{"id":31658,"date":"2026-10-14T09:21:07","date_gmt":"2026-10-14T01:21:07","guid":{"rendered":"https:\/\/www.cnspd.com\/?p=31658"},"modified":"2026-10-14T09:21:34","modified_gmt":"2026-10-14T01:21:34","slug":"standby-generator-ats-selection-guide-current-poles-start-signal-delays","status":"publish","type":"post","link":"https:\/\/www.cnspd.com\/it\/standby-generator-ats-selection-guide\/","title":{"rendered":"Standby Generator ATS Selection Guide: Current, Poles, Start Signal &#038; Delays"},"content":{"rendered":"\t\t<div data-elementor-type=\"wp-post\" data-elementor-id=\"31658\" class=\"elementor elementor-31658\" data-elementor-post-type=\"post\">\n\t\t\t\t<div class=\"elementor-element elementor-element-3cdbbcb e-flex e-con-boxed e-con e-parent\" data-id=\"3cdbbcb\" 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-0c0e92c elementor-widget elementor-widget-html\" data-id=\"0c0e92c\" 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-standby-generator-ats-guide {\r\n  --ly-blue: #004898;\r\n  --ly-blue-dark: #00386f;\r\n  --ly-blue-soft: #eef5ff;\r\n  --ly-blue-soft-2: #f7fbff;\r\n  --ly-text: #263442;\r\n  --ly-heading: #172432;\r\n  --ly-muted: #617181;\r\n  --ly-line: #dbe4ec;\r\n  --ly-warning-bg: #fff8e7;\r\n  --ly-warning-border: #d89b20;\r\n  --ly-warning-text: #694b0e;\r\n  max-width: 860px;\r\n  margin: 0 auto;\r\n  padding: 8px 20px 48px;\r\n  color: var(--ly-text);\r\n  font-family: inherit;\r\n  font-size: 17px;\r\n  line-height: 1.72;\r\n  box-sizing: border-box;\r\n}\r\n\r\n#leeyee-standby-generator-ats-guide *,\r\n#leeyee-standby-generator-ats-guide *::before,\r\n#leeyee-standby-generator-ats-guide *::after {\r\n  box-sizing: border-box;\r\n}\r\n\r\n#leeyee-standby-generator-ats-guide p {\r\n  margin: 0 0 18px;\r\n}\r\n\r\n#leeyee-standby-generator-ats-guide strong {\r\n  color: var(--ly-heading);\r\n  font-weight: 700;\r\n}\r\n\r\n#leeyee-standby-generator-ats-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-standby-generator-ats-guide a:hover {\r\n  color: var(--ly-blue-dark);\r\n}\r\n\r\n#leeyee-standby-generator-ats-guide h2 {\r\n  margin: 52px 0 18px;\r\n  color: var(--ly-heading);\r\n  font-size: clamp(27px, 3vw, 32px);\r\n  line-height: 1.24;\r\n  font-weight: 750;\r\n  letter-spacing: -0.02em;\r\n}\r\n\r\n#leeyee-standby-generator-ats-guide h3 {\r\n  margin: 32px 0 12px;\r\n  color: var(--ly-heading);\r\n  font-size: clamp(21px, 2.4vw, 24px);\r\n  line-height: 1.32;\r\n  font-weight: 730;\r\n}\r\n\r\n#leeyee-standby-generator-ats-guide .leeyee-p68-intro {\r\n  margin: 4px 0 24px;\r\n  color: #344657;\r\n  font-size: 18px;\r\n  line-height: 1.7;\r\n}\r\n\r\n#leeyee-standby-generator-ats-guide .leeyee-p68-quick {\r\n  margin: 28px 0 34px;\r\n  padding: 24px 26px;\r\n  background: var(--ly-blue-soft-2);\r\n  border: 1px solid #cfe0ef;\r\n  border-left: 4px solid var(--ly-blue);\r\n  border-radius: 10px;\r\n}\r\n\r\n#leeyee-standby-generator-ats-guide .leeyee-p68-quick h2 {\r\n  margin: 0 0 12px;\r\n  font-size: 25px;\r\n}\r\n\r\n#leeyee-standby-generator-ats-guide .leeyee-p68-keyline {\r\n  margin: 20px 0 0;\r\n  padding: 13px 16px;\r\n  background: #fff;\r\n  border: 1px solid #d6e3ee;\r\n  border-radius: 8px;\r\n  color: var(--ly-heading);\r\n  font-weight: 700;\r\n}\r\n\r\n#leeyee-standby-generator-ats-guide .leeyee-p68-table-wrap {\r\n  width: 100%;\r\n  margin: 22px 0 14px;\r\n}\r\n\r\n#leeyee-standby-generator-ats-guide table {\r\n  width: 100%;\r\n  border-collapse: separate;\r\n  border-spacing: 0;\r\n  table-layout: fixed;\r\n  overflow: hidden;\r\n  background: #fff;\r\n  border: 1px solid var(--ly-line);\r\n  border-radius: 10px;\r\n  font-size: 15.5px;\r\n  line-height: 1.5;\r\n}\r\n\r\n#leeyee-standby-generator-ats-guide th,\r\n#leeyee-standby-generator-ats-guide td {\r\n  padding: 13px 14px;\r\n  text-align: left;\r\n  vertical-align: top;\r\n  border-right: 1px solid var(--ly-line);\r\n  border-bottom: 1px solid var(--ly-line);\r\n  overflow-wrap: anywhere;\r\n}\r\n\r\n#leeyee-standby-generator-ats-guide th:last-child,\r\n#leeyee-standby-generator-ats-guide td:last-child {\r\n  border-right: 0;\r\n}\r\n\r\n#leeyee-standby-generator-ats-guide tr:last-child td {\r\n  border-bottom: 0;\r\n}\r\n\r\n#leeyee-standby-generator-ats-guide thead th {\r\n  background: var(--ly-blue);\r\n  color: #fff;\r\n  font-weight: 700;\r\n}\r\n\r\n#leeyee-standby-generator-ats-guide tbody tr:nth-child(even) {\r\n  background: #fbfdff;\r\n}\r\n\r\n#leeyee-standby-generator-ats-guide .leeyee-p68-table-note {\r\n  margin: 10px 2px 0;\r\n  color: var(--ly-muted);\r\n  font-size: 14.5px;\r\n}\r\n\r\n#leeyee-standby-generator-ats-guide figure {\r\n  margin: 30px 0 34px;\r\n}\r\n\r\n#leeyee-standby-generator-ats-guide figure img {\r\n  display: block;\r\n  width: 100%;\r\n  max-width: 100%;\r\n  height: auto;\r\n  margin: 0 auto;\r\n  background: #fff;\r\n  border: 1px solid #e0e7ed;\r\n  border-radius: 10px;\r\n}\r\n\r\n#leeyee-standby-generator-ats-guide .leeyee-p68-product-figure img {\r\n  max-width: 640px;\r\n}\r\n\r\n#leeyee-standby-generator-ats-guide figcaption {\r\n  max-width: 780px;\r\n  margin: 10px auto 0;\r\n  color: var(--ly-muted);\r\n  font-size: 14px;\r\n  line-height: 1.55;\r\n  text-align: center;\r\n}\r\n\r\n#leeyee-standby-generator-ats-guide .leeyee-p68-warning {\r\n  margin: 26px 0;\r\n  padding: 19px 21px;\r\n  background: var(--ly-warning-bg);\r\n  border-left: 4px solid var(--ly-warning-border);\r\n  border-radius: 8px;\r\n  color: var(--ly-warning-text);\r\n}\r\n\r\n#leeyee-standby-generator-ats-guide .leeyee-p68-warning strong {\r\n  color: #59400e;\r\n}\r\n\r\n#leeyee-standby-generator-ats-guide .leeyee-p68-note {\r\n  margin: 24px 0;\r\n  padding: 18px 20px;\r\n  background: var(--ly-blue-soft);\r\n  border: 1px solid #cfdfef;\r\n  border-radius: 8px;\r\n}\r\n\r\n#leeyee-standby-generator-ats-guide .leeyee-p68-note p:last-child,\r\n#leeyee-standby-generator-ats-guide .leeyee-p68-warning p:last-child {\r\n  margin-bottom: 0;\r\n}\r\n\r\n#leeyee-standby-generator-ats-guide .leeyee-p68-meaning {\r\n  margin: 15px 0 20px;\r\n  padding-left: 16px;\r\n  border-left: 3px solid #8db4d4;\r\n  color: #42566a;\r\n}\r\n\r\n#leeyee-standby-generator-ats-guide .leeyee-p68-meaning strong {\r\n  color: var(--ly-blue);\r\n}\r\n\r\n#leeyee-standby-generator-ats-guide ul,\r\n#leeyee-standby-generator-ats-guide ol {\r\n  margin: 14px 0 22px;\r\n  padding-left: 23px;\r\n}\r\n\r\n#leeyee-standby-generator-ats-guide li {\r\n  margin: 8px 0;\r\n}\r\n\r\n#leeyee-standby-generator-ats-guide .leeyee-p68-steps {\r\n  margin: 24px 0;\r\n  padding: 0;\r\n  list-style: none;\r\n  counter-reset: leeyee-p68-step;\r\n}\r\n\r\n#leeyee-standby-generator-ats-guide .leeyee-p68-steps li {\r\n  position: relative;\r\n  margin: 0 0 14px;\r\n  padding: 16px 18px 16px 54px;\r\n  background: #fff;\r\n  border: 1px solid