{"id":31581,"date":"2026-10-09T13:29:42","date_gmt":"2026-10-09T05:29:42","guid":{"rendered":"https:\/\/www.cnspd.com\/?p=31581"},"modified":"2026-10-09T13:29:56","modified_gmt":"2026-10-09T05:29:56","slug":"marine-automatic-transfer-switch-shore-power-generator-selection-guide","status":"publish","type":"post","link":"https:\/\/www.cnspd.com\/id\/marine-automatic-transfer-switch\/","title":{"rendered":"Marine Automatic Transfer Switch: Shore Power &#038; Generator Selection Guide"},"content":{"rendered":"\t\t<div data-elementor-type=\"wp-post\" data-elementor-id=\"31581\" class=\"elementor elementor-31581\" data-elementor-post-type=\"post\">\n\t\t\t\t<div class=\"elementor-element elementor-element-b4d28e7 e-flex e-con-boxed e-con e-parent\" data-id=\"b4d28e7\" 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-9ae756f elementor-widget elementor-widget-html\" data-id=\"9ae756f\" 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-marine-ats,\r\n.leeyee-marine-ats * {\r\n  box-sizing: border-box;\r\n}\r\n\r\n.leeyee-marine-ats {\r\n  --ly-blue: #004898;\r\n  --ly-blue-dark: #00366f;\r\n  --ly-blue-soft: #eef5ff;\r\n  --ly-blue-soft-2: #f7fbff;\r\n  --ly-text: #26333f;\r\n  --ly-muted: #64717d;\r\n  --ly-border: #d9e4ed;\r\n  --ly-warning-bg: #fff9ef;\r\n  --ly-warning-border: #d58a1d;\r\n\r\n  width: 100%;\r\n  max-width: 860px;\r\n  margin: 0 auto;\r\n  padding: 8px 20px 48px;\r\n  color: var(--ly-text);\r\n  font-size: 17px;\r\n  line-height: 1.72;\r\n  overflow-wrap: break-word;\r\n}\r\n\r\n.leeyee-marine-ats p {\r\n  margin: 0 0 18px;\r\n}\r\n\r\n.leeyee-marine-ats a {\r\n  color: var(--ly-blue);\r\n  text-decoration: underline;\r\n  text-decoration-thickness: 1px;\r\n  text-underline-offset: 3px;\r\n}\r\n\r\n.leeyee-marine-ats a:hover {\r\n  color: var(--ly-blue-dark);\r\n}\r\n\r\n.leeyee-marine-ats h2 {\r\n  margin: 56px 0 20px;\r\n  color: #17242f;\r\n  font-size: 31px;\r\n  line-height: 1.25;\r\n  font-weight: 750;\r\n  letter-spacing: -0.015em;\r\n}\r\n\r\n.leeyee-marine-ats h3 {\r\n  margin: 34px 0 13px;\r\n  color: #1d2b37;\r\n  font-size: 23px;\r\n  line-height: 1.34;\r\n  font-weight: 730;\r\n}\r\n\r\n.leeyee-marine-ats strong {\r\n  color: #17242f;\r\n  font-weight: 700;\r\n}\r\n\r\n.leeyee-marine-ats sup {\r\n  color: var(--ly-blue);\r\n  font-size: .72em;\r\n  font-weight: 700;\r\n  line-height: 0;\r\n}\r\n\r\n.leeyee-marine-ats img {\r\n  max-width: 100%;\r\n  height: auto;\r\n}\r\n\r\n.leeyee-marine-ats .ly-intro {\r\n  margin-bottom: 23px;\r\n  color: #354451;\r\n  font-size: 18px;\r\n  line-height: 1.7;\r\n}\r\n\r\n\/* Quick Answer *\/\r\n\r\n.leeyee-marine-ats .ly-quick {\r\n  margin: 26px 0 30px;\r\n  padding: 23px 25px;\r\n  border: 1px solid #c8dceb;\r\n  border-left: 4px solid var(--ly-blue);\r\n  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9px;\r\n  background: #fff;\r\n  -webkit-overflow-scrolling: touch;\r\n}\r\n\r\n.leeyee-marine-ats table {\r\n  width: 100%;\r\n  min-width: 620px;\r\n  margin: 0;\r\n  border-collapse: collapse;\r\n  font-size: 15.5px;\r\n  line-height: 1.5;\r\n}\r\n\r\n.leeyee-marine-ats th {\r\n  padding: 13px 14px;\r\n  border-right: 1px solid rgba(255,255,255,.18);\r\n  background: var(--ly-blue);\r\n  color: #fff;\r\n  text-align: left;\r\n  vertical-align: top;\r\n  font-weight: 700;\r\n}\r\n\r\n.leeyee-marine-ats th:last-child,\r\n.leeyee-marine-ats td:last-child {\r\n  border-right: 0;\r\n}\r\n\r\n.leeyee-marine-ats td {\r\n  padding: 13px 14px;\r\n  border-top: 1px