{"id":31264,"date":"2026-09-22T14:26:15","date_gmt":"2026-09-22T06:26:15","guid":{"rendered":"https:\/\/www.cnspd.com\/?p=31264"},"modified":"2026-09-22T14:26:43","modified_gmt":"2026-09-22T06:26:43","slug":"contactor-type-ats-vs-switch-type-ats-differences-and-selection-guide","status":"publish","type":"post","link":"https:\/\/www.cnspd.com\/it\/contactor-type-ats-vs-switch-type-ats\/","title":{"rendered":"Contactor Type ATS vs Switch Type ATS: Differences and Selection Guide"},"content":{"rendered":"\t\t<div data-elementor-type=\"wp-post\" data-elementor-id=\"31264\" class=\"elementor elementor-31264\" data-elementor-post-type=\"post\">\n\t\t\t\t<div class=\"elementor-element elementor-element-0615c2e e-flex e-con-boxed e-con e-parent\" data-id=\"0615c2e\" 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-1194be8 elementor-widget elementor-widget-html\" data-id=\"1194be8\" data-element_type=\"widget\" data-e-type=\"widget\" data-widget_type=\"html.default\">\n\t\t\t\t<div class=\"elementor-widget-container\">\n\t\t\t\t\t<style>\r\n  .leeyee-ats-article,\r\n  .leeyee-ats-article * {\r\n    box-sizing: border-box;\r\n  }\r\n\r\n  .leeyee-ats-article {\r\n    --leeyee-blue: #004898;\r\n    --leeyee-blue-dark: #00376f;\r\n    --leeyee-blue-soft: #eef5ff;\r\n    --leeyee-blue-soft-2: #f7fbff;\r\n    --leeyee-text: #263442;\r\n    --leeyee-heading: #152536;\r\n    --leeyee-muted: #637383;\r\n    --leeyee-line: #dce6ee;\r\n    --leeyee-line-dark: #c7d6e2;\r\n    --leeyee-warning-bg: #fff8ec;\r\n    --leeyee-warning-line: #dfbb72;\r\n    width: 100%;\r\n    max-width: 860px;\r\n    margin: 0 auto;\r\n    padding: 8px 22px 50px;\r\n    color: var(--leeyee-text);\r\n    font-size: 17px;\r\n    line-height: 1.72;\r\n    overflow-wrap: anywhere;\r\n  }\r\n\r\n  .leeyee-ats-article p {\r\n    margin: 0 0 18px;\r\n  }\r\n\r\n  .leeyee-ats-article a {\r\n    color: var(--leeyee-blue);\r\n    text-decoration-thickness: 1px;\r\n    text-underline-offset: 3px;\r\n  }\r\n\r\n  .leeyee-ats-article a:hover {\r\n    color: var(--leeyee-blue-dark);\r\n  }\r\n\r\n  .leeyee-ats-article h2,\r\n  .leeyee-ats-article h3 {\r\n    color: var(--leeyee-heading);\r\n    font-weight: 760;\r\n    line-height: 1.25;\r\n    letter-spacing: -0.02em;\r\n  }\r\n\r\n  .leeyee-ats-article h2 {\r\n    margin: 52px 0 20px;\r\n    font-size: clamp(28px, 3vw, 33px);\r\n  }\r\n\r\n  .leeyee-ats-article h3 {\r\n    margin: 34px 0 14px;\r\n    font-size: clamp(21px, 2.4vw, 25px);\r\n  }\r\n\r\n  .leeyee-ats-article strong {\r\n    color: #172b3d;\r\n    font-weight: 720;\r\n  }\r\n\r\n  .leeyee-ats-article .leeyee-intro {\r\n    margin: 0 0 26px;\r\n    color: #314253;\r\n    font-size: 18px;\r\n    line-height: 1.72;\r\n  }\r\n\r\n  .leeyee-ats-article .leeyee-quick-answer {\r\n    margin: 26px 0 34px;\r\n    padding: 25px 27px;\r\n    border: 1px solid #bcd3e8;\r\n    border-left: 5px solid var(--leeyee-blue);\r\n    border-radius: 12px;\r\n    background: var(--leeyee-blue-soft-2);\r\n    box-shadow: 0 5px 18px rgba(22, 61, 91, 0.06);\r\n  }\r\n\r\n  .leeyee-ats-article .leeyee-quick-answer-label,\r\n  .leeyee-ats-article .leeyee-note-title,\r\n  .leeyee-ats-article .leeyee-buyer-title,\r\n  .leeyee-ats-article .leeyee-product-label {\r\n    display: inline-block;\r\n    margin-bottom: 9px;\r\n    color: var(--leeyee-blue);\r\n    font-size: 13px;\r\n    font-weight: 800;\r\n    line-height: 1.2;\r\n    letter-spacing: 0.07em;\r\n    text-transform: uppercase;\r\n  }\r\n\r\n  .leeyee-ats-article .leeyee-quick-answer p:last-child,\r\n  .leeyee-ats-article .leeyee-note p:last-child,\r\n  .leeyee-ats-article .leeyee-warning p:last-child,\r\n  .leeyee-ats-article .leeyee-buyer-meaning p:last-child,\r\n  .leeyee-ats-article .leeyee-product-scope p:last-child,\r\n  .leeyee-ats-article .leeyee-cta-box p:last-child {\r\n    margin-bottom: 0;\r\n  }\r\n\r\n  .leeyee-ats-article .leeyee-key-line {\r\n    margin: 22px 0;\r\n    padding: 16px 19px;\r\n    border-left: 4px solid var(--leeyee-blue);\r\n    background: #f8fafc;\r\n    color: #27394a;\r\n    font-weight: 650;\r\n  }\r\n\r\n  .leeyee-ats-article .leeyee-table-wrap {\r\n    width: 100%;\r\n    margin: 20px 0 14px;\r\n  }\r\n\r\n  .leeyee-ats-article table {\r\n    width: 100%;\r\n    margin: 0;\r\n    border-collapse: separate;\r\n    border-spacing: 0;\r\n    overflow: hidden;\r\n    border: 1px solid var(--leeyee-line-dark);\r\n    border-radius: 10px;\r\n    background: #fff;\r\n    font-size: 15.5px;\r\n    line-height: 1.5;\r\n  }\r\n\r\n  .leeyee-ats-article thead th {\r\n    padding: 14px 15px;\r\n    border-right: 1px solid rgba(255,255,255,0.18);\r\n    background: var(--leeyee-blue);\r\n    color: #fff;\r\n    text-align: left;\r\n    vertical-align: top;\r\n    font-weight: 720;\r\n  }\r\n\r\n  .leeyee-ats-article thead th:last-child {\r\n    border-right: 0;\r\n  }\r\n\r\n  .leeyee-ats-article tbody th,\r\n  .leeyee-ats-article tbody td {\r\n    padding: 13px 15px;\r\n    border-right: 1px solid var(--leeyee-line);\r\n    border-bottom: 1px solid var(--leeyee-line);\r\n    text-align: left;\r\n    vertical-align: top;\r\n  }\r\n\r\n  .leeyee-ats-article tbody th {\r\n    width: 26%;\r\n    background: #f8fbfd;\r\n    color: #1e3346;\r\n    font-weight: 700;\r\n  }\r\n\r\n  .leeyee-ats-article tbody td {\r\n    width: 37%;\r\n  }\r\n\r\n  .leeyee-ats-article tbody tr:last-child th,\r\n  .leeyee-ats-article tbody tr:last-child td {\r\n    border-bottom: 0;\r\n  }\r\n\r\n  .leeyee-ats-article tbody td:last-child,\r\n  .leeyee-ats-article tbody th:last-child {\r\n    border-right: 0;\r\n  }\r\n\r\n  .leeyee-ats-article .leeyee-table-note {\r\n    margin: 10px 2px 0;\r\n    color: var(--leeyee-muted);\r\n    font-size: 14.5px;\r\n    line-height: 1.55;\r\n  }\r\n\r\n  .leeyee-ats-article .leeyee-figure {\r\n    margin: 30px 0 34px;\r\n  }\r\n\r\n  .leeyee-ats-article .leeyee-figure img {\r\n    display: block;\r\n    width: 100%;\r\n    height: auto;\r\n    aspect-ratio: 4 \/ 3;\r\n    object-fit: contain;\r\n    border: 1px solid var(--leeyee-line);\r\n    border-radius: 12px;\r\n    background: #fff;\r\n  }\r\n\r\n  .leeyee-ats-article .leeyee-figure figcaption {\r\n    margin-top: 10px;\r\n    padding: 0 3px;\r\n    color: var(--leeyee-muted);\r\n    font-size: 14px;\r\n    line-height: 1.55;\r\n  }\r\n\r\n  .leeyee-ats-article .leeyee-note,\r\n  .leeyee-ats-article .leeyee-buyer-meaning {\r\n    margin: 22px 0;\r\n    padding: 18px 20px;\r\n    border: 1px solid #c8dbea;\r\n    border-radius: 10px;\r\n    background: var(--leeyee-blue-soft);\r\n  }\r\n\r\n  .leeyee-ats-article .leeyee-product-scope {\r\n    margin: 28px 0 34px;\r\n    padding: 22px 24px;\r\n    border: 1px solid #b7d0e5;\r\n    border-top: 4px solid var(--leeyee-blue);\r\n    border-radius: 11px;\r\n    background: #fff;\r\n    box-shadow: 0 5px 16px rgba(0,72,152,0.055);\r\n  }\r\n\r\n  .leeyee-ats-article .leeyee-product-scope h3 {\r\n    margin: 0 0 12px;\r\n    font-size: 23px;\r\n  }\r\n\r\n  .leeyee-ats-article .leeyee-product-points {\r\n    display: grid;\r\n    grid-template-columns: repeat(2,minmax(0,1fr));\r\n    gap: 9px 22px;\r\n    margin: 18px 0 4px;\r\n  }\r\n\r\n  .leeyee-ats-article .leeyee-product-point {\r\n    position: relative;\r\n    padding-left: 24px;\r\n  }\r\n\r\n  .leeyee-ats-article .leeyee-product-point::before {\r\n    content: \"\u2713\";\r\n    position: absolute;\r\n    left: 0;\r\n    top: 0;\r\n    color: var(--leeyee-blue);\r\n    font-weight: 800;\r\n  }\r\n\r\n  .leeyee-ats-article .leeyee-warning {\r\n    margin: 24px 0;\r\n    padding: 19px 21px;\r\n    border: 1px solid var(--leeyee-warning-line);\r\n    border-left: 5px solid #c27a0a;\r\n    border-radius: 10px;\r\n    background: var(--leeyee-warning-bg);\r\n  }\r\n\r\n  .leeyee-ats-article .leeyee-warning strong {\r\n    color: #704300;\r\n  }\r\n\r\n  .leeyee-ats-article ul,\r\n  .leeyee-ats-article ol {\r\n    margin: 12px 0 22px;\r\n    padding-left: 24px;\r\n  }\r\n\r\n  .leeyee-ats-article li {\r\n    margin: 7px 