var(--ly-line);\r\n  border-radius: 9px;\r\n}\r\n\r\n#leeyee-standby-generator-ats-guide .leeyee-p68-steps li::before {\r\n  counter-increment: leeyee-p68-step;\r\n  content: counter(leeyee-p68-step);\r\n  position: absolute;\r\n  top: 15px;\r\n  left: 16px;\r\n  width: 26px;\r\n  height: 26px;\r\n  display: grid;\r\n  place-items: center;\r\n  background: var(--ly-blue);\r\n  border-radius: 50%;\r\n  color: #fff;\r\n  font-size: 13px;\r\n  font-weight: 700;\r\n}\r\n\r\n#leeyee-standby-generator-ats-guide .leeyee-p68-checklist {\r\n  margin: 26px 0 30px;\r\n  padding: 24px;\r\n  background: var(--ly-blue-soft-2);\r\n  border: 1px solid #d3e2ef;\r\n  border-radius: 10px;\r\n}\r\n\r\n#leeyee-standby-generator-ats-guide .leeyee-p68-checklist h3 {\r\n  margin-top: 0;\r\n}\r\n\r\n#leeyee-standby-generator-ats-guide .leeyee-p68-checklist ul {\r\n  margin-bottom: 0;\r\n}\r\n\r\n#leeyee-standby-generator-ats-guide .leeyee-p68-related {\r\n  margin: 28px 0;\r\n  padding: 20px 22px;\r\n  background: #fff;\r\n  border: 1px solid var(--ly-line);\r\n  border-radius: 9px;\r\n}\r\n\r\n#leeyee-standby-generator-ats-guide .leeyee-p68-related h3 {\r\n  margin: 0 0 10px;\r\n  font-size: 21px;\r\n}\r\n\r\n#leeyee-standby-generator-ats-guide .leeyee-p68-related ul {\r\n  margin: 0;\r\n}\r\n\r\n#leeyee-standby-generator-ats-guide .leeyee-p68-cta {\r\n  margin: 32px 0 42px;\r\n  padding: 24px;\r\n  background: #fff;\r\n  border: 1px solid #ccdce9;\r\n  border-radius: 11px;\r\n  box-shadow: 0 7px 20px rgba(25, 60, 90, 0.07);\r\n}\r\n\r\n#leeyee-standby-generator-ats-guide .leeyee-p68-cta h3 {\r\n  margin: 0 0 8px;\r\n  font-size: 23px;\r\n}\r\n\r\n#leeyee-standby-generator-ats-guide .leeyee-p68-cta p {\r\n  margin-bottom: 18px;\r\n}\r\n\r\n#leeyee-standby-generator-ats-guide .leeyee-about-btn-light.leeyee-site-popup-btn {\r\n  min-height: 50px;\r\n  display: inline-flex;\r\n  align-items: center;\r\n  justify-content: center;\r\n  appearance: none;\r\n  -webkit-appearance: none;\r\n  padding: 11px 24px;\r\n  background: #fff;\r\n  border: 2px solid var(--ly-blue);\r\n  border-radius: 10px;\r\n  color: var(--ly-blue);\r\n  font: inherit;\r\n  font-size: 16px;\r\n  line-height: 1.3;\r\n  font-weight: 700;\r\n  text-align: center;\r\n  cursor: pointer;\r\n  box-shadow: 0 5px 14px rgba(0, 72, 152, 0.11);\r\n  transition: background-color .18s ease, color .18s ease, transform .18s ease, box-shadow .18s ease;\r\n}\r\n\r\n#leeyee-standby-generator-ats-guide .leeyee-about-btn-light.leeyee-site-popup-btn:hover {\r\n  background: var(--ly-blue);\r\n  color: #fff;\r\n  transform: translateY(-1px);\r\n  box-shadow: 0 7px 18px rgba(0, 72, 152, 0.18);\r\n}\r\n\r\n#leeyee-standby-generator-ats-guide .leeyee-about-btn-light.leeyee-site-popup-btn:focus-visible {\r\n  outline: 3px solid rgba(0, 72, 152, 0.25);\r\n  outline-offset: 3px;\r\n}\r\n\r\n#leeyee-standby-generator-ats-guide .leeyee-about-btn-light.leeyee-site-popup-btn:active {\r\n  transform: translateY(0);\r\n}\r\n\r\n#leeyee-standby-generator-ats-guide .leeyee-p68-faq {\r\n  border-top: 1px solid var(--ly-line);\r\n}\r\n\r\n#leeyee-standby-generator-ats-guide .leeyee-p68-faq-item {\r\n  padding: 20px 0;\r\n  border-bottom: 1px solid var(--ly-line);\r\n}\r\n\r\n#leeyee-standby-generator-ats-guide .leeyee-p68-faq-item h3 {\r\n  margin: 0 0 9px;\r\n  font-size: 20px;\r\n  line-height: 1.38;\r\n}\r\n\r\n#leeyee-standby-generator-ats-guide .leeyee-p68-ref-list {\r\n  margin-bottom: 8px;\r\n  padding-left: 22px;\r\n  color: #4f6070;\r\n  font-size: 14.5px;\r\n  line-height: 1.6;\r\n}\r\n\r\n#leeyee-standby-generator-ats-guide .leeyee-p68-ref-list li {\r\n  margin: 10px 0;\r\n}\r\n\r\n#leeyee-standby-generator-ats-guide sup {\r\n  font-size: .72em;\r\n  line-height: 0;\r\n}\r\n\r\n#leeyee-standby-generator-ats-guide sup a {\r\n  font-weight: 700;\r\n  text-decoration: none;\r\n}\r\n\r\n@media (max-width: 768px) {\r\n  #leeyee-standby-generator-ats-guide {\r\n    padding: 4px 17px 40px;\r\n    font-size: 16px;\r\n    line-height: 1.68;\r\n  }\r\n\r\n  #leeyee-standby-generator-ats-guide h2 {\r\n    margin-top: 42px;\r\n  }\r\n\r\n  #leeyee-standby-generator-ats-guide .leeyee-p68-intro {\r\n    font-size: 17px;\r\n  }\r\n\r\n  #leeyee-standby-generator-ats-guide .leeyee-p68-quick,\r\n  #leeyee-standby-generator-ats-guide .leeyee-p68-checklist,\r\n  #leeyee-standby-generator-ats-guide .leeyee-p68-cta {\r\n    padding: 20px;\r\n  }\r\n\r\n  #leeyee-standby-generator-ats-guide table,\r\n  #leeyee-standby-generator-ats-guide thead,\r\n  #leeyee-standby-generator-ats-guide tbody,\r\n  #leeyee-standby-generator-ats-guide tr,\r\n  #leeyee-standby-generator-ats-guide th,\r\n  #leeyee-standby-generator-ats-guide td {\r\n    display: block;\r\n    width: 100%;\r\n  }\r\n\r\n  #leeyee-standby-generator-ats-guide table {\r\n    border: 0;\r\n    background: transparent;\r\n  }\r\n\r\n  #leeyee-standby-generator-ats-guide thead {\r\n    position: absolute;\r\n    width: 1px;\r\n    height: 1px;\r\n    overflow: hidden;\r\n    clip: rect(0 0 0 0);\r\n    white-space: nowrap;\r\n  }\r\n\r\n  #leeyee-standby-generator-ats-guide tbody tr {\r\n    margin: 0 0 14px;\r\n    overflow: hidden;\r\n    background: #fff;\r\n    border: 1px solid var(--ly-line);\r\n    border-radius: 9px;\r\n  }\r\n\r\n  #leeyee-standby-generator-ats-guide tbody tr:nth-child(even) {\r\n    background: #fff;\r\n  }\r\n\r\n  #leeyee-standby-generator-ats-guide td {\r\n    display: grid;\r\n    grid-template-columns: minmax(110px, 40%) minmax(0, 60%);\r\n    gap: 12px;\r\n    padding: 11px 13px;\r\n    border-right: 0;\r\n    border-bottom: 1px solid var(--ly-line);\r\n  }\r\n\r\n  #leeyee-standby-generator-ats-guide td:last-child {\r\n    border-bottom: 0;\r\n  }\r\n\r\n  #leeyee-standby-generator-ats-guide td::before {\r\n    content: attr(data-label);\r\n    color: var(--ly-blue);\r\n    font-weight: 700;\r\n  }\r\n}\r\n\r\n@media (max-width: 540px) {\r\n  #leeyee-standby-generator-ats-guide {\r\n    padding-left: 14px;\r\n    padding-right: 14px;\r\n  }\r\n\r\n  #leeyee-standby-generator-ats-guide .leeyee-p68-quick,\r\n  #leeyee-standby-generator-ats-guide .leeyee-p68-checklist,\r\n  #leeyee-standby-generator-ats-guide .leeyee-p68-cta,\r\n  #leeyee-standby-generator-ats-guide .leeyee-p68-warning,\r\n  #leeyee-standby-generator-ats-guide .leeyee-p68-note,\r\n  #leeyee-standby-generator-ats-guide .leeyee-p68-related {\r\n    padding: 17px;\r\n  }\r\n\r\n  #leeyee-standby-generator-ats-guide td {\r\n    grid-template-columns: 1fr;\r\n    gap: 4px;\r\n  }\r\n\r\n  #leeyee-standby-generator-ats-guide .leeyee-about-btn-light.leeyee-site-popup-btn {\r\n    width: 100%;\r\n    padding-left: 16px;\r\n    padding-right: 16px;\r\n  }\r\n\r\n  #leeyee-standby-generator-ats-guide .leeyee-p68-steps li {\r\n    padding-right: 14px;\r\n  }\r\n}\r\n\r\n@media (max-width: 390px) {\r\n  #leeyee-standby-generator-ats-guide {\r\n    padding-left: 12px;\r\n    padding-right: 12px;\r\n  }\r\n\r\n  #leeyee-standby-generator-ats-guide h2 {\r\n    font-size: 26px;\r\n  }\r\n\r\n  #leeyee-standby-generator-ats-guide h3 {\r\n    font-size: 21px;\r\n  }\r\n}\r\n<\/style>\r\n\r\n<article id=\"leeyee-standby-generator-ats-guide\">\r\n\r\n  <p class=\"leeyee-p68-intro\">\r\n    <strong>Selecting a standby generator ATS is not simply a matter of matching the generator kW rating.