<\/td>\r\n          <td data-label=\"Selection Meaning\">Confirm the actual load duty against product documentation<\/td>\r\n        <\/tr>\r\n        <tr>\r\n          <td data-label=\"Parameter\">Rated short-circuit current Iq<\/td>\r\n          <td data-label=\"Published Data\">5kA<\/td>\r\n          <td data-label=\"Selection Meaning\">Verify project fault conditions and upstream protection<\/td>\r\n        <\/tr>\r\n        <tr>\r\n          <td data-label=\"Parameter\">Mounting<\/td>\r\n          <td data-label=\"Published Data\">DIN rail<\/td>\r\n          <td data-label=\"Selection Meaning\">Suitable for compact panel integration when dimensions and clearances match<\/td>\r\n        <\/tr>\r\n      <\/tbody>\r\n    <\/table>\r\n  <\/div>\r\n\r\n  <p class=\"ly-table-note\">\r\n    Procurement conclusion: \u201c63A ATS\u201d is not a complete specification. Current, voltage, poles, load duty, wiring, protection and installation conditions all need confirmation.\r\n  <\/p>\r\n\r\n  <h2><span class=\"ez-toc-section\" id=\"should-you-choose-2p-or-4p\"><\/span>Should You Choose 2P or 4P?<span class=\"ez-toc-section-end\"><\/span><\/h2>\r\n\r\n  <p>\r\n    ATS-63 is available in both 2P and 4P versions. [4]\r\n    Pole selection should follow the actual electrical system rather than a simple purchasing shortcut.\r\n  <\/p>\r\n\r\n  <div class=\"ly-table-wrap\">\r\n    <table>\r\n      <thead>\r\n        <tr>\r\n          <th>Option<\/th>\r\n          <th>Typical Direction<\/th>\r\n          <th>Project Check<\/th>\r\n        <\/tr>\r\n      <\/thead>\r\n      <tbody>\r\n        <tr>\r\n          <td data-label=\"Option\">2P<\/td>\r\n          <td data-label=\"Typical Direction\">Commonly evaluated for single-phase circuits<\/td>\r\n          <td data-label=\"Project Check\">Confirm line, neutral, source wiring and earthing arrangement<\/td>\r\n        <\/tr>\r\n        <tr>\r\n          <td data-label=\"Option\">4P<\/td>\r\n          <td data-label=\"Typical Direction\">Used where three phases and neutral are switched<\/td>\r\n          <td data-label=\"Project Check\">Confirm neutral switching, source configuration and project requirements<\/td>\r\n        <\/tr>\r\n      <\/tbody>\r\n    <\/table>\r\n  <\/div>\r\n\r\n  <p class=\"ly-table-note\">\r\n    Procurement conclusion: do not order 2P or 4P from phase count alone. The approved neutral and earthing arrangement must also be checked.\r\n  <\/p>\r\n\r\n  <h2><span class=\"ez-toc-section\" id=\"what-does-open-transition-mean-for-commercial-loads\"><\/span>What Does Open Transition Mean for Commercial Loads?<span class=\"ez-toc-section-end\"><\/span><\/h2>\r\n\r\n  <p>\r\n    In an open-transition transfer, the switch uses a <strong>break-before-make<\/strong> sequence:\r\n    it disconnects the load from one source before connecting the other source. [2]\r\n  <\/p>\r\n\r\n  <p>\r\n    That means the sources are not intentionally paralleled during transfer.\r\n    It also means the load experiences an interruption while the source connection changes. [2]\r\n  <\/p>\r\n\r\n  <div class=\"ly-note\">\r\n    <h3>ATS is not the same as UPS power<\/h3>\r\n\r\n    <p>\r\n      If a communication device, server, controller or other load cannot tolerate a transfer interruption,\r\n      the complete power system may need a UPS or another continuity solution in addition to source transfer.\r\n    <\/p>\r\n\r\n    <p>\r\n      Confirm this from the real load requirement rather than assuming that the ATS alone provides uninterrupted power.