0;\r\n  }\r\n\r\n  .leeyee-ats-article .leeyee-choice-grid {\r\n    display: grid;\r\n    grid-template-columns: repeat(2,minmax(0,1fr));\r\n    gap: 18px;\r\n    margin: 22px 0 28px;\r\n  }\r\n\r\n  .leeyee-ats-article .leeyee-choice-card {\r\n    padding: 21px 22px;\r\n    border: 1px solid #c9d9e6;\r\n    border-radius: 11px;\r\n    background: #fff;\r\n  }\r\n\r\n  .leeyee-ats-article .leeyee-choice-card h3 {\r\n    margin: 0 0 12px;\r\n    color: var(--leeyee-blue);\r\n    font-size: 21px;\r\n  }\r\n\r\n  .leeyee-ats-article .leeyee-choice-card ul {\r\n    margin: 0;\r\n    padding-left: 20px;\r\n  }\r\n\r\n  .leeyee-ats-article .leeyee-choice-card li {\r\n    margin: 8px 0;\r\n  }\r\n\r\n  .leeyee-ats-article .leeyee-steps {\r\n    margin: 22px 0 28px;\r\n    padding: 0;\r\n    list-style: none;\r\n    counter-reset: ats-step;\r\n  }\r\n\r\n  .leeyee-ats-article .leeyee-steps li {\r\n    position: relative;\r\n    margin: 0;\r\n    padding: 17px 0 17px 54px;\r\n    border-bottom: 1px solid var(--leeyee-line);\r\n    counter-increment: ats-step;\r\n  }\r\n\r\n  .leeyee-ats-article .leeyee-steps li:last-child {\r\n    border-bottom: 0;\r\n  }\r\n\r\n  .leeyee-ats-article .leeyee-steps li::before {\r\n    content: counter(ats-step);\r\n    position: absolute;\r\n    top: 15px;\r\n    left: 0;\r\n    display: flex;\r\n    width: 34px;\r\n    height: 34px;\r\n    align-items: center;\r\n    justify-content: center;\r\n    border: 1px solid #91b8d9;\r\n    border-radius: 50%;\r\n    background: #f4f9fd;\r\n    color: var(--leeyee-blue);\r\n    font-size: 15px;\r\n    font-weight: 800;\r\n  }\r\n\r\n  .leeyee-ats-article .leeyee-steps strong {\r\n    display: block;\r\n    margin-bottom: 3px;\r\n  }\r\n\r\n  .leeyee-ats-article .leeyee-checklist {\r\n    display: grid;\r\n    grid-template-columns: repeat(2,minmax(0,1fr));\r\n    gap: 10px 24px;\r\n    margin: 20px 0 26px;\r\n    padding: 23px 25px;\r\n    border: 1px solid #c8dbea;\r\n    border-radius: 12px;\r\n    background: #f7fbff;\r\n  }\r\n\r\n  .leeyee-ats-article .leeyee-checkitem {\r\n    position: relative;\r\n    min-height: 28px;\r\n    padding-left: 27px;\r\n    color: #293b4c;\r\n  }\r\n\r\n  .leeyee-ats-article .leeyee-checkitem::before {\r\n    content: \"\u2713\";\r\n    position: absolute;\r\n    left: 0;\r\n    top: 0;\r\n    color: var(--leeyee-blue);\r\n    font-weight: 850;\r\n  }\r\n\r\n  .leeyee-ats-article .leeyee-cta-box {\r\n    margin: 30px 0;\r\n    padding: 25px 27px;\r\n    border: 1px solid #bdd4e7;\r\n    border-radius: 12px;\r\n    background: #fff;\r\n    box-shadow: 0 6px 20px rgba(24,65,96,0.07);\r\n  }\r\n\r\n  .leeyee-ats-article .leeyee-cta-box h3 {\r\n    margin: 0 0 10px;\r\n    font-size: 23px;\r\n  }\r\n\r\n  .leeyee-ats-article .leeyee-cta-actions {\r\n    margin-top: 17px;\r\n  }\r\n\r\n  .leeyee-ats-article .leeyee-about-btn-light {\r\n    -webkit-appearance: none;\r\n    appearance: none;\r\n    display: inline-flex;\r\n    min-height: 50px;\r\n    max-width: 100%;\r\n    align-items: center;\r\n    justify-content: center;\r\n    margin: 0;\r\n    padding: 12px 23px;\r\n    border: 1.5px solid #004898;\r\n    border-radius: 10px;\r\n    background: #fff;\r\n    color: #004898;\r\n    font: inherit;\r\n    font-size: 16px;\r\n    font-weight: 720;\r\n    line-height: 1.25;\r\n    text-align: center;\r\n    text-decoration: none;\r\n    cursor: pointer;\r\n    box-shadow: 0 4px 12px rgba(0,72,152,0.10);\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-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 7px 17px rgba(0,72,152,0.16);\r\n  }\r\n\r\n  .leeyee-ats-article .leeyee-about-btn-light:active {\r\n    transform: translateY(0);\r\n  }\r\n\r\n  .leeyee-ats-article .leeyee-about-btn-light:focus-visible {\r\n    outline: 3px solid rgba(0,72,152,.27);\r\n    outline-offset: 3px;\r\n  }\r\n\r\n  .leeyee-ats-article .leeyee-about-btn-light .w-btn-label {\r\n    display: inline-block;\r\n  }\r\n\r\n  .leeyee-ats-article .leeyee-ref {\r\n    white-space: nowrap;\r\n    font-size: .72em;\r\n    line-height: 1;\r\n    vertical-align: super;\r\n  }\r\n\r\n  .leeyee-ats-article .leeyee-ref a {\r\n    font-weight: 700;\r\n    text-decoration: none;\r\n  }\r\n\r\n  .leeyee-ats-article .leeyee-faq {\r\n    margin: 22px 0 0;\r\n    border-top: 1px solid var(--leeyee-line);\r\n  }\r\n\r\n  .leeyee-ats-article .leeyee-faq details {\r\n    border-bottom: 1px solid var(--leeyee-line);\r\n  }\r\n\r\n  .leeyee-ats-article .leeyee-faq summary {\r\n    position: relative;\r\n    padding: 19px 40px 19px 0;\r\n    color: #1c3143;\r\n    font-weight: 710;\r\n    line-height: 1.45;\r\n    cursor: pointer;\r\n    list-style: none;\r\n  }\r\n\r\n  .leeyee-ats-article .leeyee-faq summary::-webkit-details-marker {\r\n    display: none;\r\n  }\r\n\r\n  .leeyee-ats-article .leeyee-faq summary::after {\r\n    content: \"+\";\r\n    position: absolute;\r\n    right: 3px;\r\n    top: 15px;\r\n    color: var(--leeyee-blue);\r\n    font-size: 25px;\r\n    font-weight: 500;\r\n  }\r\n\r\n  .leeyee-ats-article .leeyee-faq details[open] summary::after {\r\n    content: \"\u2013\";\r\n  }\r\n\r\n  .leeyee-ats-article .leeyee-faq-answer {\r\n    padding: 0 34px 17px 0;\r\n  }\r\n\r\n  .leeyee-ats-article .leeyee-references {\r\n    margin: 18px 0 0;\r\n    padding-left: 22px;\r\n    color: #536575;\r\n    font-size: 14.5px;\r\n    line-height: 1.6;\r\n  }\r\n\r\n  .leeyee-ats-article .leeyee-references li {\r\n    margin: 10px 0;\r\n    padding-left: 3px;\r\n  }\r\n\r\n  .leeyee-ats-article .leeyee-references a {\r\n    word-break: break-word;\r\n  }\r\n\r\n  @media (max-width: 820px) {\r\n    .leeyee-ats-article .leeyee-choice-grid {\r\n      grid-template-columns: 1fr;\r\n    }\r\n\r\n    .leeyee-ats-article .leeyee-product-points {\r\n      grid-template-columns: 1fr;\r\n    }\r\n  }\r\n\r\n  @media (max-width: 768px) {\r\n    .leeyee-ats-article {\r\n      padding-left: 18px;\r\n      padding-right: 18px;\r\n      font-size: 16.5px;\r\n    }\r\n\r\n    .leeyee-ats-article h2 {\r\n      margin-top: 44px;\r\n    }\r\n\r\n    .leeyee-ats-article .leeyee-quick-answer,\r\n    .leeyee-ats-article .leeyee-cta-box,\r\n    .leeyee-ats-article .leeyee-product-scope {\r\n      padding: 21px;\r\n    }\r\n\r\n    .leeyee-ats-article .leeyee-checklist {\r\n      grid-template-columns: 1fr;\r\n      padding: 21px;\r\n    }\r\n  }\r\n\r\n  @media (max-width: 680px) {\r\n    .leeyee-ats-article .leeyee-comparison-table,\r\n    .leeyee-ats-article .leeyee-comparison-table tbody,\r\n    .leeyee-ats-article .leeyee-comparison-table tr,\r\n    .leeyee-ats-article .leeyee-comparison-table th,\r\n    .leeyee-ats-article .leeyee-comparison-table td {\r\n      display: block;\r\n      width: 100%;\r\n    }\r\n\r\n    .leeyee-ats-article .leeyee-comparison-table {\r\n      border: 0;\r\n      border-radius: 0;\r\n      background: transparent;\r\n    }\r\n\r\n    .leeyee-ats-article .leeyee-comparison-table thead {\r\n      display: none;\r\n    }\r\n\r\n    .leeyee-ats-article .leeyee-comparison-table tbody tr {\r\n      margin-bottom: 14px;\r\n      overflow: hidden;\r\n      border: 1px solid var(--leeyee-line-dark);\r\n      border-radius: 10px;\r\n      background: #fff;\r\n    }\r\n\r\n    .leeyee-ats-article .leeyee-comparison-table tbody th,\r\n    .leeyee-ats-article .leeyee-comparison-table tbody td {\r\n      position: relative;\r\n      padding: 12px 14px;\r\n      border-right: 0;\r\n      border-bottom: 1px solid var(--leeyee-line);\r\n    }\r\n\r\n    .leeyee-ats-article .leeyee-comparison-table tbody td::before {\r\n      content: attr(data-label);\r\n      display: block;\r\n      margin-bottom: 4px;\r\n      color: var(--leeyee-blue);\r\n      font-size: 12.5px;\r\n      font-weight: 800;\r\n      letter-spacing: .04em;\r\n      text-transform: uppercase;\r\n    }\r\n\r\n    .leeyee-ats-article .leeyee-comparison-table tbody tr > *:last-child {\r\n      border-bottom: 0;\r\n    }\r\n  }\r\n\r\n  @media (max-width: 480px) {\r\n    .leeyee-ats-article {\r\n      padding-left: 15px;\r\n      padding-right: 15px;\r\n      font-size: 16px;\r\n      line-height: 1.68;\r\n    }\r\n\r\n    .leeyee-ats-article .leeyee-intro {\r\n      font-size: 17px;\r\n    }\r\n\r\n    .leeyee-ats-article h2 {\r\n      font-size: 27px;\r\n    }\r\n\r\n    .leeyee-ats-article h3 {\r\n      font-size: 21px;\r\n    }\r\n\r\n    .leeyee-ats-article .leeyee-quick-answer,\r\n    .leeyee-ats-article .leeyee-note,\r\n    .leeyee-ats-article .leeyee-warning,\r\n    .leeyee-ats-article .leeyee-buyer-meaning,\r\n    .leeyee-ats-article .leeyee-product-scope,\r\n    .leeyee-ats-article .leeyee-cta-box,\r\n    .leeyee-ats-article .leeyee-choice-card {\r\n      padding: 18px;\r\n      border-radius: 9px;\r\n    }\r\n\r\n    .leeyee-ats-article .leeyee-figure {\r\n      margin-top: 24px;\r\n      margin-bottom: 28px;\r\n    }\r\n\r\n    .leeyee-ats-article .leeyee-about-btn-light {\r\n      width: 100%;\r\n      min-height: 50px;\r\n      padding: 12px 17px;\r\n    }\r\n\r\n    .leeyee-ats-article .leeyee-steps li {\r\n      padding-left: 47px;\r\n    }\r\n  }\r\n\r\n  @media (max-width: 360px) {\r\n    .leeyee-ats-article {\r\n      padding-left: 12px;\r\n      padding-right: 12px;\r\n    }\r\n\r\n    .leeyee-ats-article h2 {\r\n      font-size: 25px;\r\n    }\r\n\r\n    .leeyee-ats-article .leeyee-quick-answer,\r\n    .leeyee-ats-article .leeyee-product-scope,\r\n    .leeyee-ats-article .leeyee-cta-box,\r\n    .leeyee-ats-article .leeyee-checklist {\r\n      padding: 16px;\r\n    }\r\n  }\r\n<\/style>\r\n\r\n<article class=\"leeyee-ats-article\" id=\"leeyee-contactor-switch-ats-guide\">\r\n\r\n  <p class=\"leeyee-intro\">\r\n    Choosing between a <strong>contactor type ATS and a switch type ATS<\/strong> is not simply a question of which design is faster, carries more current, or costs less. Both architectures are used in low-voltage source-transfer systems, but they are built differently. For panel builders, generator integrators and OEM buyers, the correct decision depends on switching duty, utilization category, short-circuit conditions, upstream protection, operating endurance, isolation requirements and the design of the complete transfer switching equipment.\r\n  <\/p>\r\n\r\n  <div class=\"leeyee-quick-answer\">\r\n    <span class=\"leeyee-quick-answer-label\">Quick Answer<\/span>\r\n    <p>\r\n      <strong>A contactor-based ATS can be attractive where high operating endurance, relatively fast electromagnetic operation and flexible panel-built control are important.<\/strong> A purpose-built switch-type ATS can be attractive where an integrated change-over mechanism, stable mechanical positions, compact assembly and an isolation function where specifically declared are priorities.\r\n    <\/p>\r\n    <p>\r\n      Neither construction is automatically better for generator backup, industrial panels or high-current systems. Define the electrical requirements first, then select the switching architecture.<sup class=\"leeyee-ref\"><a href=\"#ref-1\">[1]<\/a><\/sup><sup class=\"leeyee-ref\"><a href=\"#ref-2\">[2]<\/a><\/sup>\r\n    <\/p>\r\n  <\/div>\r\n\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\/contactor-type-ats-vs-switch-type-ats\/#contactor-type-ats-vs-switch-type-ats-at-a-glance\" >Contactor Type ATS vs Switch Type ATS at a Glance<\/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\/contactor-type-ats-vs-switch-type-ats\/#how-do-the-two-ats-architectures-actually-differ\" >How Do the Two ATS Architectures Actually Differ?<\/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\/contactor-type-ats-vs-switch-type-ats\/#when-should-you-choose-a-contactor-type-or-switch-type-ats\" >When Should You Choose a Contactor Type or Switch Type ATS?<\/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\/contactor-type-ats-vs-switch-type-ats\/#%e2%80%9ccontactor-type%e2%80%9d-and-%e2%80%9cswitch-type%e2%80%9d-are-not-the-whole-iec-specification\" >\u201cContactor Type\u201d and \u201cSwitch Type\u201d Are Not the Whole IEC Specification<\/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\/contactor-type-ats-vs-switch-type-ats\/#which-ats-type-switches-faster\" >Which ATS Type Switches Faster?<\/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\/contactor-type-ats-vs-switch-type-ats\/#which-type-has-longer-mechanical-and-electrical-life\" >Which Type Has Longer Mechanical and Electrical Life?<\/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\/contactor-type-ats-vs-switch-type-ats\/#mechanical-and-electrical-interlocking-matter\" >Mechanical and Electrical Interlocking Matter<\/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\/contactor-type-ats-vs-switch-type-ats\/#short-circuit-capability-is-more-important-than-the-mechanism-name\" >Short-Circuit Capability Is More Important Than the Mechanism Name<\/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\/contactor-type-ats-vs-switch-type-ats\/#is-switch-type-ats-better-for-high-current-lv-panels\" >Is Switch Type ATS Better for High-Current LV Panels?<\/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\/contactor-type-ats-vs-switch-type-ats\/#which-type-is-better-for-generator-backup\" >Which Type Is Better for Generator Backup?<\/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\/contactor-type-ats-vs-switch-type-ats\/#commercial-building-vs-industrial-application\" >Commercial Building vs Industrial Application<\/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\/contactor-type-ats-vs-switch-type-ats\/#cost-compare-the-complete-installed-system\" >Cost: Compare the Complete Installed System<\/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\/contactor-type-ats-vs-switch-type-ats\/#how-to-choose-between-contactor-type-and-switch-type-ats\" >How to Choose Between Contactor Type and Switch Type ATS<\/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\/contactor-type-ats-vs-switch-type-ats\/#common-selection-mistakes\" >Common Selection Mistakes<\/a><\/li><li class='ez-toc-page-1 ez-toc-heading-level-2'><a class=\"ez-toc-link ez-toc-heading-15\" href=\"#\" data-href=\"https:\/\/www.cnspd.com\/it\/contactor-type-ats-vs-switch-type-ats\/#before-ordering-a-leeyee-compact-ats\" >Before Ordering a LEEYEE Compact 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\/contactor-type-ats-vs-switch-type-ats\/#faq\" >FAQ<\/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\/contactor-type-ats-vs-switch-type-ats\/#references\" >References<\/a><\/li><\/ul><\/nav><\/div>\n<h2><span class=\"ez-toc-section\" id=\"contactor-type-ats-vs-switch-type-ats-at-a-glance\"><\/span>Contactor Type ATS vs Switch Type ATS at a Glance<span class=\"ez-toc-section-end\"><\/span><\/h2>\r\n\r\n  <p>\r\n    For procurement, the most useful comparison is not a simple list of advantages and disadvantages. It is a comparison of the factors that change panel design, operating duty, short-circuit coordination, maintenance and project approval.