<\/strong>\r\n    The transfer switch must match the actual load current, system voltage, phase arrangement, neutral design, generator control interface, transfer sequence and project protection requirements.\r\n  <\/p>\r\n\r\n  <p>\r\n    This guide is for generator-set integrators, panel builders, electrical contractors, distributors and project procurement teams that already know a standby generator is required and now need to specify the ATS correctly.\r\n  <\/p>\r\n\r\n  <p>\r\n    The focus is ordinary <strong>compact open-transition utility-to-generator switching<\/strong>. Closed-transition paralleling, bypass-isolation assemblies, large service-entrance transfer equipment and zero-interruption systems require different engineering solutions.\r\n  <\/p>\r\n\r\n  <section class=\"leeyee-p68-quick\" aria-labelledby=\"p68-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\/it\/standby-generator-ats-selection-guide\/#quick-answer-what-ats-do-you-need-for-a-standby-generator\" >Quick Answer: What ATS Do You Need for a Standby Generator?<\/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\/it\/standby-generator-ats-selection-guide\/#1-start-with-the-standby-power-architecture\" >1. Start With the Standby Power Architecture<\/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\/it\/standby-generator-ats-selection-guide\/#2-size-the-ats-from-the-load-%e2%80%94-not-generator-kw-alone\" >2. Size the ATS From the Load \u2014 Not Generator kW Alone<\/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\/it\/standby-generator-ats-selection-guide\/#3-match-voltage-and-phase-before-choosing-the-pole-arrangement\" >3. Match Voltage and Phase Before Choosing the Pole Arrangement<\/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\/it\/standby-generator-ats-selection-guide\/#4-confirm-the-generator-start-interface\" >4. Confirm the Generator Start Interface<\/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\/it\/standby-generator-ats-selection-guide\/#5-confirm-the-required-delay-logic\" >5. Confirm the Required Delay Logic<\/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\/it\/standby-generator-ats-selection-guide\/#6-understand-the-actual-leeyee-front-panel-indicators\" >6. Understand the Actual LEEYEE Front-Panel Indicators<\/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\/it\/standby-generator-ats-selection-guide\/#7-open-transition-is-the-normal-starting-point-for-compact-standby-systems\" >7. Open Transition Is the Normal Starting Point for Compact Standby Systems<\/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\/it\/standby-generator-ats-selection-guide\/#8-do-not-treat-this-compact-ats-as-a-whole-building-service-entrance-switch\" >8. Do Not Treat This Compact ATS as a Whole-Building Service-Entrance Switch<\/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\/it\/standby-generator-ats-selection-guide\/#9-current-rating-is-only-one-part-of-product-approval\" >9. Current Rating Is Only One Part of Product Approval<\/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\/it\/standby-generator-ats-selection-guide\/#10-use-this-selection-sequence-before-fixing-the-ats-model\" >10. Use This Selection Sequence Before Fixing the ATS Model<\/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\/it\/standby-generator-ats-selection-guide\/#11-typical-b2b-selection-scenarios\" >11. Typical B2B Selection Scenarios<\/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\/it\/standby-generator-ats-selection-guide\/#12-where-the-leeyee-compact-ats-fits\" >12. Where the LEEYEE Compact ATS Fits<\/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\/it\/standby-generator-ats-selection-guide\/#13-five-common-specification-mistakes\" >13. Five Common Specification Mistakes<\/a><\/li><li class='ez-toc-page-1 ez-toc-heading-level-2'><a class=\"ez-toc-link ez-toc-heading-15\" href=\"#\" data-href=\"https:\/\/www.cnspd.com\/it\/standby-generator-ats-selection-guide\/#14-what-to-send-before-requesting-a-standby-generator-ats\" >14. What to Send Before Requesting a Standby Generator ATS<\/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\/it\/standby-generator-ats-selection-guide\/#frequently-asked-questions\" >Frequently Asked Questions<\/a><\/li><li class='ez-toc-page-1 ez-toc-heading-level-2'><a class=\"ez-toc-link ez-toc-heading-17\" href=\"#\" data-href=\"https:\/\/www.cnspd.com\/it\/standby-generator-ats-selection-guide\/#references\" >References<\/a><\/li><\/ul><\/nav><\/div>\n<h2 id=\"p68-quick-answer\"><span class=\"ez-toc-section\" id=\"quick-answer-what-ats-do-you-need-for-a-standby-generator\"><\/span>Quick Answer: What ATS Do You Need for a Standby Generator?<span class=\"ez-toc-section-end\"><\/span><\/h2>\r\n\r\n    <p>\r\n      Start with the load. Confirm continuous load current and load type first. Then match voltage, phase and pole arrangement. Finally, confirm the generator start interface, source-acceptance logic, transfer delays and protection coordination before fixing the ATS model.<sup><a href=\"#p68-ref-2\">[2]<\/a><\/sup>\r\n    <\/p>\r\n\r\n    <div class=\"leeyee-p68-table-wrap\">\r\n      <table aria-label=\"Standby generator ATS quick selection table\">\r\n        <thead>\r\n          <tr>\r\n            <th style=\"width:27%\">Check<\/th>\r\n            <th style=\"width:36%\">Confirm<\/th>\r\n            <th style=\"width:37%\">Buyer Meaning<\/th>\r\n          <\/tr>\r\n        <\/thead>\r\n        <tbody>\r\n          <tr>\r\n            <td data-label=\"Check\"><strong>Load current<\/strong><\/td>\r\n            <td data-label=\"Confirm\">Continuous design current and load characteristics<\/td>\r\n            <td data-label=\"Buyer meaning\">Defines the basic current requirement<\/td>\r\n          <\/tr>\r\n          <tr>\r\n            <td data-label=\"Check\"><strong>Voltage<\/strong><\/td>\r\n            <td data-label=\"Confirm\">Normal and generator source voltage<\/td>\r\n            <td data-label=\"Buyer meaning\">Both sources must match the ATS rating<\/td>\r\n          <\/tr>\r\n          <tr>\r\n            <td data-label=\"Check\"><strong>Phase<\/strong><\/td>\r\n            <td data-label=\"Confirm\">Single-phase or three-phase<\/td>\r\n            <td data-label=\"Buyer meaning\">Affects switching and monitoring arrangement<\/td>\r\n          <\/tr>\r\n          <tr>\r\n            <td