{"id":31154,"date":"2026-09-17T09:53:57","date_gmt":"2026-09-17T01:53:57","guid":{"rendered":"https:\/\/www.cnspd.com\/?p=31154"},"modified":"2026-09-17T09:54:35","modified_gmt":"2026-09-17T01:54:35","slug":"automatic-transfer-switch-functions-what-buyers-should-check-before-ordering","status":"publish","type":"post","link":"https:\/\/www.cnspd.com\/de\/automatic-transfer-switch-functions\/","title":{"rendered":"Automatic Transfer Switch Functions: What Buyers Should Check Before Ordering"},"content":{"rendered":"\t\t<div data-elementor-type=\"wp-post\" data-elementor-id=\"31154\" class=\"elementor elementor-31154\" data-elementor-post-type=\"post\">\n\t\t\t\t<div class=\"elementor-element elementor-element-598ce93 e-flex e-con-boxed e-con e-parent\" data-id=\"598ce93\" 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-a6d9801 elementor-widget elementor-widget-html\" data-id=\"a6d9801\" data-element_type=\"widget\" data-e-type=\"widget\" data-widget_type=\"html.default\">\n\t\t\t\t<div class=\"elementor-widget-container\">\n\t\t\t\t\t<style>\r\n#leeyee-ats-functions-guide,\r\n#leeyee-ats-functions-guide * {\r\n  box-sizing: border-box;\r\n}\r\n\r\n#leeyee-ats-functions-guide {\r\n  --ly-blue: #004898;\r\n  --ly-blue-dark: #00376f;\r\n  --ly-blue-light: #eef5ff;\r\n  --ly-blue-pale: #f7fbff;\r\n  --ly-text: #273747;\r\n  --ly-heading: #15283a;\r\n  --ly-muted: #617181;\r\n  --ly-line: #dbe5ee;\r\n  --ly-warning: #8b5700;\r\n  --ly-warning-bg: #fff8eb;\r\n  --ly-warning-line: #eed39f;\r\n  --ly-success-bg: #f3faf7;\r\n  --ly-success-line: #cce7da;\r\n  width: 100%;\r\n  max-width: 860px;\r\n  margin: 0 auto;\r\n  padding: 8px 20px 56px;\r\n  color: var(--ly-text);\r\n  font-family: inherit;\r\n  font-size: 17px;\r\n  line-height: 1.72;\r\n  overflow-wrap: anywhere;\r\n}\r\n\r\n#leeyee-ats-functions-guide p {\r\n  margin: 0 0 1.15em;\r\n}\r\n\r\n#leeyee-ats-functions-guide a {\r\n  color: var(--ly-blue);\r\n  text-decoration-thickness: 1px;\r\n  text-underline-offset: 3px;\r\n}\r\n\r\n#leeyee-ats-functions-guide a:hover {\r\n  color: var(--ly-blue-dark);\r\n}\r\n\r\n#leeyee-ats-functions-guide h2,\r\n#leeyee-ats-functions-guide h3 {\r\n  color: var(--ly-heading);\r\n  line-height: 1.24;\r\n  text-wrap: balance;\r\n}\r\n\r\n#leeyee-ats-functions-guide h2 {\r\n  margin: 2.2em 0 .72em;\r\n  font-size: clamp(28px, 3.4vw, 34px);\r\n  font-weight: 760;\r\n  letter-spacing: -.02em;\r\n}\r\n\r\n#leeyee-ats-functions-guide h3 {\r\n  margin: 1.55em 0 .58em;\r\n  font-size: clamp(21px, 2.6vw, 25px);\r\n  font-weight: 730;\r\n}\r\n\r\n#leeyee-ats-functions-guide .ly-kicker {\r\n  margin: 0 0 12px;\r\n  color: var(--ly-blue);\r\n  font-size: 14px;\r\n  font-weight: 800;\r\n  letter-spacing: .08em;\r\n  text-transform: uppercase;\r\n}\r\n\r\n#leeyee-ats-functions-guide .ly-intro {\r\n  margin-bottom: 26px;\r\n  color: #314456;\r\n  font-size: 18px;\r\n  line-height: 1.68;\r\n}\r\n\r\n#leeyee-ats-functions-guide .ly-intro strong {\r\n  color: #1d354b;\r\n}\r\n\r\n#leeyee-ats-functions-guide .ly-quick {\r\n  margin: 28px 0 34px;\r\n  padding: 24px;\r\n  border: 1px solid #d6e7f7;\r\n  border-radius: 14px;\r\n  background: var(--ly-blue-pale);\r\n  box-shadow: 0 8px 24px rgba(0,72,152,.06);\r\n}\r\n\r\n#leeyee-ats-functions-guide .ly-quick h2 {\r\n  margin-top: 0;\r\n  font-size: clamp(25px, 3vw, 31px);\r\n}\r\n\r\n#leeyee-ats-functions-guide .ly-answer {\r\n  color: #21394f;\r\n  font-weight: 650;\r\n}\r\n\r\n#leeyee-ats-functions-guide .ly-key-grid {\r\n  display: grid;\r\n  grid-template-columns: repeat(2,minmax(0,1fr));\r\n  gap: 12px 18px;\r\n  margin: 18px 0 0;\r\n  padding: 0;\r\n  list-style: none;\r\n}\r\n\r\n#leeyee-ats-functions-guide .ly-key-grid li {\r\n  position: relative;\r\n  margin: 0;\r\n  padding-left: 24px;\r\n}\r\n\r\n#leeyee-ats-functions-guide .ly-key-grid li::before {\r\n  content: \"\u2713\";\r\n  position: absolute;\r\n  left: 0;\r\n  top: 0;\r\n  color: var(--ly-blue);\r\n  font-weight: 800;\r\n}\r\n\r\n#leeyee-ats-functions-guide .ly-figure {\r\n  margin: 30px 0 38px;\r\n}\r\n\r\n#leeyee-ats-functions-guide .ly-figure img {\r\n  display: block;\r\n  width: 100%;\r\n  height: auto;\r\n  border: 1px solid #dfe7ee;\r\n  border-radius: 12px;\r\n  background: #fff;\r\n}\r\n\r\n#leeyee-ats-functions-guide .ly-product-photo img {\r\n  max-width: 720px;\r\n  margin: 0 auto;\r\n}\r\n\r\n#leeyee-ats-functions-guide .ly-figure figcaption {\r\n  margin-top: 10px;\r\n  color: var(--ly-muted);\r\n  font-size: 14.5px;\r\n  line-height: 1.52;\r\n}\r\n\r\n#leeyee-ats-functions-guide .ly-callout,\r\n#leeyee-ats-functions-guide .ly-warning,\r\n#leeyee-ats-functions-guide .ly-checklist,\r\n#leeyee-ats-functions-guide .ly-cta,\r\n#leeyee-ats-functions-guide .ly-boundary {\r\n  margin: 24px 0 30px;\r\n  padding: 20px 22px;\r\n  border-radius: 12px;\r\n}\r\n\r\n#leeyee-ats-functions-guide .ly-callout,\r\n#leeyee-ats-functions-guide .ly-checklist,\r\n#leeyee-ats-functions-guide .ly-cta,\r\n#leeyee-ats-functions-guide .ly-boundary {\r\n  border: 1px solid #d9e8f7;\r\n  background: var(--ly-blue-pale);\r\n}\r\n\r\n#leeyee-ats-functions-guide .ly-warning {\r\n  border: 1px solid var(--ly-warning-line);\r\n  background: var(--ly-warning-bg);\r\n}\r\n\r\n#leeyee-ats-functions-guide .ly-title-small {\r\n  display: block;\r\n  margin-bottom: 8px;\r\n  color: var(--ly-blue);\r\n  font-size: 15px;\r\n  font-weight: 800;\r\n  letter-spacing: .03em;\r\n  text-transform: uppercase;\r\n}\r\n\r\n#leeyee-ats-functions-guide .ly-warning .ly-title-small {\r\n  color: var(--ly-warning);\r\n}\r\n\r\n#leeyee-ats-functions-guide .ly-table-note {\r\n  margin-bottom: 10px;\r\n  color: var(--ly-muted);\r\n  font-size: 14.5px;\r\n}\r\n\r\n#leeyee-ats-functions-guide .ly-table-wrap {\r\n  width: 100%;\r\n  margin: 18px 0 12px;\r\n}\r\n\r\n#leeyee-ats-functions-guide table {\r\n  width: 100%;\r\n  border: 1px solid var(--ly-line);\r\n  border-collapse: separate;\r\n  border-spacing: 0;\r\n  border-radius: 12px;\r\n  overflow: hidden;\r\n  background: #fff;\r\n  font-size: 15.5px;\r\n  line-height: 1.5;\r\n}\r\n\r\n#leeyee-ats-functions-guide thead th {\r\n  padding: 13px 14px;\r\n  background: var(--ly-blue);\r\n  color: #fff;\r\n  text-align: left;\r\n  vertical-align: top;\r\n  font-weight: 750;\r\n}\r\n\r\n#leeyee-ats-functions-guide tbody td {\r\n  padding: 13px 14px;\r\n  border-top: 1px solid var(--ly-line);\r\n  vertical-align: top;\r\n}\r\n\r\n#leeyee-ats-functions-guide tbody tr:first-child td {\r\n  border-top: 0;\r\n}\r\n\r\n#leeyee-ats-functions-guide tbody tr:nth-child(even) td {\r\n  background: #fbfdff;\r\n}\r\n\r\n#leeyee-ats-functions-guide .ly-table-conclusion {\r\n  margin: 10px 0 28px;\r\n  color: #294056;\r\n  font-weight: 650;\r\n}\r\n\r\n#leeyee-ats-functions-guide .ly-list {\r\n  margin: 12px 0 8px;\r\n  padding-left: 1.2em;\r\n}\r\n\r\n#leeyee-ats-functions-guide .ly-list li {\r\n  margin: 7px 0;\r\n}\r\n\r\n#leeyee-ats-functions-guide .ly-check-list {\r\n  margin: 12px 0 5px;\r\n  padding: 0;\r\n  list-style: none;\r\n}\r\n\r\n#leeyee-ats-functions-guide .ly-check-list li {\r\n  position: relative;\r\n  margin: 8px 0;\r\n  padding-left: 