\r\n    <\/p>\r\n  <\/div>\r\n\r\n  <p>\r\n    IEC 60947-6-1:2026 separately covers automatic transfer switching equipment\r\n    and includes specific provisions for closed-transition and bypass\/isolation transfer equipment. [1]\r\n    Projects requiring those functions should use equipment specifically designed and verified for them.\r\n  <\/p>\r\n\r\n  <h2><span class=\"ez-toc-section\" id=\"can-ats-63-be-used-with-a-backup-generator\"><\/span>Can ATS-63 Be Used with a Backup Generator?<span class=\"ez-toc-section-end\"><\/span><\/h2>\r\n\r\n  <p>\r\n    Yes. LEEYEE's current ATS-63 product information lists generator backup as an intended application\r\n    for switching between utility power and generator backup power in small power systems,\r\n    provided the electrical parameters match the application. [4]\r\n  <\/p>\r\n\r\n  <p>\r\n    However, <strong>generator backup switching<\/strong> and <strong>generator auto-start output<\/strong> are different functions.\r\n    Some ATS systems can send a genset-start signal when the normal source becomes unacceptable, but that capability is controller-specific. [3]\r\n  <\/p>\r\n\r\n  <div class=\"ly-warning\">\r\n    <h3>Do not assume a generator-start dry contact from the product photo<\/h3>\r\n\r\n    <p>\r\n      The real ATS-63 image clearly shows generator\/grid application markings,\r\n      but an image cannot prove a specific remote generator-start output.\r\n      The current public ATS-63 product page also does not publish a generator-start dry-contact specification. [4]\r\n    <\/p>\r\n\r\n    <p>\r\n      If the project requires the ATS to start a generator,\r\n      confirm the exact controller, terminal functions and wiring documentation with LEEYEE before approval.\r\n    <\/p>\r\n  <\/div>\r\n\r\n  <h2><span class=\"ez-toc-section\" id=\"what-about-bms-dry-contacts-or-modbus\"><\/span>What About BMS, Dry Contacts or Modbus?<span class=\"ez-toc-section-end\"><\/span><\/h2>\r\n\r\n  <p>\r\n    Commercial projects may require source status, switch-position information or alarms to be sent to a BMS or PLC.\r\n    That requirement should be defined during project specification.\r\n  <\/p>\r\n\r\n  <p>\r\n    The current public ATS-63 technical data does not list Modbus communication,\r\n    BMS integration or a defined set of remote status dry contacts as standard published functions. [4]\r\n  <\/p>\r\n\r\n  <div class=\"ly-evidence\">\r\n    <strong>Buyer meaning<\/strong>\r\n    If the project requires BMS, PLC, Modbus or dry-contact integration,\r\n    send the required signal list with the enquiry and obtain confirmation for the exact ordered configuration before the panel design is finalized.\r\n  <\/div>\r\n\r\n  <h2><span class=\"ez-toc-section\" id=\"what-changes-when-the-ats-is-installed-in-a-low-voltage-panel\"><\/span>What Changes When the ATS Is Installed in a Low-Voltage Panel?<span class=\"ez-toc-section-end\"><\/span><\/h2>\r\n\r\n  <p>\r\n    The ATS is only one device inside the complete assembly.\r\n    When it is integrated into a low-voltage power switchgear and controlgear assembly,\r\n    the finished assembly must be evaluated as an assembly rather than treating the ATS specification as approval of the whole panel.\r\n  <\/p>\r\n\r\n  <p>\r\n    IEC 61439-1:2020 provides general rules for low-voltage switchgear and controlgear assemblies,\r\n    while IEC 61439-2:2020 provides specific requirements for power switchgear and controlgear assemblies within its scope. [5][6]\r\n  <\/p>\r\n\r\n  <p>\r\n    The panel designer must therefore consider the complete arrangement,\r\n    including protection, conductors, short-circuit conditions, temperature rise, clearances,\r\n    enclosure design and the applicable verification requirements.