{"id":31246,"date":"2026-09-22T09:46:53","date_gmt":"2026-09-22T01:46:53","guid":{"rendered":"https:\/\/www.cnspd.com\/?p=31246"},"modified":"2026-09-22T09:47:11","modified_gmt":"2026-09-22T01:47:11","slug":"dual-power-automatic-transfer-switch-selection-guide","status":"publish","type":"post","link":"https:\/\/www.cnspd.com\/id\/dual-power-automatic-transfer-switch\/","title":{"rendered":"Dual Power Automatic Transfer Switch Selection Guide"},"content":{"rendered":"\t\t<div data-elementor-type=\"wp-post\" data-elementor-id=\"31246\" class=\"elementor elementor-31246\" data-elementor-post-type=\"post\">\n\t\t\t\t<div class=\"elementor-element elementor-element-b35caa0 e-flex e-con-boxed e-con e-parent\" data-id=\"b35caa0\" 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-2902300 elementor-widget elementor-widget-html\" data-id=\"2902300\" 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-dual-ats-article,\r\n.leeyee-dual-ats-article * {\r\n  box-sizing: border-box;\r\n}\r\n\r\n.leeyee-dual-ats-article {\r\n  --lee-blue: #004898;\r\n  --lee-blue-dark: #00396f;\r\n  --lee-blue-soft: #eef5ff;\r\n  --lee-blue-softer: #f7fbff;\r\n  --lee-heading: #172735;\r\n  --lee-text: #2c3e4d;\r\n  --lee-muted: #657684;\r\n  --lee-line: #dbe5ed;\r\n  --lee-warn-bg: #fff9ed;\r\n  --lee-warn-line: #d39a28;\r\n\r\n  width: 100%;\r\n  max-width: 860px;\r\n  margin: 0 auto;\r\n  padding: 8px 20px 72px;\r\n  color: var(--lee-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-dual-ats-article p {\r\n  margin: 0 0 18px;\r\n}\r\n\r\n.leeyee-dual-ats-article strong {\r\n  color: var(--lee-heading);\r\n}\r\n\r\n.leeyee-dual-ats-article a {\r\n  color: var(--lee-blue);\r\n  text-decoration-thickness: 1px;\r\n  text-underline-offset: 2px;\r\n}\r\n\r\n.leeyee-dual-ats-article a:hover {\r\n  color: var(--lee-blue-dark);\r\n}\r\n\r\n.leeyee-dual-ats-article h2,\r\n.leeyee-dual-ats-article h3 {\r\n  color: var(--lee-heading);\r\n  font-weight: 800;\r\n  letter-spacing: -0.015em;\r\n}\r\n\r\n.leeyee-dual-ats-article h2 {\r\n  margin: 52px 0 18px;\r\n  font-size: clamp(28px, 3.2vw, 34px);\r\n  line-height: 1.2;\r\n}\r\n\r\n.leeyee-dual-ats-article h3 {\r\n  margin: 32px 0 12px;\r\n  font-size: clamp(21px, 2.4vw, 25px);\r\n  line-height: 1.3;\r\n}\r\n\r\n.leeyee-dual-ats-article .lee-kicker {\r\n  margin: 0 0 10px;\r\n  color: var(--lee-blue);\r\n  font-size: 13px;\r\n  font-weight: 800;\r\n  line-height: 1.4;\r\n  letter-spacing: .075em;\r\n  text-transform: uppercase;\r\n}\r\n\r\n.leeyee-dual-ats-article .lee-intro {\r\n  margin: 0 0 30px;\r\n  color: #344856;\r\n  font-size: 18px;\r\n  line-height: 1.7;\r\n}\r\n\r\n.leeyee-dual-ats-article .lee-lead {\r\n  color: #304452;\r\n  font-size: 18px;\r\n  line-height: 1.7;\r\n}\r\n\r\n.leeyee-dual-ats-article .lee-label {\r\n  display: inline-flex;\r\n  align-items: center;\r\n  min-height: 28px;\r\n  margin: 0 0 12px;\r\n  padding: 5px 10px;\r\n  border-radius: 999px;\r\n  background: #e2effb;\r\n  color: var(--lee-blue);\r\n  font-size: 12px;\r\n  font-weight: 800;\r\n  line-height: 1.2;\r\n  letter-spacing: .05em;\r\n  text-transform: uppercase;\r\n}\r\n\r\n.leeyee-dual-ats-article .lee-quick,\r\n.leeyee-dual-ats-article .lee-note,\r\n.leeyee-dual-ats-article .lee-warning,\r\n.leeyee-dual-ats-article .lee-checklist,\r\n.leeyee-dual-ats-article .lee-cta {\r\n  border-radius: 14px;\r\n}\r\n\r\n.leeyee-dual-ats-article .lee-quick {\r\n  margin: 28px 0 42px;\r\n  padding: 26px;\r\n  background: var(--lee-blue-softer);\r\n  border: 1px solid #cfe0ee;\r\n  box-shadow: 0 8px 24px rgba(0, 72, 152, .055);\r\n}\r\n\r\n.leeyee-dual-ats-article .lee-quick h2,\r\n.leeyee-dual-ats-article .lee-checklist h2 {\r\n  margin-top: 0;\r\n}\r\n\r\n.leeyee-dual-ats-article .lee-table-note {\r\n  margin: -4px 0 14px;\r\n  color: var(--lee-muted);\r\n  font-size: 14px;\r\n  line-height: 1.55;\r\n}\r\n\r\n.leeyee-dual-ats-article .lee-table-wrap {\r\n  width: 100%;\r\n  margin: 20px 0 14px;\r\n}\r\n\r\n.leeyee-dual-ats-article 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  border: 1px solid var(--lee-line);\r\n  border-radius: 12px;\r\n  background: #fff;\r\n  font-size: 15px;\r\n  line-height: 1.48;\r\n}\r\n\r\n.leeyee-dual-ats-article thead th {\r\n  padding: 13px 14px;\r\n  background: var(--lee-blue);\r\n  color: #fff;\r\n  text-align: left;\r\n  vertical-align: top;\r\n  font-weight: 800;\r\n}\r\n\r\n.leeyee-dual-ats-article tbody th,\r\n.leeyee-dual-ats-article tbody td {\r\n  padding: 13px 14px;\r\n  border-top: 1px solid var(--lee-line);\r\n  vertical-align: top;\r\n  text-align: left;\r\n}\r\n\r\n.leeyee-dual-ats-article tbody th {\r\n  background: #fbfdff;\r\n  color: var(--lee-heading);\r\n  font-weight: 750;\r\n}\r\n\r\n.leeyee-dual-ats-article tbody tr:first-child th,\r\n.leeyee-dual-ats-article tbody tr:first-child td {\r\n  border-top: 0;\r\n}\r\n\r\n.leeyee-dual-ats-article .lee-buyer {\r\n  margin: 20px 0 0;\r\n  padding: 15px 17px;\r\n  background: #fff;\r\n  border-left: 4px solid var(--lee-blue);\r\n  color: #2d414f;\r\n}\r\n\r\n.leeyee-dual-ats-article .lee-note {\r\n  margin: 22px 0;\r\n  padding: 18px 20px;\r\n  background: var(--lee-blue-softer);\r\n  border: 1px solid #d5e5f1;\r\n}\r\n\r\n.leeyee-dual-ats-article .lee-warning {\r\n  margin: 25px 0;\r\n  padding: 18px 20px;\r\n  background: var(--lee-warn-bg);\r\n  border: 1px solid #ecd8a9;\r\n  border-left: 4px solid var(--lee-warn-line);\r\n}\r\n\r\n.leeyee-dual-ats-article .lee-warning strong {\r\n  color: #6b4a0d;\r\n}\r\n\r\n\/* Stable image layout for Impreza + WPBakery.\r\n   No 100vw, translateX or viewport breakout. *\/\r\n.leeyee-dual-ats-article .lee-figure {\r\n  display: block;\r\n  width: 100%;\r\n  max-width: 100%;\r\n  margin: 28px auto 34px;\r\n  padding: 0;\r\n}\r\n\r\n.leeyee-dual-ats-article .lee-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  padding: 0;\r\n  object-fit: contain;\r\n  border: 1px solid #dce6ee;\r\n  border-radius: 14px;\r\n  background: #fff;\r\n  box-shadow: 0 8px 24px rgba(24, 51, 72, .07);\r\n}\r\n\r\n.leeyee-dual-ats-article figcaption {\r\n  display: block;\r\n  width: 100%;\r\n  max-width: 780px;\r\n  margin: 10px auto 0;\r\n  padding: 0 8px;\r\n  color: var(--lee-muted);\r\n  font-size: 13px;\r\n  line-height: 1.55;\r\n  text-align: center;\r\n}\r\n\r\n.leeyee-dual-ats-article .lee-source-grid {\r\n  display: grid;\r\n  grid-template-columns: repeat(2, minmax(0, 1fr));\r\n  gap: 16px;\r\n  margin: 20px 0 28px;\r\n}\r\n\r\n.leeyee-dual-ats-article .lee-source-card {\r\n  padding: 18px 19px;\r\n  border: 1px solid var(--lee-line);\r\n  border-radius: 12px;\r\n  background: #fff;\r\n}\r\n\r\n.leeyee-dual-ats-article .lee-source-card strong {\r\n  display: block;\r\n  margin-bottom: 6px;\r\n  font-size: 16px;\r\n}\r\n\r\n.leeyee-dual-ats-article .lee-source-card p {\r\n  margin: 0;\r\n  font-size: 15px;\r\n  line-height: 1.58;\r\n}\r\n\r\n.leeyee-dual-ats-article .lee-steps {\r\n  counter-reset: lee-step;\r\n  display: grid;\r\n  gap: 12px;\r\n  margin: 22px 0 30px;\r\n  padding: 0;\r\n  list-style: none;\r\n}\r\n\r\n.leeyee-dual-ats-article .lee-steps li {\r\n  counter-increment: lee-step;\r\n  position: relative;\r\n  min-height: 56px;\r\n  margin: 0;\r\n  padding: 13px 16px 13px 58px;\r\n  border: 1px