\r\n  <\/p>\r\n\r\n  <div class=\"leeyee-table-wrap\">\r\n    <table class=\"leeyee-comparison-table\">\r\n      <thead>\r\n        <tr>\r\n          <th scope=\"col\">Decision factor<\/th>\r\n          <th scope=\"col\">Contactor-type ATS<\/th>\r\n          <th scope=\"col\">Switch-type ATS<\/th>\r\n        <\/tr>\r\n      <\/thead>\r\n      <tbody>\r\n        <tr>\r\n          <th scope=\"row\">Switching architecture<\/th>\r\n          <td data-label=\"Contactor-type ATS\">Two interlocked power contactors or a purpose-designed contactor switching assembly<\/td>\r\n          <td data-label=\"Switch-type ATS\">Dedicated change-over switching mechanism<\/td>\r\n        <\/tr>\r\n        <tr>\r\n          <th scope=\"row\">Typical IEC relationship<\/th>\r\n          <td data-label=\"Contactor-type ATS\">Often used in Class CC configurations; verify the complete TSE classification<\/td>\r\n          <td data-label=\"Switch-type ATS\">Often used in Class PC configurations; verify the complete TSE classification<\/td>\r\n        <\/tr>\r\n        <tr>\r\n          <th scope=\"row\">Operating speed<\/th>\r\n          <td data-label=\"Contactor-type ATS\">Electromagnetic actuation can be relatively fast<\/td>\r\n          <td data-label=\"Switch-type ATS\">Depends on the motor, solenoid or other mechanism used<\/td>\r\n        <\/tr>\r\n        <tr>\r\n          <th scope=\"row\">Operating endurance<\/th>\r\n          <td data-label=\"Contactor-type ATS\">High operation counts can be a design advantage<\/td>\r\n          <td data-label=\"Switch-type ATS\">Check mechanical and electrical endurance for the exact product<\/td>\r\n        <\/tr>\r\n        <tr>\r\n          <th scope=\"row\">Source interlocking<\/th>\r\n          <td data-label=\"Contactor-type ATS\">Mechanical and electrical interlocking are commonly required<\/td>\r\n          <td data-label=\"Switch-type ATS\">Source separation is normally built into the change-over mechanism<\/td>\r\n        <\/tr>\r\n        <tr>\r\n          <th scope=\"row\">Short-circuit interruption<\/th>\r\n          <td data-label=\"Contactor-type ATS\">Do not assume the contactors interrupt fault current<\/td>\r\n          <td data-label=\"Switch-type ATS\">Class PC equipment is not selected as a short-circuit protective breaker<\/td>\r\n        <\/tr>\r\n        <tr>\r\n          <th scope=\"row\">Isolation<\/th>\r\n          <td data-label=\"Contactor-type ATS\">Must be confirmed from the complete design<\/td>\r\n          <td data-label=\"Switch-type ATS\">Some devices provide an isolation function when specifically declared<\/td>\r\n        <\/tr>\r\n        <tr>\r\n          <th scope=\"row\">Panel integration<\/th>\r\n          <td data-label=\"Contactor-type ATS\">Flexible but may require more separately assembled control components<\/td>\r\n          <td data-label=\"Switch-type ATS\">Integrated ATS construction can simplify panel assembly<\/td>\r\n        <\/tr>\r\n        <tr>\r\n          <th scope=\"row\">Selection basis<\/th>\r\n          <td data-label=\"Contactor-type ATS\">Duty, endurance, utilization category, control logic and coordination<\/td>\r\n          <td data-label=\"Switch-type ATS\">Duty, integration, isolation requirements, utilization category and coordination<\/td>\r\n        <\/tr>\r\n      <\/tbody>\r\n    <\/table>\r\n  <\/div>\r\n\r\n  <p class=\"leeyee-table-note\">\r\n    Buyer conclusion: neither \u201ccontactor type\u201d nor \u201cswitch type\u201d describes the complete electrical capability of an ATS. Check the complete product ratings and the required protective-device arrangement.\r\n  <\/p>\r\n\r\n  <h2><span class=\"ez-toc-section\" id=\"how-do-the-two-ats-architectures-actually-differ\"><\/span>How Do the Two ATS Architectures Actually Differ?<span class=\"ez-toc-section-end\"><\/span><\/h2>\r\n\r\n  <p>\r\n    In a conventional contactor-based arrangement, one contactor connects the load to the normal source and another connects it to the alternate source. For open-transition operation, the design must prevent the two source contactors from closing at the same time. ABB's contactor-based ATS application guidance specifically requires electromechanical interlocking between the power contactors in its example systems.<sup class=\"leeyee-ref\"><a href=\"#ref-3\">[3]<\/a><\/sup>\r\n  <\/p>\r\n\r\n  <p>\r\n    A switch-type ATS uses a dedicated change-over mechanism to move the load connection from one source to the other. A typical switch-derived Class PC product is built as complete transfer switching equipment rather than simply two independently assembled contactors.<sup class=\"leeyee-ref\"><a href=\"#ref-4\">[4]<\/a><\/sup>\r\n  <\/p>\r\n\r\n  <figure class=\"leeyee-figure\">\r\n    <img loading=\"lazy\"\r\n      src=\"https:\/\/www.cnspd.com\/wp-content\/uploads\/2026\/09\/contactor-type-ats-vs-switch-type-ats-structure.webp\"\r\n      width=\"1448\"\r\n      height=\"1086\"\r\n      loading=\"lazy\"\r\n      decoding=\"async\"\r\n      alt=\"Contactor type ATS and switch type ATS internal structure comparison\">\r\n    <figcaption>\r\n      Contactor-based and switch-based ATS architectures use different power-transfer mechanisms. The diagram explains the structural difference; final IEC classification and ratings must be confirmed from the complete product documentation.\r\n    <\/figcaption>\r\n  <\/figure>\r\n\r\n  <div class=\"leeyee-buyer-meaning\">\r\n    <span class=\"leeyee-buyer-title\">Buyer Meaning<\/span>\r\n    <p>\r\n      Do not approve an ATS from a controller photo or from the words \u201cautomatic transfer\u201d alone. Ask how the power contacts are switched, how unintended source overlap is prevented, what the complete transfer equipment is rated for and what test documentation covers the selected configuration.\r\n    <\/p>\r\n  <\/div>\r\n\r\n  <div class=\"leeyee-product-scope\">\r\n    <span class=\"leeyee-product-label\">LEEYEE Product Scope<\/span>\r\n    <h3>Where Does the LEEYEE Compact ATS Fit?<\/h3>\r\n    <p>\r\n      LEEYEE's standard ATS range uses a <strong>compact integrated change-over construction<\/strong> with automatic\/manual operation and source\/status indication in one unit. It is not the traditional panel-built arrangement made from two separate power contactors.\r\n    <\/p>\r\n    <p>\r\n      In the context of this comparison, the LEEYEE product architecture is therefore closer to the <strong>purpose-built switch\/change-over side<\/strong> of the comparison. The contactor-type architecture is included in this guide to help engineers and buyers understand an important alternative used in the wider ATS market; it does not imply that LEEYEE's standard range includes a traditional two-contactor ATS.\r\n    <\/p>\r\n\r\n    <div class=\"leeyee-product-points\">\r\n      <div class=\"leeyee-product-point\">Compact integrated ATS body<\/div>\r\n      <div class=\"leeyee-product-point\">Automatic and manual operating modes<\/div>\r\n      <div class=\"leeyee-product-point\">Two-source change-over application<\/div>\r\n      <div class=\"leeyee-product-point\">Single-phase and three-phase configurations available within the range<\/div>\r\n      <div class=\"leeyee-product-point\">2P, 3P and 4P configurations according to model<\/div>\r\n      <div class=\"leeyee-product-point\">Standard range focused on open-transition transfer<\/div>\r\n    <\/div>\r\n\r\n    <p>\r\n      <strong>Important:<\/strong> physical appearance alone must not be used to assign IEC Class PC, utilization category, Icw, conditional short-circuit rating or certification scope. Those values must be confirmed from the datasheet, test report or certificate for the exact LEEYEE model being offered.\r\n    <\/p>\r\n  <\/div>\r\n\r\n  <h2><span class=\"ez-toc-section\" id=\"when-should-you-choose-a-contactor-type-or-switch-type-ats\"><\/span>When Should You Choose a Contactor Type or Switch Type ATS?<span class=\"ez-toc-section-end\"><\/span><\/h2>\r\n\r\n  <p>\r\n    There is no universal winner. The following conditions provide a useful starting point for a <strong>contactor-based ATS vs switch-based ATS<\/strong> comparison, but project-specific electrical requirements remain decisive.\r\n  <\/p>\r\n\r\n  <div class=\"leeyee-choice-grid\">\r\n    <div class=\"leeyee-choice-card\">\r\n      <h3>Contactor Type May Be Attractive When<\/h3>\r\n      <ul>\r\n        <li>the application expects comparatively frequent source transfers;<\/li>\r\n        <li>high operating endurance is a major requirement;<\/li>\r\n        <li>fast electromagnetic actuation is valuable to the transfer sequence;<\/li>\r\n        <li>the panel builder wants flexible control using separate contactors, relays and controller logic;<\/li>\r\n        <li>the complete assembly's utilization category and short-circuit coordination have been verified.