data-label=\"Check\"><strong>Neutral<\/strong><\/td>\r\n            <td data-label=\"Confirm\">Solid or switched neutral<\/td>\r\n            <td data-label=\"Buyer meaning\">Depends on system grounding design<\/td>\r\n          <\/tr>\r\n          <tr>\r\n            <td data-label=\"Check\"><strong>Generator control<\/strong><\/td>\r\n            <td data-label=\"Confirm\">Required start \/ stop interface<\/td>\r\n            <td data-label=\"Buyer meaning\">ATS and genset controls must be compatible<\/td>\r\n          <\/tr>\r\n          <tr>\r\n            <td data-label=\"Check\"><strong>Timing<\/strong><\/td>\r\n            <td data-label=\"Confirm\">Start, transfer, retransfer and cooldown logic<\/td>\r\n            <td data-label=\"Buyer meaning\">Defines system response after source changes<\/td>\r\n          <\/tr>\r\n          <tr>\r\n            <td data-label=\"Check\"><strong>Load duty<\/strong><\/td>\r\n            <td data-label=\"Confirm\">Resistive, lightly inductive, motor or mixed<\/td>\r\n            <td data-label=\"Buyer meaning\">Rated amperes alone do not define switching suitability<\/td>\r\n          <\/tr>\r\n        <\/tbody>\r\n      <\/table>\r\n    <\/div>\r\n\r\n    <div class=\"leeyee-p68-keyline\">\r\n      Do not select the ATS from generator kW alone.\r\n    <\/div>\r\n  <\/section>\r\n\r\n  <figure class=\"leeyee-p68-product-figure\">\r\n    <img\r\n      src=\"https:\/\/www.cnspd.com\/wp-content\/uploads\/2026\/06\/2.png\"\r\n      alt=\"LEEYEE ATS-2P63 and ATS-4P63 compact automatic transfer switches for generator and grid backup power\"\r\n      loading=\"lazy\"\r\n      decoding=\"async\">\r\n    <figcaption>\r\n      Real LEEYEE ATS-2P63 and ATS-4P63 compact automatic transfer switches. The front panels show A\/B source positions, Auto\/Manual operation, load indication and generator\/grid application markings.\r\n    <\/figcaption>\r\n  <\/figure>\r\n\r\n  <h2><span class=\"ez-toc-section\" id=\"1-start-with-the-standby-power-architecture\"><\/span>1. Start With the Standby Power Architecture<span class=\"ez-toc-section-end\"><\/span><\/h2>\r\n\r\n  <p>\r\n    A basic standby-generator system has two sources and one load. Utility power is normally the <strong>Normal source<\/strong>. The generator is the <strong>Emergency source<\/strong>. The ATS connects the load to the appropriate source according to its control logic.\r\n  <\/p>\r\n\r\n  <p>\r\n    In an open-transition system, the load is disconnected from one source before connection to the other. The two sources are not intentionally paralleled during transfer.<sup><a href=\"#p68-ref-1\">[1]<\/a><\/sup>\r\n  <\/p>\r\n\r\n  <p>\r\n    The power path and the generator-control path should be treated as separate engineering questions. The ATS must carry the load current correctly, while the generator controller must receive the correct command and reach acceptable electrical conditions before transfer is allowed.<sup><a href=\"#p68-ref-2\">[2]<\/a><\/sup><sup><a href=\"#p68-ref-3\">[3]<\/a><\/sup>\r\n  <\/p>\r\n\r\n  <div class=\"leeyee-p68-meaning\">\r\n    <strong>Buyer meaning:<\/strong> send the utility voltage, generator output, load current, phase, neutral arrangement and generator-controller information. A generator model number alone is not enough.\r\n  <\/div>\r\n\r\n  <div class=\"leeyee-p68-related\">\r\n    <h3>Related technical guide<\/h3>\r\n    <ul>\r\n      <li>\r\n        For a broader explanation of ATS operation, pole selection, switching time and general model selection, see\r\n        <a href=\"https:\/\/www.cnspd.com\/what-is-an-automatic-transfer-switch-how-ats-works-how-to-choose\/\">\r\n          What Is an Automatic Transfer Switch? How ATS Works &amp; How to Choose\r\n        <\/a>.\r\n      <\/li>\r\n    <\/ul>\r\n  <\/div>\r\n\r\n  <h2><span class=\"ez-toc-section\" id=\"2-size-the-ats-from-the-load-%e2%80%94-not-generator-kw-alone\"><\/span>2. Size the ATS From the Load \u2014 Not Generator kW Alone<span class=\"ez-toc-section-end\"><\/span><\/h2>\r\n\r\n  <p>\r\n    The ATS must carry the design load within its rated operating conditions. Generator capacity is important system information, but generator kW or kVA does not by itself define the correct transfer-switch rating.\r\n  <\/p>\r\n\r\n  <p>\r\n    First determine the actual continuous load current. Then identify the load characteristics. Heating loads, transformers, pumps, compressors and motors do not impose the same switching duty.\r\n  <\/p>\r\n\r\n  <p>\r\n    Cummins transfer-switch application guidance separates continuous-current rating from switching-duty considerations and explains that IEC utilisation categories distinguish different load characteristics, including lightly inductive and motor-related duties.<sup><a href=\"#p68-ref-2\">[2]<\/a><\/sup>\r\n  <\/p>\r\n\r\n  <div class=\"leeyee-p68-warning\">\r\n    <p>\r\n      <strong>A larger ampere rating does not automatically make an ATS suitable for every load.<\/strong>\r\n      Utilisation category, load duty, short-circuit conditions and protection coordination must also be checked against the exact product data and project design.<sup><a href=\"#p68-ref-1\">[1]<\/a><\/sup><sup><a href=\"#p68-ref-2\">[2]<\/a><\/sup>\r\n    <\/p>\r\n  <\/div>\r\n\r\n  <h3>Information to prepare before sizing<\/h3>\r\n\r\n  <ul>\r\n    <li>Continuous design load current<\/li>\r\n    <li>Generator kW or kVA<\/li>\r\n    <li>Largest motor or significant inrush load, if applicable<\/li>\r\n    <li>Normal and generator source voltage<\/li>\r\n    <li>Required utilisation category, if specified<\/li>\r\n    <li>Prospective short-circuit current where required for coordination<\/li>\r\n    <li>Upstream protective device<\/li>\r\n  <\/ul>\r\n\r\n  <h2><span class=\"ez-toc-section\" id=\"3-match-voltage-and-phase-before-choosing-the-pole-arrangement\"><\/span>3. Match Voltage and Phase Before Choosing the Pole Arrangement<span class=\"ez-toc-section-end\"><\/span><\/h2>\r\n\r\n  <p>\r\n    Confirm the operating voltage and frequency of both sources before selecting the ATS. The normal source and generator must also provide the phase arrangement required by the load.\r\n  <\/p>\r\n\r\n  <p>\r\n    The LEEYEE compact family shown above includes <strong>ATS-2P63 and ATS-4P63<\/strong> configurations. A 2P model is relevant to certain single-phase systems, while a 4P model can be relevant where four conductors must be transferred.\r\n  <\/p>\r\n\r\n  <p>\r\n    <strong>Do not use the shortcut \u201cthree phase always means 4P.\u201d<\/strong>\r\n    Transfer-switch designs may use a solid neutral or a switched neutral. The correct arrangement depends on grounding architecture, generator neutral bonding and whether the alternate source is treated as a separately derived system.