26px;\r\n}\r\n\r\n#leeyee-ats-functions-guide .ly-check-list li::before {\r\n  content: \"\u25a1\";\r\n  position: absolute;\r\n  left: 0;\r\n  color: var(--ly-blue);\r\n  font-weight: 800;\r\n}\r\n\r\n#leeyee-ats-functions-guide .ly-numbered {\r\n  margin: 18px 0 10px;\r\n  padding: 0;\r\n  list-style: none;\r\n  counter-reset: ly-step;\r\n}\r\n\r\n#leeyee-ats-functions-guide .ly-numbered li {\r\n  counter-increment: ly-step;\r\n  position: relative;\r\n  margin: 0 0 14px;\r\n  padding: 0 0 14px 44px;\r\n  border-bottom: 1px solid #e5edf3;\r\n}\r\n\r\n#leeyee-ats-functions-guide .ly-numbered li:last-child {\r\n  border-bottom: 0;\r\n}\r\n\r\n#leeyee-ats-functions-guide .ly-numbered li::before {\r\n  content: counter(ly-step);\r\n  position: absolute;\r\n  left: 0;\r\n  top: 0;\r\n  width: 30px;\r\n  height: 30px;\r\n  display: grid;\r\n  place-items: center;\r\n  border-radius: 50%;\r\n  background: var(--ly-blue);\r\n  color: #fff;\r\n  font-size: 14px;\r\n  font-weight: 800;\r\n}\r\n\r\n#leeyee-ats-functions-guide .ly-ref {\r\n  font-size: .78em;\r\n  vertical-align: super;\r\n  white-space: nowrap;\r\n}\r\n\r\n#leeyee-ats-functions-guide .ly-ref a {\r\n  text-decoration: none;\r\n  font-weight: 750;\r\n}\r\n\r\n#leeyee-ats-functions-guide .ly-inline-label {\r\n  display: inline-block;\r\n  margin-right: 5px;\r\n  padding: 2px 7px;\r\n  border-radius: 5px;\r\n  background: var(--ly-blue-light);\r\n  color: var(--ly-blue);\r\n  font-size: .86em;\r\n  font-weight: 750;\r\n}\r\n\r\n#leeyee-ats-functions-guide .ly-about-btn-light.leeyee-site-popup-btn {\r\n  appearance: none;\r\n  -webkit-appearance: none;\r\n  min-height: 50px;\r\n  margin: 0;\r\n  padding: 12px 22px;\r\n  border: 2px solid var(--ly-blue);\r\n  border-radius: 10px;\r\n  background: #fff;\r\n  color: var(--ly-blue);\r\n  box-shadow: 0 6px 16px rgba(0,72,152,.12);\r\n  font: inherit;\r\n  font-size: 15.5px;\r\n  font-weight: 750;\r\n  line-height: 1.2;\r\n  cursor: pointer;\r\n  transition:\r\n    background-color .18s ease,\r\n    color .18s ease,\r\n    border-color .18s ease,\r\n    transform .18s ease,\r\n    box-shadow .18s ease;\r\n}\r\n\r\n#leeyee-ats-functions-guide .ly-about-btn-light.leeyee-site-popup-btn:hover {\r\n  border-color: var(--ly-blue);\r\n  background: var(--ly-blue);\r\n  color: #fff;\r\n  transform: translateY(-1px);\r\n  box-shadow: 0 8px 20px rgba(0,72,152,.18);\r\n}\r\n\r\n#leeyee-ats-functions-guide .ly-about-btn-light.leeyee-site-popup-btn:focus-visible {\r\n  outline: 3px solid rgba(0,72,152,.25);\r\n  outline-offset: 3px;\r\n  border-color: var(--ly-blue);\r\n  background: var(--ly-blue);\r\n  color: #fff;\r\n}\r\n\r\n#leeyee-ats-functions-guide .ly-about-btn-light.leeyee-site-popup-btn:active {\r\n  transform: translateY(0);\r\n}\r\n\r\n#leeyee-ats-functions-guide .ly-faq {\r\n  margin-top: 18px;\r\n  border-top: 1px solid var(--ly-line);\r\n}\r\n\r\n#leeyee-ats-functions-guide .ly-faq details {\r\n  border-bottom: 1px solid var(--ly-line);\r\n}\r\n\r\n#leeyee-ats-functions-guide .ly-faq summary {\r\n  position: relative;\r\n  padding: 18px 38px 18px 0;\r\n  color: #1d3449;\r\n  font-weight: 720;\r\n  cursor: pointer;\r\n  list-style: none;\r\n}\r\n\r\n#leeyee-ats-functions-guide .ly-faq summary::-webkit-details-marker {\r\n  display: none;\r\n}\r\n\r\n#leeyee-ats-functions-guide .ly-faq summary::after {\r\n  content: \"+\";\r\n  position: absolute;\r\n  right: 4px;\r\n  top: 14px;\r\n  color: var(--ly-blue);\r\n  font-size: 26px;\r\n  font-weight: 500;\r\n}\r\n\r\n#leeyee-ats-functions-guide .ly-faq details[open] summary::after {\r\n  content: \"\u2013\";\r\n}\r\n\r\n#leeyee-ats-functions-guide .ly-faq-answer {\r\n  padding: 0 28px 18px 0;\r\n  color: #394d60;\r\n}\r\n\r\n#leeyee-ats-functions-guide .ly-related {\r\n  margin-top: 34px;\r\n  padding-top: 20px;\r\n  border-top: 1px solid var(--ly-line);\r\n}\r\n\r\n#leeyee-ats-functions-guide .ly-references {\r\n  margin-top: 18px;\r\n  padding-left: 1.35em;\r\n  color: #4e6071;\r\n  font-size: 14.5px;\r\n}\r\n\r\n#leeyee-ats-functions-guide .ly-references li {\r\n  margin-bottom: 12px;\r\n  padding-left: 4px;\r\n}\r\n\r\n#leeyee-ats-functions-guide .ly-references a {\r\n  word-break: break-word;\r\n}\r\n\r\n@media (max-width: 820px) {\r\n  #leeyee-ats-functions-guide {\r\n    padding: 6px 18px 48px;\r\n  }\r\n}\r\n\r\n@media (max-width: 768px) {\r\n  #leeyee-ats-functions-guide {\r\n    font-size: 16.5px;\r\n    line-height: 1.7;\r\n  }\r\n\r\n  #leeyee-ats-functions-guide .ly-intro {\r\n    font-size: 17px;\r\n  }\r\n\r\n  #leeyee-ats-functions-guide .ly-key-grid {\r\n    grid-template-columns: 1fr;\r\n    gap: 9px;\r\n  }\r\n\r\n  #leeyee-ats-functions-guide .ly-quick,\r\n  #leeyee-ats-functions-guide .ly-callout,\r\n  #leeyee-ats-functions-guide .ly-warning,\r\n  #leeyee-ats-functions-guide .ly-checklist,\r\n  #leeyee-ats-functions-guide .ly-cta,\r\n  #leeyee-ats-functions-guide .ly-boundary {\r\n    padding: 18px;\r\n  }\r\n}\r\n\r\n@media (max-width: 600px) {\r\n  #leeyee-ats-functions-guide {\r\n    padding-left: 14px;\r\n    padding-right: 14px;\r\n  }\r\n\r\n  #leeyee-ats-functions-guide h2 {\r\n    margin-top: 1.9em;\r\n  }\r\n\r\n  #leeyee-ats-functions-guide .ly-table-cards,\r\n  #leeyee-ats-functions-guide .ly-table-cards tbody,\r\n  #leeyee-ats-functions-guide .ly-table-cards tr,\r\n  #leeyee-ats-functions-guide .ly-table-cards td {\r\n    display: block;\r\n    width: 100%;\r\n  }\r\n\r\n  #leeyee-ats-functions-guide .ly-table-cards {\r\n    border: 0;\r\n    background: transparent;\r\n  }\r\n\r\n  #leeyee-ats-functions-guide .ly-table-cards thead {\r\n    display: none;\r\n  }\r\n\r\n  #leeyee-ats-functions-guide .ly-table-cards tr {\r\n    margin-bottom: 12px;\r\n    border: 1px solid var(--ly-line);\r\n    border-radius: 10px;\r\n    overflow: hidden;\r\n    background: #fff;\r\n  }\r\n\r\n  #leeyee-ats-functions-guide .ly-table-cards td,\r\n  #leeyee-ats-functions-guide .ly-table-cards tbody tr:nth-child(even) td {\r\n    display: grid;\r\n    grid-template-columns: minmax(105px,36%) 1fr;\r\n    gap: 12px;\r\n    padding: 11px 12px;\r\n    border-top: 1px solid var(--ly-line);\r\n    background: #fff;\r\n  }\r\n\r\n  #leeyee-ats-functions-guide .ly-table-cards td:first-child {\r\n    border-top: 0;\r\n  }\r\n\r\n  #leeyee-ats-functions-guide .ly-table-cards td::before {\r\n    content: attr(data-label);\r\n    color: var(--ly-blue);\r\n    font-size: 13px;\r\n    font-weight: 800;\r\n    line-height: 1.35;\r\n  }\r\n\r\n  #leeyee-ats-functions-guide .ly-about-btn-light.leeyee-site-popup-btn {\r\n    width: 100%;\r\n    min-height: 50px;\r\n    padding-left: 16px;\r\n    padding-right: 16px;\r\n  }\r\n}\r\n\r\n@media (max-width: 430px) {\r\n  #leeyee-ats-functions-guide {\r\n    padding-left: 12px;\r\n    padding-right: 12px;\r\n    font-size: 16px;\r\n  }\r\n\r\n  #leeyee-ats-functions-guide .ly-quick,\r\n  #leeyee-ats-functions-guide .ly-callout,\r\n  #leeyee-ats-functions-guide .ly-warning,\r\n  #leeyee-ats-functions-guide .ly-checklist,\r\n  #leeyee-ats-functions-guide .ly-cta,\r\n  #leeyee-ats-functions-guide .ly-boundary {\r\n    padding: 16px;\r\n    border-radius: 10px;\r\n  }\r\n}\r\n\r\n@media (max-width: 390px) {\r\n  #leeyee-ats-functions-guide .ly-table-cards td,\r\n  #leeyee-ats-functions-guide .ly-table-cards tbody tr:nth-child(even) td {\r\n    grid-template-columns: 1fr;\r\n    gap: 5px;\r\n  }\r\n}\r\n\r\n@media (max-width: 320px) {\r\n  #leeyee-ats-functions-guide {\r\n    padding-left: 10px;\r\n    padding-right: 10px;\r\n  }\r\n\r\n  #leeyee-ats-functions-guide .ly-about-btn-light.leeyee-site-popup-btn {\r\n    padding-left: 12px;\r\n    padding-right: 12px;\r\n    font-size: 15px;\r\n  }\r\n}\r\n<\/style>\r\n\r\n<article id=\"leeyee-ats-functions-guide\" aria-label=\"Automatic transfer switch functions and ATS-63 buyer guide\">\r\n\r\n  <p class=\"ly-kicker\">Compact DIN-rail ATS buyer guide<\/p>\r\n\r\n  <div class=\"ly-intro\">\r\n    <p>When buying a compact automatic transfer switch, checking only \u201c63A\u201d or \u201c2P \/ 4P\u201d is not enough. A B2B buyer should confirm <strong>what the ATS actually does, which two sources it transfers between, how automatic and manual operation work, whether the voltage and pole configuration match the system, and whether the short-circuit and installation conditions have been coordinated correctly<\/strong>.<\/p>\r\n\r\n    <p>This guide focuses on the functions and selection points that apply to the <strong>LEEYEE ATS-63 compact DIN-rail automatic transfer switch<\/strong>. It is intended for panel builders, electrical contractors, distributors, OEM buyers and project procurement teams evaluating this type of integrated ATS.<\/p>\r\n  <\/div>\r\n\r\n  <section class=\"ly-quick\" aria-labelledby=\"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\/de\/automatic-transfer-switch-functions\/#quick-answer-what-does-this-automatic-transfer-switch-do\" >Quick Answer: What Does This Automatic Transfer Switch Do?<\/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\/de\/automatic-transfer-switch-functions\/#1-the-core-function-transfer-between-power-a-and-power-b\" >1. The Core Function: Transfer Between Power A and Power B<\/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\/de\/automatic-transfer-switch-functions\/#2-what-happens-in-automatic-mode\" >2. What Happens in Automatic Mode?<\/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\/de\/automatic-transfer-switch-functions\/#3-why-manual-mode-still-matters\" >3. Why Manual Mode Still Matters<\/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\/de\/automatic-transfer-switch-functions\/#4-2p-vs-4p-choose-by-the-actual-wiring-system\" >4. 2P vs 4P: Choose by the Actual Wiring System<\/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\/de\/automatic-transfer-switch-functions\/#5-rated-current-6a-to-63a-is-a-series-range-not-one-universal-setting\" >5. Rated Current: 6A to 63A Is a Series Range, Not One Universal Setting<\/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\/de\/automatic-transfer-switch-functions\/#6-voltage-and-frequency-must-match-the-ordered-configuration\" >6. Voltage and Frequency Must Match the Ordered Configuration<\/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\/de\/automatic-transfer-switch-functions\/#7-transfer-switching-time-understand-what-%e2%80%9c\" >7. Transfer Switching Time: Understand What \u201c&lt;50 ms\u201d Means<\/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\/de\/automatic-transfer-switch-functions\/#8-class-pc-the-ats-is-not-the-short-circuit-protective-device\" >8. Class PC: The ATS Is Not the Short-Circuit Protective Device<\/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\/de\/automatic-transfer-switch-functions\/#9-what-do-pc-class-and-ac-31b-tell-a-buyer\" >9. What Do PC Class and AC-31B Tell a Buyer?<\/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\/de\/automatic-transfer-switch-functions\/#10-technical-specifications-buyers-should-check-before-ordering\" >10. Technical Specifications Buyers Should Check Before Ordering<\/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\/de\/automatic-transfer-switch-functions\/#11-panel-space-and-din-rail-installation\" >11. Panel Space and DIN-Rail Installation<\/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\/de\/automatic-transfer-switch-functions\/#12-where-this-compact-ats-is-a-good-fit\" >12. Where This Compact ATS 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-14\" href=\"#\" data-href=\"https:\/\/www.cnspd.com\/de\/automatic-transfer-switch-functions\/#13-when-this-ats-is-not-the-right-product\" >13. When This ATS Is Not the Right Product<\/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\/de\/automatic-transfer-switch-functions\/#14-common-purchasing-mistakes\" >14. Common Purchasing Mistakes<\/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\/de\/automatic-transfer-switch-functions\/#15-before-ordering-ats-63-buyer-checklist\" >15. Before Ordering: ATS-63 Buyer Checklist<\/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\/de\/automatic-transfer-switch-functions\/#frequently-asked-questions-about-automatic-transfer-switch-functions\" >Frequently Asked Questions About Automatic Transfer Switch Functions<\/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\/de\/automatic-transfer-switch-functions\/#references\" >References<\/a><\/li><\/ul><\/nav><\/div>\n<h2 id=\"ats-quick-answer\"><span class=\"ez-toc-section\" id=\"quick-answer-what-does-this-automatic-transfer-switch-do\"><\/span>Quick Answer: What Does This Automatic Transfer Switch Do?<span class=\"ez-toc-section-end\"><\/span><\/h2>\r\n\r\n    <p class=\"ly-answer\">LEEYEE ATS-63 is an integrated automatic transfer switch that transfers a load between <strong>common power A<\/strong> and <strong>backup power B<\/strong>. The switching device and basic automatic control function are built into the same compact DIN-rail unit.<span class=\"ly-ref\"><a href=\"#ref-1\">[1]<\/a><\/span><\/p>\r\n\r\n    <ul class=\"ly-key-grid\">\r\n      <li><strong>Two-source transfer:<\/strong> switches the load between power source A and power source B.<\/li>\r\n      <li><strong>Automatic \/ manual operation:<\/strong> supports automatic transfer and local manual operation.<\/li>\r\n      <li><strong>2P \/ 4P options:<\/strong> available for different wiring and pole requirements.<\/li>\r\n      <li><strong>6A\u201363A range:<\/strong> multiple rated-current options within the ATS-63 series.<\/li>\r\n      <li><strong>AC110V \/ 220V \/ 400V:<\/strong> available rated working-voltage options.<\/li>\r\n      <li><strong>DIN-rail mounting:<\/strong> compact construction for distribution boards and control cabinets.<\/li>\r\n    <\/ul>\r\n  <\/section>\r\n\r\n  <figure class=\"ly-figure ly-product-photo\">\r\n    <img\r\n      src=\"https:\/\/www.cnspd.com\/wp-content\/uploads\/2026\/06\/2-1.png\"\r\n      alt=\"LEEYEE ATS-2P63 compact DIN rail automatic transfer switch with source A, source B, load terminals and Auto Manual selector\"\r\n      loading=\"eager\"\r\n      decoding=\"async\"\r\n    >\r\n    <figcaption>LEEYEE ATS-2P63. The product combines the source-transfer mechanism, local Auto \/ Manual selection and status indication in one compact device rather than using a separate programmable ATS controller.