solid var(--lee-line);\r\n  border-radius: 11px;\r\n  background: #fff;\r\n}\r\n\r\n.leeyee-dual-ats-article .lee-steps li::before {\r\n  content: counter(lee-step);\r\n  position: absolute;\r\n  left: 14px;\r\n  top: 12px;\r\n  display: grid;\r\n  place-items: center;\r\n  width: 30px;\r\n  height: 30px;\r\n  border-radius: 50%;\r\n  background: var(--lee-blue);\r\n  color: #fff;\r\n  font-size: 14px;\r\n  font-weight: 800;\r\n}\r\n\r\n.leeyee-dual-ats-article .lee-checklist {\r\n  margin: 30px 0;\r\n  padding: 24px;\r\n  background: var(--lee-blue-softer);\r\n  border: 1px solid #d0e1ef;\r\n}\r\n\r\n.leeyee-dual-ats-article .lee-checklist ul {\r\n  display: grid;\r\n  grid-template-columns: repeat(2, minmax(0, 1fr));\r\n  gap: 9px 22px;\r\n  margin: 18px 0 0;\r\n  padding: 0;\r\n  list-style: none;\r\n}\r\n\r\n.leeyee-dual-ats-article .lee-checklist li {\r\n  position: relative;\r\n  margin: 0;\r\n  padding-left: 25px;\r\n}\r\n\r\n.leeyee-dual-ats-article .lee-checklist li::before {\r\n  content: \"\u2713\";\r\n  position: absolute;\r\n  left: 0;\r\n  top: 0;\r\n  color: var(--lee-blue);\r\n  font-weight: 900;\r\n}\r\n\r\n.leeyee-dual-ats-article .lee-cta {\r\n  margin: 28px 0 38px;\r\n  padding: 24px;\r\n  background: #fff;\r\n  border: 1px solid #cddfec;\r\n  box-shadow: 0 8px 24px rgba(0, 72, 152, .07);\r\n}\r\n\r\n.leeyee-dual-ats-article .lee-cta h3 {\r\n  margin: 0 0 8px;\r\n  font-size: 24px;\r\n}\r\n\r\n.leeyee-dual-ats-article .lee-cta p {\r\n  margin: 0 0 17px;\r\n}\r\n\r\n.leeyee-dual-ats-article .leeyee-about-btn-light {\r\n  -webkit-appearance: none;\r\n  appearance: none;\r\n  display: inline-flex;\r\n  align-items: center;\r\n  justify-content: center;\r\n  min-height: 50px;\r\n  max-width: 100%;\r\n  margin: 0;\r\n  padding: 12px 24px;\r\n  border: 2px solid #004898;\r\n  border-radius: 10px;\r\n  background: #fff;\r\n  color: #004898;\r\n  font: inherit;\r\n  font-size: 15px;\r\n  font-weight: 700;\r\n  line-height: 1.2;\r\n  text-align: center;\r\n  cursor: pointer;\r\n  box-shadow: 0 5px 14px rgba(0, 72, 152, .11);\r\n  transition:\r\n    background-color .18s ease,\r\n    color .18s ease,\r\n    transform .18s ease,\r\n    box-shadow .18s ease;\r\n}\r\n\r\n.leeyee-dual-ats-article .leeyee-about-btn-light:hover {\r\n  background: #004898;\r\n  color: #fff;\r\n  transform: translateY(-1px);\r\n  box-shadow: 0 8px 18px rgba(0, 72, 152, .17);\r\n}\r\n\r\n.leeyee-dual-ats-article .leeyee-about-btn-light:focus-visible {\r\n  outline: 3px solid rgba(0, 72, 152, .3);\r\n  outline-offset: 3px;\r\n}\r\n\r\n.leeyee-dual-ats-article .leeyee-about-btn-light:active {\r\n  transform: translateY(0);\r\n}\r\n\r\n.leeyee-dual-ats-article .w-btn-label {\r\n  display: inline-block;\r\n}\r\n\r\n.leeyee-dual-ats-article .lee-faq {\r\n  margin-top: 24px;\r\n  border-top: 1px solid var(--lee-line);\r\n}\r\n\r\n.leeyee-dual-ats-article .lee-faq-item {\r\n  padding: 22px 0;\r\n  border-bottom: 1px solid var(--lee-line);\r\n}\r\n\r\n.leeyee-dual-ats-article .lee-faq-item h3 {\r\n  margin: 0 0 9px;\r\n  font-size: 20px;\r\n  line-height: 1.35;\r\n}\r\n\r\n.leeyee-dual-ats-article .lee-faq-item p {\r\n  margin-bottom: 0;\r\n}\r\n\r\n.leeyee-dual-ats-article sup {\r\n  line-height: 0;\r\n}\r\n\r\n.leeyee-dual-ats-article sup a {\r\n  font-size: 11px;\r\n  font-weight: 800;\r\n  text-decoration: none;\r\n}\r\n\r\n.leeyee-dual-ats-article .lee-references {\r\n  margin-top: 54px;\r\n  padding-top: 4px;\r\n  border-top: 2px solid var(--lee-line);\r\n}\r\n\r\n.leeyee-dual-ats-article .lee-references h2 {\r\n  margin-top: 36px;\r\n}\r\n\r\n.leeyee-dual-ats-article .lee-references ol {\r\n  margin: 0;\r\n  padding-left: 24px;\r\n}\r\n\r\n.leeyee-dual-ats-article .lee-references li {\r\n  margin: 0 0 14px;\r\n  padding-left: 4px;\r\n  color: #445866;\r\n  font-size: 14px;\r\n  line-height: 1.62;\r\n}\r\n\r\n.leeyee-dual-ats-article .lee-references a {\r\n  font-weight: 650;\r\n  word-break: break-word;\r\n}\r\n\r\n.leeyee-dual-ats-article .lee-visually-hidden {\r\n  position: absolute !important;\r\n  width: 1px !important;\r\n  height: 1px !important;\r\n  margin: -1px !important;\r\n  padding: 0 !important;\r\n  overflow: hidden !important;\r\n  clip: rect(0, 0, 0, 0) !important;\r\n  white-space: nowrap !important;\r\n  border: 0 !important;\r\n}\r\n\r\n@media (max-width: 820px) {\r\n  .leeyee-dual-ats-article {\r\n    padding-left: 18px;\r\n    padding-right: 18px;\r\n  }\r\n\r\n  .leeyee-dual-ats-article .lee-source-grid {\r\n    grid-template-columns: 1fr;\r\n  }\r\n\r\n  .leeyee-dual-ats-article .lee-figure {\r\n    width: 100%;\r\n    max-width: 100%;\r\n    margin-left: auto;\r\n    margin-right: auto;\r\n  }\r\n}\r\n\r\n@media (max-width: 768px) {\r\n  .leeyee-dual-ats-article {\r\n    font-size: 16px;\r\n  }\r\n\r\n  .leeyee-dual-ats-article .lee-intro,\r\n  .leeyee-dual-ats-article .lee-lead {\r\n    font-size: 17px;\r\n  }\r\n}\r\n\r\n@media (max-width: 600px) {\r\n  .leeyee-dual-ats-article {\r\n    padding: 4px 16px 58px;\r\n    line-height: 1.68;\r\n  }\r\n\r\n  .leeyee-dual-ats-article h2 {\r\n    margin-top: 42px;\r\n  }\r\n\r\n  .leeyee-dual-ats-article h3 {\r\n    margin-top: 28px;\r\n  }\r\n\r\n  .leeyee-dual-ats-article .lee-quick,\r\n  .leeyee-dual-ats-article .lee-checklist,\r\n  .leeyee-dual-ats-article .lee-cta {\r\n    padding: 20px;\r\n  }\r\n\r\n  .leeyee-dual-ats-article .lee-figure {\r\n    margin-top: 22px;\r\n    margin-bottom: 28px;\r\n  }\r\n\r\n  .leeyee-dual-ats-article .lee-figure img {\r\n    border-radius: 10px;\r\n  }\r\n\r\n  .leeyee-dual-ats-article figcaption {\r\n    padding: 0 4px;\r\n    font-size: 12.5px;\r\n  }\r\n\r\n  .leeyee-dual-ats-article table,\r\n  .leeyee-dual-ats-article thead,\r\n  .leeyee-dual-ats-article tbody,\r\n  .leeyee-dual-ats-article tr,\r\n  .leeyee-dual-ats-article th,\r\n  .leeyee-dual-ats-article td {\r\n    display: block;\r\n    width: 100%;\r\n  }\r\n\r\n  .leeyee-dual-ats-article table {\r\n    border: 0;\r\n    background: transparent;\r\n  }\r\n\r\n  .leeyee-dual-ats-article 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  }\r\n\r\n  .leeyee-dual-ats-article tbody tr {\r\n    margin: 0 0 12px;\r\n    overflow: hidden;\r\n    border: 1px solid var(--lee-line);\r\n    border-radius: 10px;\r\n    background: #fff;\r\n  }\r\n\r\n  .leeyee-dual-ats-article tbody th,\r\n  .leeyee-dual-ats-article tbody td,\r\n  .leeyee-dual-ats-article tbody tr:first-child th,\r\n  .leeyee-dual-ats-article tbody tr:first-child td {\r\n    display: grid;\r\n    grid-template-columns: minmax(110px, 38%) 1fr;\r\n    gap: 10px;\r\n    padding: 11px 12px;\r\n    border-top: 1px solid var(--lee-line);\r\n    background: #fff;\r\n  }\r\n\r\n  .leeyee-dual-ats-article tbody th:first-child,\r\n  .leeyee-dual-ats-article tbody td:first-child {\r\n    border-top: 0;\r\n  }\r\n\r\n  .leeyee-dual-ats-article tbody th::before,\r\n  .leeyee-dual-ats-article tbody td::before {\r\n    content: attr(data-label);\r\n    color: var(--lee-blue-dark);\r\n    font-size: 12px;\r\n    font-weight: 800;\r\n    line-height: 1.45;\r\n  }\r\n\r\n  .leeyee-dual-ats-article .lee-checklist ul {\r\n    grid-template-columns: 1fr;\r\n  }\r\n}\r\n\r\n@media (max-width: 480px) {\r\n  .leeyee-dual-ats-article {\r\n    padding-left: 