<\/li>\r\n      <\/ul>\r\n    <\/div>\r\n\r\n    <div class=\"leeyee-choice-card\">\r\n      <h3>Switch Type May Be Attractive When<\/h3>\r\n      <ul>\r\n        <li>a purpose-built change-over mechanism is preferred;<\/li>\r\n        <li>compact integration is important;<\/li>\r\n        <li>stable mechanical switching positions are useful;<\/li>\r\n        <li>an isolation function is required and is specifically declared by the selected product;<\/li>\r\n        <li>the ATS ratings and upstream protective-device coordination match the project.<\/li>\r\n      <\/ul>\r\n    <\/div>\r\n  <\/div>\r\n\r\n  <div class=\"leeyee-note\">\r\n    <span class=\"leeyee-note-title\">Do Not Use Architecture as a Shortcut<\/span>\r\n    <p>\r\n      Rules such as \u201cgenerator = contactor,\u201d \u201cindustrial = switch,\u201d or \u201chigh current = switch type\u201d are too simplistic. The correct choice depends on load duty, fault level, switching frequency, utilization category, upstream protection and the complete ATS documentation.\r\n    <\/p>\r\n  <\/div>\r\n\r\n  <h2><span class=\"ez-toc-section\" id=\"%e2%80%9ccontactor-type%e2%80%9d-and-%e2%80%9cswitch-type%e2%80%9d-are-not-the-whole-iec-specification\"><\/span>\u201cContactor Type\u201d and \u201cSwitch Type\u201d Are Not the Whole IEC Specification<span class=\"ez-toc-section-end\"><\/span><\/h2>\r\n\r\n  <p>\r\n    The current international product standard is <strong>IEC 60947-6-1:2026, Edition 4.0<\/strong>. It applies to transfer switching equipment used to transfer a load between power sources within its specified voltage scope. The 2026 edition also contains specific requirements for bypass\/isolation TSE, closed-transition ATSE and stand-alone ATS controllers.<sup class=\"leeyee-ref\"><a href=\"#ref-1\">[1]<\/a><\/sup>\r\n  <\/p>\r\n\r\n  <p>\r\n    One point is particularly important for panel builders: IEC 60947-6-1:2026 does not cover TSE configurations that are not fully manufacturer type-tested or marked according to the document as a complete transfer switch.<sup class=\"leeyee-ref\"><a href=\"#ref-1\">[1]<\/a><\/sup>\r\n  <\/p>\r\n\r\n  <div class=\"leeyee-warning\">\r\n    <p>\r\n      <strong>Two contactors plus an ATS controller should not automatically be described as an IEC 60947-6-1 compliant complete ATSE.<\/strong> The complete assembly, interlocking, controller, switching devices, ratings, marking and conformity evidence must be verified.\r\n    <\/p>\r\n  <\/div>\r\n\r\n  <p>\r\n    ABB's IEC-market guidance describes Class CC solutions in relation to contactor technology and Class PC solutions in relation to switching equipment capable of making and withstanding specified short-circuit current without being intended to break short-circuit current as a protective circuit breaker does.<sup class=\"leeyee-ref\"><a href=\"#ref-2\">[2]<\/a><\/sup>\r\n  <\/p>\r\n\r\n  <p>\r\n    These relationships help explain the technologies, but buyers should use the classification declared for the complete product instead of assigning a class from its external appearance.\r\n  <\/p>\r\n\r\n  <h2><span class=\"ez-toc-section\" id=\"which-ats-type-switches-faster\"><\/span>Which ATS Type Switches Faster?<span class=\"ez-toc-section-end\"><\/span><\/h2>\r\n\r\n  <p>\r\n    A contactor mechanism can operate quickly because the contactor is electromagnetically actuated. ABB identifies relatively high switching speed as one advantage of contactor-based ATS solutions when compared with traditional motor-and-gearbox switch mechanisms.<sup class=\"leeyee-ref\"><a href=\"#ref-3\">[3]<\/a><\/sup>\r\n  <\/p>\r\n\r\n  <p>\r\n    That does <strong>not<\/strong> mean every contactor ATS is faster than every switch-type ATS. The actual result depends on the actuator, mechanism and controller used by the selected product.\r\n  <\/p>\r\n\r\n  <div class=\"leeyee-note\">\r\n    <span class=\"leeyee-note-title\">Engineering Meaning<\/span>\r\n    <p>\r\n      Compare <strong>total transfer time<\/strong>, not only the movement time of the switching mechanism. Source-failure detection, controller delays, generator starting and source stabilization can all affect the interruption experienced by the load.\r\n    <\/p>\r\n  <\/div>\r\n\r\n  <h3>Why generator backup is a good example<\/h3>\r\n\r\n  <p>\r\n    In a utility-to-generator system, the ATS normally does not transfer the load simply because its mechanical part can move quickly. The generator first needs to start and reach acceptable electrical conditions before the controller commands transfer.\r\n  <\/p>\r\n\r\n  <p>\r\n    This means a small difference in mechanism speed may be much less important than generator starting time, programmed delays and source qualification.\r\n  <\/p>\r\n\r\n  <h2><span class=\"ez-toc-section\" id=\"which-type-has-longer-mechanical-and-electrical-life\"><\/span>Which Type Has Longer Mechanical and Electrical Life?<span class=\"ez-toc-section-end\"><\/span><\/h2>\r\n\r\n  <p>\r\n    High operating endurance is a recognized advantage of contactor-based transfer solutions. ABB notes that contactors can support a high number of electrical operations, making them relevant in applications with frequent source transfers.<sup class=\"leeyee-ref\"><a href=\"#ref-3\">[3]<\/a><\/sup>\r\n  <\/p>\r\n\r\n  <p>\r\n    However, that does not justify a universal statement that every contactor ATS has a longer service life than every switch-type ATS.\r\n  <\/p>\r\n\r\n  <p>For project approval, check:<\/p>\r\n\r\n  <ul>\r\n    <li>mechanical endurance of the complete switching mechanism;<\/li>\r\n    <li>electrical endurance at the required operational current;<\/li>\r\n    <li>applicable utilization category;<\/li>\r\n    <li>expected number of transfers during the project life;<\/li>\r\n    <li>motor, inductive or mixed-load characteristics;<\/li>\r\n    <li>manufacturer conditions attached to the published endurance data.<\/li>\r\n  <\/ul>\r\n\r\n  <div class=\"leeyee-buyer-meaning\">\r\n    <span class=\"leeyee-buyer-title\">Buyer Meaning<\/span>\r\n    <p>\r\n      A headline mechanical-life number does not tell the whole story. For an OEM panel or project approval, electrical endurance at the required switching duty is usually the more useful comparison.\r\n    <\/p>\r\n  <\/div>\r\n\r\n  <h2><span class=\"ez-toc-section\" id=\"mechanical-and-electrical-interlocking-matter\"><\/span>Mechanical and Electrical Interlocking Matter<span class=\"ez-toc-section-end\"><\/span><\/h2>\r\n\r\n  <p>\r\n    For a conventional open-transition contactor ATS, the two source contactors must not close simultaneously. A mechanical interlock physically restricts simultaneous closure, while electrical control logic can provide another layer of command interlocking. ABB specifically requires electromechanical interlocking in its example contactor ATS systems.<sup class=\"leeyee-ref\"><a href=\"#ref-3\">[3]<\/a><\/sup>\r\n  <\/p>\r\n\r\n  <p>\r\n    In a purpose-built switch-type ATS, the source-change mechanism is normally designed as one mechanically coordinated switching system rather than two independently operated power contactors.\r\n  <\/p>\r\n\r\n  <div class=\"leeyee-warning\">\r\n    <p>\r\n      <strong>Do not confuse ordinary open-transition ATS with closed-transition ATS.<\/strong> LEEYEE's standard compact range is focused on ordinary open-transition transfer. Closed-transition, bypass\/isolation or other advanced schemes require project-specific engineering and should not be presented as standard stock functionality unless the exact supplied configuration has been confirmed.\r\n    <\/p>\r\n  <\/div>\r\n\r\n  <h2><span class=\"ez-toc-section\" id=\"short-circuit-capability-is-more-important-than-the-mechanism-name\"><\/span>Short-Circuit Capability Is More Important Than the Mechanism Name<span class=\"ez-toc-section-end\"><\/span><\/h2>\r\n\r\n  <p>\r\n    This is one of the most important checks for a main distribution board, generator panel or industrial installation. <strong>The ATS rated operational current is not the same thing as its short-circuit capability.<\/strong>\r\n  <\/p>\r\n\r\n  <p>\r\n    A 400 A transfer switch, for example, may be able to carry the required operational current, but the \u201c400 A\u201d rating alone does not establish whether it is suitable for the prospective fault current at its installation point.