\r\n  <\/p>\r\n\r\n  <h2><span class=\"ez-toc-section\" id=\"example-small-commercial-backup-panel\"><\/span>Example: Small Commercial Backup Panel<span class=\"ez-toc-section-end\"><\/span><\/h2>\r\n\r\n  <p>\r\n    Consider a small commercial facility that wants backup power for selected lighting,\r\n    security equipment, a network cabinet and control circuits.\r\n  <\/p>\r\n\r\n  <p>\r\n    The panel builder first calculates the transferred load.\r\n    Then the builder confirms system voltage, phase arrangement, 2P or 4P requirement,\r\n    load characteristics, protection and installation space.\r\n  <\/p>\r\n\r\n  <p>\r\n    If those conditions fall within the selected ATS-63 configuration\r\n    and the project does not require unsupported transfer or communication functions,\r\n    the compact DIN-rail ATS can be evaluated for the branch. [4]\r\n  <\/p>\r\n\r\n  <p>\r\n    If the project instead needs a 250A or 630A building main transfer system,\r\n    closed transition, bypass isolation or another specialized transfer function,\r\n    ATS-63 is outside that application direction.\r\n  <\/p>\r\n\r\n  <h2><span class=\"ez-toc-section\" id=\"common-commercial-ats-selection-mistakes\"><\/span>Common Commercial ATS Selection Mistakes<span class=\"ez-toc-section-end\"><\/span><\/h2>\r\n\r\n  <p class=\"ly-table-intro\">\r\n    The last column shows the information that should replace each common purchasing shortcut.\r\n  <\/p>\r\n\r\n  <div class=\"ly-table-wrap\">\r\n    <table>\r\n      <thead>\r\n        <tr>\r\n          <th>Shortcut<\/th>\r\n          <th>What It Misses<\/th>\r\n          <th>Better Confirmation<\/th>\r\n        <\/tr>\r\n      <\/thead>\r\n      <tbody>\r\n        <tr>\r\n          <td data-label=\"Shortcut\">\u201cI need 63A.\u201d<\/td>\r\n          <td data-label=\"What It Misses\">Voltage, poles, wiring and load duty<\/td>\r\n          <td data-label=\"Better Confirmation\">Send current, voltage, phase and wiring details<\/td>\r\n        <\/tr>\r\n        <tr>\r\n          <td data-label=\"Shortcut\">Use the building incomer rating<\/td>\r\n          <td data-label=\"What It Misses\">Actual backup branch<\/td>\r\n          <td data-label=\"Better Confirmation\">Calculate only the circuits transferred by this ATS<\/td>\r\n        <\/tr>\r\n        <tr>\r\n          <td data-label=\"Shortcut\">Ignore motor starting<\/td>\r\n          <td data-label=\"What It Misses\">Inrush and switching duty<\/td>\r\n          <td data-label=\"Better Confirmation\">Provide the actual load type and starting conditions<\/td>\r\n        <\/tr>\r\n        <tr>\r\n          <td data-label=\"Shortcut\">Choose 2P \/ 4P from phase count only<\/td>\r\n          <td data-label=\"What It Misses\">Neutral and earthing requirements<\/td>\r\n          <td data-label=\"Better Confirmation\">Review the approved system wiring<\/td>\r\n        <\/tr>\r\n        <tr>\r\n          <td data-label=\"Shortcut\">Treat ATS as UPS<\/td>\r\n          <td data-label=\"What It Misses\">Transfer interruption<\/td>\r\n          <td data-label=\"Better Confirmation\">Check the load's continuity requirement<\/td>\r\n        <\/tr>\r\n        <tr>\r\n          <td data-label=\"Shortcut\">Assume BMS or genset-start terminals<\/td>\r\n          <td data-label=\"What It Misses\">Exact controller I\/O<\/td>\r\n          <td data-label=\"Better Confirmation\">Send the required signal list before ordering<\/td>\r\n        <\/tr>\r\n      <\/tbody>\r\n    <\/table>\r\n  <\/div>\r\n\r\n  <p class=\"ly-table-note\">\r\n    Procurement conclusion: selecting the ATS by ampere rating alone is not enough for commercial panel approval.