14px;\r\n    padding-right: 14px;\r\n  }\r\n\r\n  .leeyee-dual-ats-article .lee-quick,\r\n  .leeyee-dual-ats-article .lee-note,\r\n  .leeyee-dual-ats-article .lee-warning,\r\n  .leeyee-dual-ats-article .lee-checklist,\r\n  .leeyee-dual-ats-article .lee-cta {\r\n    border-radius: 11px;\r\n  }\r\n\r\n  .leeyee-dual-ats-article tbody th,\r\n  .leeyee-dual-ats-article tbody td,\r\n  .leeyee-dual-ats-article tbody tr:first-child th,\r\n  .leeyee-dual-ats-article tbody tr:first-child td {\r\n    grid-template-columns: 1fr;\r\n    gap: 4px;\r\n  }\r\n\r\n  .leeyee-dual-ats-article .leeyee-about-btn-light {\r\n    width: 100%;\r\n    min-height: 50px;\r\n    padding-left: 18px;\r\n    padding-right: 18px;\r\n  }\r\n}\r\n\r\n@media (max-width: 390px) {\r\n  .leeyee-dual-ats-article {\r\n    padding-left: 13px;\r\n    padding-right: 13px;\r\n  }\r\n\r\n  .leeyee-dual-ats-article .lee-quick,\r\n  .leeyee-dual-ats-article .lee-checklist,\r\n  .leeyee-dual-ats-article .lee-cta {\r\n    padding: 18px;\r\n  }\r\n}\r\n\r\n@media (max-width: 360px) {\r\n  .leeyee-dual-ats-article {\r\n    padding-left: 12px;\r\n    padding-right: 12px;\r\n  }\r\n\r\n  .leeyee-dual-ats-article .lee-steps li {\r\n    padding-right: 12px;\r\n  }\r\n}\r\n<\/style>\r\n\r\n<div class=\"leeyee-dual-ats-article\" id=\"leeyee-dual-power-ats-guide\">\r\n\r\n  <p class=\"lee-kicker\">Dual-Source ATS Selection for B2B Projects<\/p>\r\n\r\n  <div class=\"lee-intro\">\r\n    <p>A <strong>dual power automatic transfer switch<\/strong> transfers a load between two alternative power sources. But \u201cdual power\u201d alone is not enough to specify the correct ATS. For a real panel, generator or OEM project, the source pair, neutral arrangement, pole count, electrical ratings, controller logic, load duty and short-circuit coordination all affect the final configuration.<sup><a href=\"#ref-1\">[1]<\/a><\/sup><\/p>\r\n\r\n    <p>This guide is for panel builders, distributors, electrical contractors, generator integrators and OEM buyers who need to convert a two-source requirement into a usable ATS specification\u2014not simply understand what an automatic transfer switch is.<\/p>\r\n  <\/div>\r\n\r\n  <section class=\"lee-quick\" aria-labelledby=\"lee-quick-heading\">\r\n    <span class=\"lee-label\">Quick Answer<\/span>\r\n    <div id=\"ez-toc-container\" class=\"ez-toc-v2_0_87 counter-hierarchy ez-toc-counter ez-toc-custom ez-toc-container-direction\">\n<div class=\"ez-toc-title-container\">\n<p class=\"ez-toc-title\" style=\"cursor:inherit\">Table of Contents<\/p>\n<span class=\"ez-toc-title-toggle\"><\/span><\/div>\n<nav><ul class='ez-toc-list ez-toc-list-level-1 ' ><li class='ez-toc-page-1 ez-toc-heading-level-2'><a class=\"ez-toc-link ez-toc-heading-1\" href=\"#\" data-href=\"https:\/\/www.cnspd.com\/id\/dual-power-automatic-transfer-switch\/#how-should-you-select-a-dual-power-automatic-transfer-switch\" >How Should You Select a Dual Power Automatic Transfer Switch?<\/a><\/li><li class='ez-toc-page-1 ez-toc-heading-level-2'><a class=\"ez-toc-link ez-toc-heading-2\" href=\"#\" data-href=\"https:\/\/www.cnspd.com\/id\/dual-power-automatic-transfer-switch\/#what-does-%e2%80%9cdual-power%e2%80%9d-mean-in-an-ats\" >What Does \u201cDual Power\u201d Mean in an ATS?<\/a><\/li><li class='ez-toc-page-1 ez-toc-heading-level-2'><a class=\"ez-toc-link ez-toc-heading-3\" href=\"#\" data-href=\"https:\/\/www.cnspd.com\/id\/dual-power-automatic-transfer-switch\/#start-with-the-source-pair-utility%e2%80%93utility-or-utility%e2%80%93generator\" >Start With the Source Pair: Utility\u2013Utility or Utility\u2013Generator?<\/a><\/li><li class='ez-toc-page-1 ez-toc-heading-level-2'><a class=\"ez-toc-link ez-toc-heading-4\" href=\"#\" data-href=\"https:\/\/www.cnspd.com\/id\/dual-power-automatic-transfer-switch\/#how-do-you-choose-2p-3p-or-4p\" >How Do You Choose 2P, 3P or 4P?<\/a><\/li><li class='ez-toc-page-1 ez-toc-heading-level-2'><a class=\"ez-toc-link ez-toc-heading-5\" href=\"#\" data-href=\"https:\/\/www.cnspd.com\/id\/dual-power-automatic-transfer-switch\/#rated-current-matters-but-it-is-not-the-whole-ats-specification\" >Rated Current Matters, but It Is Not the Whole ATS Specification<\/a><\/li><li class='ez-toc-page-1 ez-toc-heading-level-2'><a class=\"ez-toc-link ez-toc-heading-6\" href=\"#\" data-href=\"https:\/\/www.cnspd.com\/id\/dual-power-automatic-transfer-switch\/#pc-class-or-cb-class-why-does-it-matter\" >PC Class or CB Class: Why Does It Matter?<\/a><\/li><li class='ez-toc-page-1 ez-toc-heading-level-2'><a class=\"ez-toc-link ez-toc-heading-7\" href=\"#\" data-href=\"https:\/\/www.cnspd.com\/id\/dual-power-automatic-transfer-switch\/#which-controller-functions-should-you-confirm\" >Which Controller Functions Should You Confirm?<\/a><\/li><li class='ez-toc-page-1 ez-toc-heading-level-2'><a class=\"ez-toc-link ez-toc-heading-8\" href=\"#\" data-href=\"https:\/\/www.cnspd.com\/id\/dual-power-automatic-transfer-switch\/#what-does-a-typical-utility%e2%80%93generator-transfer-sequence-look-like\" >What Does a Typical Utility\u2013Generator Transfer Sequence Look Like?<\/a><\/li><li class='ez-toc-page-1 ez-toc-heading-level-2'><a class=\"ez-toc-link ez-toc-heading-9\" href=\"#\" data-href=\"https:\/\/www.cnspd.com\/id\/dual-power-automatic-transfer-switch\/#automatic-mode-and-manual-operation-are-different-requirements\" >Automatic Mode and Manual Operation Are Different Requirements<\/a><\/li><li class='ez-toc-page-1 ez-toc-heading-level-2'><a class=\"ez-toc-link ez-toc-heading-10\" href=\"#\" data-href=\"https:\/\/www.cnspd.com\/id\/dual-power-automatic-transfer-switch\/#common-ordering-mistakes-that-lead-to-the-wrong-ats\" >Common Ordering Mistakes That Lead to the Wrong ATS<\/a><\/li><li class='ez-toc-page-1 ez-toc-heading-level-2'><a class=\"ez-toc-link ez-toc-heading-11\" href=\"#\" data-href=\"https:\/\/www.cnspd.com\/id\/dual-power-automatic-transfer-switch\/#which-standards-and-documents-should-a-b2b-buyer-verify\" >Which Standards and Documents Should a B2B Buyer Verify?<\/a><\/li><li class='ez-toc-page-1 ez-toc-heading-level-2'><a class=\"ez-toc-link ez-toc-heading-12\" href=\"#\" data-href=\"https:\/\/www.cnspd.com\/id\/dual-power-automatic-transfer-switch\/#a-practical-dual-power-ats-selection-sequence\" >A Practical Dual Power ATS Selection Sequence<\/a><\/li><li class='ez-toc-page-1 ez-toc-heading-level-2'><a class=\"ez-toc-link ez-toc-heading-13\" href=\"#\" data-href=\"https:\/\/www.cnspd.com\/id\/dual-power-automatic-transfer-switch\/#dual-power-ats-rfq-checklist\" >Dual Power ATS RFQ Checklist<\/a><\/li><li class='ez-toc-page-1 ez-toc-heading-level-2'><a class=\"ez-toc-link ez-toc-heading-14\" href=\"#\" data-href=\"https:\/\/www.cnspd.com\/id\/dual-power-automatic-transfer-switch\/#frequently-asked-procurement-questions\" >Frequently Asked Procurement Questions<\/a><\/li><li class='ez-toc-page-1 ez-toc-heading-level-2'><a class=\"ez-toc-link ez-toc-heading-15\" href=\"#\" data-href=\"https:\/\/www.cnspd.com\/id\/dual-power-automatic-transfer-switch\/#references\" >References<\/a><\/li><\/ul><\/nav><\/div>\n<h2 id=\"lee-quick-heading\"><span class=\"ez-toc-section\" id=\"how-should-you-select-a-dual-power-automatic-transfer-switch\"><\/span>How Should You Select a Dual Power Automatic Transfer Switch?