\r\n  <\/p>\r\n\r\n  <p>\r\n    ABB's IEC-market guidance explains that Class PC and Class CC solutions are not intended to break short-circuit current in the way Class CB equipment with overcurrent releases is intended to do. Their application therefore depends on correct coordination with the relevant upstream short-circuit protective device.<sup class=\"leeyee-ref\"><a href=\"#ref-2\">[2]<\/a><\/sup>\r\n  <\/p>\r\n\r\n  <p>\r\n    Depending on the product and project, the buyer may need to verify short-time withstand current <strong>Icw<\/strong>, conditional short-circuit capability, making capability and the exact upstream fuse, MCCB or ACB arrangement.\r\n  <\/p>\r\n\r\n  <figure class=\"leeyee-figure\">\r\n    <img loading=\"lazy\"\r\n      src=\"https:\/\/www.cnspd.com\/wp-content\/uploads\/2026\/09\/ats-short-circuit-coordination-diagram.webp\"\r\n      width=\"1448\"\r\n      height=\"1086\"\r\n      loading=\"lazy\"\r\n      decoding=\"async\"\r\n      alt=\"ATS short circuit coordination diagram showing upstream protection fault current and transfer switch ratings\">\r\n    <figcaption>\r\n      Short-circuit coordination must be checked across the complete path: source, protective device, ATS and load. Rated current alone does not establish suitability for the available fault current.\r\n    <\/figcaption>\r\n  <\/figure>\r\n\r\n  <div class=\"leeyee-key-line\">\r\n    Ie tells you how much operational current the ATS is intended to carry. It does not by itself tell you what fault current the complete installation can withstand.\r\n  <\/div>\r\n\r\n  <h3>What should an OEM buyer or panel builder confirm?<\/h3>\r\n\r\n  <ul>\r\n    <li>prospective short-circuit current at the ATS installation point;<\/li>\r\n    <li>the complete ATS short-circuit rating for the selected model;<\/li>\r\n    <li>Icw where applicable;<\/li>\r\n    <li>conditional short-circuit data where applicable;<\/li>\r\n    <li>the exact upstream protective device required for the declared rating;<\/li>\r\n    <li>confirmation that the data applies to the required voltage and pole configuration.<\/li>\r\n  <\/ul>\r\n\r\n  <h2><span class=\"ez-toc-section\" id=\"is-switch-type-ats-better-for-high-current-lv-panels\"><\/span>Is Switch Type ATS Better for High-Current LV Panels?<span class=\"ez-toc-section-end\"><\/span><\/h2>\r\n\r\n  <p>\r\n    <strong>No general rule supports choosing the architecture from current alone.<\/strong> Both contactor-based and switch-based transfer equipment are available at substantial current ratings.\r\n  <\/p>\r\n\r\n  <p>\r\n    Eaton currently publishes contactor-type automatic transfer switches with continuous-current ratings up to 3000 A.<sup class=\"leeyee-ref\"><a href=\"#ref-5\">[5]<\/a><\/sup> Socomec likewise publishes switch-derived Class PC transfer equipment across substantial current ranges.<sup class=\"leeyee-ref\"><a href=\"#ref-4\">[4]<\/a><\/sup>\r\n  <\/p>\r\n\r\n  <p>\r\n    These examples show why \u201csmall current = contactor\u201d and \u201clarge current = switch type\u201d are unreliable selection rules.\r\n  <\/p>\r\n\r\n  <p>For a high-current LV board, ask instead:<\/p>\r\n\r\n  <ul>\r\n    <li>What is the prospective fault current?<\/li>\r\n    <li>What short-circuit performance is required?<\/li>\r\n    <li>What utilization category applies?<\/li>\r\n    <li>What upstream protective device will be used?<\/li>\r\n    <li>Is an isolation function required?<\/li>\r\n    <li>Is the system 3P or 4P?<\/li>\r\n    <li>How often will the ATS transfer?<\/li>\r\n    <li>What maintenance strategy applies?<\/li>\r\n  <\/ul>\r\n\r\n  <h2><span class=\"ez-toc-section\" id=\"which-type-is-better-for-generator-backup\"><\/span>Which Type Is Better for Generator Backup?<span class=\"ez-toc-section-end\"><\/span><\/h2>\r\n\r\n  <p>\r\n    Either architecture can be technically suitable for a utility-to-generator standby system when the complete ATS is correctly selected. Generator backup does not automatically require a contactor-based architecture.\r\n  <\/p>\r\n\r\n  <p>\r\n    For LEEYEE's standard compact ATS range, the relevant question is therefore not \u201cShould I order the contactor version?\u201d but rather:\r\n  <\/p>\r\n\r\n  <ul>\r\n    <li>Does the compact open-transition ATS match the required operational current?<\/li>\r\n    <li>Does the required 2P, 3P or 4P configuration match the system?<\/li>\r\n    <li>Is the normal\/backup source arrangement suitable?<\/li>\r\n    <li>Does the generator control interface match the project?<\/li>\r\n    <li>Are the short-circuit conditions and upstream protection acceptable?<\/li>\r\n    <li>Are the required certificates and model-specific documents available?<\/li>\r\n  <\/ul>\r\n\r\n  <div class=\"leeyee-table-wrap\">\r\n    <table>\r\n      <thead>\r\n        <tr>\r\n          <th scope=\"col\">Project condition<\/th>\r\n          <th scope=\"col\">What should drive the selection?<\/th>\r\n        <\/tr>\r\n      <\/thead>\r\n      <tbody>\r\n        <tr>\r\n          <th scope=\"row\">Normal utility + standby generator<\/th>\r\n          <td>Source monitoring, generator interface, transfer sequence and protection coordination<\/td>\r\n        <\/tr>\r\n        <tr>\r\n          <th scope=\"row\">Unstable source with frequent transfer<\/th>\r\n          <td>Electrical endurance and transfer frequency become more important<\/td>\r\n        <\/tr>\r\n        <tr>\r\n          <th scope=\"row\">Main board with high fault level<\/th>\r\n          <td>Short-circuit capability and upstream SCPD coordination become critical<\/td>\r\n        <\/tr>\r\n        <tr>\r\n          <th scope=\"row\">Compact OEM panel<\/th>\r\n          <td>Footprint, integrated control and simplified wiring can become important<\/td>\r\n        <\/tr>\r\n        <tr>\r\n          <th scope=\"row\">Maintenance-sensitive project<\/th>\r\n          <td>Manual operation, isolation and service procedure require confirmation<\/td>\r\n        <\/tr>\r\n        <tr>\r\n          <th scope=\"row\">Critical process<\/th>\r\n          <td>Acceptable interruption time and transition method require project-specific confirmation<\/td>\r\n        <\/tr>\r\n      <\/tbody>\r\n    <\/table>\r\n  <\/div>\r\n\r\n  <h2><span class=\"ez-toc-section\" id=\"commercial-building-vs-industrial-application\"><\/span>Commercial Building vs Industrial Application<span class=\"ez-toc-section-end\"><\/span><\/h2>\r\n\r\n  <p>\r\n    Application labels alone do not determine the correct ATS architecture. The connected load, fault environment, transfer frequency and maintenance requirements matter more.\r\n  <\/p>\r\n\r\n  <h3>Commercial building distribution<\/h3>\r\n\r\n  <p>\r\n    A commercial project may prioritize standby-generator operation, predictable transfer logic, compact panel integration, straightforward manual operation and the required project documentation.\r\n  <\/p>\r\n\r\n  <p>\r\n    A compact integrated ATS can be a practical solution where its operational current, pole configuration, transfer method and protection coordination match the design.\r\n  <\/p>\r\n\r\n  <h3>Industrial panel or equipment system<\/h3>\r\n\r\n  <p>\r\n    An industrial application may add motors, high inrush, more frequent switching, process restart requirements, remote signals, higher fault levels or more demanding maintenance conditions.\r\n  <\/p>\r\n\r\n  <p>\r\n    In these projects, the buyer should confirm the utilization category and complete electrical duty rather than choosing only from the nominal ampere rating.\r\n  <\/p>\r\n\r\n  <h2><span class=\"ez-toc-section\" id=\"cost-compare-the-complete-installed-system\"><\/span>Cost: Compare the Complete Installed System<span class=\"ez-toc-section-end\"><\/span><\/h2>\r\n\r\n  <p>\r\n    Comparing only the price of the power switching element can give the wrong result.