\r\n  <\/p>\r\n\r\n  <h2><span class=\"ez-toc-section\" id=\"what-should-you-send-before-ordering\"><\/span>What Should You Send Before Ordering?<span class=\"ez-toc-section-end\"><\/span><\/h2>\r\n\r\n  <p>\r\n    A useful commercial ATS enquiry should give LEEYEE enough information to check the application against the actual product scope.\r\n  <\/p>\r\n\r\n  <div class=\"ly-checklist-box\">\r\n    <h3>Commercial ATS Project Checklist<\/h3>\r\n\r\n    <ul class=\"ly-checklist\">\r\n      <li>Single-phase or three-phase system<\/li>\r\n      <li>Rated system voltage<\/li>\r\n      <li>50Hz or 60Hz<\/li>\r\n      <li>Calculated transferred-load current<\/li>\r\n      <li>Load type: lighting, electronics, motor, pump, etc.<\/li>\r\n      <li>Normal source type<\/li>\r\n      <li>Alternate source type<\/li>\r\n      <li>Required 2P or 4P configuration<\/li>\r\n      <li>Neutral switching requirement<\/li>\r\n      <li>Earthing arrangement<\/li>\r\n      <li>Upstream protective device<\/li>\r\n      <li>Available panel space<\/li>\r\n      <li>Single-line diagram<\/li>\r\n      <li>Wiring or panel drawing<\/li>\r\n      <li>Generator-start requirement, if any<\/li>\r\n      <li>BMS \/ dry-contact \/ communication requirement, if any<\/li>\r\n      <li>Required approval or documentation<\/li>\r\n      <li>Quantity and OEM requirement, if applicable<\/li>\r\n    <\/ul>\r\n  <\/div>\r\n\r\n  <div class=\"ly-cta\">\r\n    <h3>Need to confirm whether ATS-63 fits your commercial backup branch?<\/h3>\r\n\r\n    <p>\r\n      Send the system voltage, transferred-load current, 2P \/ 4P requirement,\r\n      source type, load type, panel space and available electrical drawings.\r\n      If you need generator-start or BMS signals, include the required I\/O list so the exact configuration can be checked rather than assumed.\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 Selection Support\">\r\n      <span class=\"w-btn-label\">Request ATS Selection Support<\/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>Can LEEYEE ATS-63 be used in a commercial building?<\/h3>\r\n    <p>\r\n      Yes, for a suitable small commercial backup branch when current, voltage, pole configuration,\r\n      load duty, protection and installation conditions match the selected ATS-63 configuration.\r\n      The published product range is 6A\u201363A. [4]\r\n    <\/p>\r\n  <\/div>\r\n\r\n  <div class=\"ly-faq-item\">\r\n    <h3>Can ATS-63 be used as the main ATS for a large hotel or shopping mall?<\/h3>\r\n    <p>\r\n      Not when the required transfer circuit exceeds the ATS-63 product scope.\r\n      ATS-63 is intended for compact backup systems and light-commercial applications rather than high-current main-building transfer switchgear. [4]\r\n    <\/p>\r\n  <\/div>\r\n\r\n  <div class=\"ly-faq-item\">\r\n    <h3>Can ATS-63 switch between utility and generator power?<\/h3>\r\n    <p>\r\n      Yes. The published ATS-63 application information includes generator backup,\r\n      provided the electrical parameters match the application. [4]\r\n      Generator-start control must be confirmed separately if the project requires it.\r\n    <\/p>\r\n  <\/div>\r\n\r\n  <div class=\"ly-faq-item\">\r\n    <h3>Does ATS-63 automatically start the generator?