<\/figcaption>\r\n  <\/figure>\r\n\r\n  <div class=\"ly-boundary\">\r\n    <span class=\"ly-title-small\">Important product scope<\/span>\r\n    <p>The supplied ATS-63 technical information does <strong>not<\/strong> list RS485 \/ Modbus, programmable communication I\/O, a dedicated generator-start controller output, closed-transition synchronization or a separate external ATS controller. These functions should therefore not be specified or promised for this product unless a separate model-specific document confirms them.<span class=\"ly-ref\"><a href=\"#ref-1\">[1]<\/a><\/span><\/p>\r\n  <\/div>\r\n\r\n  <h2><span class=\"ez-toc-section\" id=\"1-the-core-function-transfer-between-power-a-and-power-b\"><\/span>1. The Core Function: Transfer Between Power A and Power B<span class=\"ez-toc-section-end\"><\/span><\/h2>\r\n\r\n  <p>The main job of this ATS is straightforward: connect the load to one of two available AC sources and transfer between them according to the product's automatic-control logic.<\/p>\r\n\r\n  <p>The front of the 2P unit identifies <strong>A<\/strong> and <strong>B<\/strong> as the two source sides, with the load connection marked separately at the output. This makes the product suitable for compact backup-power arrangements where two AC sources need to feed one downstream load circuit.<span class=\"ly-ref\"><a href=\"#ref-1\">[1]<\/a><\/span><\/p>\r\n\r\n  <div class=\"ly-callout\">\r\n    <span class=\"ly-title-small\">Buyer meaning<\/span>\r\n    <p>This is an <strong>integrated compact ATS<\/strong>, not a stand-alone ATS controller. The buyer normally selects the complete device by voltage, current, pole configuration, source arrangement, wiring method and installation conditions.<\/p>\r\n  <\/div>\r\n\r\n  <h2><span class=\"ez-toc-section\" id=\"2-what-happens-in-automatic-mode\"><\/span>2. What Happens in Automatic Mode?<span class=\"ez-toc-section-end\"><\/span><\/h2>\r\n\r\n  <p>In automatic operation, the ATS monitors the source condition and performs source transfer according to its built-in control logic. The ATS-63 product data also specifies voltage-protection reference values for the AC220V and AC110V control configurations.<span class=\"ly-ref\"><a href=\"#ref-1\">[1]<\/a><\/span><\/p>\r\n\r\n  <p class=\"ly-table-note\">These are product-specific reference values from the current ATS-63 technical data, not universal ATS settings.<\/p>\r\n\r\n  <div class=\"ly-table-wrap\">\r\n    <table class=\"ly-table-cards\">\r\n      <thead>\r\n        <tr>\r\n          <th scope=\"col\">Control Configuration<\/th>\r\n          <th scope=\"col\">Voltage Reference<\/th>\r\n          <th scope=\"col\">Buyer Meaning<\/th>\r\n        <\/tr>\r\n      <\/thead>\r\n      <tbody>\r\n        <tr>\r\n          <td data-label=\"Configuration\"><strong>AC220V<\/strong><\/td>\r\n          <td data-label=\"Voltage Reference\">Undervoltage 175V; recovery 190V; overvoltage 270V; recovery 250V \u00b15V<\/td>\r\n          <td data-label=\"Buyer Meaning\">Confirm that the selected 220V configuration and system conditions match the project<\/td>\r\n        <\/tr>\r\n        <tr>\r\n          <td data-label=\"Configuration\"><strong>AC110V<\/strong><\/td>\r\n          <td data-label=\"Voltage Reference\">Undervoltage 85V; recovery 90V; overvoltage 140V; recovery 135V \u00b15V<\/td>\r\n          <td data-label=\"Buyer Meaning\">Do not reuse 220V assumptions for a 110V system<\/td>\r\n        <\/tr>\r\n      <\/tbody>\r\n    <\/table>\r\n  <\/div>\r\n\r\n  <div class=\"ly-warning\">\r\n    <span class=\"ly-title-small\">AC400V project note<\/span>\r\n    <p>The ATS-63 product range includes an AC400V rated-working-voltage option, while the current product page separately lists AC220V and AC110V control-circuit reference values. For an AC400V \/ 4P project, confirm the exact sensing and control wiring of the selected unit before order approval rather than inferring it from the 220V table.<span class=\"ly-ref\"><a href=\"#ref-1\">[1]<\/a><\/span><\/p>\r\n  <\/div>\r\n\r\n  <h2><span class=\"ez-toc-section\" id=\"3-why-manual-mode-still-matters\"><\/span>3. Why Manual Mode Still Matters<span class=\"ez-toc-section-end\"><\/span><\/h2>\r\n\r\n  <p>The product includes a local <strong>Auto \/ Manual<\/strong> selector. Manual operation is useful during commissioning, inspection or maintenance when the technician needs local control instead of normal automatic transfer.<\/p>\r\n\r\n  <p>For procurement, the important point is not simply that the word \u201cManual\u201d appears on the product. The project team should understand how manual operation is used in the actual panel and ensure that operating instructions are available to the installer or end user.<\/p>\r\n\r\n  <div class=\"ly-callout\">\r\n    <span class=\"ly-title-small\">Buyer check<\/span>\r\n    <p>If the project requires remote manual commands, programmable transfer delays, BMS control or remote communication, do not assume those functions are included. The current ATS-63 technical data confirms local Auto \/ Manual operation but does not list those advanced controller functions.<\/p>\r\n  <\/div>\r\n\r\n  <h2><span class=\"ez-toc-section\" id=\"4-2p-vs-4p-choose-by-the-actual-wiring-system\"><\/span>4. 2P vs 4P: Choose by the Actual Wiring System<span class=\"ez-toc-section-end\"><\/span><\/h2>\r\n\r\n  <p>ATS-63 is available in <strong>2P and 4P<\/strong> versions.<span class=\"ly-ref\"><a href=\"#ref-1\">[1]<\/a><\/span> Pole selection must follow the electrical system and neutral-switching requirement, not only the load current.<\/p>\r\n\r\n  <div class=\"ly-table-wrap\">\r\n    <table class=\"ly-table-cards\">\r\n      <thead>\r\n        <tr>\r\n          <th scope=\"col\">Option<\/th>\r\n          <th scope=\"col\">Typical Selection Direction<\/th>\r\n          <th scope=\"col\">What Must Be Confirmed<\/th>\r\n        <\/tr>\r\n      <\/thead>\r\n      <tbody>\r\n        <tr>\r\n          <td data-label=\"Option\"><strong>2P ATS<\/strong><\/td>\r\n          <td data-label=\"Typical Direction\">Commonly used where a single-phase system requires switching of line and neutral<\/td>\r\n          <td data-label=\"What to Confirm\">System wiring, neutral arrangement, rated voltage and load current<\/td>\r\n        <\/tr>\r\n        <tr>\r\n          <td data-label=\"Option\"><strong>4P ATS<\/strong><\/td>\r\n          <td data-label=\"Typical Direction\">Commonly used where three phases and neutral need to be switched<\/td>\r\n          <td data-label=\"What to Confirm\">Three-phase wiring, neutral requirements, system voltage and project design<\/td>\r\n        <\/tr>\r\n      <\/tbody>\r\n    <\/table>\r\n  <\/div>\r\n\r\n  <p class=\"ly-table-conclusion\">Do not select 2P or 4P from a generic rule alone. Neutral switching can depend on the earthing arrangement, source design and local electrical requirements.<\/p>\r\n\r\n  <h2><span class=\"ez-toc-section\" id=\"5-rated-current-6a-to-63a-is-a-series-range-not-one-universal-setting\"><\/span>5. Rated Current: 6A to 63A Is a Series Range, Not One Universal Setting<span class=\"ez-toc-section-end\"><\/span><\/h2>\r\n\r\n  <p>LEEYEE ATS-63 is available in rated operating current options of <strong>6A, 10A, 16A, 20A, 25A, 32A, 40A, 50A and 63A<\/strong>.