{"id":29476,"date":"2026-06-22T10:41:19","date_gmt":"2026-06-22T02:41:19","guid":{"rendered":"https:\/\/www.cnspd.com\/?p=29476"},"modified":"2026-06-22T13:29:55","modified_gmt":"2026-06-22T05:29:55","slug":"what-is-an-automatic-transfer-switch-how-ats-works-how-to-choose","status":"publish","type":"post","link":"https:\/\/www.cnspd.com\/id\/apa-itu-saklar-transfer-otomatis-bagaimana-cara-kerja-ats-bagaimana-memilih\/","title":{"rendered":"Apa itu Saklar Transfer Otomatis? Bagaimana Cara Kerja ATS &amp; Cara Memilih"},"content":{"rendered":"\t\t<div data-elementor-type=\"wp-post\" data-elementor-id=\"29476\" class=\"elementor elementor-29476\" data-elementor-post-type=\"post\">\n\t\t\t\t<div class=\"elementor-element elementor-element-4e47fc5 e-flex e-con-boxed e-con e-parent\" data-id=\"4e47fc5\" 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-e99a507 elementor-widget elementor-widget-html\" data-id=\"e99a507\" 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  .ats-article {\r\n    max-width: 1120px;\r\n    margin: 0 auto;\r\n    color: #1f2933;\r\n    font-size: 16px;\r\n    line-height: 1.72;\r\n  }\r\n\r\n  .ats-article h1,\r\n  .ats-article h2,\r\n  .ats-article h3 {\r\n    color: #0f2742;\r\n    line-height: 1.3;\r\n    margin-top: 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border-radius: 999px;\r\n    padding: 6px 11px;\r\n    font-size: 13px;\r\n    font-weight: 700;\r\n    line-height: 1.2;\r\n    white-space: nowrap;\r\n  }\r\n\r\n  .lyd11-actions {\r\n    display: flex;\r\n    align-items: center;\r\n    gap: 10px;\r\n    flex-wrap: wrap;\r\n  }\r\n\r\n  .lyd11-btn-primary,\r\n  .lyd11-btn-secondary {\r\n    display: inline-block;\r\n    padding: 10px 17px;\r\n    border-radius: 10px;\r\n    font-size: 14px;\r\n    font-weight: 800;\r\n    text-decoration: none;\r\n  }\r\n\r\n  .lyd11-btn-primary {\r\n    background: #004898;\r\n    color: #fff !important;\r\n  }\r\n\r\n  .lyd11-btn-secondary {\r\n    background: #ffffff;\r\n    color: #344054 !important;\r\n    border: 1px solid #d0d5dd;\r\n  }\r\n\r\n  .lyd11-btn-primary:hover,\r\n  .lyd11-btn-secondary:hover {\r\n    transform: translateY(-1px);\r\n  }\r\n\r\n  @media (max-width: 768px) {\r\n    .ats-article {\r\n      width: 100% !important;\r\n      max-width: 100% !important;\r\n      padding: 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!important;\r\n    }\r\n\r\n    .ats-cta-actions {\r\n      flex-direction: column !important;\r\n      gap: 10px !important;\r\n    }\r\n\r\n    .ats-btn-white,\r\n    .ats-btn-outline {\r\n      width: 100% !important;\r\n      text-align: center !important;\r\n      box-sizing: border-box !important;\r\n    }\r\n\r\n    .lyd11 {\r\n      border-radius: 16px !important;\r\n      box-shadow: 0 8px 22px rgba(0, 72, 152, 0.08) !important;\r\n    }\r\n\r\n    .lyd11-inner {\r\n      flex-direction: column !important;\r\n      align-items: center !important;\r\n      padding: 22px 18px !important;\r\n      gap: 18px !important;\r\n    }\r\n\r\n    .lyd11-img {\r\n      width: 100% !important;\r\n      max-width: 280px !important;\r\n      margin: 0 auto !important;\r\n      padding: 8px !important;\r\n    }\r\n\r\n    .lyd11-body {\r\n      width: 100% !important;\r\n    }\r\n\r\n    .lyd11-title {\r\n      font-size: 20px !important;\r\n      line-height: 1.35 !important;\r\n    }\r\n\r\n    .lyd11-desc {\r\n      font-size: 15px !important;\r\n      line-height: 1.55 !important;\r\n    }\r\n\r\n    .lyd11-specs {\r\n      gap: 7px !important;\r\n      margin-bottom: 16px !important;\r\n    }\r\n\r\n    .lyd11-spec {\r\n      font-size: 12.5px !important;\r\n      padding: 6px 10px !important;\r\n      white-space: normal !important;\r\n    }\r\n\r\n    .lyd11-actions {\r\n      width: 100% !important;\r\n      display: flex !important;\r\n      flex-direction: column !important;\r\n      gap: 10px !important;\r\n    }\r\n\r\n    .lyd11-btn-primary,\r\n    .lyd11-btn-secondary {\r\n      width: 100% !important;\r\n      text-align: center !important;\r\n      box-sizing: border-box !important;\r\n      border-radius: 10px !important;\r\n    }\r\n  }\r\n\r\n  @media (max-width: 390px) {\r\n    .ats-article {\r\n      padding: 0 12px !important;\r\n    }\r\n\r\n    .ats-article h1 {\r\n      font-size: 28px !important;\r\n    }\r\n  }\r\n<\/style>\r\n\r\n<div class=\"ats-article\">\r\n\r\n  <figure class=\"ats-figure\">\r\n    <img decoding=\"async\" class=\"ats-hero-img\" src=\"https:\/\/www.cnspd.com\/wp-content\/uploads\/2026\/06\/Automatic-transfer-switch.png\" alt=\"What is an automatic transfer switch guide with 2P and 4P ATS for backup power systems\">\r\n  <\/figure>\r\n\r\n  <div class=\"ats-quick-answer\">\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\/apa-itu-saklar-transfer-otomatis-bagaimana-cara-kerja-ats-bagaimana-memilih\/#quick-answer\" >Quick Answer<\/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\/apa-itu-saklar-transfer-otomatis-bagaimana-cara-kerja-ats-bagaimana-memilih\/#key-takeaways\" >Key Takeaways<\/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\/apa-itu-saklar-transfer-otomatis-bagaimana-cara-kerja-ats-bagaimana-memilih\/#what-is-an-automatic-transfer-switch\" >What Is an Automatic Transfer Switch?<\/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\/apa-itu-saklar-transfer-otomatis-bagaimana-cara-kerja-ats-bagaimana-memilih\/#what-does-an-ats-do\" >What Does an ATS Do?<\/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\/apa-itu-saklar-transfer-otomatis-bagaimana-cara-kerja-ats-bagaimana-memilih\/#how-does-an-automatic-transfer-switch-work\" >How Does an Automatic Transfer Switch Work?