<sup><a href=\"#p68-ref-4\">[4]<\/a><\/sup>\r\n  <\/p>\r\n\r\n  <div class=\"leeyee-p68-note\">\r\n    <p>\r\n      <strong>Engineering confirmation:<\/strong> if the grounding arrangement, neutral bond or single-line diagram is uncertain, confirm the neutral-switching requirement with the project electrical engineer before fixing the ATS pole count.\r\n    <\/p>\r\n  <\/div>\r\n\r\n  <h2><span class=\"ez-toc-section\" id=\"4-confirm-the-generator-start-interface\"><\/span>4. Confirm the Generator Start Interface<span class=\"ez-toc-section-end\"><\/span><\/h2>\r\n\r\n  <p>\r\n    The real ATS-4P63 product image identifies generator and grid source roles on the front panel. This supports the intended generator\/grid transfer application, but the front-panel markings alone do not prove which generator-start interface is available on every model.\r\n  <\/p>\r\n\r\n  <div class=\"leeyee-p68-note\">\r\n    <p>\r\n      <strong>Before ordering, confirm what start \/ stop interface the generator controller requires and whether the exact ATS model provides the required connection.<\/strong>\r\n    <\/p>\r\n  <\/div>\r\n\r\n  <p>\r\n    In a typical standby arrangement, the transfer-control system issues a start request after the normal source is judged unacceptable. The generator controller then handles cranking, engine start and voltage\/frequency build-up before the emergency source can be accepted.<sup><a href=\"#p68-ref-2\">[2]<\/a><\/sup><sup><a href=\"#p68-ref-3\">[3]<\/a><\/sup>\r\n  <\/p>\r\n\r\n  <p>\r\n    Do not infer a two-wire dry-contact output, dedicated terminal number or communication protocol from the product appearance alone. Confirm the start-interface wiring from the technical documentation for the exact ATS and generator controller.\r\n  <\/p>\r\n\r\n  <div class=\"leeyee-p68-meaning\">\r\n    <strong>Buyer meaning:<\/strong> send the generator-controller model or start-interface diagram together with the ATS enquiry.\r\n  <\/div>\r\n\r\n  <h2><span class=\"ez-toc-section\" id=\"5-confirm-the-required-delay-logic\"><\/span>5. Confirm the Required Delay Logic<span class=\"ez-toc-section-end\"><\/span><\/h2>\r\n\r\n  <p>\r\n    There is no universal best delay setting for every standby generator. The required timing depends on the generator, controller, load and project specification.\r\n  <\/p>\r\n\r\n  <div class=\"leeyee-p68-table-wrap\">\r\n    <table aria-label=\"Standby generator ATS timing functions\">\r\n      <thead>\r\n        <tr>\r\n          <th style=\"width:28%\">Timing Function<\/th>\r\n          <th style=\"width:39%\">Purpose<\/th>\r\n          <th style=\"width:33%\">What to Confirm<\/th>\r\n        <\/tr>\r\n      <\/thead>\r\n      <tbody>\r\n        <tr>\r\n          <td data-label=\"Timing function\"><strong>Failure \/ start delay<\/strong><\/td>\r\n          <td data-label=\"Purpose\">Avoids reacting immediately to a brief normal-source disturbance<\/td>\r\n          <td data-label=\"What to confirm\">When should the generator start?<\/td>\r\n        <\/tr>\r\n        <tr>\r\n          <td data-label=\"Timing function\"><strong>Transfer delay<\/strong><\/td>\r\n          <td data-label=\"Purpose\">Allows the emergency source to reach acceptable conditions<\/td>\r\n          <td data-label=\"What to confirm\">When is the generator ready for load?<\/td>\r\n        <\/tr>\r\n        <tr>\r\n          <td data-label=\"Timing function\"><strong>Retransfer delay<\/strong><\/td>\r\n          <td data-label=\"Purpose\">Allows restored utility power to remain stable before retransfer<\/td>\r\n          <td data-label=\"What to confirm\">How long should Normal be verified?<\/td>\r\n        <\/tr>\r\n        <tr>\r\n          <td data-label=\"Timing function\"><strong>Cooldown<\/strong><\/td>\r\n          <td data-label=\"Purpose\">Allows generator operation after the load returns to Normal before shutdown<\/td>\r\n          <td data-label=\"What to confirm\">What does the genset manufacturer require?<\/td>\r\n        <\/tr>\r\n      <\/tbody>\r\n    <\/table>\r\n  <\/div>\r\n\r\n  <p class=\"leeyee-p68-table-note\">\r\n    Controller terminology and available timer adjustments vary by model. Confirm the functions actually provided by the selected LEEYEE ATS instead of assuming every timer is independently adjustable.\r\n  <\/p>\r\n\r\n  <figure>\r\n    <img\r\n      src=\"https:\/\/www.cnspd.com\/wp-content\/uploads\/2026\/09\/standby-generator-ats-control-sequence.webp\"\r\n      alt=\"Standby generator ATS control sequence from utility failure to generator transfer and retransfer\"\r\n      loading=\"lazy\"\r\n      decoding=\"async\">\r\n    <figcaption>\r\n      Typical standby-generator control sequence. Exact voltage\/frequency acceptance thresholds and time delays are controller- and project-specific.\r\n    <\/figcaption>\r\n  <\/figure>\r\n\r\n  <p>\r\n    One distinction is especially important: <strong>ATS switching time is not the same as total standby-power restoration time.<\/strong>\r\n    A generator must first receive the start request, crank, accelerate and produce acceptable electrical output before the load can be transferred.<sup><a href=\"#p68-ref-2\">[2]<\/a><\/sup><sup><a href=\"#p68-ref-3\">[3]<\/a><\/sup>\r\n  <\/p>\r\n\r\n  <h2><span class=\"ez-toc-section\" id=\"6-understand-the-actual-leeyee-front-panel-indicators\"><\/span>6. Understand the Actual LEEYEE Front-Panel Indicators<span class=\"ez-toc-section-end\"><\/span><\/h2>\r\n\r\n  <p>\r\n    General ATS engineering documents often use terms such as <strong>Normal Available<\/strong>, <strong>Emergency Available<\/strong>, <strong>Load on Normal<\/strong> and <strong>Load on Emergency<\/strong>. These terms explain the operating logic, but they should not be presented as the exact words printed on this product.\r\n  <\/p>\r\n\r\n  <p>\r\n    On the real ATS-2P63 and ATS-4P63 front panels shown above, the visible markings include:\r\n  <\/p>\r\n\r\n  <ul>\r\n    <li><strong>A \/ B<\/strong> \u2014 identification of the two source positions<\/li>\r\n    <li><strong>AU \/ BU<\/strong> \u2014 source-related indication labels visible on the front panel<\/li>\r\n    <li><strong>Auto<\/strong> \u2014 automatic operating mode<\/li>\r\n    <li><strong>Manual<\/strong> \u2014 manual operation<\/li>\r\n    <li><strong>Carga ON<\/strong> \u2014 load-on indication visible on the product shown<\/li>\r\n    <li><strong>Generador \/ Red<\/strong> \u2014 generator and grid markings visible on the ATS-4P63<\/li>\r\n  <\/ul>\r\n\r\n  <p>\r\n    A source being available is not necessarily the same as the load being connected to that source. The exact meaning of each indication and operating condition should be confirmed from the model documentation.\r\n  <\/p>\r\n\r\n  <div class=\"leeyee-p68-warning\">\r\n    <p>\r\n      <strong>Do not claim unsupported alarm or communication functions.