<span class=\"ly-ref\"><a href=\"#ref-1\">[1]<\/a><\/span><\/p>\r\n\r\n  <p>The required rating should be selected from the actual circuit and load conditions. \u201c63A ATS\u201d should not become the default choice simply because it is the maximum rating in the series.<\/p>\r\n\r\n  <div class=\"ly-warning\">\r\n    <span class=\"ly-title-small\">Do not size by running current alone<\/span>\r\n    <p>Loads with significant starting or inrush current can impose different switching duties from ordinary steady loads. The ATS-63 technical data declares usage category <strong>AC-31B<\/strong>. If the project includes motors, pumps, compressors or other high-inrush loads, confirm whether the declared utilization category and switching duty are suitable before ordering.<\/p>\r\n  <\/div>\r\n\r\n  <h2><span class=\"ez-toc-section\" id=\"6-voltage-and-frequency-must-match-the-ordered-configuration\"><\/span>6. Voltage and Frequency Must Match the Ordered Configuration<span class=\"ez-toc-section-end\"><\/span><\/h2>\r\n\r\n  <p>The ATS-63 technical data lists rated working voltage options of <strong>AC110V, AC220V and AC400V<\/strong>, with a rated frequency of <strong>50\/60Hz<\/strong>.<span class=\"ly-ref\"><a href=\"#ref-1\">[1]<\/a><\/span><\/p>\r\n\r\n  <p>These values are model-selection data. They do not mean one physical ATS should automatically be assumed to work on every listed voltage without the correct configuration.<\/p>\r\n\r\n  <div class=\"ly-callout\">\r\n    <span class=\"ly-title-small\">For an RFQ<\/span>\r\n    <p>State the actual system voltage, frequency, phase arrangement and both source voltages. This is especially important when the normal source and backup source come from different equipment such as utility power and an inverter or generator.<\/p>\r\n  <\/div>\r\n\r\n  <h2><span class=\"ez-toc-section\" id=\"7-transfer-switching-time-understand-what-%e2%80%9c\"><\/span>7. Transfer Switching Time: Understand What \u201c&lt;50 ms\u201d Means<span class=\"ez-toc-section-end\"><\/span><\/h2>\r\n\r\n  <p>The current LEEYEE ATS-63 technical data specifies a <strong>transfer switching time of less than 50 ms<\/strong>.<span class=\"ly-ref\"><a href=\"#ref-1\">[1]<\/a><\/span><\/p>\r\n\r\n  <p>This value describes the ATS switching action. It does <strong>not<\/strong> mean every backup-power system restores power in less than 50 ms.<\/p>\r\n\r\n  <p>If the backup source is already energized and acceptable, the ATS can perform its switching operation according to the product design. If the backup source is a generator that is not already running, the generator itself still needs time to start and stabilize before it can supply the load.<\/p>\r\n\r\n  <div class=\"ly-warning\">\r\n    <span class=\"ly-title-small\">Not a zero-interruption device<\/span>\r\n    <p>Do not sell or specify this compact ATS as a UPS or closed-transition system. Applications that cannot tolerate an interruption require a different power architecture.<\/p>\r\n  <\/div>\r\n\r\n  <h2><span class=\"ez-toc-section\" id=\"8-class-pc-the-ats-is-not-the-short-circuit-protective-device\"><\/span>8. Class PC: The ATS Is Not the Short-Circuit Protective Device<span class=\"ez-toc-section-end\"><\/span><\/h2>\r\n\r\n  <p>The ATS-63 product specification declares the device as <strong>Class PC<\/strong>.<span class=\"ly-ref\"><a href=\"#ref-1\">[1]<\/a><\/span><\/p>\r\n\r\n  <p>Under IEC transfer-switch terminology, Class PC transfer switching equipment is capable of making and withstanding specified short-circuit current conditions but is <strong>not intended to break short-circuit current itself<\/strong>.<span class=\"ly-ref\"><a href=\"#ref-2\">[2]<\/a><\/span><span class=\"ly-ref\"><a href=\"#ref-3\">[3]<\/a><\/span><\/p>\r\n\r\n  <p>The ATS-63 technical data states a rated short-circuit current <strong>Iq of 5kA<\/strong> and lists <strong>RT16-00-63A<\/strong> as the recommended fuse.<span class=\"ly-ref\"><a href=\"#ref-1\">[1]<\/a><\/span><\/p>\r\n\r\n  <div class=\"ly-callout\">\r\n    <span class=\"ly-title-small\">Engineering meaning<\/span>\r\n    <p>The upstream protective device and available fault current must be considered as part of the complete design. Do not treat the ATS itself as a replacement for the required fuse, circuit breaker or short-circuit protection strategy.<\/p>\r\n  <\/div>\r\n\r\n  <h2><span class=\"ez-toc-section\" id=\"9-what-do-pc-class-and-ac-31b-tell-a-buyer\"><\/span>9. What Do PC Class and AC-31B Tell a Buyer?<span class=\"ez-toc-section-end\"><\/span><\/h2>\r\n\r\n  <p>These markings answer different questions.<\/p>\r\n\r\n  <div class=\"ly-table-wrap\">\r\n    <table class=\"ly-table-cards\">\r\n      <thead>\r\n        <tr>\r\n          <th scope=\"col\">Marking<\/th>\r\n          <th scope=\"col\">What It Describes<\/th>\r\n          <th scope=\"col\">Buyer Action<\/th>\r\n        <\/tr>\r\n      <\/thead>\r\n      <tbody>\r\n        <tr>\r\n          <td data-label=\"Marking\"><strong>Class PC<\/strong><\/td>\r\n          <td data-label=\"What It Describes\">Short-circuit capability classification of the transfer switching equipment<\/td>\r\n          <td data-label=\"Buyer Action\">Confirm upstream protection and short-circuit coordination<\/td>\r\n        <\/tr>\r\n        <tr>\r\n          <td data-label=\"Marking\"><strong>AC-31B<\/strong><\/td>\r\n          <td data-label=\"What It Describes\">Declared utilization category of the ATS-63 product<\/td>\r\n          <td data-label=\"Buyer Action\">Confirm the intended load and switching duty match the declared category<\/td>\r\n        <\/tr>\r\n      <\/tbody>\r\n    <\/table>\r\n  <\/div>\r\n\r\n  <p class=\"ly-table-conclusion\">Neither marking should be treated as a marketing label. Both affect whether the product is appropriate for the real circuit.<\/p>\r\n\r\n  <h2><span class=\"ez-toc-section\" id=\"10-technical-specifications-buyers-should-check-before-ordering\"><\/span>10. Technical Specifications Buyers Should Check Before Ordering<span class=\"ez-toc-section-end\"><\/span><\/h2>\r\n\r\n  <figure class=\"ly-figure\">\r\n    <img\r\n      src=\"https:\/\/www.cnspd.com\/wp-content\/uploads\/2026\/09\/1.5.png\"\r\n      alt=\"LEEYEE ATS-63 technical specifications including rated current voltage insulation voltage frequency PC class pole number short-circuit current fuse control circuit and service life\"\r\n      loading=\"lazy\"\r\n      decoding=\"async\"\r\n    >\r\n    <figcaption>LEEYEE ATS-63 technical specification summary. Use the product data as an RFQ confirmation sheet rather than selecting only from current and pole number.<\/figcaption>\r\n  <\/figure>\r\n\r\n  <p class=\"ly-table-note\">These are the principal values currently published for the ATS-63 series.