<\/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\/apa-itu-saklar-transfer-otomatis-bagaimana-cara-kerja-ats-bagaimana-memilih\/#automatic-transfer-switch-example\" >Automatic Transfer Switch Example<\/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\/apa-itu-saklar-transfer-otomatis-bagaimana-cara-kerja-ats-bagaimana-memilih\/#manual-transfer-switch-vs-automatic-transfer-switch\" >Manual Transfer Switch vs Automatic Transfer Switch<\/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\/apa-itu-saklar-transfer-otomatis-bagaimana-cara-kerja-ats-bagaimana-memilih\/#main-ats-application-types\" >Main ATS Application Types<\/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\/apa-itu-saklar-transfer-otomatis-bagaimana-cara-kerja-ats-bagaimana-memilih\/#open-transition-vs-closed-transition-ats\" >Open Transition vs Closed Transition ATS<\/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\/apa-itu-saklar-transfer-otomatis-bagaimana-cara-kerja-ats-bagaimana-memilih\/#2p-vs-4p-automatic-transfer-switch\" >2P vs 4P Automatic Transfer Switch<\/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\/apa-itu-saklar-transfer-otomatis-bagaimana-cara-kerja-ats-bagaimana-memilih\/#how-to-choose-the-right-automatic-transfer-switch\" >How to Choose the Right Automatic Transfer Switch<\/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\/apa-itu-saklar-transfer-otomatis-bagaimana-cara-kerja-ats-bagaimana-memilih\/#key-specifications-to-check-before-buying-an-ats\" >Key Specifications to Check Before Buying an ATS<\/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\/apa-itu-saklar-transfer-otomatis-bagaimana-cara-kerja-ats-bagaimana-memilih\/#standards-and-compliance\" >Standards and Compliance<\/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\/apa-itu-saklar-transfer-otomatis-bagaimana-cara-kerja-ats-bagaimana-memilih\/#ats-vs-mts-vs-ups\" >ATS vs MTS vs UPS<\/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\/apa-itu-saklar-transfer-otomatis-bagaimana-cara-kerja-ats-bagaimana-memilih\/#does-an-ats-provide-overload-or-short-circuit-protection\" >Does an ATS Provide Overload or Short-Circuit Protection?<\/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\/apa-itu-saklar-transfer-otomatis-bagaimana-cara-kerja-ats-bagaimana-memilih\/#common-automatic-transfer-switch-applications\" >Common Automatic Transfer Switch Applications<\/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\/apa-itu-saklar-transfer-otomatis-bagaimana-cara-kerja-ats-bagaimana-memilih\/#leeyee-ats-63-automatic-transfer-switch\" >LEEYEE ATS-63 Automatic Transfer Switch<\/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\/apa-itu-saklar-transfer-otomatis-bagaimana-cara-kerja-ats-bagaimana-memilih\/#when-ats-63-is-a-good-fit\" >When ATS-63 Is a Good Fit<\/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\/id\/apa-itu-saklar-transfer-otomatis-bagaimana-cara-kerja-ats-bagaimana-memilih\/#when-ats-63-may-not-be-the-right-fit\" >When ATS-63 May Not Be the Right Fit<\/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\/id\/apa-itu-saklar-transfer-otomatis-bagaimana-cara-kerja-ats-bagaimana-memilih\/#common-mistakes-when-choosing-an-ats\" >Common Mistakes When Choosing an ATS<\/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\/id\/apa-itu-saklar-transfer-otomatis-bagaimana-cara-kerja-ats-bagaimana-memilih\/#when-should-you-use-an-automatic-transfer-switch\" >When Should You Use an Automatic Transfer Switch?<\/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\/id\/apa-itu-saklar-transfer-otomatis-bagaimana-cara-kerja-ats-bagaimana-memilih\/#frequently-asked-questions-about-automatic-transfer-switches\" >Frequently Asked Questions About Automatic Transfer Switches<\/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\/id\/apa-itu-saklar-transfer-otomatis-bagaimana-cara-kerja-ats-bagaimana-memilih\/#need-help-choosing-an-ats\" >Need Help Choosing an ATS?<\/a><\/li><li class='ez-toc-page-1 ez-toc-heading-level-2'><a class=\"ez-toc-link ez-toc-heading-24\" href=\"#\" data-href=\"https:\/\/www.cnspd.com\/id\/apa-itu-saklar-transfer-otomatis-bagaimana-cara-kerja-ats-bagaimana-memilih\/#conclusion\" >Conclusion<\/a><\/li><\/ul><\/nav><\/div>\n<h2><span class=\"ez-toc-section\" id=\"quick-answer\"><\/span>Quick Answer<span class=\"ez-toc-section-end\"><\/span><\/h2>\r\n    <p>An automatic transfer switch, or ATS, switches a load between two power sources.<\/p>\r\n    <p>When the main power fails, the ATS moves the load to backup power.<\/p>\r\n    <p>The backup source can be a generator, inverter, solar backup system, or another AC source.<\/p>\r\n    <p>When the main power comes back and becomes stable, the ATS switches the load back.<\/p>\r\n    <p>For LEEYEE ATS-63, the transfer switching time is less than 50 ms.<\/p>\r\n    <p>This is the ATS switching time only. A generator may still need extra time to start and stabilize.<\/p>\r\n  <\/div>\r\n\r\n  <div class=\"ats-key-box\">\r\n    <h2><span class=\"ez-toc-section\" id=\"key-takeaways\"><\/span>Key Takeaways<span class=\"ez-toc-section-end\"><\/span><\/h2>\r\n    <ul>\r\n      <li>An ATS switches a load between normal power and backup power.<\/li>\r\n      <li>A 2P ATS is commonly used for single-phase systems.<\/li>\r\n      <li>A 4P ATS is commonly used for three-phase systems.<\/li>\r\n      <li>Choose the ATS by current, voltage, pole number, and backup source.<\/li>\r\n      <li>An ATS is not a UPS. It does not store energy.<\/li>\r\n      <li>An ATS does not replace breakers, fuses, SPDs, or grounding.<\/li>\r\n      <li>LEEYEE ATS-63 is available in 2P \/ 4P and 6A\u201363A options.<\/li>\r\n    <\/ul>\r\n  <\/div>\r\n\r\n  <h2><span class=\"ez-toc-section\" id=\"what-is-an-automatic-transfer-switch\"><\/span>What Is an Automatic Transfer Switch?<span class=\"ez-toc-section-end\"><\/span><\/h2>\r\n\r\n  <p>An automatic transfer switch is a device for backup power systems.<\/p>\r\n  <p>It connects the load to one power source at a time. Usually, one source is normal power. The other source is backup power.<\/p>\r\n  <p>Normal power can be utility grid power. Backup power can be a generator, inverter, solar backup system, or another AC source.<\/p>\r\n  <p>The ATS watches the power sources. If normal power fails, the ATS switches the load to backup power when the backup source is ready.<\/p>\r\n  <p>The key idea is simple: an ATS is not just an on\/off switch. It is a source transfer device.