<span class=\"ez-toc-section-end\"><\/span><\/h2>\r\n\r\n    <p class=\"lee-lead\"><strong>Start with the two power sources, not the ampere rating.<\/strong> A utility\u2013utility system and a utility\u2013generator system can use the same basic transfer concept, but they may require different source-priority logic, neutral treatment, controller functions and transfer sequences.<\/p>\r\n\r\n    <p class=\"lee-table-note\">The items below are the core decisions a buyer should clarify before fixing the ATS model.<\/p>\r\n\r\n    <div class=\"lee-table-wrap\">\r\n      <table>\r\n        <caption class=\"lee-visually-hidden\">Key decisions when selecting a dual power automatic transfer switch<\/caption>\r\n        <thead>\r\n          <tr>\r\n            <th style=\"width:29%\">Confirm First<\/th>\r\n            <th style=\"width:30%\">Typical Options<\/th>\r\n            <th>Why It Changes Selection<\/th>\r\n          <\/tr>\r\n        <\/thead>\r\n        <tbody>\r\n          <tr>\r\n            <th scope=\"row\" data-label=\"Confirm First\">Source pair<\/th>\r\n            <td data-label=\"Typical Options\">Utility\u2013utility; utility\u2013generator; other approved AC source combinations<\/td>\r\n            <td data-label=\"Why It Matters\">Changes source priority, failure logic, return logic and control interfaces<\/td>\r\n          <\/tr>\r\n          <tr>\r\n            <th scope=\"row\" data-label=\"Confirm First\">Electrical system<\/th>\r\n            <td data-label=\"Typical Options\">Single-phase or three-phase<\/td>\r\n            <td data-label=\"Why It Matters\">Affects voltage arrangement and pole selection<\/td>\r\n          <\/tr>\r\n          <tr>\r\n            <th scope=\"row\" data-label=\"Confirm First\">Neutral treatment<\/th>\r\n            <td data-label=\"Typical Options\">Solid neutral or switched neutral<\/td>\r\n            <td data-label=\"Why It Matters\">Must match the source, grounding arrangement and project design<\/td>\r\n          <\/tr>\r\n          <tr>\r\n            <th scope=\"row\" data-label=\"Confirm First\">Poles<\/th>\r\n            <td data-label=\"Typical Options\">2P, 3P or 4P<\/td>\r\n            <td data-label=\"Why It Matters\">Defines which circuit conductors are transferred<\/td>\r\n          <\/tr>\r\n          <tr>\r\n            <th scope=\"row\" data-label=\"Confirm First\">Ratings<\/th>\r\n            <td data-label=\"Typical Options\">Voltage, frequency, current and load duty<\/td>\r\n            <td data-label=\"Why It Matters\">Must match the actual electrical system and application<\/td>\r\n          <\/tr>\r\n          <tr>\r\n            <th scope=\"row\" data-label=\"Confirm First\">ATS architecture<\/th>\r\n            <td data-label=\"Typical Options\">PC Class or CB Class where applicable<\/td>\r\n            <td data-label=\"Why It Matters\">Changes the switching and short-circuit protection arrangement<\/td>\r\n          <\/tr>\r\n          <tr>\r\n            <th scope=\"row\" data-label=\"Confirm First\">Controller logic<\/th>\r\n            <td data-label=\"Typical Options\">Priority, delays, generator start and status I\/O<\/td>\r\n            <td data-label=\"Why It Matters\">Determines how the system behaves before, during and after transfer<\/td>\r\n          <\/tr>\r\n          <tr>\r\n            <th scope=\"row\" data-label=\"Confirm First\">Project documents<\/th>\r\n            <td data-label=\"Typical Options\">Applicable standard, datasheet, certificate or test-report scope<\/td>\r\n            <td data-label=\"Why It Matters\">Compliance must be verified for the exact project and model<\/td>\r\n          <\/tr>\r\n        <\/tbody>\r\n      <\/table>\r\n    <\/div>\r\n\r\n    <p class=\"lee-buyer\"><strong>Buyer meaning:<\/strong> \u201cI need a 400 A dual power ATS\u201d is not a complete RFQ. Add the source types, voltage, phase, neutral requirement, poles, load type, controller logic and project-document requirements before comparing quotations.<\/p>\r\n  <\/section>\r\n\r\n  <h2><span class=\"ez-toc-section\" id=\"what-does-%e2%80%9cdual-power%e2%80%9d-mean-in-an-ats\"><\/span>What Does \u201cDual Power\u201d Mean in an ATS?<span class=\"ez-toc-section-end\"><\/span><\/h2>\r\n\r\n  <p>IEC 60947-6-1:2026 covers transfer switching equipment used to transfer a load between power supply sources, including automatic transfer switching equipment and stand-alone ATS controllers within its scope.<sup><a href=\"#ref-1\">[1]<\/a><\/sup> In procurement language, \u201cdual power\u201d emphasizes that the system has two alternative sources available to the load.<\/p>\r\n\r\n  <p>The important issue is not whether the sources are called Source I, Source II, normal, preferred, alternate or standby. The project needs to define <strong>which source normally supplies the load, what makes that source unacceptable, when the alternate source is allowed to take over and what happens after the preferred source returns<\/strong>.<\/p>\r\n\r\n  <h3>Is a Dual Power ATS Different From a Standard ATS?<\/h3>\r\n\r\n  <p>In many supplier catalogues and search queries, <strong>dual power ATS<\/strong> and <strong>automatic transfer switch<\/strong> describe the same basic two-source transfer function. \u201cDual power\u201d is not enough by itself to identify a unique electrical configuration.<\/p>\r\n\r\n  <p>For B2B selection, compare the actual source pair, poles, neutral treatment, transfer-switch class, controller logic, electrical ratings and short-circuit coordination rather than relying on the product name alone.<\/p>\r\n\r\n  <div class=\"lee-source-grid\" aria-label=\"Common dual power ATS source combinations\">\r\n    <div class=\"lee-source-card\">\r\n      <strong>Utility \u2192 Utility<\/strong>\r\n      <p>Two mains or feeder sources. The main decisions are source priority, source-acceptance criteria, transfer delay and retransfer logic.<\/p>\r\n    <\/div>\r\n\r\n    <div class=\"lee-source-card\">\r\n      <strong>Utility \u2192 Generator<\/strong>\r\n      <p>The standby source may need to be started and confirmed stable before the load can be transferred.<\/p>\r\n    <\/div>\r\n  <\/div>\r\n\r\n  <h2><span class=\"ez-toc-section\" id=\"start-with-the-source-pair-utility%e2%80%93utility-or-utility%e2%80%93generator\"><\/span>Start With the Source Pair: Utility\u2013Utility or Utility\u2013Generator?<span class=\"ez-toc-section-end\"><\/span><\/h2>\r\n\r\n  <h3>Utility\u2013Utility: Define Source Priority and Return Logic<\/h3>\r\n\r\n  <p>In a utility\u2013utility arrangement, both incoming sources may already be energized. The project should therefore define which source is preferred, what voltage or frequency conditions make it unacceptable, whether a transfer delay is required and whether the load should automatically return after the preferred source becomes acceptable again.<\/p>\r\n\r\n  <p>Available priority modes and monitoring functions depend on the selected controller. They must be checked in the actual ATS\/controller documentation rather than assumed from the words \u201cdual power.