<\/p>\r\n\r\n  <div class=\"ly-table-wrap\">\r\n    <table class=\"ly-table-cards\">\r\n      <thead>\r\n        <tr>\r\n          <th scope=\"col\">Specification<\/th>\r\n          <th scope=\"col\">ATS-63 Data<\/th>\r\n          <th scope=\"col\">Buyer Check<\/th>\r\n        <\/tr>\r\n      <\/thead>\r\n      <tbody>\r\n        <tr>\r\n          <td data-label=\"Specification\"><strong>Rated current Ie<\/strong><\/td>\r\n          <td data-label=\"ATS-63 Data\">6 \/ 10 \/ 16 \/ 20 \/ 25 \/ 32 \/ 40 \/ 50 \/ 63A<\/td>\r\n          <td data-label=\"Buyer Check\">Match the actual circuit and load duty<\/td>\r\n        <\/tr>\r\n        <tr>\r\n          <td data-label=\"Specification\"><strong>Rated working voltage Ue<\/strong><\/td>\r\n          <td data-label=\"ATS-63 Data\">AC110V \/ AC220V \/ AC400V<\/td>\r\n          <td data-label=\"Buyer Check\">Specify the required voltage configuration<\/td>\r\n        <\/tr>\r\n        <tr>\r\n          <td data-label=\"Specification\"><strong>Insulation voltage Ui<\/strong><\/td>\r\n          <td data-label=\"ATS-63 Data\">690V<\/td>\r\n          <td data-label=\"Buyer Check\">Verify against project insulation requirements<\/td>\r\n        <\/tr>\r\n        <tr>\r\n          <td data-label=\"Specification\"><strong>Impulse withstand Uimp<\/strong><\/td>\r\n          <td data-label=\"ATS-63 Data\">8kV<\/td>\r\n          <td data-label=\"Buyer Check\">Include in technical approval where required<\/td>\r\n        <\/tr>\r\n        <tr>\r\n          <td data-label=\"Specification\"><strong>Frequency<\/strong><\/td>\r\n          <td data-label=\"ATS-63 Data\">50\/60Hz<\/td>\r\n          <td data-label=\"Buyer Check\">Confirm both power sources<\/td>\r\n        <\/tr>\r\n        <tr>\r\n          <td data-label=\"Specification\"><strong>Class<\/strong><\/td>\r\n          <td data-label=\"ATS-63 Data\">PC<\/td>\r\n          <td data-label=\"Buyer Check\">Coordinate upstream short-circuit protection<\/td>\r\n        <\/tr>\r\n        <tr>\r\n          <td data-label=\"Specification\"><strong>Poles<\/strong><\/td>\r\n          <td data-label=\"ATS-63 Data\">2P \/ 4P<\/td>\r\n          <td data-label=\"Buyer Check\">Match phase and neutral switching requirements<\/td>\r\n        <\/tr>\r\n        <tr>\r\n          <td data-label=\"Specification\"><strong>Rated short-circuit current Iq<\/strong><\/td>\r\n          <td data-label=\"ATS-63 Data\">5kA<\/td>\r\n          <td data-label=\"Buyer Check\">Compare with the project fault-current conditions<\/td>\r\n        <\/tr>\r\n        <tr>\r\n          <td data-label=\"Specification\"><strong>Recommended fuse<\/strong><\/td>\r\n          <td data-label=\"ATS-63 Data\">RT16-00-63A<\/td>\r\n          <td data-label=\"Buyer Check\">Confirm final upstream protection and coordination<\/td>\r\n        <\/tr>\r\n        <tr>\r\n          <td data-label=\"Specification\"><strong>Mechanical life<\/strong><\/td>\r\n          <td data-label=\"ATS-63 Data\">\u22658000 operations<\/td>\r\n          <td data-label=\"Buyer Check\">Review expected switching frequency<\/td>\r\n        <\/tr>\r\n        <tr>\r\n          <td data-label=\"Specification\"><strong>Electrical life<\/strong><\/td>\r\n          <td data-label=\"ATS-63 Data\">\u22651500 operations<\/td>\r\n          <td data-label=\"Buyer Check\">Review switching duty and maintenance plan<\/td>\r\n        <\/tr>\r\n        <tr>\r\n          <td data-label=\"Specification\"><strong>Usage category<\/strong><\/td>\r\n          <td data-label=\"ATS-63 Data\">AC-31B<\/td>\r\n          <td data-label=\"Buyer Check\">Confirm suitability for the actual load<\/td>\r\n        <\/tr>\r\n      <\/tbody>\r\n    <\/table>\r\n  <\/div>\r\n\r\n  <h2><span class=\"ez-toc-section\" id=\"11-panel-space-and-din-rail-installation\"><\/span>11. Panel Space and DIN-Rail Installation<span class=\"ez-toc-section-end\"><\/span><\/h2>\r\n\r\n  <p>For panel builders and OEM buyers, mechanical fit is part of model selection. ATS-63 is designed for <strong>DIN-rail installation<\/strong>, but the 2P and 4P versions require different panel widths.<span class=\"ly-ref\"><a href=\"#ref-1\">[1]<\/a><\/span><\/p>\r\n\r\n  <figure class=\"ly-figure\">\r\n    <img\r\n      src=\"https:\/\/www.cnspd.com\/wp-content\/uploads\/2026\/06\/1.4.png\"\r\n      alt=\"LEEYEE ATS-63 2P and 4P automatic transfer switch dimensions terminal width screw torque wire strip length and DIN rail installation\"\r\n      loading=\"lazy\"\r\n      decoding=\"async\"\r\n    >\r\n    <figcaption>ATS-63 mechanical data: 2P overall size 108 \u00d7 50.5 \u00d7 78 mm; 4P overall size 108 \u00d7 82.5 \u00d7 78 mm; terminal width 7.4 mm; screw torque 2.5 Nm; recommended wire strip length 12 mm.<\/figcaption>\r\n  <\/figure>\r\n\r\n  <div class=\"ly-table-wrap\">\r\n    <table class=\"ly-table-cards\">\r\n      <thead>\r\n        <tr>\r\n          <th scope=\"col\">Installation Item<\/th>\r\n          <th scope=\"col\">Published Data<\/th>\r\n          <th scope=\"col\">Why It Matters<\/th>\r\n        <\/tr>\r\n      <\/thead>\r\n      <tbody>\r\n        <tr>\r\n          <td data-label=\"Installation Item\"><strong>2P overall size<\/strong><\/td>\r\n          <td data-label=\"Published Data\">108 \u00d7 50.5 \u00d7 78 mm<\/td>\r\n          <td data-label=\"Why It Matters\">Check available DIN-rail and wiring space<\/td>\r\n        <\/tr>\r\n        <tr>\r\n          <td data-label=\"Installation Item\"><strong>4P overall size<\/strong><\/td>\r\n          <td data-label=\"Published Data\">108 \u00d7 82.5 \u00d7 78 mm<\/td>\r\n          <td data-label=\"Why It Matters\">Requires more panel width than the 2P model<\/td>\r\n        <\/tr>\r\n        <tr>\r\n          <td data-label=\"Installation Item\"><strong>Terminal width<\/strong><\/td>\r\n          <td data-label=\"Published Data\">7.4 mm<\/td>\r\n          <td data-label=\"Why It Matters\">Affects conductor and terminal planning<\/td>\r\n        <\/tr>\r\n        <tr>\r\n          <td data-label=\"Installation Item\"><strong>Screw torque<\/strong><\/td>\r\n          <td data-label=\"Published Data\">2.5 Nm<\/td>\r\n          <td data-label=\"Why It Matters\">Use the specified installation torque<\/td>\r\n        <\/tr>\r\n        <tr>\r\n          <td data-label=\"Installation Item\"><strong>Wire strip length<\/strong><\/td>\r\n          <td data-label=\"Published Data\">12 mm<\/td>\r\n          <td data-label=\"Why It Matters\">Supports consistent terminal preparation<\/td>\r\n        <\/tr>\r\n      <\/tbody>\r\n    <\/table>\r\n  <\/div>\r\n\r\n  <h2><span class=\"ez-toc-section\" id=\"12-where-this-compact-ats-is-a-good-fit\"><\/span>12. Where This Compact ATS Is a Good Fit<span class=\"ez-toc-section-end\"><\/span><\/h2>\r\n\r\n  <p>The ATS-63 is intended for compact backup-power arrangements that need automatic source transfer within its published electrical and environmental limits.<span class=\"ly-ref\"><a href=\"#ref-1\">[1]<\/a><\/span><\/p>\r\n\r\n  <ul class=\"ly-list\">\r\n    <li><strong>Distribution boards:<\/strong> compact circuits requiring transfer between two AC sources.<\/li>\r\n    <li><strong>Control cabinets:<\/strong> auxiliary or small-power circuits where DIN-rail space matters.<\/li>\r\n    <li><strong>Generator backup systems:<\/strong> when the generator-side source and system architecture are compatible with the ATS.