<\/h3>\r\n    <p>\r\n      Do not assume this from the standard product page or product image.\r\n      The current public ATS-63 specification does not publish a generator-start dry-contact function.\r\n      Confirm the exact controller and terminal documentation before specifying this function. [4]\r\n    <\/p>\r\n  <\/div>\r\n\r\n  <div class=\"ly-faq-item\">\r\n    <h3>Does ATS-63 support BMS, dry contacts or Modbus?<\/h3>\r\n    <p>\r\n      These functions are not listed as standard features in the current public ATS-63 technical data.\r\n      If the project requires them, send the required interface or signal list to LEEYEE for configuration confirmation before ordering. [4]\r\n    <\/p>\r\n  <\/div>\r\n\r\n  <div class=\"ly-faq-item\">\r\n    <h3>Should I use 2P or 4P?<\/h3>\r\n    <p>\r\n      ATS-63 is available in both 2P and 4P versions. [4]\r\n      Selection depends on the actual phase, neutral, earthing and project wiring arrangement.\r\n      Do not choose the pole number from current rating alone.\r\n    <\/p>\r\n  <\/div>\r\n\r\n  <div class=\"ly-faq-item\">\r\n    <h3>Does an open-transition ATS provide uninterrupted power?<\/h3>\r\n    <p>\r\n      No. Open transition uses break-before-make operation,\r\n      so the first source is disconnected before the second source is connected. [2]\r\n      Loads that cannot tolerate that interruption require another continuity solution.\r\n    <\/p>\r\n  <\/div>\r\n\r\n  <h2><span class=\"ez-toc-section\" id=\"final-selection-principle\"><\/span>Final Selection Principle<span class=\"ez-toc-section-end\"><\/span><\/h2>\r\n\r\n  <p>\r\n    For a commercial building, select the ATS from the\r\n    <strong>actual backup branch, not the size or name of the building<\/strong>.\r\n    First define the transferred loads. Then confirm current, voltage, phase arrangement,\r\n    neutral treatment, 2P \/ 4P configuration, source type, protection and installation space.\r\n  <\/p>\r\n\r\n  <p>\r\n    For small commercial backup panels within its published electrical scope,\r\n    LEEYEE ATS-63 provides a compact 2P \/ 4P DIN-rail transfer option.\r\n    Requirements outside that scope \u2014 including higher current, specialized transfer modes,\r\n    life-safety arrangements or unverified control interfaces \u2014 should be handled with an appropriately engineered solution.\r\n  <\/p>\r\n\r\n  <section 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\r\n    <ol>\r\n      <li>\r\n        IEC. <em>IEC 60947-6-1:2026 \u2014 Low-voltage switchgear and controlgear \u2014 Part 6-1:\r\n        Multiple function equipment \u2014 Transfer switching equipment.<\/em>\r\n        <a href=\"https:\/\/webstore.iec.ch\/en\/publication\/90494\" target=\"_blank\" rel=\"noopener noreferrer\">\r\n          IEC official publication page\r\n        <\/a>.\r\n      <\/li>\r\n\r\n      <li>\r\n        Eaton. <em>Fundamentals of Automatic Transfer Switches (ATS).<\/em>\r\n        Technical explanation of ATS operation and open-transition break-before-make transfer.\r\n        <a href=\"https:\/\/www.eaton.com\/sg\/en-us\/products\/low-voltage-power-distribution-control-systems\/automatic-transfer-switches\/automatic-transfer-switch-fundamentals.html\" target=\"_blank\" rel=\"noopener noreferrer\">\r\n          Eaton technical resource\r\n        <\/a>.\r\n      <\/li>\r\n\r\n      <li>\r\n        Schneider Electric. <em>TransferPacT Active Automatic and Automatic User Guide \u2014 Utility-Generator Operation.