<\/strong>\r\n      The product image does not by itself prove a dedicated Fault Alarm output, remote alarm contact, Modbus function or BMS interface. These functions must be verified model by model.\r\n    <\/p>\r\n  <\/div>\r\n\r\n  <h2><span class=\"ez-toc-section\" id=\"7-open-transition-is-the-normal-starting-point-for-compact-standby-systems\"><\/span>7. Open Transition Is the Normal Starting Point for Compact Standby Systems<span class=\"ez-toc-section-end\"><\/span><\/h2>\r\n\r\n  <p>\r\n    Open transition is a break-before-make transfer method. The load is disconnected from the first source before connection to the second source, creating an intentional interruption during transfer.<sup><a href=\"#p68-ref-2\">[2]<\/a><\/sup>\r\n  <\/p>\r\n\r\n  <p>\r\n    For ordinary standby loads that can tolerate this interruption, a compact open-transition ATS is a practical starting point for selection.\r\n  <\/p>\r\n\r\n  <p>\r\n    It should not be confused with a UPS or no-break system. Loads requiring uninterrupted power, synchronized source paralleling, closed transition or bypass isolation need a different engineered solution.\r\n  <\/p>\r\n\r\n  <h2><span class=\"ez-toc-section\" id=\"8-do-not-treat-this-compact-ats-as-a-whole-building-service-entrance-switch\"><\/span>8. Do Not Treat This Compact ATS as a Whole-Building Service-Entrance Switch<span class=\"ez-toc-section-end\"><\/span><\/h2>\r\n\r\n  <p>\r\n    The LEEYEE ATS-2P63 and ATS-4P63 shown here are compact devices intended for installation within suitable low-voltage distribution or control arrangements. They should not automatically be treated as whole-building service-entrance transfer switches simply because the current rating appears sufficient.\r\n  <\/p>\r\n\r\n  <p>Before specifying a compact ATS, confirm:<\/p>\r\n\r\n  <ul>\r\n    <li>Installation position in the distribution system<\/li>\r\n    <li>Upstream disconnect and protective device<\/li>\r\n    <li>Panel or enclosure suitability<\/li>\r\n    <li>Available short-circuit current<\/li>\r\n    <li>Required local standard and approval scope<\/li>\r\n    <li>Whether the project requires service-entrance-rated equipment or another specialised transfer assembly<\/li>\r\n  <\/ul>\r\n\r\n  <div class=\"leeyee-p68-meaning\">\r\n    <strong>Engineering meaning:<\/strong> a compact ATS may be suitable inside a backup distribution or control panel without being suitable as the service-entrance transfer device for the entire installation.\r\n  <\/div>\r\n\r\n  <h2><span class=\"ez-toc-section\" id=\"9-current-rating-is-only-one-part-of-product-approval\"><\/span>9. Current Rating Is Only One Part of Product Approval<span class=\"ez-toc-section-end\"><\/span><\/h2>\r\n\r\n  <p>\r\n    IEC 60947-6-1 covers low-voltage transfer switching equipment within its stated scope. The current edition is <strong>IEC 60947-6-1:2026, Edition 4.0<\/strong>.<sup><a href=\"#p68-ref-1\">[1]<\/a><\/sup>\r\n  <\/p>\r\n\r\n  <p>\r\n    A standard reference does not prove that every ATS model meets every project requirement. Model-specific technical documentation, test evidence and certificate scope still need to be verified.\r\n  <\/p>\r\n\r\n  <h3>Load duty<\/h3>\r\n\r\n  <p>\r\n    IEC utilisation categories distinguish different switching duties. This is especially important when the standby load includes motors, pumps, compressors or other equipment with significant inductive or starting characteristics.<sup><a href=\"#p68-ref-2\">[2]<\/a><\/sup>\r\n  <\/p>\r\n\r\n  <h3>Short-circuit coordination<\/h3>\r\n\r\n  <p>\r\n    The available fault current at the installation point, ATS short-circuit capability and upstream protective device must be checked together according to the product data and applicable project requirements.<sup><a href=\"#p68-ref-1\">[1]<\/a><\/sup><sup><a href=\"#p68-ref-2\">[2]<\/a><\/sup>\r\n  <\/p>\r\n\r\n  <div class=\"leeyee-p68-meaning\">\r\n    <strong>Buyer meaning:<\/strong> \u201cI need a 63 A ATS\u201d is not a complete specification. Current, voltage, load duty, pole arrangement, fault conditions and control requirements must all be reviewed.\r\n  <\/div>\r\n\r\n  <h2><span class=\"ez-toc-section\" id=\"10-use-this-selection-sequence-before-fixing-the-ats-model\"><\/span>10. Use This Selection Sequence Before Fixing the ATS Model<span class=\"ez-toc-section-end\"><\/span><\/h2>\r\n\r\n  <figure>\r\n    <img\r\n      src=\"https:\/\/www.cnspd.com\/wp-content\/uploads\/2026\/09\/standby-generator-ats-selection-flow.webp\"\r\n      alt=\"Standby generator ATS selection flow for current voltage phase poles start signal and time delays\"\r\n      loading=\"lazy\"\r\n      decoding=\"async\">\r\n    <figcaption>\r\n      Recommended standby-generator ATS selection path: define the load and electrical system first, then verify control and protection requirements before approving the model.\r\n    <\/figcaption>\r\n  <\/figure>\r\n\r\n  <ol class=\"leeyee-p68-steps\">\r\n    <li><strong>Define the load.<\/strong> Record continuous current and identify significant motor or inrush loads.<\/li>\r\n    <li><strong>Confirm both sources.<\/strong> Record utility and generator voltage, frequency and phase.<\/li>\r\n    <li><strong>Confirm the neutral design.<\/strong> Determine whether the neutral remains solid or must be switched.<\/li>\r\n    <li><strong>Check the genset controller.<\/strong> Provide its start \/ stop interface requirement.<\/li>\r\n    <li><strong>Confirm timing needs.<\/strong> Define source-acceptance, transfer, retransfer and cooldown behaviour.<\/li>\r\n    <li><strong>Confirm transition type.<\/strong> Use open transition only when the load can tolerate the interruption.<\/li>\r\n    <li><strong>Check protection coordination.<\/strong> Review fault current and upstream protective devices.<\/li>\r\n    <li><strong>Verify the exact model.<\/strong> Confirm ratings, terminals, dimensions, functions and applicable compliance documents.<\/li>\r\n  <\/ol>\r\n\r\n  <h2><span class=\"ez-toc-section\" id=\"11-typical-b2b-selection-scenarios\"><\/span>11. Typical B2B Selection Scenarios<span class=\"ez-toc-section-end\"><\/span><\/h2>\r\n\r\n  <h3>Commercial backup distribution panel<\/h3>\r\n\r\n  <p>\r\n    A commercial panel uses utility power as Normal and a standby generator as Emergency. Once load current and voltage are known, the remaining decisions include phase, neutral arrangement, generator start interface, transfer logic and protection coordination.\r\n  <\/p>\r\n\r\n  <h3>Single-phase project considering the ATS-2P63<\/h3>\r\n\r\n  <p>\r\n    The 2P model shown in the real product image is relevant to compact single-phase applications where two conductors must be transferred. The exact voltage, neutral arrangement and grounding requirements still need to be confirmed before the model is fixed.