<\/li>\r\n    <li><strong>Inverter backup systems:<\/strong> when output voltage, frequency, waveform, neutral arrangement and wiring meet the product requirements.<\/li>\r\n    <li><strong>Light commercial backup:<\/strong> circuits within the ATS-63 current, voltage and switching-duty limits.<\/li>\r\n    <li><strong>OEM panels:<\/strong> where a repeatable 2P or 4P DIN-rail transfer solution is required.<\/li>\r\n  <\/ul>\r\n\r\n  <h2><span class=\"ez-toc-section\" id=\"13-when-this-ats-is-not-the-right-product\"><\/span>13. When This ATS Is Not the Right Product<span class=\"ez-toc-section-end\"><\/span><\/h2>\r\n\r\n  <p>A technically correct product page should also tell buyers when another solution is required.<\/p>\r\n\r\n  <div class=\"ly-warning\">\r\n    <span class=\"ly-title-small\">Use another solution when the project requires<\/span>\r\n    <ul class=\"ly-list\">\r\n      <li>Rated current above 63A.<\/li>\r\n      <li>Closed-transition or make-before-break transfer.<\/li>\r\n      <li>Zero-interruption power comparable with a UPS.<\/li>\r\n      <li>Integrated generator engine-start management that is not documented for this ATS.<\/li>\r\n      <li>RS485 \/ Modbus, BMS integration or programmable communication I\/O not listed in the product documentation.<\/li>\r\n      <li>A different utilization category or switching duty required by the actual load.<\/li>\r\n      <li>Short-circuit conditions that cannot be coordinated with the published ATS-63 ratings and upstream protection.<\/li>\r\n    <\/ul>\r\n  <\/div>\r\n\r\n  <h2><span class=\"ez-toc-section\" id=\"14-common-purchasing-mistakes\"><\/span>14. Common Purchasing Mistakes<span class=\"ez-toc-section-end\"><\/span><\/h2>\r\n\r\n  <ol class=\"ly-numbered\">\r\n    <li><strong>Ordering \u201c63A ATS\u201d without giving the voltage or pole number.<\/strong> Current alone does not identify the correct configuration.<\/li>\r\n    <li><strong>Assuming 2P and 4P differ only in physical width.<\/strong> Pole configuration must match the electrical system and neutral-switching requirement.<\/li>\r\n    <li><strong>Assuming all listed voltages are one universal model.<\/strong> Specify the actual required voltage configuration.<\/li>\r\n    <li><strong>Treating Class PC as built-in short-circuit protection.<\/strong> The upstream protection and fault-current conditions still require engineering coordination.<\/li>\r\n    <li><strong>Ignoring AC-31B when the load has significant inrush.<\/strong> Confirm the utilization category against the real switching duty.<\/li>\r\n    <li><strong>Assuming &lt;50 ms means zero interruption.<\/strong> ATS switching time and total backup-source recovery time are different.<\/li>\r\n    <li><strong>Requesting Modbus, dry contacts or generator-start control without checking the model documentation.<\/strong> These functions are not listed in the current ATS-63 technical data.<\/li>\r\n    <li><strong>Ignoring panel dimensions.<\/strong> The 4P model is wider than the 2P model and requires different cabinet space.<\/li>\r\n  <\/ol>\r\n\r\n  <h2><span class=\"ez-toc-section\" id=\"15-before-ordering-ats-63-buyer-checklist\"><\/span>15. Before Ordering: ATS-63 Buyer Checklist<span class=\"ez-toc-section-end\"><\/span><\/h2>\r\n\r\n  <div class=\"ly-checklist\">\r\n    <span class=\"ly-title-small\">Send these parameters with your RFQ<\/span>\r\n\r\n    <ul class=\"ly-check-list\">\r\n      <li>Required rated current: 6A to 63A<\/li>\r\n      <li>System voltage: AC110V, AC220V or AC400V<\/li>\r\n      <li>Frequency: 50Hz or 60Hz<\/li>\r\n      <li>Single-phase or three-phase system<\/li>\r\n      <li>Required pole configuration: 2P or 4P<\/li>\r\n      <li>Normal source type and voltage<\/li>\r\n      <li>Backup source type and voltage<\/li>\r\n      <li>Whether neutral must be switched<\/li>\r\n      <li>Load type and any significant starting or inrush current<\/li>\r\n      <li>Available short-circuit current and upstream protective device<\/li>\r\n      <li>Required transfer-time expectations<\/li>\r\n      <li>Available DIN-rail and cabinet space<\/li>\r\n      <li>Installation environment and project requirements<\/li>\r\n      <li>Quantity, labeling or OEM documentation requirements<\/li>\r\n    <\/ul>\r\n  <\/div>\r\n\r\n  <div class=\"ly-cta\">\r\n    <span class=\"ly-title-small\">Need help confirming an ATS-63 configuration?<\/span>\r\n\r\n    <p>Send your voltage, current, phase type, 2P \/ 4P requirement, normal source, backup source, load type and panel-space information. LEEYEE can use those details to confirm which ATS-63 configuration should be reviewed for your project.<\/p>\r\n\r\n    <button\r\n      type=\"button\"\r\n      class=\"ly-about-btn-light leeyee-site-popup-btn\"\r\n      aria-label=\"Request ATS-63 Selection Review\"\r\n    >\r\n      <span class=\"w-btn-label\">Request ATS-63 Selection Review<\/span>\r\n    <\/button>\r\n  <\/div>\r\n\r\n  <h2><span class=\"ez-toc-section\" id=\"frequently-asked-questions-about-automatic-transfer-switch-functions\"><\/span>Frequently Asked Questions About Automatic Transfer Switch Functions<span class=\"ez-toc-section-end\"><\/span><\/h2>\r\n\r\n  <div class=\"ly-faq\">\r\n\r\n    <details>\r\n      <summary>What is the main function of the LEEYEE ATS-63?<\/summary>\r\n      <div class=\"ly-faq-answer\">\r\n        <p>ATS-63 transfers a load between common power A and backup power B. The product integrates the transfer mechanism and basic automatic-control function into a compact DIN-rail unit.<span class=\"ly-ref\"><a href=\"#ref-1\">[1]<\/a><\/span><\/p>\r\n      <\/div>\r\n    <\/details>\r\n\r\n    <details>\r\n      <summary>Does the ATS-63 support automatic and manual operation?<\/summary>\r\n      <div class=\"ly-faq-answer\">\r\n        <p>Yes. The product has Auto \/ Manual operation. Manual mode is useful for local commissioning and maintenance, while automatic mode performs normal source-transfer operation.<\/p>\r\n      <\/div>\r\n    <\/details>\r\n\r\n    <details>\r\n      <summary>What current ratings are available?<\/summary>\r\n      <div class=\"ly-faq-answer\">\r\n        <p>The published ATS-63 series includes 6A, 10A, 16A, 20A, 25A, 32A, 40A, 50A and 63A options. Select the rating from the actual load and switching-duty requirements rather than automatically choosing the highest value.<span class=\"ly-ref\"><a href=\"#ref-1\">[1]<\/a><\/span><\/p>\r\n      <\/div>\r\n    <\/details>\r\n\r\n    <details>\r\n      <summary>What is the difference between the 2P and 4P ATS-63?<\/summary>\r\n      <div class=\"ly-faq-answer\">\r\n        <p>The two versions have different pole configurations and physical widths. A 2P unit is commonly used where a single-phase circuit switches line and neutral, while a 4P unit is commonly used where three phases and neutral must be switched. Final selection must follow the actual wiring and earthing arrangement.<\/p>\r\n      <\/div>\r\n    <\/details>\r\n\r\n    <details>\r\n      <summary>Does ATS-63 provide overload or short-circuit protection?