<\/p>\r\n\r\n  <h2><span class=\"ez-toc-section\" id=\"what-does-an-ats-do\"><\/span>What Does an ATS Do?<span class=\"ez-toc-section-end\"><\/span><\/h2>\r\n\r\n  <p>An ATS keeps the load connected to the available power source.<\/p>\r\n  <p>In a simple backup system, the ATS does this:<\/p>\r\n\r\n  <ol>\r\n    <li>It monitors normal power.<\/li>\r\n    <li>It detects a power failure or unstable voltage.<\/li>\r\n    <li>It checks the backup source.<\/li>\r\n    <li>It transfers the load to backup power.<\/li>\r\n    <li>It transfers the load back when normal power returns.<\/li>\r\n  <\/ol>\r\n\r\n  <p>This reduces manual switching. It also helps keep important loads powered during an outage.<\/p>\r\n\r\n  <h2><span class=\"ez-toc-section\" id=\"how-does-an-automatic-transfer-switch-work\"><\/span>How Does an Automatic Transfer Switch Work?<span class=\"ez-toc-section-end\"><\/span><\/h2>\r\n\r\n  <p>An ATS monitors two power sources.<\/p>\r\n  <p>One source is the normal source. The other source is the backup source.<\/p>\r\n  <p>When normal power is available, the load stays on normal power.<\/p>\r\n  <p>When normal power fails, the ATS checks the backup source.<\/p>\r\n  <p>If the backup source is ready, the ATS transfers the load.<\/p>\r\n\r\n  <p>A typical ATS process looks like this:<\/p>\r\n\r\n  <ol>\r\n    <li>Utility power supplies the load.<\/li>\r\n    <li>Utility power fails or becomes unstable.<\/li>\r\n    <li>The ATS detects the problem.<\/li>\r\n    <li>The backup source becomes available.<\/li>\r\n    <li>The ATS transfers the load to backup power.<\/li>\r\n    <li>Utility power returns.<\/li>\r\n    <li>The ATS transfers the load back to utility power.<\/li>\r\n  <\/ol>\r\n\r\n  <figure class=\"ats-figure ats-zoom-figure\">\r\n    <a class=\"ats-img-zoom-link\" ref=\"magnificPopup\" href=\"https:\/\/www.cnspd.com\/wp-content\/uploads\/2026\/06\/How-automatic-transfer-switches-work.png\" target=\"_blank\" rel=\"noopener\" aria-label=\"Open larger ATS working process diagram\">\r\n      <img decoding=\"async\" class=\"ats-article-img\" src=\"https:\/\/www.cnspd.com\/wp-content\/uploads\/2026\/06\/How-automatic-transfer-switches-work.png\" alt=\"How a compact automatic transfer switch transfers load between utility power and generator or inverter backup source\">\r\n      <span class=\"ats-img-zoom-badge\">View larger<\/span>\r\n    <\/a>\r\n    <figcaption>How a compact automatic transfer switch transfers the load between utility power and backup power.<\/figcaption>\r\n  <\/figure>\r\n\r\n  <p>LEEYEE ATS-63 has a transfer switching time of less than 50 ms.<\/p>\r\n  <p>This does not mean the whole backup system recovers in 50 ms.<\/p>\r\n  <p>If the backup source is a generator, the generator still needs time to start and stabilize.<\/p>\r\n  <p>If the load cannot accept even a short power break, use a UPS or another power design.<\/p>\r\n\r\n  <h2><span class=\"ez-toc-section\" id=\"automatic-transfer-switch-example\"><\/span>Automatic Transfer Switch Example<span class=\"ez-toc-section-end\"><\/span><\/h2>\r\n\r\n  <p>Think about a small building with utility power and a backup generator.<\/p>\r\n  <p>Under normal conditions, the building runs on utility power.<\/p>\r\n  <p>When utility power fails, the backup generator starts. When the backup source is ready, the ATS transfers the load.<\/p>\r\n  <p>When utility power returns and becomes stable, the ATS transfers the load back.<\/p>\r\n  <p>The same idea can also be used with solar inverter backup systems, distribution boards, pump panels, and small control cabinets.<\/p>\r\n\r\n  <h2><span class=\"ez-toc-section\" id=\"manual-transfer-switch-vs-automatic-transfer-switch\"><\/span>Manual Transfer Switch vs Automatic Transfer Switch<span class=\"ez-toc-section-end\"><\/span><\/h2>\r\n\r\n  <p>A manual transfer switch needs a person to operate it.<\/p>\r\n  <p>An automatic transfer switch does the switching by itself.<\/p>\r\n\r\n  <div class=\"ats-table-wrap\">\r\n    <table>\r\n      <thead>\r\n        <tr>\r\n          <th>Type<\/th>\r\n          <th>How It Works<\/th>\r\n          <th>Typical Use<\/th>\r\n        <\/tr>\r\n      <\/thead>\r\n      <tbody>\r\n        <tr>\r\n          <td>Manual transfer switch<\/td>\r\n          <td>Switched by hand<\/td>\r\n          <td>Simple systems where manual switching is acceptable<\/td>\r\n        <\/tr>\r\n        <tr>\r\n          <td>Non-automatic transfer switch<\/td>\r\n          <td>Electrically operated, but manually controlled<\/td>\r\n          <td>Systems that need powered operation but not full automation<\/td>\r\n        <\/tr>\r\n        <tr>\r\n          <td>Automatic transfer switch<\/td>\r\n          <td>Switches automatically based on source status<\/td>\r\n          <td>Backup systems that need automatic power transfer<\/td>\r\n        <\/tr>\r\n      <\/tbody>\r\n    <\/table>\r\n  <\/div>\r\n\r\n  <h2><span class=\"ez-toc-section\" id=\"main-ats-application-types\"><\/span>Main ATS Application Types<span class=\"ez-toc-section-end\"><\/span><\/h2>\r\n\r\n  <p>An ATS can be used in different source arrangements. The right choice depends on the power system.<\/p>\r\n\r\n  <div class=\"ats-accordion\">\r\n    <details>\r\n      <summary>Utility to Generator<\/summary>\r\n      <div class=\"ats-accordion-content\">\r\n        <p>This is one of the most common ATS uses.<\/p>\r\n        <p>Normal power is utility power. Backup power is a generator.<\/p>\r\n        <p>When utility power fails, the ATS transfers the load to generator power. When utility power returns, it transfers the load back.<\/p>\r\n      <\/div>\r\n    <\/details>\r\n\r\n    <details>\r\n      <summary>Utility to Utility<\/summary>\r\n      <div class=\"ats-accordion-content\">\r\n        <p>In this setup, both sources are utility supplies.<\/p>\r\n        <p>If one source fails, the ATS transfers the load to the second source.<\/p>\r\n      <\/div>\r\n    <\/details>\r\n\r\n    <details>\r\n      <summary>Utility to Inverter or Solar Backup<\/summary>\r\n      <div class=\"ats-accordion-content\">\r\n        <p>Some solar or battery backup systems use an ATS to switch between grid power and inverter output.