<\/em>\r\n        Official documentation describing a utility-generator sequence including genset-start signaling, transfer, retransfer and cooldown for that product family.\r\n        <a href=\"https:\/\/productinfo.se.com\/transferpactactiveautomaticandautomaticuserguide\/viewer?docidentity=UtilityToGeneratorOperation-9527916F&amp;extension=xml&amp;lang=en\" target=\"_blank\" rel=\"noopener noreferrer\">\r\n          Schneider Electric official documentation\r\n        <\/a>.\r\n      <\/li>\r\n\r\n      <li>\r\n        LEEYEE. <em>ATS-63 Automatic Transfer Switch 2P 4P 6A\u201363A for Backup Power Systems.<\/em>\r\n        Current published ATS-63 application and technical data.\r\n        <a href=\"https:\/\/www.cnspd.com\/products\/leeyee-automatic-transfer-switch-solar-backup\/\" target=\"_blank\" rel=\"noopener noreferrer\">\r\n          LEEYEE ATS-63 product page\r\n        <\/a>.\r\n      <\/li>\r\n\r\n      <li>\r\n        IEC. <em>IEC 61439-1:2020 \u2014 Low-voltage switchgear and controlgear assemblies \u2014 Part 1: General rules.<\/em>\r\n      <\/li>\r\n\r\n      <li>\r\n        IEC. <em>IEC 61439-2:2020 \u2014 Low-voltage switchgear and controlgear assemblies \u2014 Part 2: Power switchgear and controlgear assemblies.<\/em>\r\n      <\/li>\r\n    <\/ol>\r\n  <\/section>\r\n\r\n<\/div>\r\n\r\n<script>\r\ndocument.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(\r\n        '.w-popup.ush_popup_1 .w-popup-trigger'\r\n      );\r\n\r\n      if (realPopupTrigger) {\r\n        realPopupTrigger.click();\r\n      } else {\r\n        window.open(\r\n          'https:\/\/www.cnspd.com\/contact\/',\r\n          '_blank',\r\n          'noopener'\r\n        );\r\n      }\r\n    });\r\n  });\r\n});\r\n<\/script>\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>Commercial Building Backup Power GuideFor a commercial building, the right automatic transfer switch is selected from the backup circuit it actually supplies, not simply from the total electrical capacity of the building. This is especially important for compact 2P and 4P ATS products used in small commercial distribution boards and backup panels. This guide focuses&#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-31390","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>Commercial Building Automatic Transfer Switch Guide | LEEYEE<\/title>\n<meta name=\"description\" content=\"Learn how to select a compact automatic transfer switch for commercial building backup circuits, including 6A\u201363A sizing, 2P vs 4P, generator backup, panel integration and project control requirements.\" \/>\n<meta name=\"robots\" content=\"index, follow, max-snippet:-1, max-image-preview:large, max-video-preview:-1\" \/>\n<link rel=\"canonical\" href=\"https:\/\/www.cnspd.com\/id\/commercial-building-automatic-transfer-switch\/\" \/>\n<meta property=\"og:locale\" content=\"id_ID\" \/>\n<meta property=\"og:type\" content=\"article\" \/>\n<meta property=\"og:title\" content=\"Commercial Building Automatic Transfer Switch Guide | LEEYEE\" \/>\n<meta property=\"og:description\" content=\"Learn how to select a compact automatic transfer switch for commercial building backup circuits, including 6A\u201363A sizing, 2P vs 4P, generator backup, panel integration and project control requirements.\" \/>\n<meta property=\"og:url\" content=\"https:\/\/www.cnspd.com\/id\/commercial-building-automatic-transfer-switch\/\" \/>\n<meta property=\"og:site_name\" content=\"Surge Protector, Surge Arrestor, Isolating Switch - 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