<\/summary>\r\n      <div class=\"ly-faq-answer\">\r\n        <p>Do not treat it as the circuit's overcurrent protective device. ATS-63 is declared as Class PC, and its technical data states Iq 5kA together with a recommended RT16-00-63A fuse. Upstream short-circuit and overcurrent protection must be coordinated with the project.<span class=\"ly-ref\"><a href=\"#ref-1\">[1]<\/a><\/span><span class=\"ly-ref\"><a href=\"#ref-3\">[3]<\/a><\/span><\/p>\r\n      <\/div>\r\n    <\/details>\r\n\r\n    <details>\r\n      <summary>Does the ATS-63 have RS485 or Modbus?<\/summary>\r\n      <div class=\"ly-faq-answer\">\r\n        <p>The current ATS-63 technical information used for this guide does not list RS485, Modbus or BMS communication. Do not assume those functions are available unless a model-specific document confirms them.<\/p>\r\n      <\/div>\r\n    <\/details>\r\n\r\n    <details>\r\n      <summary>Can the ATS-63 start a generator automatically?<\/summary>\r\n      <div class=\"ly-faq-answer\">\r\n        <p>The current product documentation confirms automatic transfer between two AC sources but does not list a dedicated programmable generator-start controller output. If the project requires the ATS to issue a generator engine-start command, confirm the complete generator-control architecture before specifying this product.<\/p>\r\n      <\/div>\r\n    <\/details>\r\n\r\n    <details>\r\n      <summary>Is the ATS-63 a zero-interruption transfer switch?<\/summary>\r\n      <div class=\"ly-faq-answer\">\r\n        <p>No such assumption should be made. The published ATS switching time is less than 50 ms, which is not the same as zero interruption. A UPS or another engineered power design may be required for loads that cannot tolerate a supply break.<span class=\"ly-ref\"><a href=\"#ref-1\">[1]<\/a><\/span><\/p>\r\n      <\/div>\r\n    <\/details>\r\n\r\n    <details>\r\n      <summary>What information should I send before ordering?<\/summary>\r\n      <div class=\"ly-faq-answer\">\r\n        <p>Send the rated current, voltage, frequency, phase type, 2P \/ 4P requirement, normal and backup source details, load type, wiring arrangement, protective-device information and available panel space. This allows the proposed ATS configuration to be checked against the real project.<\/p>\r\n      <\/div>\r\n    <\/details>\r\n\r\n  <\/div>\r\n\r\n  <div class=\"ly-boundary\">\r\n    <span class=\"ly-title-small\">Final engineering note<\/span>\r\n\r\n    <p>The values in this guide describe the currently published LEEYEE ATS-63 series. Final selection still depends on the specific electrical system, wiring arrangement, load duty, fault-current conditions, upstream protection and local project requirements. Where a condition is not covered by the model documentation, obtain project-specific confirmation before approval.<\/p>\r\n  <\/div>\r\n\r\n  <div class=\"ly-related\">\r\n    <p><strong>Continue the selection process:<\/strong> view the <a href=\"https:\/\/www.cnspd.com\/products\/leeyee-automatic-transfer-switch-solar-backup\/\">LEEYEE ATS-63 product page<\/a> for current product data and wiring information. For a broader explanation of ATS principles and general selection logic, see <a href=\"https:\/\/www.cnspd.com\/what-is-an-automatic-transfer-switch-how-ats-works-how-to-choose\/\">What Is an Automatic Transfer Switch? How ATS Works &amp; How to Choose<\/a>.<\/p>\r\n  <\/div>\r\n\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 class=\"ly-references\">\r\n    <li id=\"ref-1\">\r\n      <strong>LEEYEE.<\/strong>\r\n      <em>ATS-63 Automatic Transfer Switch \u2014 Product Data and Technical Parameters.<\/em>\r\n      Rated current, voltage, frequency, 2P \/ 4P options, transfer switching time, Class PC, Iq, recommended fuse, AC-31B, environmental data and dimensions.\r\n      <a href=\"https:\/\/www.cnspd.com\/products\/leeyee-automatic-transfer-switch-solar-backup\/\" target=\"_blank\" rel=\"noopener noreferrer\">Official LEEYEE product page<\/a>.\r\n    <\/li>\r\n\r\n    <li id=\"ref-2\">\r\n      <strong>IEC.<\/strong>\r\n      <em>IEC 60947-6-1:2026 \u2014 Low-voltage switchgear and controlgear \u2014 Part 6-1: Multiple function equipment \u2014 Transfer switching equipment.<\/em>\r\n      IEC states that the standard applies to transfer switching equipment used to transfer a load between power supply sources.\r\n      <a href=\"https:\/\/webstore.iec.ch\/en\/publication\/90494\" target=\"_blank\" rel=\"noopener noreferrer\">Official IEC publication page<\/a>.\r\n    <\/li>\r\n\r\n    <li id=\"ref-3\">\r\n      <strong>ABB.<\/strong>\r\n      <em>How to Select an Automatic Transfer Switch Class.<\/em>\r\n      Technical guidance explaining IEC 60947-6-1 Class PC transfer switching equipment as capable of making and withstanding, but not intended for breaking, short-circuit currents.\r\n      <a href=\"https:\/\/library.e.abb.com\/public\/a0a6a4a06b204e7bbf5988e6d35ee364\/ATS%20white%20paper_1SCC303022C0201_20-09.pdf\" target=\"_blank\" rel=\"noopener noreferrer\">Official ABB technical paper<\/a>.\r\n    <\/li>\r\n  <\/ol>\r\n\r\n  <script>\r\n  document.addEventListener('DOMContentLoaded', function () {\r\n    var aboutPopupButtons = document.querySelectorAll('.leeyee-site-popup-btn');\r\n\r\n    aboutPopupButtons.forEach(function (button) {\r\n      button.addEventListener('click', function () {\r\n        var realPopupTrigger = document.querySelector(\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>\r\n\r\n<\/article>\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>Compact DIN-rail ATS buyer guide When buying a compact automatic transfer switch, checking only \u201c63A\u201d or \u201c2P \/ 4P\u201d is not enough. A B2B buyer should confirm what the ATS actually does, which two sources it transfers between, how automatic and manual operation work, whether the voltage and pole configuration match the system, and whether&#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-31154","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>Automatic Transfer Switch Functions &amp; Buyer Guide | LEEYEE<\/title>\n<meta name=\"description\" content=\"Learn the key automatic transfer switch functions and selection points for LEEYEE ATS-63, including Auto\/Manual transfer, 2P vs 4P, 6A\u201363A ratings, voltage, Class PC, AC-31B, short-circuit coordination and DIN-rail installation.\" \/>\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\/de\/automatic-transfer-switch-functions\/\" \/>\n<meta property=\"og:locale\" content=\"de_DE\" \/>\n<meta property=\"og:type\" content=\"article\" \/>\n<meta property=\"og:title\" content=\"Automatic Transfer Switch Functions &amp; Buyer Guide | LEEYEE\" \/>\n<meta property=\"og:description\" content=\"Learn the key automatic transfer switch functions and selection points for LEEYEE ATS-63, including Auto\/Manual transfer, 2P vs 4P, 6A\u201363A ratings, voltage, Class PC, AC-31B, short-circuit coordination and DIN-rail installation.\" \/>\n<meta property=\"og:url\" content=\"https:\/\/www.cnspd.com\/de\/automatic-transfer-switch-functions\/\" \/>\n<meta property=\"og:site_name\" content=\"Surge Protector, Surge Arrestor, Isolating Switch - 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