<\/p>\r\n        <p>Check the inverter voltage, frequency, grounding method, neutral wiring, and local code before selection.<\/p>\r\n      <\/div>\r\n    <\/details>\r\n  <\/div>\r\n\r\n  <h2><span class=\"ez-toc-section\" id=\"open-transition-vs-closed-transition-ats\"><\/span>Open Transition vs Closed Transition ATS<span class=\"ez-toc-section-end\"><\/span><\/h2>\r\n\r\n  <p>Transfer switches are often described as open transition or closed transition.<\/p>\r\n\r\n  <div class=\"ats-accordion\">\r\n    <details>\r\n      <summary>Open Transition ATS<\/summary>\r\n      <div class=\"ats-accordion-content\">\r\n        <p>Open transition means break-before-make.<\/p>\r\n        <p>The ATS disconnects from one source before it connects to the other source.<\/p>\r\n        <p>This is common in general backup power systems. A short interruption may happen during transfer.<\/p>\r\n      <\/div>\r\n    <\/details>\r\n\r\n    <details>\r\n      <summary>Closed Transition ATS<\/summary>\r\n      <div class=\"ats-accordion-content\">\r\n        <p>Closed transition means make-before-break.<\/p>\r\n        <p>It briefly connects two synchronized sources before disconnecting from the first source.<\/p>\r\n        <p>This is a more complex system. It is usually used in larger engineered power systems.<\/p>\r\n      <\/div>\r\n    <\/details>\r\n  <\/div>\r\n\r\n  <div class=\"ats-note\">\r\n    <h3>Important Note for Compact ATS Products<\/h3>\r\n    <p>Do not assume every ATS supports closed transition.<\/p>\r\n    <p>Compact DIN-rail ATS products are mainly used for general backup source switching.<\/p>\r\n    <p>If your project needs zero interruption or source synchronization, use a different engineered power solution.<\/p>\r\n  <\/div>\r\n\r\n  <h2><span class=\"ez-toc-section\" id=\"2p-vs-4p-automatic-transfer-switch\"><\/span>2P vs 4P Automatic Transfer Switch<span class=\"ez-toc-section-end\"><\/span><\/h2>\r\n\r\n  <p>Pole number is one of the most important ATS selection points.<\/p>\r\n  <p>Do not choose only by current rating. A 63A ATS may still be wrong if the pole number does not match the wiring.<\/p>\r\n\r\n  <h3>What Is a 2P ATS?<\/h3>\r\n\r\n  <p>A 2P ATS has two switching poles.<\/p>\r\n  <p>It is commonly used for single-phase systems where Line and Neutral need to be switched.<\/p>\r\n\r\n  <p>Typical 2P ATS applications include:<\/p>\r\n\r\n  <ul>\r\n    <li>Home backup systems<\/li>\r\n    <li>Small shops<\/li>\r\n    <li>Small offices<\/li>\r\n    <li>Single-phase generator backup<\/li>\r\n    <li>Single-phase inverter backup<\/li>\r\n    <li>Residential distribution boards<\/li>\r\n  <\/ul>\r\n\r\n  <h3>What Is a 4P ATS?<\/h3>\r\n\r\n  <p>A 4P ATS has four switching poles.<\/p>\r\n  <p>It is commonly used for three-phase systems where L1, L2, L3, and Neutral need to be switched.<\/p>\r\n\r\n  <p>Typical 4P ATS applications include:<\/p>\r\n\r\n  <ul>\r\n    <li>Three-phase commercial systems<\/li>\r\n    <li>Small factories<\/li>\r\n    <li>Control cabinets<\/li>\r\n    <li>Three-phase generator backup<\/li>\r\n    <li>Pump control panels<\/li>\r\n    <li>Distribution boards that require neutral switching<\/li>\r\n  <\/ul>\r\n\r\n  <h3>2P vs 4P ATS Selection Table<\/h3>\r\n\r\n  <div class=\"ats-table-wrap\">\r\n    <table>\r\n      <thead>\r\n        <tr>\r\n          <th>System Type<\/th>\r\n          <th>Common ATS Choice<\/th>\r\n          <th>Notes<\/th>\r\n        <\/tr>\r\n      <\/thead>\r\n      <tbody>\r\n        <tr>\r\n          <td>Single-phase AC system<\/td>\r\n          <td>2P ATS<\/td>\r\n          <td>Common for homes, shops, and small offices<\/td>\r\n        <\/tr>\r\n        <tr>\r\n          <td>Single-phase generator backup<\/td>\r\n          <td>2P ATS<\/td>\r\n          <td>Used for L + N switching<\/td>\r\n        <\/tr>\r\n        <tr>\r\n          <td>Three-phase AC system<\/td>\r\n          <td>4P ATS<\/td>\r\n          <td>Used for L1 + L2 + L3 + N switching<\/td>\r\n        <\/tr>\r\n        <tr>\r\n          <td>Three-phase generator backup<\/td>\r\n          <td>4P ATS<\/td>\r\n          <td>Common in control cabinets and distribution systems<\/td>\r\n        <\/tr>\r\n        <tr>\r\n          <td>Inverter backup system<\/td>\r\n          <td>2P or 4P<\/td>\r\n          <td>Depends on inverter output and wiring design<\/td>\r\n        <\/tr>\r\n      <\/tbody>\r\n    <\/table>\r\n  <\/div>\r\n\r\n  <figure class=\"ats-figure ats-zoom-figure\">\r\n    <a class=\"ats-img-zoom-link\" ref=\"magnificPopup\" href=\"https:\/\/www.cnspd.com\/wp-content\/uploads\/2026\/06\/2P-vs-4P-ATS-comparison-guide.png\" target=\"_blank\" rel=\"noopener\" aria-label=\"Open larger 2P vs 4P ATS comparison diagram\">\r\n      <img decoding=\"async\" class=\"ats-article-img\" src=\"https:\/\/www.cnspd.com\/wp-content\/uploads\/2026\/06\/2P-vs-4P-ATS-comparison-guide.png\" alt=\"2P vs 4P ATS pole configuration for single-phase and three-phase systems\">\r\n      <span class=\"ats-img-zoom-badge\">View larger<\/span>\r\n    <\/a>\r\n    <figcaption>2P and 4P ATS pole configuration difference for single-phase and three-phase backup power systems.<\/figcaption>\r\n  <\/figure>\r\n\r\n  <p>Simple rule: use 2P for many single-phase systems. Use 4P for many three-phase systems.<\/p>\r\n  <p>Final selection should always follow the actual wiring design.<\/p>\r\n\r\n  <h2><span class=\"ez-toc-section\" id=\"how-to-choose-the-right-automatic-transfer-switch\"><\/span>How to Choose the Right Automatic Transfer Switch<span class=\"ez-toc-section-end\"><\/span><\/h2>\r\n\r\n  <p>Start with the power system. Then choose the ATS.<\/p>\r\n\r\n  <h3>1. Confirm the Phase Type<\/h3>\r\n  <p>Is the system single-phase or three-phase?<\/p>\r\n  <p>Many single-phase systems use 2P. Many three-phase systems use 4P.<\/p>\r\n\r\n  <h3>2. Confirm the Load Current<\/h3>\r\n  <p>The ATS current rating must match or exceed the load current.