\u201d<\/p>\r\n\r\n  <figure class=\"lee-figure\">\r\n    <img loading=\"lazy\"\r\n      src=\"https:\/\/www.cnspd.com\/wp-content\/uploads\/2026\/09\/dual-power-ats-utility-utility-architecture.webp\"\r\n      width=\"1448\"\r\n      height=\"1086\"\r\n      loading=\"lazy\"\r\n      decoding=\"async\"\r\n      alt=\"Dual power automatic transfer switch architecture for two utility power sources\">\r\n    <figcaption>Utility\u2013utility concept: two alternative utility sources feed one ATS and one load. Final priority, acceptance and protection settings must be confirmed for the actual project.<\/figcaption>\r\n  <\/figure>\r\n\r\n  <h3>Utility\u2013Generator: Confirm the Generator Interface and Transfer Sequence<\/h3>\r\n\r\n  <p>A utility\u2013generator system normally involves more than switching the power contacts. Depending on the controller and generator system, the sequence can include utility-failure detection, a generator-start command, source-acceptance checks, transfer delay, retransfer delay and generator stop or cool-down logic.<sup><a href=\"#ref-5\">[5]<\/a><\/sup><\/p>\r\n\r\n  <p>Do not assume every automatic transfer switch provides every generator-control function. Confirm the controller outputs, generator-start interface, sensing functions, timers and generator-controller requirements before approving the model.<\/p>\r\n\r\n  <figure class=\"lee-figure\">\r\n    <img loading=\"lazy\"\r\n      src=\"https:\/\/www.cnspd.com\/wp-content\/uploads\/2026\/09\/dual-power-ats-utility-generator-architecture.webp\"\r\n      width=\"1448\"\r\n      height=\"1086\"\r\n      loading=\"lazy\"\r\n      decoding=\"async\"\r\n      alt=\"Dual power automatic transfer switch architecture for utility and standby generator power sources\">\r\n    <figcaption>Utility\u2013generator architecture: the ATS monitors the available sources and may interface with the generator controller. The exact start, transfer and return sequence is model- and project-specific.<\/figcaption>\r\n  <\/figure>\r\n\r\n  <div class=\"lee-note\">\r\n    <strong>LEEYEE product scope:<\/strong> The compact ATS format used by LEEYEE fits the dual-source selection logic discussed on this page, including common grid\/generator applications. However, the exact electrical ratings, controller functions, generator interface, auxiliary contacts and available options must be confirmed from the selected model specification.\r\n  <\/div>\r\n\r\n  <div class=\"lee-note\">\r\n    <strong>Other alternative sources:<\/strong> An inverter, UPS-backed source or another AC source may also form part of a two-source system. Do not automatically reuse generator control logic. Verify output characteristics, neutral and grounding arrangement, permitted switching behaviour and the source-equipment manufacturer's instructions.\r\n  <\/div>\r\n\r\n  <h2><span class=\"ez-toc-section\" id=\"how-do-you-choose-2p-3p-or-4p\"><\/span>How Do You Choose 2P, 3P or 4P?<span class=\"ez-toc-section-end\"><\/span><\/h2>\r\n\r\n  <p>Pole count should follow the conductors that must be transferred. It should not be selected from phase count alone.<\/p>\r\n\r\n  <div class=\"lee-table-wrap\">\r\n    <table>\r\n      <caption class=\"lee-visually-hidden\">How to interpret 2 pole, 3 pole and 4 pole ATS configurations<\/caption>\r\n      <thead>\r\n        <tr>\r\n          <th style=\"width:20%\">Configuration<\/th>\r\n          <th style=\"width:32%\">Typical Interpretation<\/th>\r\n          <th>What the Buyer Must Confirm<\/th>\r\n        <\/tr>\r\n      <\/thead>\r\n      <tbody>\r\n        <tr>\r\n          <th scope=\"row\" data-label=\"Configuration\">2P<\/th>\r\n          <td data-label=\"Typical Interpretation\">Commonly used where two conductors of a single-phase circuit are transferred<\/td>\r\n          <td data-label=\"Buyer Check\">Whether neutral must be switched and what the approved project wiring requires<\/td>\r\n        <\/tr>\r\n        <tr>\r\n          <th scope=\"row\" data-label=\"Configuration\">3P<\/th>\r\n          <td data-label=\"Typical Interpretation\">Three phase conductors are switched while neutral, if present, remains outside the transfer poles<\/td>\r\n          <td data-label=\"Buyer Check\">Whether a solid neutral is suitable for the source and grounding arrangement<\/td>\r\n        <\/tr>\r\n        <tr>\r\n          <th scope=\"row\" data-label=\"Configuration\">4P<\/th>\r\n          <td data-label=\"Typical Interpretation\">Three phase conductors and neutral are switched<\/td>\r\n          <td data-label=\"Buyer Check\">Whether switched neutral is required by the source, grounding design and project rules<\/td>\r\n        <\/tr>\r\n      <\/tbody>\r\n    <\/table>\r\n  <\/div>\r\n\r\n  <p>ASCO's transfer-switch guidance distinguishes solid and switched neutral configurations and explains that selection depends on the electrical distribution and whether the alternative source uses a separately derived ground.<sup><a href=\"#ref-2\">[2]<\/a><\/sup> That is why a simple rule such as \u201cthree phase always means 4P\u201d is not technically reliable.<\/p>\r\n\r\n  <figure class=\"lee-figure\">\r\n    <img loading=\"lazy\"\r\n      src=\"https:\/\/www.cnspd.com\/wp-content\/uploads\/2026\/09\/four-pole-ats-neutral-switching-diagram.webp\"\r\n      width=\"1448\"\r\n      height=\"1086\"\r\n      loading=\"lazy\"\r\n      decoding=\"async\"\r\n      alt=\"Four-pole automatic transfer switch diagram showing switched neutral in a three-phase system\">\r\n    <figcaption>Conceptual 4P arrangement showing a switched neutral. This is a selection diagram, not a field wiring instruction; final neutral and grounding treatment must follow the approved project design.<\/figcaption>\r\n  <\/figure>\r\n\r\n  <div class=\"lee-warning\">\r\n    <strong>Engineering boundary:<\/strong> Do not choose 3P or 4P from the product appearance alone. Confirm the earthing system, source neutral bonding, separately derived source conditions where applicable, local requirements and the approved single-line diagram before final selection.<sup><a href=\"#ref-2\">[2]<\/a><\/sup>\r\n  <\/div>\r\n\r\n  <h2><span class=\"ez-toc-section\" id=\"rated-current-matters-but-it-is-not-the-whole-ats-specification\"><\/span>Rated Current Matters, but It Is Not the Whole ATS Specification<span class=\"ez-toc-section-end\"><\/span><\/h2>\r\n\r\n  <p>The ATS rated current must suit the circuit design, but increasing the ampere rating does not correct an unsuitable source arrangement, pole configuration, controller or short-circuit coordination strategy.<\/p>\r\n\r\n  <p>For procurement, confirm the rated operational voltage, frequency, current, load duty and the manufacturer's short-circuit performance data together with the upstream protective device and available fault level. These items need to be evaluated as a system rather than as isolated catalogue numbers.<sup><a href=\"#ref-3\">[3]<\/a><\/sup><\/p>\r\n\r\n  <div class=\"lee-note\">\r\n    <strong>For motors and high-inrush loads:<\/strong> provide the load type and starting characteristics instead of only the steady-state current. The selected ATS and protection arrangement should be confirmed against the real duty of the application.\r\n  <\/div>\r\n\r\n  <h2><span class=\"ez-toc-section\" id=\"pc-class-or-cb-class-why-does-it-matter\"><\/span>PC Class or CB Class: Why Does It Matter?