\r\n  <\/p>\r\n\r\n  <p>\r\n    A panel-built contactor ATS can require two contactors, mechanical interlocking, controller or voltage-monitoring relays, auxiliary components, wiring and enclosure space. ABB's application guidance illustrates this type of multi-component architecture.<sup class=\"leeyee-ref\"><a href=\"#ref-3\">[3]<\/a><\/sup>\r\n  <\/p>\r\n\r\n  <p>\r\n    A compact integrated change-over ATS can reduce separately assembled transfer components. For an OEM panel builder, that may affect assembly time, wiring complexity, enclosure layout and commissioning effort.\r\n  <\/p>\r\n\r\n  <p>Compare the complete installed cost, including:<\/p>\r\n\r\n  <ul>\r\n    <li>power switching device;<\/li>\r\n    <li>controller and monitoring functions;<\/li>\r\n    <li>mechanical and electrical interlocking;<\/li>\r\n    <li>auxiliary relays and wiring;<\/li>\r\n    <li>upstream protective devices;<\/li>\r\n    <li>panel and busbar space;<\/li>\r\n    <li>assembly and commissioning time;<\/li>\r\n    <li>spare parts;<\/li>\r\n    <li>maintenance requirements.<\/li>\r\n  <\/ul>\r\n\r\n  <h2><span class=\"ez-toc-section\" id=\"how-to-choose-between-contactor-type-and-switch-type-ats\"><\/span>How to Choose Between Contactor Type and Switch Type ATS<span class=\"ez-toc-section-end\"><\/span><\/h2>\r\n\r\n  <p>\r\n    The most reliable selection process starts with the electrical system and reaches the switching architecture only after the important requirements are known.\r\n  <\/p>\r\n\r\n  <ol class=\"leeyee-steps\">\r\n    <li>\r\n      <strong>Define the source arrangement.<\/strong>\r\n      Confirm whether the application is utility\u2013generator, utility\u2013utility or another supported two-source arrangement.\r\n    <\/li>\r\n    <li>\r\n      <strong>Confirm voltage, current, frequency and poles.<\/strong>\r\n      Define Ue, Ie, system frequency and the required 2P, 3P or 4P configuration.\r\n    <\/li>\r\n    <li>\r\n      <strong>Identify the load duty.<\/strong>\r\n      Determine whether the ATS supplies resistive loads, motors, mixed distribution loads or other demanding equipment.\r\n    <\/li>\r\n    <li>\r\n      <strong>Confirm the utilization category.<\/strong>\r\n      The required switching duty should match the complete ATS documentation.\r\n    <\/li>\r\n    <li>\r\n      <strong>Estimate transfer frequency.<\/strong>\r\n      Frequent transfer increases the importance of mechanical and electrical endurance.\r\n    <\/li>\r\n    <li>\r\n      <strong>Establish the fault level.<\/strong>\r\n      Obtain the prospective short-circuit current at the installation point.\r\n    <\/li>\r\n    <li>\r\n      <strong>Coordinate upstream protection.<\/strong>\r\n      Confirm the fuse, MCCB or ACB arrangement required for the ATS short-circuit rating.\r\n    <\/li>\r\n    <li>\r\n      <strong>Check project compliance.<\/strong>\r\n      Confirm the applicable IEC requirements, certificates, model data and any OEM documentation required by the customer.\r\n    <\/li>\r\n  <\/ol>\r\n\r\n  <figure class=\"leeyee-figure\">\r\n    <img loading=\"lazy\"\r\n      src=\"https:\/\/www.cnspd.com\/wp-content\/uploads\/2026\/09\/ats-selection-decision-flow.webp\"\r\n      width=\"1448\"\r\n      height=\"1086\"\r\n      loading=\"lazy\"\r\n      decoding=\"async\"\r\n      alt=\"ATS selection decision flow for contactor type and switch type automatic transfer switches\">\r\n    <figcaption>\r\n      ATS selection should begin with source configuration, load duty, fault level and project requirements. Choose the switching mechanism only after these conditions are defined.\r\n    <\/figcaption>\r\n  <\/figure>\r\n\r\n  <div class=\"leeyee-key-line\">\r\n    Choose the electrical requirements first. Choose the switching mechanism second.\r\n  <\/div>\r\n\r\n  <h2><span class=\"ez-toc-section\" id=\"common-selection-mistakes\"><\/span>Common Selection Mistakes<span class=\"ez-toc-section-end\"><\/span><\/h2>\r\n\r\n  <h3>\u201cContactor ATS is only for small current.\u201d<\/h3>\r\n  <p>\r\n    This is not a reliable rule. Eaton currently publishes contactor-type ATS equipment with continuous-current ratings up to 3000 A.<sup class=\"leeyee-ref\"><a href=\"#ref-5\">[5]<\/a><\/sup>\r\n  <\/p>\r\n\r\n  <h3>\u201cSwitch type is always slower.\u201d<\/h3>\r\n  <p>\r\n    Traditional motor-driven change-over mechanisms can be slower than solenoid contactors, but mechanism technology varies. Compare the actual product's transfer performance instead of assuming from the architecture name alone.\r\n  <\/p>\r\n\r\n  <h3>\u201cThe higher the ATS ampere rating, the higher its fault capability.\u201d<\/h3>\r\n  <p>\r\n    Rated operational current and short-circuit capability are different parameters. Verify both independently.\r\n  <\/p>\r\n\r\n  <h3>\u201cTwo mechanically interlocked contactors automatically make a compliant ATSE.\u201d<\/h3>\r\n  <p>\r\n    Do not make this assumption. IEC 60947-6-1:2026 requires the complete TSE configuration to fall within the applicable manufacturer testing and marking scope.<sup class=\"leeyee-ref\"><a href=\"#ref-1\">[1]<\/a><\/sup>\r\n  <\/p>\r\n\r\n  <h3>\u201cLEEYEE supplies both architectures shown in this comparison.\u201d<\/h3>\r\n  <p>\r\n    This guide compares two ATS technologies used in the market. LEEYEE's standard commercial range is the compact integrated change-over type described earlier, not a traditional panel-built two-contactor ATS.\r\n  <\/p>\r\n\r\n  <h2><span class=\"ez-toc-section\" id=\"before-ordering-a-leeyee-compact-ats\"><\/span>Before Ordering a LEEYEE Compact ATS<span class=\"ez-toc-section-end\"><\/span><\/h2>\r\n\r\n  <p>\r\n    A useful ATS recommendation requires more than a nominal current. Prepare the following information before confirming a model or OEM configuration:\r\n  <\/p>\r\n\r\n  <div class=\"leeyee-checklist\">\r\n    <div class=\"leeyee-checkitem\">Rated operational voltage Ue<\/div>\r\n    <div class=\"leeyee-checkitem\">Rated operational current Ie<\/div>\r\n    <div class=\"leeyee-checkitem\">System frequency<\/div>\r\n    <div class=\"leeyee-checkitem\">2P, 3P or 4P requirement<\/div>\r\n    <div class=\"leeyee-checkitem\">Utility\u2013generator or utility\u2013utility<\/div>\r\n    <div class=\"leeyee-checkitem\">Single-phase or three-phase system<\/div>\r\n    <div class=\"leeyee-checkitem\">Load type and utilization category<\/div>\r\n    <div class=\"leeyee-checkitem\">Expected transfer frequency<\/div>\r\n    <div class=\"leeyee-checkitem\">Prospective short-circuit current<\/div>\r\n    <div class=\"leeyee-checkitem\">Upstream fuse, MCCB or ACB<\/div>\r\n    <div class=\"leeyee-checkitem\">Required Icw or conditional short-circuit data where applicable<\/div>\r\n    <div class=\"leeyee-checkitem\">Neutral switching requirement<\/div>\r\n    <div class=\"leeyee-checkitem\">Generator start\/control requirement<\/div>\r\n    <div class=\"leeyee-checkitem\">Automatic\/manual operation requirement<\/div>\r\n    <div class=\"leeyee-checkitem\">Dry-contact or communication requirements<\/div>\r\n    <div class=\"leeyee-checkitem\">Required certificate and project documentation<\/div>\r\n    <div class=\"leeyee-checkitem\">Quantity<\/div>\r\n    <div class=\"leeyee-checkitem\">OEM label or private-label requirement<\/div>\r\n  <\/div>\r\n\r\n  <div class=\"leeyee-cta-box\">\r\n    <h3>Need to Confirm a Compact ATS Model?<\/h3>\r\n    <p>\r\n      Send LEEYEE your system voltage, current, pole configuration, normal and backup source arrangement, load type, prospective fault current and upstream protection. We can use these project details to confirm whether the standard compact ATS range matches your application.\r\n    <\/p>\r\n    <div class=\"leeyee-cta-actions\">\r\n      <button type=\"button\"\r\n              class=\"leeyee-about-btn-light leeyee-site-popup-btn\"\r\n              aria-label=\"Request ATS Model Recommendation\">\r\n        <span class=\"w-btn-label\">Request ATS Model Recommendation<\/span>\r\n      <\/button>\r\n    <\/div>\r\n  <\/div>\r\n\r\n  <h2><span class=\"ez-toc-section\" id=\"faq\"><\/span>FAQ<span class=\"ez-toc-section-end\"><\/span><\/h2>\r\n\r\n  <div class=\"leeyee-faq\">\r\n\r\n    <details>\r\n      <summary>Is a contactor type ATS faster than a switch type ATS?