<\/p>\r\n  <p>LEEYEE ATS-63 is available in 6A, 10A, 16A, 20A, 25A, 32A, 40A, 50A, and 63A.<\/p>\r\n  <p>For motors, pumps, and compressors, also check starting current.<\/p>\r\n\r\n  <h3>3. Confirm the System Voltage<\/h3>\r\n  <p>The ATS voltage rating must match the system voltage.<\/p>\r\n  <p>LEEYEE ATS-63 supports AC110V, AC220V, AC400V, and 50\/60Hz configurations.<\/p>\r\n\r\n  <h3>4. Confirm the Backup Source<\/h3>\r\n  <p>The backup source may be a generator, inverter, solar backup system, utility backup, or another AC source.<\/p>\r\n  <p>For inverter and solar systems, check neutral wiring, grounding, and local code.<\/p>\r\n\r\n  <h3>5. Confirm the Transfer Switching Time<\/h3>\r\n  <p>Transfer switching time tells you how fast the ATS changes from one source to another.<\/p>\r\n  <p>LEEYEE ATS-63 transfer switching time is less than 50 ms.<\/p>\r\n  <p>This is not the same as total backup recovery time. A generator may need extra time to start.<\/p>\r\n\r\n  <h3>6. Confirm Manual and Automatic Operation<\/h3>\r\n  <p>Compact ATS products often support both manual and automatic operation.<\/p>\r\n  <p>Manual operation is useful for testing and maintenance. Automatic operation is used for normal backup switching.<\/p>\r\n\r\n  <h3>7. Confirm Installation Conditions<\/h3>\r\n  <p>Check DIN-rail space, wiring space, terminal access, heat dissipation, cabinet layout, and installation environment.<\/p>\r\n\r\n  <figure class=\"ats-figure ats-zoom-figure\">\r\n    <a class=\"ats-img-zoom-link\" ref=\"magnificPopup\" href=\"https:\/\/www.cnspd.com\/wp-content\/uploads\/2026\/06\/How-to-choose-the-right-ATS.png\" target=\"_blank\" rel=\"noopener\" aria-label=\"Open larger ATS selection flowchart\">\r\n      <img decoding=\"async\" class=\"ats-article-img\" src=\"https:\/\/www.cnspd.com\/wp-content\/uploads\/2026\/06\/How-to-choose-the-right-ATS.png\" alt=\"Automatic transfer switch selection flowchart for choosing 2P or 4P ATS by phase type current voltage and backup source\">\r\n      <span class=\"ats-img-zoom-badge\">View larger<\/span>\r\n    <\/a>\r\n    <figcaption>ATS selection flowchart for choosing the right automatic transfer switch by phase type, current, voltage, and backup source.<\/figcaption>\r\n  <\/figure>\r\n\r\n  <h2><span class=\"ez-toc-section\" id=\"key-specifications-to-check-before-buying-an-ats\"><\/span>Key Specifications to Check Before Buying an ATS<span class=\"ez-toc-section-end\"><\/span><\/h2>\r\n\r\n  <div class=\"ats-table-wrap\">\r\n    <table>\r\n      <thead>\r\n        <tr>\r\n          <th>Specification<\/th>\r\n          <th>What to Confirm<\/th>\r\n        <\/tr>\r\n      <\/thead>\r\n      <tbody>\r\n        <tr>\r\n          <td>Rated voltage<\/td>\r\n          <td>Must match the system voltage<\/td>\r\n        <\/tr>\r\n        <tr>\r\n          <td>Rated current<\/td>\r\n          <td>Must match or exceed the load current<\/td>\r\n        <\/tr>\r\n        <tr>\r\n          <td>Pole configuration<\/td>\r\n          <td>Choose 2P or 4P by phase type and wiring method<\/td>\r\n        <\/tr>\r\n        <tr>\r\n          <td>Frequency<\/td>\r\n          <td>Check 50Hz or 60Hz<\/td>\r\n        <\/tr>\r\n        <tr>\r\n          <td>Transfer switching time<\/td>\r\n          <td>LEEYEE ATS-63 transfer switching time is &lt;50 ms<\/td>\r\n        <\/tr>\r\n        <tr>\r\n          <td>Backup source<\/td>\r\n          <td>Generator, inverter, solar backup, utility backup, or other AC source<\/td>\r\n        <\/tr>\r\n        <tr>\r\n          <td>Protection design<\/td>\r\n          <td>Use proper breakers, fuses, SPDs, grounding, and cable sizing<\/td>\r\n        <\/tr>\r\n        <tr>\r\n          <td>Wiring diagram<\/td>\r\n          <td>Must match the actual system design<\/td>\r\n        <\/tr>\r\n      <\/tbody>\r\n    <\/table>\r\n  <\/div>\r\n\r\n  <p>A reliable supplier should provide technical data, dimensions, wiring diagrams, and selection support.<\/p>\r\n\r\n  <h2><span class=\"ez-toc-section\" id=\"standards-and-compliance\"><\/span>Standards and Compliance<span class=\"ez-toc-section-end\"><\/span><\/h2>\r\n\r\n  <p>Buyers often ask for CE and RoHS documentation for compact ATS products.<\/p>\r\n  <p>CE relates to applicable European conformity requirements for the declared product category.<\/p>\r\n  <p>RoHS relates to restricted hazardous substances in electrical and electronic equipment.<\/p>\r\n  <p>LEEYEE automatic transfer switches can be supplied with CE and RoHS documentation.<\/p>\r\n  <p>Project requirements can vary by country. For regulated installations, confirm local standards before ordering.<\/p>\r\n\r\n  <h2><span class=\"ez-toc-section\" id=\"ats-vs-mts-vs-ups\"><\/span>ATS vs MTS vs UPS<span class=\"ez-toc-section-end\"><\/span><\/h2>\r\n\r\n  <p>ATS, MTS, and UPS devices do different jobs.<\/p>\r\n\r\n  <div class=\"ats-table-wrap\">\r\n    <table>\r\n      <thead>\r\n        <tr>\r\n          <th>Device<\/th>\r\n          <th>Full Name<\/th>\r\n          <th>Main Function<\/th>\r\n        <\/tr>\r\n      <\/thead>\r\n      <tbody>\r\n        <tr>\r\n          <td>ATS<\/td>\r\n          <td>Automatic Transfer Switch<\/td>\r\n          <td>Automatically switches the load between two power sources<\/td>\r\n        <\/tr>\r\n        <tr>\r\n          <td>MTS<\/td>\r\n          <td>Manual Transfer Switch<\/td>\r\n          <td>Switches the load by manual operation<\/td>\r\n        <\/tr>\r\n        <tr>\r\n          <td>UPS<\/td>\r\n          <td>Uninterruptible Power Supply<\/td>\r\n          <td>Provides temporary battery power during an interruption<\/td>\r\n        <\/tr>\r\n      <\/tbody>\r\n    <\/table>\r\n  <\/div>\r\n\r\n  <p>An ATS does not store energy. It only transfers the load.<\/p>\r\n  <p>A UPS stores energy in batteries. Some systems use an ATS and a UPS together.<\/p>\r\n\r\n  <h2><span class=\"ez-toc-section\" id=\"does-an-ats-provide-overload-or-short-circuit-protection\"><\/span>Does an ATS Provide Overload or Short-Circuit Protection?<span class=\"ez-toc-section-end\"><\/span><\/h2>\r\n\r\n  <p>No.