<span class=\"ez-toc-section-end\"><\/span><\/h2>\r\n\r\n  <p>IEC-based transfer-switch projects may distinguish between different equipment classes and short-circuit performance arrangements. ABB's ATS selection guidance discusses Class PC and Class CB architectures as part of ATS selection and short-circuit performance evaluation.<sup><a href=\"#ref-3\">[3]<\/a><\/sup><\/p>\r\n\r\n  <p>For the buyer, the practical question is not simply \u201cWhich class is better?\u201d It is <strong>how the switching equipment, upstream protective device and available fault level are coordinated for the actual panel<\/strong>.<\/p>\r\n\r\n  <p>If the tender, single-line diagram or panel specification already defines PC Class or CB Class, follow that requirement and verify the selected model accordingly. If it does not, provide the supplier with the protection arrangement and project fault information for technical review.<\/p>\r\n\r\n  <div class=\"lee-note\">\r\n    <strong>Product boundary:<\/strong> Do not identify PC Class or CB Class only from the appearance of a compact ATS. The exact classification and short-circuit data must be confirmed from the selected model's technical documentation.\r\n  <\/div>\r\n\r\n  <h2><span class=\"ez-toc-section\" id=\"which-controller-functions-should-you-confirm\"><\/span>Which Controller Functions Should You Confirm?<span class=\"ez-toc-section-end\"><\/span><\/h2>\r\n\r\n  <p>The controller determines much of the real behaviour of a dual power automatic transfer switch. Depending on the selected model, relevant functions can include source-voltage monitoring, frequency monitoring, phase-condition monitoring, source priority, transfer delay, retransfer delay, generator-start output, status contacts, alarm outputs and remote-control functions.<\/p>\r\n\r\n  <p><strong>These are procurement items to confirm, not a statement that every compact LEEYEE ATS includes every function.<\/strong> Check the exact controller datasheet and I\/O list before fixing the model, particularly where a tender requires generator control, remote indication, communication or a specific source-return sequence.<\/p>\r\n\r\n  <figure class=\"lee-figure\">\r\n    <img loading=\"lazy\"\r\n      src=\"https:\/\/www.cnspd.com\/wp-content\/uploads\/2026\/09\/dual-power-ats-controller-functions.webp\"\r\n      width=\"1448\"\r\n      height=\"1086\"\r\n      loading=\"lazy\"\r\n      decoding=\"async\"\r\n      alt=\"Dual power ATS controller functions including source monitoring transfer delay and generator start signal\">\r\n    <figcaption>Controller functions that may need to be confirmed during ATS selection. This graphic is a procurement checklist; availability depends on the selected ATS and controller configuration.<\/figcaption>\r\n  <\/figure>\r\n\r\n  <h2><span class=\"ez-toc-section\" id=\"what-does-a-typical-utility%e2%80%93generator-transfer-sequence-look-like\"><\/span>What Does a Typical Utility\u2013Generator Transfer Sequence Look Like?<span class=\"ez-toc-section-end\"><\/span><\/h2>\r\n\r\n  <p>A typical utility\u2013generator application can move through source-failure detection, generator start, source acceptance, load transfer, utility return, retransfer and generator stop or cool-down. The actual sequence and timer values are not universal and should be taken from the selected ATS controller and generator documentation.<sup><a href=\"#ref-5\">[5]<\/a><\/sup><\/p>\r\n\r\n  <figure class=\"lee-figure\">\r\n    <img loading=\"lazy\"\r\n      src=\"https:\/\/www.cnspd.com\/wp-content\/uploads\/2026\/09\/utility-generator-ats-transfer-sequence.webp\"\r\n      width=\"1448\"\r\n      height=\"1086\"\r\n      loading=\"lazy\"\r\n      decoding=\"async\"\r\n      alt=\"Automatic transfer switch sequence from utility failure to generator transfer and retransfer\">\r\n    <figcaption>Conceptual utility\u2013generator operating sequence. Do not use this diagram to assign fixed timer values; controller settings must be confirmed for the actual generator and ATS model.<\/figcaption>\r\n  <\/figure>\r\n\r\n  <div class=\"lee-warning\">\r\n    <strong>Transition-mode boundary:<\/strong> This page is focused on conventional dual-source ATS selection. The compact LEEYEE ATS discussed here should not be treated as evidence of closed-transition capability. If a project requires closed transition, intentional source overlap or another special transfer sequence, treat it as a separate engineering requirement and verify suitable equipment. IEC 60947-6-1:2026 includes specific requirements for ATSE with closed-transition capability in Annex D.<sup><a href=\"#ref-1\">[1]<\/a><\/sup>\r\n  <\/div>\r\n\r\n  <h2><span class=\"ez-toc-section\" id=\"automatic-mode-and-manual-operation-are-different-requirements\"><\/span>Automatic Mode and Manual Operation Are Different Requirements<span class=\"ez-toc-section-end\"><\/span><\/h2>\r\n\r\n  <p>Compact dual-power ATS products may provide both automatic operation and a local manual operating method. These two functions should be evaluated separately.<\/p>\r\n\r\n  <p>Automatic mode allows the controller to evaluate source conditions and execute the configured transfer sequence. Manual operation provides a local method of operating the switching mechanism, but the permitted procedure and operating conditions depend on the specific ATS design.<\/p>\r\n\r\n  <p>For procurement, ask two separate questions: <strong>What does the ATS perform automatically?<\/strong> and <strong>How is the switching mechanism operated locally when automatic control is intentionally unavailable?<\/strong><\/p>\r\n\r\n  <p>Do not assume that an \u201cAuto\/Manual\u201d marking defines the complete electrical-isolation or maintenance procedure. Those procedures must follow the equipment documentation and the approved project safety rules.<\/p>\r\n\r\n  <h2><span class=\"ez-toc-section\" id=\"common-ordering-mistakes-that-lead-to-the-wrong-ats\"><\/span>Common Ordering Mistakes That Lead to the Wrong ATS<span class=\"ez-toc-section-end\"><\/span><\/h2>\r\n\r\n  <div class=\"lee-table-wrap\">\r\n    <table>\r\n      <caption class=\"lee-visually-hidden\">Common dual power ATS ordering mistakes and better RFQ information<\/caption>\r\n      <thead>\r\n        <tr>\r\n          <th style=\"width:34%\">Incomplete Request<\/th>\r\n          <th>What Is Missing<\/th>\r\n          <th style=\"width:29%\">Better Approach<\/th>\r\n        <\/tr>\r\n      <\/thead>\r\n      <tbody>\r\n        <tr>\r\n          <th scope=\"row\" data-label=\"Incomplete Request\">\u201cNeed 400 A ATS\u201d<\/th>\r\n          <td data-label=\"What Is Missing\">Source pair, voltage, poles, neutral, load duty and controller logic<\/td>\r\n          <td data-label=\"Better Approach\">Send the full electrical and source configuration<\/td>\r\n        <\/tr>\r\n        <tr>\r\n          <th scope=\"row\" data-label=\"Incomplete Request\">\u201cThree phase, so 4P\u201d<\/th>\r\n          <td data-label=\"What Is Missing\">Neutral and grounding decision<\/td>\r\n          <td data-label=\"Better Approach\">Provide the single-line diagram and earthing arrangement<\/td>\r\n        <\/tr>\r\n        <tr>\r\n          <th scope=\"row\" data-label=\"Incomplete Request\">\u201cGenerator ATS; automatic is enough\u201d<\/th>\r\n          <td data-label=\"What Is Missing\">Generator-start interface, sensing and transfer\/retransfer logic<\/td>\r\n          <td data-label=\"Better Approach\">Define the required generator operating sequence<\/td>\r\n        <\/tr>\r\n        <tr>\r\n          <th scope=\"row\" data-label=\"Incomplete Request\">\u201cIEC compliant\u201d<\/th>\r\n          <td data-label=\"What Is Missing\">Standard edition, exact model and required certificate\/report scope<\/td>\r\n          <td data-label=\"Better Approach\">State the project requirement and required evidence<\/td>\r\n        <\/tr>\r\n      <\/tbody>\r\n    <\/table>\r\n  <\/div>\r\n\r\n  <h2><span class=\"ez-toc-section\" id=\"which-standards-and-documents-should-a-b2b-buyer-verify\"><\/span>Which Standards and Documents Should a B2B Buyer Verify?