<\/summary>\r\n      <div class=\"leeyee-faq-answer\">\r\n        <p>\r\n          A solenoid-operated contactor can operate quickly, particularly compared with a traditional motor-and-gearbox change-over mechanism. This is not a universal rule for all products. Compare the complete transfer time of the exact ATS and controller sequence.<sup class=\"leeyee-ref\"><a href=\"#ref-3\">[3]<\/a><\/sup>\r\n        <\/p>\r\n      <\/div>\r\n    <\/details>\r\n\r\n    <details>\r\n      <summary>Which ATS type has a longer operating life?<\/summary>\r\n      <div class=\"leeyee-faq-answer\">\r\n        <p>\r\n          Contactor-based solutions can provide high operating endurance and may be attractive for frequent transfer applications. However, the correct comparison is the mechanical and electrical endurance declared for the specific products at the required switching duty.<sup class=\"leeyee-ref\"><a href=\"#ref-3\">[3]<\/a><\/sup>\r\n        <\/p>\r\n      <\/div>\r\n    <\/details>\r\n\r\n    <details>\r\n      <summary>Can a contactor ATS be used for high-current systems?<\/summary>\r\n      <div class=\"leeyee-faq-answer\">\r\n        <p>\r\n          Yes. High-current contactor-type transfer equipment exists. Eaton, for example, currently publishes contactor-type ATS products up to 3000 A. Current rating alone therefore does not determine the architecture.<sup class=\"leeyee-ref\"><a href=\"#ref-5\">[5]<\/a><\/sup>\r\n        <\/p>\r\n      <\/div>\r\n    <\/details>\r\n\r\n    <details>\r\n      <summary>What is the difference between Class CC and Class PC ATS?<\/summary>\r\n      <div class=\"leeyee-faq-answer\">\r\n        <p>\r\n          ABB's IEC-market guidance associates Class CC with contactor-based transfer technology and Class PC with switching equipment capable of making and withstanding specified short-circuit current without being intended to interrupt that fault as a protective breaker. Always confirm the classification declared for the complete product.<sup class=\"leeyee-ref\"><a href=\"#ref-2\">[2]<\/a><\/sup>\r\n        <\/p>\r\n      <\/div>\r\n    <\/details>\r\n\r\n    <details>\r\n      <summary>Is the LEEYEE compact ATS a traditional contactor type ATS?<\/summary>\r\n      <div class=\"leeyee-faq-answer\">\r\n        <p>\r\n          No. LEEYEE's standard product is a compact integrated change-over ATS rather than a panel-built arrangement using two separate power contactors. This article discusses contactor-based ATS technology for comparison so buyers can understand the structural and application differences.\r\n        <\/p>\r\n      <\/div>\r\n    <\/details>\r\n\r\n    <details>\r\n      <summary>Can I identify the IEC class of a LEEYEE ATS from its appearance?<\/summary>\r\n      <div class=\"leeyee-faq-answer\">\r\n        <p>\r\n          No. External construction can help explain the switching architecture, but IEC class, utilization category, Icw, conditional short-circuit capability and certification scope must be verified from the documentation for the exact model.\r\n        <\/p>\r\n      <\/div>\r\n    <\/details>\r\n\r\n    <details>\r\n      <summary>Is the LEEYEE standard ATS suitable for generator backup?<\/summary>\r\n      <div class=\"leeyee-faq-answer\">\r\n        <p>\r\n          The compact ATS range is intended for two-source transfer applications including normal-source and backup-source systems, but suitability for a specific generator project still depends on voltage, current, poles, generator control logic, protection coordination and model-specific ratings.\r\n        <\/p>\r\n      <\/div>\r\n    <\/details>\r\n\r\n    <details>\r\n      <summary>Do I need a 3-pole or 4-pole ATS for a generator?<\/summary>\r\n      <div class=\"leeyee-faq-answer\">\r\n        <p>\r\n          Generator use alone does not determine the answer. Neutral switching depends on the earthing arrangement, generator bonding, system design, protection strategy and applicable project requirements. Confirm the neutral treatment before ordering the pole configuration.\r\n        <\/p>\r\n      <\/div>\r\n    <\/details>\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-references\">\r\n    <li id=\"ref-1\">\r\n      International Electrotechnical Commission (IEC).\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>, Edition 4.0, published 2 April 2026.\r\n      <a href=\"https:\/\/webstore.iec.ch\/en\/publication\/90494\" target=\"_blank\" rel=\"noopener noreferrer\">IEC official publication page<\/a>.\r\n    <\/li>\r\n\r\n    <li id=\"ref-2\">\r\n      ABB.\r\n      <em>How to Select an Automatic Transfer Switch Class \u2014 A Guide for IEC Markets<\/em>.\r\n      Technical guidance on Class PC, Class CB and Class CC architectures, short-circuit performance and operating considerations.\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-3\">\r\n      ABB.\r\n      <em>Contactor-Based Automatic Transfer Switch Solutions \u2014 Implementation Tips for IEC Markets<\/em>.\r\n      Application note covering contactor operation, switching speed, electrical operations, interlocking and ATS implementation.\r\n      <a href=\"https:\/\/library.e.abb.com\/public\/81dc3025a94c4b1cb605943ffa6e131f\/1SAC200128W0001_A_ApplNote_AutoTransferSwitch.pdf\" target=\"_blank\" rel=\"noopener noreferrer\">ABB application note<\/a>.\r\n    <\/li>\r\n\r\n    <li id=\"ref-4\">\r\n      Socomec.\r\n      <em>ATyS p Automatic Transfer Switching Equipment<\/em>.\r\n      Manufacturer documentation describing switch-type derived Class PC ATSE and IEC 60947-6-1 conformity.\r\n      <a href=\"https:\/\/apac.socomec.com\/en\/p\/atys-p\" target=\"_blank\" rel=\"noopener noreferrer\">Socomec ATyS p<\/a>.\r\n    <\/li>\r\n\r\n    <li id=\"ref-5\">\r\n      Eaton.\r\n      <em>Contactor Type Automatic Transfer Switches<\/em>.\r\n      Current manufacturer information listing continuous-current ratings up to 3000 A and describing an interlocked contactor-type transfer switching mechanism.\r\n      <a href=\"https:\/\/www.eaton.com\/us\/en-us\/catalog\/low-voltage-power-distribution-controls-systems\/contactor-type-automatic-transfer-switch.html\" target=\"_blank\" rel=\"noopener noreferrer\">Eaton contactor-type ATS<\/a>.\r\n    <\/li>\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>Choosing between a contactor type ATS and a switch type ATS is not simply a question of which design is faster, carries more current, or costs less. Both architectures are used in low-voltage source-transfer systems, but they are built differently. For panel builders, generator integrators and OEM buyers, the correct decision depends on switching duty,&#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-31264","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>Contactor Type ATS vs Switch Type ATS | IEC Selection Guide<\/title>\n<meta name=\"description\" content=\"Compare contactor type vs switch type ATS for generator and LV panels, and learn where a compact integrated ATS fits by duty, endurance and fault conditions.\" \/>\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\/contactor-type-ats-vs-switch-type-ats\/\" \/>\n<meta property=\"og:locale\" content=\"it_IT\" \/>\n<meta property=\"og:type\" content=\"article\" \/>\n<meta property=\"og:title\" content=\"Contactor Type ATS vs Switch Type ATS | IEC Selection Guide\" \/>\n<meta property=\"og:description\" content=\"Compare contactor type vs switch type ATS for generator and LV panels, and learn where a compact integrated ATS fits by duty, endurance and fault conditions.\" \/>\n<meta property=\"og:url\" content=\"https:\/\/www.cnspd.com\/it\/contactor-type-ats-vs-switch-type-ats\/\" \/>\n<meta property=\"og:site_name\" content=\"Surge Protector, Surge Arrestor, Isolating Switch - 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