<\/p>\r\n  <p>An ATS transfers the load between power sources. It does not replace circuit protection devices.<\/p>\r\n  <p>A complete system should include the right breakers, fuses, surge protection, grounding, and cable sizing.<\/p>\r\n\r\n  <h2><span class=\"ez-toc-section\" id=\"common-automatic-transfer-switch-applications\"><\/span>Common Automatic Transfer Switch Applications<span class=\"ez-toc-section-end\"><\/span><\/h2>\r\n\r\n  <div class=\"ats-accordion\">\r\n    <details>\r\n      <summary>Home Backup Power<\/summary>\r\n      <div class=\"ats-accordion-content\">\r\n        <p>An ATS can switch selected home circuits from utility power to generator or inverter backup.<\/p>\r\n        <p>Typical loads include lighting, refrigerators, routers, water pumps, and security systems.<\/p>\r\n      <\/div>\r\n    <\/details>\r\n\r\n    <details>\r\n      <summary>Small Shops and Offices<\/summary>\r\n      <div class=\"ats-accordion-content\">\r\n        <p>Small commercial users may need backup power for lighting, cash registers, communication devices, refrigeration, or security systems.<\/p>\r\n      <\/div>\r\n    <\/details>\r\n\r\n    <details>\r\n      <summary>Generator Backup Systems<\/summary>\r\n      <div class=\"ats-accordion-content\">\r\n        <p>The ATS transfers the load to generator power when utility power fails.<\/p>\r\n        <p>It transfers the load back when utility power returns.<\/p>\r\n      <\/div>\r\n    <\/details>\r\n\r\n    <details>\r\n      <summary>Solar and Inverter Backup Systems<\/summary>\r\n      <div class=\"ats-accordion-content\">\r\n        <p>Some solar or battery backup systems use an ATS to switch between grid power and inverter output.<\/p>\r\n        <p>Always check inverter output, neutral wiring, grounding, load type, and local code.<\/p>\r\n      <\/div>\r\n    <\/details>\r\n\r\n    <details>\r\n      <summary>Pump Control Systems<\/summary>\r\n      <div class=\"ats-accordion-content\">\r\n        <p>Pumps may need backup power in irrigation, drainage, and control cabinet systems.<\/p>\r\n        <p>For pump loads, check running current and starting current.<\/p>\r\n      <\/div>\r\n    <\/details>\r\n\r\n    <details>\r\n      <summary>Telecom Cabinets<\/summary>\r\n      <div class=\"ats-accordion-content\">\r\n        <p>Compact ATS products can be used in telecom cabinets and remote equipment rooms.<\/p>\r\n      <\/div>\r\n    <\/details>\r\n\r\n    <details>\r\n      <summary>Control Cabinets and Distribution Boards<\/summary>\r\n      <div class=\"ats-accordion-content\">\r\n        <p>An ATS can support auxiliary circuits, monitoring systems, fans, small motors, and backup circuits.<\/p>\r\n      <\/div>\r\n    <\/details>\r\n  <\/div>\r\n\r\n  <h2><span class=\"ez-toc-section\" id=\"leeyee-ats-63-automatic-transfer-switch\"><\/span>LEEYEE ATS-63 Automatic Transfer Switch<span class=\"ez-toc-section-end\"><\/span><\/h2>\r\n\r\n  <p>LEEYEE provides the ATS-63 series for compact backup power systems.<\/p>\r\n  <p>It is suitable for generator backup, solar inverter backup, small distribution systems, and control cabinets.<\/p>\r\n  <p>ATS-63 is a compact DIN-rail automatic transfer switch. It switches between power A and power B in AC systems.<\/p>\r\n  <p>It is available in 2P and 4P versions for single-phase and three-phase applications.<\/p>\r\n\r\n  <div class=\"lyd11\" style=\"margin:24px 0 32px;\">\r\n    <div class=\"lyd11-bar\"><\/div>\r\n    <div class=\"lyd11-inner\">\r\n\r\n      <img decoding=\"async\" class=\"lyd11-img\" src=\"https:\/\/www.cnspd.com\/wp-content\/uploads\/2026\/06\/2.png\" alt=\"LEEYEE ATS-63 automatic transfer switch for solar backup generator and grid power systems\" \/>\r\n\r\n      <div class=\"lyd11-body\">\r\n        <div class=\"lyd11-title-row\">\r\n          <span class=\"lyd11-title\">ATS-63 Automatic Transfer Switch for Backup Power<\/span>\r\n          <span class=\"lyd11-badge\">2P \/ 4P<\/span>\r\n        <\/div>\r\n\r\n        <div class=\"lyd11-desc\">Compact DIN-rail ATS for generator backup, solar inverter backup, grid power switching, and small distribution systems.<\/div>\r\n\r\n        <div class=\"lyd11-specs\">\r\n          <span class=\"lyd11-spec\">6A\u201363A<\/span>\r\n          <span class=\"lyd11-spec\">AC110V \/ 220V \/ 400V<\/span>\r\n          <span class=\"lyd11-spec\">&lt;50 ms transfer<\/span>\r\n          <span class=\"lyd11-spec\">DIN rail<\/span>\r\n          <span class=\"lyd11-spec\">CE \/ RoHS<\/span>\r\n        <\/div>\r\n\r\n        <div class=\"lyd11-actions\">\r\n          <a class=\"lyd11-btn-primary\" href=\"https:\/\/www.cnspd.com\/products\/leeyee-automatic-transfer-switch-solar-backup\/\" target=\"_blank\" rel=\"noopener\">View Product<\/a>\r\n          <a class=\"lyd11-btn-secondary open-contact\" href=\"javascript:void(0);\">Get Quote<\/a>\r\n        <\/div>\r\n      <\/div>\r\n\r\n    <\/div>\r\n  <\/div>\r\n\r\n  <p>For full technical data, wiring details, and dimensions, view the ATS-63 product page or contact LEEYEE for selection support.<\/p>\r\n\r\n  <div class=\"ats-product-note\">\r\n    <h2><span class=\"ez-toc-section\" id=\"when-ats-63-is-a-good-fit\"><\/span>When ATS-63 Is a Good Fit<span class=\"ez-toc-section-end\"><\/span><\/h2>\r\n    <p>ATS-63 is a good fit for compact AC backup systems.<\/p>\r\n    <p>Typical uses include home backup, generator backup, and solar inverter backup.<\/p>\r\n    <p>It can also be used in small shops, light commercial distribution, control panels, and telecom cabinets.<\/p>\r\n    <p>Use it only when the current, voltage, pole number, wiring method, and transfer requirements match the system.<\/p>\r\n  <\/div>\r\n\r\n  <div class=\"ats-note\">\r\n    <h2><span class=\"ez-toc-section\" id=\"when-ats-63-may-not-be-the-right-fit\"><\/span>When ATS-63 May Not Be the Right Fit<span class=\"ez-toc-section-end\"><\/span><\/h2>\r\n    <p>ATS-63 is not a large power transfer system.<\/p>\r\n    <p>ATS-63 is not suitable for every system.<\/p>\r\n    <p>It is not intended for systems above 63A, data centers, hospitals, zero-interruption loads, or closed transition systems.