\r\n  <\/p>\r\n\r\n  <h3>Three-phase project considering the ATS-4P63<\/h3>\r\n\r\n  <p>\r\n    The 4P model shown can support applications where four conductors are required to switch, but a three-phase four-wire system does not automatically mean that every project requires a 4P ATS. Grounding and neutral treatment must be confirmed first.<sup><a href=\"#p68-ref-4\">[4]<\/a><\/sup>\r\n  <\/p>\r\n\r\n  <h3>Factory panel with motor loads<\/h3>\r\n\r\n  <p>\r\n    If the standby load contains pumps, compressors or fans, provide the motor details before assuming the compact ATS is suitable. Load-duty suitability must be checked against the exact product rating and application requirements.<sup><a href=\"#p68-ref-2\">[2]<\/a><\/sup>\r\n  <\/p>\r\n\r\n  <h2><span class=\"ez-toc-section\" id=\"12-where-the-leeyee-compact-ats-fits\"><\/span>12. Where the LEEYEE Compact ATS Fits<span class=\"ez-toc-section-end\"><\/span><\/h2>\r\n\r\n  <p>\r\n    The real product shown on this page is a compact LEEYEE automatic transfer switch family with <strong>ATS-2P63 and ATS-4P63<\/strong> front-panel configurations. The products use an integrated operating mechanism and front-panel Auto \/ Manual control in a compact form suitable for installation inside low-voltage distribution or control equipment.\r\n  <\/p>\r\n\r\n  <p>\r\n    Published technical data for the\r\n    <a href=\"https:\/\/www.cnspd.com\/products\/leeyee-automatic-transfer-switch-solar-backup\">\r\n      LEEYEE ATS-63 automatic transfer switch\r\n    <\/a>\r\n    lists rated-current options from <strong>6 A to 63 A<\/strong>, <strong>2P and 4P<\/strong> versions, <strong>AC110 V \/ AC220 V \/ AC400 V<\/strong>, <strong>50\/60 Hz<\/strong>, <strong>PC class<\/strong>, <strong>AC-31B<\/strong> utilisation category and DIN-rail installation.<sup><a href=\"#p68-ref-5\">[5]<\/a><\/sup>\r\n  <\/p>\r\n\r\n  <div class=\"leeyee-p68-warning\">\r\n    <p>\r\n      <strong>Product boundary:<\/strong> do not treat the visible Generator\/Grid markings as proof that every generator controller can be started directly by every ATS-63 variant. Likewise, AC-31B data should not be interpreted as automatic approval for every motor-heavy or mixed-load application.\r\n    <\/p>\r\n  <\/div>\r\n\r\n  <p>\r\n    LEEYEE's standard compact ATS should not be represented as a closed-transition system, bypass-isolation ATS, source-paralleling switchgear, large service-entrance ATS or no-break power solution.\r\n  <\/p>\r\n\r\n  <div class=\"leeyee-p68-related\">\r\n    <h3>Product technical data<\/h3>\r\n    <ul>\r\n      <li>\r\n        <a href=\"https:\/\/www.cnspd.com\/products\/leeyee-automatic-transfer-switch-solar-backup\">\r\n          View the LEEYEE ATS-63 technical data, dimensions and wiring information\r\n        <\/a>.\r\n      <\/li>\r\n    <\/ul>\r\n  <\/div>\r\n\r\n  <h2><span class=\"ez-toc-section\" id=\"13-five-common-specification-mistakes\"><\/span>13. Five Common Specification Mistakes<span class=\"ez-toc-section-end\"><\/span><\/h2>\r\n\r\n  <ol>\r\n    <li><strong>Selecting the ATS from generator kW alone.<\/strong> Generator capacity does not replace load-current and switching-duty review.<\/li>\r\n    <li><strong>Assuming 2P or 4P can be chosen from phase count alone.<\/strong> Neutral and grounding design matter.<\/li>\r\n    <li><strong>Assuming the Generator marking proves a universal generator-start interface.<\/strong> The exact control connection must be verified.<\/li>\r\n    <li><strong>Confusing switch transfer time with complete generator restoration time.<\/strong> Generator startup occurs before transfer.<\/li>\r\n    <li><strong>Checking current rating but ignoring load duty and fault coordination.<\/strong> A complete approval requires more than an ampere value.<\/li>\r\n  <\/ol>\r\n\r\n  <h2><span class=\"ez-toc-section\" id=\"14-what-to-send-before-requesting-a-standby-generator-ats\"><\/span>14. What to Send Before Requesting a Standby Generator ATS<span class=\"ez-toc-section-end\"><\/span><\/h2>\r\n\r\n  <div class=\"leeyee-p68-checklist\">\r\n    <h3>Standby Generator ATS RFQ Checklist<\/h3>\r\n    <ul>\r\n      <li>Generator rating in kW or kVA<\/li>\r\n      <li>Generator output voltage and frequency<\/li>\r\n      <li>Single-phase or three-phase system<\/li>\r\n      <li>Continuous load current<\/li>\r\n      <li>Load characteristics<\/li>\r\n      <li>Normal-source voltage and phase<\/li>\r\n      <li>Required 2P \/ 4P arrangement, if already defined<\/li>\r\n      <li>Neutral and grounding arrangement<\/li>\r\n      <li>Generator-controller model or start-interface diagram<\/li>\r\n      <li>Required transfer, retransfer and cooldown behaviour<\/li>\r\n      <li>Auto \/ Manual operating requirements<\/li>\r\n      <li>Required status or auxiliary outputs<\/li>\r\n      <li>Prospective short-circuit current where applicable<\/li>\r\n      <li>Upstream protective device<\/li>\r\n      <li>Installation space and mounting requirement<\/li>\r\n      <li>Destination market and required standard \/ certificate scope<\/li>\r\n      <li>Quantity and OEM label or packaging requirements<\/li>\r\n    <\/ul>\r\n  <\/div>\r\n\r\n  <div class=\"leeyee-p68-cta\">\r\n    <h3>Need Help Confirming a LEEYEE Compact ATS?<\/h3>\r\n\r\n    <p>\r\n      Send your generator output, load current, voltage, phase, neutral arrangement and controller requirement. LEEYEE can review whether an ATS-2P63 \/ ATS-4P63 configuration fits the application or whether another solution is required.\r\n    <\/p>\r\n\r\n    <button\r\n      type=\"button\"\r\n      class=\"leeyee-about-btn-light leeyee-site-popup-btn\"\r\n      aria-label=\"Request ATS Selection Review\">\r\n      <span class=\"w-btn-label\">Request ATS Selection Review<\/span>\r\n    <\/button>\r\n  <\/div>\r\n\r\n  <h2><span class=\"ez-toc-section\" id=\"frequently-asked-questions\"><\/span>Frequently Asked Questions<span class=\"ez-toc-section-end\"><\/span><\/h2>\r\n\r\n  <div class=\"leeyee-p68-faq\">\r\n\r\n    <div class=\"leeyee-p68-faq-item\">\r\n      <h3>What size ATS do I need for a standby generator?<\/h3>\r\n      <p>\r\n        Start with continuous design load current, then confirm load type, voltage, phase, neutral arrangement, control interface and protection conditions. Generator kW alone is not enough to specify the ATS.\r\n      <\/p>\r\n    <\/div>\r\n\r\n    <div class=\"leeyee-p68-faq-item\">\r\n      <h3>Can the LEEYEE ATS-2P63 and ATS-4P63 be used with a generator?<\/h3>\r\n      <p>\r\n        The actual product markings show generator\/grid transfer use, so generator backup is a relevant application. However, the exact voltage, load, pole arrangement, generator start interface and protection requirements still need project-specific confirmation.