<span class=\"ez-toc-section-end\"><\/span><\/h2>\r\n\r\n  <p>IEC published <strong>IEC 60947-6-1:2026, Edition 4.0<\/strong> on 2 April 2026. It applies to transfer switching equipment for transferring a load between power supply sources and covers ATSE, including the controller, as well as stand-alone ATS controllers and several defined transfer-switch variants.<sup><a href=\"#ref-1\">[1]<\/a><\/sup><\/p>\r\n\r\n  <p>The 2026 fourth edition cancels and replaces the third edition published in 2021.<sup><a href=\"#ref-1\">[1]<\/a><\/sup> However, publication of a new IEC edition does not mean that every existing product, certificate or project specification automatically moves to the new edition.<\/p>\r\n\r\n  <p>For project approval, verify the exact model designation, rating, applicable standard edition and the scope of any certificate or test report. If a tender or approved drawing cites a specific edition, confirm the contractual requirement before substituting another edition.<\/p>\r\n\r\n  <p>For North American projects, UL Solutions lists multiple transfer-switch categories evaluated to <strong>UL 1008<\/strong>, including automatic transfer switches for emergency systems, automatic transfer switches for optional standby systems and nonautomatic transfer switches.<sup><a href=\"#ref-4\">[4]<\/a><\/sup> The required listing and installation rules should therefore be checked for the actual application rather than inferred from IEC documentation.<\/p>\r\n\r\n  <div class=\"lee-note\">\r\n    <strong>Document-verification rule:<\/strong> \u201cDesigned to IEC 60947-6-1\u201d is not the same as proving that a specific certificate or report covers every current rating, pole configuration or OEM-labelled variant. Ask for model-specific documentation where project approval requires it.\r\n  <\/div>\r\n\r\n  <h2><span class=\"ez-toc-section\" id=\"a-practical-dual-power-ats-selection-sequence\"><\/span>A Practical Dual Power ATS Selection Sequence<span class=\"ez-toc-section-end\"><\/span><\/h2>\r\n\r\n  <ol class=\"lee-steps\">\r\n    <li><strong>Define Source I and Source II.<\/strong> Identify whether each source is utility, generator or another approved AC source.<\/li>\r\n    <li><strong>Define source priority.<\/strong> State which source normally supplies the load and what should happen after it returns.<\/li>\r\n    <li><strong>Confirm voltage, frequency and phase.<\/strong> Use the actual project electrical system.<\/li>\r\n    <li><strong>Confirm neutral treatment.<\/strong> Decide solid or switched neutral from the approved source and grounding arrangement.<\/li>\r\n    <li><strong>Confirm 2P, 3P or 4P.<\/strong> Pole count follows the conductors that must be transferred.<\/li>\r\n    <li><strong>Confirm current and load duty.<\/strong> Include motor or high-inrush information where relevant.<\/li>\r\n    <li><strong>Confirm ATS class and short-circuit coordination.<\/strong> Check the upstream protective device and available fault information.<\/li>\r\n    <li><strong>Define controller functions.<\/strong> Include only the priority, timers, generator interface, status contacts and remote signals required by the project and supported by the selected model.<\/li>\r\n    <li><strong>Verify project documents.<\/strong> Confirm the exact model, standard and evidence required before final approval.<\/li>\r\n  <\/ol>\r\n\r\n  <section class=\"lee-checklist\" aria-labelledby=\"lee-rfq-heading\">\r\n    <span class=\"lee-label\">Before Ordering<\/span>\r\n    <h2 id=\"lee-rfq-heading\"><span class=\"ez-toc-section\" id=\"dual-power-ats-rfq-checklist\"><\/span>Dual Power ATS RFQ Checklist<span class=\"ez-toc-section-end\"><\/span><\/h2>\r\n\r\n    <p>Send these details before requesting a final model recommendation. A complete RFQ makes quotations easier to compare on the same technical basis.<\/p>\r\n\r\n    <ul>\r\n      <li>Source I type<\/li>\r\n      <li>Source II type<\/li>\r\n      <li>Preferred source \/ priority logic<\/li>\r\n      <li>Rated system voltage<\/li>\r\n      <li>Frequency<\/li>\r\n      <li>Single-phase or three-phase<\/li>\r\n      <li>Design \/ load current<\/li>\r\n      <li>2P \/ 3P \/ 4P requirement<\/li>\r\n      <li>Neutral and earthing arrangement<\/li>\r\n      <li>Load type and inrush information<\/li>\r\n      <li>PC Class \/ CB Class requirement if specified<\/li>\r\n      <li>Transfer and retransfer logic<\/li>\r\n      <li>Generator-start interface if required<\/li>\r\n      <li>Auxiliary contacts \/ remote signals if required<\/li>\r\n      <li>Upstream protective device<\/li>\r\n      <li>Available fault information where required<\/li>\r\n      <li>Applicable standard and documents<\/li>\r\n      <li>Quantity<\/li>\r\n      <li>OEM label requirement<\/li>\r\n      <li>OEM packaging requirement<\/li>\r\n    <\/ul>\r\n  <\/section>\r\n\r\n  <section class=\"lee-cta\" aria-label=\"Dual power ATS configuration enquiry\">\r\n    <h3>Need help confirming the dual-power ATS configuration?<\/h3>\r\n\r\n    <p>Send the two source types, system voltage, current, phase, pole requirement, neutral arrangement, load type and required control logic. LEEYEE can review the configuration information before model confirmation.<\/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=\"Send Your ATS Requirements\">\r\n      <span class=\"w-btn-label\">Send Your ATS Requirements<\/span>\r\n    <\/button>\r\n  <\/section>\r\n\r\n  <h2><span class=\"ez-toc-section\" id=\"frequently-asked-procurement-questions\"><\/span>Frequently Asked Procurement Questions<span class=\"ez-toc-section-end\"><\/span><\/h2>\r\n\r\n  <div class=\"lee-faq\">\r\n\r\n    <div class=\"lee-faq-item\">\r\n      <h3>Is a dual power automatic transfer switch different from a normal ATS?<\/h3>\r\n      <p>Not necessarily. \u201cDual power ATS\u201d is commonly used to emphasize that the load can transfer between two power sources. The name alone does not define poles, current, neutral arrangement, ATS class or controller functions.<\/p>\r\n    <\/div>\r\n\r\n    <div class=\"lee-faq-item\">\r\n      <h3>Can the same ATS be used for utility\u2013utility and utility\u2013generator systems?<\/h3>\r\n      <p>Possibly, but this should not be assumed. The power-switching device may be suitable while the controller or I\/O configuration is not. A utility\u2013generator application can require generator-start control, source-acceptance logic and timer functions that are unnecessary in a basic utility\u2013utility arrangement.