<\/p>\r\n    <p>It also does not provide overload protection by itself.<\/p>\r\n    <p>For those projects, use a larger engineered transfer solution.<\/p>\r\n  <\/div>\r\n\r\n  <h2><span class=\"ez-toc-section\" id=\"common-mistakes-when-choosing-an-ats\"><\/span>Common Mistakes When Choosing an ATS<span class=\"ez-toc-section-end\"><\/span><\/h2>\r\n\r\n  <div class=\"ats-accordion\">\r\n    <details>\r\n      <summary>Choosing Only by Current Rating<\/summary>\r\n      <div class=\"ats-accordion-content\">\r\n        <p>\u201cI need a 63A ATS\u201d is not enough.<\/p>\r\n        <p>You also need voltage, phase type, pole number, backup source, wiring method, and transfer time.<\/p>\r\n      <\/div>\r\n    <\/details>\r\n\r\n    <details>\r\n      <summary>Using 2P ATS in a Three-Phase System<\/summary>\r\n      <div class=\"ats-accordion-content\">\r\n        <p>A 2P ATS is not suitable for a standard three-phase system that needs four-pole switching.<\/p>\r\n      <\/div>\r\n    <\/details>\r\n\r\n    <details>\r\n      <summary>Ignoring Neutral Switching<\/summary>\r\n      <div class=\"ats-accordion-content\">\r\n        <p>Neutral switching depends on the grounding system, generator design, inverter wiring, and local code.<\/p>\r\n      <\/div>\r\n    <\/details>\r\n\r\n    <details>\r\n      <summary>Undersizing the ATS<\/summary>\r\n      <div class=\"ats-accordion-content\">\r\n        <p>The ATS should not operate above its rated current.<\/p>\r\n        <p>For motors and pumps, also check starting current.<\/p>\r\n      <\/div>\r\n    <\/details>\r\n\r\n    <details>\r\n      <summary>Treating ATS as a UPS<\/summary>\r\n      <div class=\"ats-accordion-content\">\r\n        <p>An ATS does not provide battery backup.<\/p>\r\n        <p>If the load cannot accept a short power break, use a UPS.<\/p>\r\n      <\/div>\r\n    <\/details>\r\n\r\n    <details>\r\n      <summary>Forgetting Protection Devices<\/summary>\r\n      <div class=\"ats-accordion-content\">\r\n        <p>An ATS does not replace breakers, fuses, or surge protection.<\/p>\r\n      <\/div>\r\n    <\/details>\r\n  <\/div>\r\n\r\n  <h2><span class=\"ez-toc-section\" id=\"when-should-you-use-an-automatic-transfer-switch\"><\/span>When Should You Use an Automatic Transfer Switch?<span class=\"ez-toc-section-end\"><\/span><\/h2>\r\n\r\n  <p>Use an ATS when a load needs to switch automatically to backup power after the main supply fails.<\/p>\r\n  <p>An ATS is suitable when two AC power sources are available and manual switching is too slow or inconvenient.<\/p>\r\n  <p>It may not be enough for zero-interruption loads, unstable backup sources, unclear wiring systems, or oversized loads.<\/p>\r\n  <p>For sensitive electronics, use an ATS together with a UPS if needed.<\/p>\r\n\r\n  <h2><span class=\"ez-toc-section\" id=\"frequently-asked-questions-about-automatic-transfer-switches\"><\/span>Frequently Asked Questions About Automatic Transfer Switches<span class=\"ez-toc-section-end\"><\/span><\/h2>\r\n\r\n  <div class=\"ats-accordion\">\r\n\r\n    <details>\r\n      <summary>What is the purpose of an automatic transfer switch?<\/summary>\r\n      <div class=\"ats-accordion-content\">\r\n        <p>It transfers the load from normal power to backup power when normal power fails.<\/p>\r\n      <\/div>\r\n    <\/details>\r\n\r\n    <details>\r\n      <summary>What is an automatic transfer switch used for?<\/summary>\r\n      <div class=\"ats-accordion-content\">\r\n        <p>It is used for backup power switching in homes, small buildings, generator systems, and solar inverter backup systems.<\/p>\r\n        <p>It can also be used in control panels, distribution boards, and telecom cabinets.<\/p>\r\n      <\/div>\r\n    <\/details>\r\n\r\n    <details>\r\n      <summary>How does an automatic transfer switch work?<\/summary>\r\n      <div class=\"ats-accordion-content\">\r\n        <p>It monitors the normal source and backup source.<\/p>\r\n        <p>When normal power fails and backup power is ready, the ATS transfers the load.<\/p>\r\n      <\/div>\r\n    <\/details>\r\n\r\n    <details>\r\n      <summary>What happens when utility power comes back?<\/summary>\r\n      <div class=\"ats-accordion-content\">\r\n        <p>The ATS transfers the load back to utility power after the source becomes stable.<\/p>\r\n      <\/div>\r\n    <\/details>\r\n\r\n    <details>\r\n      <summary>Can an ATS work without a generator?<\/summary>\r\n      <div class=\"ats-accordion-content\">\r\n        <p>Yes. It can switch between grid power and inverter power, solar backup, two utility sources, or other AC sources.<\/p>\r\n      <\/div>\r\n    <\/details>\r\n\r\n    <details>\r\n      <summary>Is an ATS required for a generator?<\/summary>\r\n      <div class=\"ats-accordion-content\">\r\n        <p>Not always.<\/p>\r\n        <p>But an ATS is useful when automatic generator backup transfer is needed.<\/p>\r\n      <\/div>\r\n    <\/details>\r\n\r\n    <details>\r\n      <summary>Can an ATS switch between grid and solar inverter?<\/summary>\r\n      <div class=\"ats-accordion-content\">\r\n        <p>Yes, in some systems.<\/p>\r\n        <p>Check inverter output, voltage, frequency, neutral wiring, grounding, and local code first.<\/p>\r\n      <\/div>\r\n    <\/details>\r\n\r\n    <details>\r\n      <summary>How fast does an ATS switch?<\/summary>\r\n      <div class=\"ats-accordion-content\">\r\n        <p>Switching time depends on the ATS design and source condition.<\/p>\r\n        <p>LEEYEE ATS-63 transfer switching time is less than 50 ms.<\/p>\r\n      <\/div>\r\n    <\/details>\r\n\r\n    <details>\r\n      <summary>What is the transfer switching time of LEEYEE ATS-63?<\/summary>\r\n      <div class=\"ats-accordion-content\">\r\n        <p>It is less than 50 ms according to the product manual.<\/p>\r\n        <p>This is the ATS switching time only. Generator start-up time is separate.<\/p>\r\n      <\/div>\r\n    <\/details>\r\n\r\n    <details>\r\n      <summary>What is the difference between ATS and UPS?