\r\n      <\/p>\r\n    <\/div>\r\n\r\n    <div class=\"leeyee-p68-faq-item\">\r\n      <h3>Does the generator marking mean the ATS can start every generator automatically?<\/h3>\r\n      <p>\r\n        No. The product image confirms generator\/grid application marking, but it does not prove universal compatibility with every genset controller. Confirm the exact start \/ stop interface from the current wiring documentation.\r\n      <\/p>\r\n    <\/div>\r\n\r\n    <div class=\"leeyee-p68-faq-item\">\r\n      <h3>Should I choose ATS-2P63 or ATS-4P63?<\/h3>\r\n      <p>\r\n        The choice depends on the system conductors and neutral arrangement, not only on current. A 2P model is relevant to certain single-phase applications, while 4P is relevant where four conductors must be transferred. Confirm grounding and neutral requirements before ordering.\r\n      <\/p>\r\n    <\/div>\r\n\r\n    <div class=\"leeyee-p68-faq-item\">\r\n      <h3>How long should the ATS wait before transferring to the generator?<\/h3>\r\n      <p>\r\n        There is no universal setting. Generator start time, source acceptance, load requirements and the available controller functions must be confirmed for the exact project.\r\n      <\/p>\r\n    <\/div>\r\n\r\n    <div class=\"leeyee-p68-faq-item\">\r\n      <h3>Is this compact ATS suitable for whole-building service entrance?<\/h3>\r\n      <p>\r\n        Do not assume so. The product shown is a compact panel-level ATS. Service-entrance applications can require additional ratings, approvals, disconnecting arrangements and enclosure requirements.\r\n      <\/p>\r\n    <\/div>\r\n\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=\"leeyee-p68-ref-list\">\r\n\r\n    <li id=\"p68-ref-1\">\r\n      <strong>International Electrotechnical Commission (IEC).<\/strong>\r\n      <a href=\"https:\/\/webstore.iec.ch\/en\/publication\/90494\" target=\"_blank\" rel=\"noopener\">\r\n        IEC 60947-6-1:2026, Edition 4.0 \u2014 Transfer switching equipment\r\n      <\/a>.\r\n    <\/li>\r\n\r\n    <li id=\"p68-ref-2\">\r\n      <strong>Cummins Power Generation.<\/strong>\r\n      <a href=\"https:\/\/www.cummins.com\/sites\/default\/files\/2024-08\/t011-Transfer-switch-application-manual.pdf\" target=\"_blank\" rel=\"noopener\">\r\n        T-011 Transfer Switch Application Manual\r\n      <\/a>.\r\n    <\/li>\r\n\r\n    <li id=\"p68-ref-3\">\r\n      <strong>Schneider Electric.<\/strong>\r\n      <a href=\"https:\/\/www.se.com\/us\/en\/work\/featured-articles\/what-is-a-transfer-switch\/\" target=\"_blank\" rel=\"noopener\">\r\n        What Is a Transfer Switch?\r\n      <\/a>.\r\n    <\/li>\r\n\r\n    <li id=\"p68-ref-4\">\r\n      <strong>Schneider Electric \/ ASCO Power Technologies.<\/strong>\r\n      Technical guidance on solid-neutral and switched-neutral transfer-switch configurations.\r\n    <\/li>\r\n\r\n    <li id=\"p68-ref-5\">\r\n      <strong>LEEYEE.<\/strong>\r\n      <a href=\"https:\/\/www.cnspd.com\/products\/leeyee-automatic-transfer-switch-solar-backup\">\r\n        ATS-63 Automatic Transfer Switch Product Technical Data\r\n      <\/a>.\r\n    <\/li>\r\n\r\n  <\/ol>\r\n\r\n<\/article>\r\n\r\n<script>\r\ndocument.addEventListener('DOMContentLoaded', function () {\r\n  var aboutPopupButtons = document.querySelectorAll('.leeyee-site-popup-btn');\r\n\r\n  aboutPopupButtons.forEach(function (button) {\r\n    button.addEventListener('click', function () {\r\n      var realPopupTrigger = document.querySelector(\r\n        '.w-popup.ush_popup_1 .w-popup-trigger'\r\n      );\r\n\r\n      if (realPopupTrigger) {\r\n        realPopupTrigger.click();\r\n      } else {\r\n        window.open(\r\n          'https:\/\/www.cnspd.com\/contact\/',\r\n          '_blank',\r\n          'noopener'\r\n        );\r\n      }\r\n    });\r\n  });\r\n});\r\n<\/script>\t\t\t\t<\/div>\n\t\t\t\t<\/div>\n\t\t\t\t\t<\/div>\n\t\t\t\t<\/div>\n\t\t\t\t<\/div>\n\t\t","protected":false},"excerpt":{"rendered":"<p>Selecting a standby generator ATS is not simply a matter of matching the generator kW rating. The transfer switch must match the actual load current, system voltage, phase arrangement, neutral design, generator control interface, transfer sequence and project protection requirements. This guide is for generator-set integrators, panel builders, electrical contractors, distributors and project procurement teams&#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-31658","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>Standby Generator ATS Selection Guide | LEEYEE<\/title>\n<meta name=\"description\" content=\"Learn how to select a standby generator ATS by load current, voltage, phase, 2P\/4P configuration, neutral arrangement, generator interface, transfer delays and protection requirements.\" \/>\n<meta name=\"robots\" content=\"index, follow, max-snippet:-1, max-image-preview:large, max-video-preview:-1\" \/>\n<link rel=\"canonical\" href=\"https:\/\/www.cnspd.com\/it\/standby-generator-ats-selection-guide\/\" \/>\n<meta property=\"og:locale\" content=\"it_IT\" \/>\n<meta property=\"og:type\" content=\"article\" \/>\n<meta property=\"og:title\" content=\"Standby Generator ATS Selection Guide | LEEYEE\" \/>\n<meta property=\"og:description\" content=\"Learn how to select a standby generator ATS by load current, voltage, phase, 2P\/4P configuration, neutral arrangement, generator interface, transfer delays and protection requirements.\" \/>\n<meta property=\"og:url\" content=\"https:\/\/www.cnspd.com\/it\/standby-generator-ats-selection-guide\/\" \/>\n<meta property=\"og:site_name\" content=\"Surge Protector, Surge Arrestor, Isolating Switch - LEEYEE\" \/>\n<meta property=\"article:published_time\" content=\"2026-10-14T01:21:07+00:00\" \/>\n<meta property=\"article:modified_time\" content=\"2026-10-14T01:21:34+00:00\" \/>\n<meta property=\"og:image\" content=\"https:\/\/www.cnspd.com\/wp-content\/uploads\/2026\/06\/2.png\" \/>\n<meta name=\"author\" content=\"Devin Ling\" \/>\n<meta name=\"twitter:card\" content=\"summary_large_image\" \/>\n<meta name=\"twitter:label1\" content=\"Scritto da\" \/>\n\t<meta name=\"twitter:data1\" content=\"Devin Ling\" \/>\n\t<meta name=\"twitter:label2\" content=\"Tempo di lettura stimato\" \/>\n\t<meta name=\"twitter:data2\" content=\"13 minuti\" \/>\n<script type=\"application\/ld+json\" class=\"yoast-schema-graph\">{\"@context\":\"https:\\\/\\\/schema.org\",\"@graph\":[{\"@type\":\"Article\",\"@id\":\"https:\\\/\\\/www.cnspd.com\\\/standby-generator-ats-selection-guide\\\/#article\",\"isPartOf\":{\"@id\":\"https:\\\/\\\/www.cnspd.com\\\/standby-generator-ats-selection-guide\\\/\"},\"author\":{\"name\":\"Devin Ling\",\"@id\":\"https:\\\/\\\/www.cnspd.com\\\/#\\\/schema\\\/person\\\/f49dbafe62c5b47100ad2d9f88af92d3\"},\"headline\":\"Standby Generator ATS Selection Guide: Current, Poles, Start Signal &#038; 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