<\/p>\r\n    <\/div>\r\n\r\n    <div class=\"lee-faq-item\">\r\n      <h3>Should a three-phase dual power ATS be 3P or 4P?<\/h3>\r\n      <p>There is no universal answer based only on the words \u201cthree phase.\u201d The decision depends on whether neutral must be switched and on the source, grounding and neutral arrangement of the project.<sup><a href=\"#ref-2\">[2]<\/a><\/sup><\/p>\r\n    <\/div>\r\n\r\n    <div class=\"lee-faq-item\">\r\n      <h3>Does every compact ATS support all controller functions listed in this guide?<\/h3>\r\n      <p>No. Monitoring, timing, generator control, auxiliary contacts, alarms, communication and remote functions depend on the exact ATS and controller configuration. Confirm them from the selected model documentation before ordering.<\/p>\r\n    <\/div>\r\n\r\n    <div class=\"lee-faq-item\">\r\n      <h3>Does a dual power ATS automatically start a generator?<\/h3>\r\n      <p>Only when the selected ATS\/controller and generator-control system provide and use the required interface. Confirm the generator-start contact or control signal, source sensing and controller logic for the exact equipment.<\/p>\r\n    <\/div>\r\n\r\n    <div class=\"lee-faq-item\">\r\n      <h3>Can a dual power ATS also be operated manually?<\/h3>\r\n      <p>Many compact ATS designs provide a manual operating method. The permitted procedure and operating conditions still depend on the specific model and manufacturer instructions.<\/p>\r\n    <\/div>\r\n\r\n    <div class=\"lee-faq-item\">\r\n      <h3>Is a higher-current ATS always a safer choice?<\/h3>\r\n      <p>No. The current rating must suit the circuit, but a larger ampere rating does not correct the wrong neutral treatment, controller logic, load duty or protection coordination.<\/p>\r\n    <\/div>\r\n\r\n    <div class=\"lee-faq-item\">\r\n      <h3>What is the difference between PC Class and CB Class ATS?<\/h3>\r\n      <p>The classes relate to transfer-switch architecture and short-circuit\/protection arrangements. Do not identify the class from product appearance alone. Verify the selected model documentation and evaluate it with the upstream protective device, fault level and project specification.<sup><a href=\"#ref-3\">[3]<\/a><\/sup><\/p>\r\n    <\/div>\r\n\r\n    <div class=\"lee-faq-item\">\r\n      <h3>What information is required for an accurate dual power ATS quotation?<\/h3>\r\n      <p>Send the two source types, voltage, frequency, phase, design current, neutral and earthing arrangement, poles, load type, source priority, required controller functions, protection information, project documents, quantity and OEM requirements.<\/p>\r\n    <\/div>\r\n\r\n  <\/div>\r\n\r\n  <section class=\"lee-cta\" aria-label=\"ATS model recommendation enquiry\">\r\n    <h3>Turn your two-source requirement into a model-ready specification<\/h3>\r\n\r\n    <p>A clear specification reduces technical back-and-forth and makes supplier quotations easier to compare. Share the project parameters when you are ready to confirm the ATS configuration.<\/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 Configuration Review\">\r\n      <span class=\"w-btn-label\">Request ATS Configuration Review<\/span>\r\n    <\/button>\r\n  <\/section>\r\n\r\n  <section class=\"lee-references\" aria-labelledby=\"lee-references-heading\">\r\n    <h2 id=\"lee-references-heading\"><span class=\"ez-toc-section\" id=\"references\"><\/span>References<span class=\"ez-toc-section-end\"><\/span><\/h2>\r\n\r\n    <ol>\r\n      <li id=\"ref-1\">\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        Edition 4.0, published 2 April 2026.\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-2\">\r\n        <strong>Schneider Electric \/ ASCO Power Technologies.<\/strong>\r\n        <em>Neutral Configurations in Transfer Switches.<\/em>\r\n        Data Bulletin ASC-DB-NCTS, Version 1.0, 2 August 2024.\r\n        <a href=\"https:\/\/www.se.com\/us\/en\/download\/document\/ASC-DB-NCTS\/\" target=\"_blank\" rel=\"noopener noreferrer\">Official Schneider Electric \/ ASCO document 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 White Paper, document 1SCC303022C0201.\r\n        <a href=\"https:\/\/library.e.abb.com\/public\/a0a6a4a06b204e7bbf5988e6d35ee364\/ATS%20white%20paper_1SCC303022C0201_20-09.pdf\" target=\"_blank\" rel=\"noopener noreferrer\">ABB technical white paper<\/a>.\r\n      <\/li>\r\n\r\n      <li id=\"ref-4\">\r\n        <strong>UL Solutions.<\/strong>\r\n        <em>Switch Certification and Evaluation Services.<\/em>\r\n        Includes transfer-switch categories evaluated to UL 1008.\r\n        <a href=\"https:\/\/www.ul.com\/services\/switch-certification-and-evaluation-services\" target=\"_blank\" rel=\"noopener noreferrer\">Official UL Solutions page<\/a>.\r\n      <\/li>\r\n\r\n      <li id=\"ref-5\">\r\n        <strong>Schneider Electric \/ ASCO Power Technologies.<\/strong>\r\n        <em>Timing Delays for ATS Transition Modes.<\/em>\r\n        White Paper ASC-TS-WP-123-TD-ATS, 13 October 2020.\r\n        <a href=\"https:\/\/www.se.com\/us\/en\/download\/document\/ASC-TS-WP-123-TD-ATS\/\" target=\"_blank\" rel=\"noopener noreferrer\">Official Schneider Electric \/ ASCO document page<\/a>.\r\n      <\/li>\r\n    <\/ol>\r\n  <\/section>\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<\/div>\t\t\t\t<\/div>\n\t\t\t\t<\/div>\n\t\t\t\t\t<\/div>\n\t\t\t\t<\/div>\n\t\t\t\t<\/div>\n\t\t","protected":false},"excerpt":{"rendered":"<p>Dual-Source ATS Selection for B2B Projects A dual power automatic transfer switch transfers a load between two alternative power sources. But \u201cdual power\u201d alone is not enough to specify the correct ATS. For a real panel, generator or OEM project, the source pair, neutral arrangement, pole count, electrical ratings, controller logic, load duty and short-circuit&#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-31246","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>Dual Power Automatic Transfer Switch Guide | LEEYEE<\/title>\n<meta name=\"description\" content=\"Select a dual power automatic transfer switch by source pair, 2P\/3P\/4P, neutral arrangement, controller logic, current, load and project requirements.\" \/>\n<meta name=\"robots\" content=\"index, follow, max-snippet:-1, max-image-preview:large, max-video-preview:-1\" \/>\n<link rel=\"canonical\" href=\"https:\/\/www.cnspd.com\/id\/dual-power-automatic-transfer-switch\/\" \/>\n<meta property=\"og:locale\" content=\"id_ID\" \/>\n<meta property=\"og:type\" content=\"article\" \/>\n<meta property=\"og:title\" content=\"Dual Power Automatic Transfer Switch Guide | LEEYEE\" \/>\n<meta property=\"og:description\" content=\"Select a dual power automatic transfer switch by source pair, 2P\/3P\/4P, neutral arrangement, controller logic, current, load and project requirements.\" \/>\n<meta property=\"og:url\" content=\"https:\/\/www.cnspd.com\/id\/dual-power-automatic-transfer-switch\/\" \/>\n<meta property=\"og:site_name\" content=\"Surge Protector, Surge Arrestor, Isolating Switch - 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