<\/summary>\r\n      <div class=\"ats-accordion-content\">\r\n        <p>An ATS transfers the load between two power sources.<\/p>\r\n        <p>A UPS provides battery power during an interruption.<\/p>\r\n      <\/div>\r\n    <\/details>\r\n\r\n    <details>\r\n      <summary>What is the difference between 2P and 4P ATS?<\/summary>\r\n      <div class=\"ats-accordion-content\">\r\n        <p>A 2P ATS is commonly used for single-phase systems.<\/p>\r\n        <p>A 4P ATS is commonly used for three-phase systems that switch L1, L2, L3, and Neutral.<\/p>\r\n      <\/div>\r\n    <\/details>\r\n\r\n    <details>\r\n      <summary>Can a 2P ATS be used for a three-phase system?<\/summary>\r\n      <div class=\"ats-accordion-content\">\r\n        <p>No.<\/p>\r\n        <p>A standard three-phase system needs three-phase or four-pole switching.<\/p>\r\n      <\/div>\r\n    <\/details>\r\n\r\n    <details>\r\n      <summary>What size automatic transfer switch do I need?<\/summary>\r\n      <div class=\"ats-accordion-content\">\r\n        <p>Choose by load current, voltage, pole number, source type, wiring method, and transfer requirement.<\/p>\r\n      <\/div>\r\n    <\/details>\r\n\r\n    <details>\r\n      <summary>Can ATS-63 be used for home backup power?<\/summary>\r\n      <div class=\"ats-accordion-content\">\r\n        <p>Yes, when the voltage, current, pole number, and wiring method match the home backup system.<\/p>\r\n      <\/div>\r\n    <\/details>\r\n\r\n    <details>\r\n      <summary>Can ATS-63 be used for generator backup?<\/summary>\r\n      <div class=\"ats-accordion-content\">\r\n        <p>Yes, if the system parameters and wiring design match the ATS rating.<\/p>\r\n      <\/div>\r\n    <\/details>\r\n\r\n    <details>\r\n      <summary>Can ATS-63 be used for solar backup systems?<\/summary>\r\n      <div class=\"ats-accordion-content\">\r\n        <p>Yes, in some solar or inverter backup systems.<\/p>\r\n        <p>Check inverter output, voltage, frequency, neutral switching, and wiring method before selection.<\/p>\r\n      <\/div>\r\n    <\/details>\r\n\r\n    <details>\r\n      <summary>What certifications are available for LEEYEE ATS?<\/summary>\r\n      <div class=\"ats-accordion-content\">\r\n        <p>LEEYEE automatic transfer switches can be supplied with CE and RoHS documentation.<\/p>\r\n      <\/div>\r\n    <\/details>\r\n\r\n    <details>\r\n      <summary>Does an ATS provide surge protection?<\/summary>\r\n      <div class=\"ats-accordion-content\">\r\n        <p>No. Surge protection requires a separate surge protective device.<\/p>\r\n      <\/div>\r\n    <\/details>\r\n\r\n    <details>\r\n      <summary>Does an ATS provide overload or short-circuit protection?<\/summary>\r\n      <div class=\"ats-accordion-content\">\r\n        <p>No. Use suitable circuit breakers, fuses, and other protection devices.<\/p>\r\n      <\/div>\r\n    <\/details>\r\n\r\n    <details>\r\n      <summary>What should I confirm before buying an ATS?<\/summary>\r\n      <div class=\"ats-accordion-content\">\r\n        <p>Confirm voltage, current, pole number, and frequency.<\/p>\r\n        <p>Also check the source type, wiring method, transfer time, installation space, and certification needs.<\/p>\r\n      <\/div>\r\n    <\/details>\r\n\r\n  <\/div>\r\n\r\n  <div class=\"ats-cta-box\">\r\n    <h2><span class=\"ez-toc-section\" id=\"need-help-choosing-an-ats\"><\/span>Need Help Choosing an ATS?<span class=\"ez-toc-section-end\"><\/span><\/h2>\r\n    <p>Tell us your voltage, current, phase type, backup source, transfer requirement, and wiring details.<\/p>\r\n    <p>LEEYEE can help you select a suitable ATS-63 option.<\/p>\r\n    <p>Common uses include generator backup, solar inverter backup, distribution boards, and compact control cabinets.<\/p>\r\n    <div class=\"ats-cta-actions\">\r\n      <a class=\"ats-btn-white\" href=\"https:\/\/www.cnspd.com\/products\/leeyee-automatic-transfer-switch-solar-backup\/\" target=\"_blank\" rel=\"noopener\">View ATS-63 Product<\/a>\r\n      <a class=\"ats-btn-outline open-contact\" href=\"javascript:void(0);\">Request Selection Support<\/a>\r\n    <\/div>\r\n  <\/div>\r\n\r\n  <h2><span class=\"ez-toc-section\" id=\"conclusion\"><\/span>Conclusion<span class=\"ez-toc-section-end\"><\/span><\/h2>\r\n\r\n  <p>An automatic transfer switch moves a load between normal power and backup power.<\/p>\r\n  <p>It is widely used in generator backup, solar inverter backup, and home backup.<\/p>\r\n  <p>It can also be used in small commercial systems, telecom cabinets, control panels, and distribution boards.<\/p>\r\n  <p>Before choosing an ATS, confirm the voltage, current, phase type, and pole number.<\/p>\r\n  <p>Then check the backup source, wiring method, transfer time, and installation conditions.<\/p>\r\n  <p>For compact backup systems, LEEYEE ATS-63 provides 2P and 4P DIN-rail options from 6A to 63A.<\/p>\r\n  <p>Its transfer switching time is less than 50 ms.<\/p>\r\n  <p>A well-selected ATS makes backup power switching easier, safer, and more reliable.<\/p>\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>Jawaban Singkat Automatic transfer switch, atau ATS, mengalihkan beban antara dua sumber daya. Ketika daya utama gagal, ATS memindahkan beban ke daya cadangan. Sumber cadangan bisa berupa generator, inverter, sistem cadangan surya, atau sumber AC lainnya. Ketika daya utama kembali dan menjadi stabil, ATS beralih&#8230;<\/p>","protected":false},"author":18,"featured_media":29472,"comment_status":"closed","ping_status":"open","sticky":false,"template":"","format":"standard","meta":{"footnotes":""},"categories":[490,1,422],"tags":[],"class_list":["post-29476","post","type-post","status-publish","format-standard","has-post-thumbnail","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>What Is an Automatic Transfer Switch? How ATS Works &amp; How to Choose<\/title>\n<meta name=\"description\" content=\"A practical ATS guide for backup power systems. 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