solid var(--ly-border);\r\n  border-right: 1px solid var(--ly-border);\r\n  color: #344350;\r\n  vertical-align: top;\r\n}\r\n\r\n.leeyee-marine-ats tbody tr:nth-child(even) td {\r\n  background: #f9fbfd;\r\n}\r\n\r\n.leeyee-marine-ats .ly-table-note {\r\n  margin: 9px 0 25px;\r\n  color: var(--ly-muted);\r\n  font-size: 14.5px;\r\n  line-height: 1.6;\r\n}\r\n\r\n\/* Notes *\/\r\n\r\n.leeyee-marine-ats .ly-note,\r\n.leeyee-marine-ats .ly-warning {\r\n  margin: 24px 0 28px;\r\n  padding: 19px 21px;\r\n  border-radius: 9px;\r\n}\r\n\r\n.leeyee-marine-ats .ly-note {\r\n  border: 1px solid #c8dcec;\r\n  border-left: 4px solid var(--ly-blue);\r\n  background: var(--ly-blue-soft-2);\r\n}\r\n\r\n.leeyee-marine-ats .ly-warning {\r\n  border: 1px solid #eed8b4;\r\n  border-left: 4px solid var(--ly-warning-border);\r\n  background: var(--ly-warning-bg);\r\n}\r\n\r\n.leeyee-marine-ats .ly-note-title,\r\n.leeyee-marine-ats .ly-warning-title {\r\n  display: block;\r\n  margin-bottom: 7px;\r\n  font-weight: 800;\r\n}\r\n\r\n.leeyee-marine-ats .ly-note-title {\r\n  color: var(--ly-blue);\r\n}\r\n\r\n.leeyee-marine-ats .ly-warning-title {\r\n  color: #85520d;\r\n}\r\n\r\n.leeyee-marine-ats ul,\r\n.leeyee-marine-ats ol {\r\n  margin: 12px 0 22px;\r\n  padding-left: 24px;\r\n}\r\n\r\n.leeyee-marine-ats li {\r\n  margin: 7px 0;\r\n  padding-left: 3px;\r\n}\r\n\r\n.leeyee-marine-ats .ly-decision-flow {\r\n  margin: 24px 0 29px;\r\n  padding: 20px 22px;\r\n  border: 1px solid var(--ly-border);\r\n  border-radius: 10px;\r\n  background: #fff;\r\n}\r\n\r\n.leeyee-marine-ats .ly-decision-flow ol {\r\n  margin-bottom: 0;\r\n}\r\n\r\n.leeyee-marine-ats .ly-decision-flow strong {\r\n  color: var(--ly-blue);\r\n}\r\n\r\n\/*\r\nIMPORTANT:\r\nNo custom .lyd11 layout CSS is included here.\r\nThe ATS product box uses the existing LEEYEE .lyd11 site styles.\r\nThis prevents this article from overriding the working product-card layout.\r\n*\/\r\n\r\n\/* Checklist *\/\r\n\r\n.leeyee-marine-ats .ly-checklist {\r\n  display: grid;\r\n  grid-template-columns: repeat(2, minmax(0, 1fr));\r\n  gap: 17px;\r\n  margin: 22px 0 30px;\r\n}\r\n\r\n.leeyee-marine-ats .ly-check-group {\r\n  padding: 19px 20px;\r\n  border: 1px solid var(--ly-border);\r\n  border-radius: 9px;\r\n  background: #fff;\r\n}\r\n\r\n.leeyee-marine-ats .ly-check-group h3 {\r\n  margin: 0 0 10px;\r\n  color: var(--ly-blue);\r\n  font-size: 19px;\r\n}\r\n\r\n.leeyee-marine-ats .ly-check-group ul {\r\n  margin: 0;\r\n  padding-left: 20px;\r\n}\r\n\r\n\/* Main CTA *\/\r\n\r\n.leeyee-marine-ats .ly-cta {\r\n  margin: 32px 0 39px;\r\n  padding: 24px 25px;\r\n  border: 1px solid #bed6e9;\r\n  border-radius: 11px;\r\n  background: var(--ly-blue-soft);\r\n}\r\n\r\n.leeyee-marine-ats .ly-cta h3 {\r\n  margin: 0 0 10px;\r\n  color: #17314a;\r\n  font-size: 22px;\r\n}\r\n\r\n.leeyee-marine-ats .ly-cta-actions {\r\n  margin-top: 17px;\r\n}\r\n\r\n.leeyee-marine-ats .ly-cta .leeyee-about-btn-light.leeyee-site-popup-btn {\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  width: auto;\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-family: inherit;\r\n  font-size: 16px;\r\n  line-height: 1.25;\r\n  font-weight: 700;\r\n  text-align: center;\r\n  cursor: pointer;\r\n  box-shadow: 0 4px 12px rgba(0,72,152,.10);\r\n  transition:\r\n    background-color .18s ease,\r\n    color .18s ease,\r\n    border-color .18s ease,\r\n    transform .18s ease,\r\n    box-shadow .18s ease;\r\n}\r\n\r\n.leeyee-marine-ats .ly-cta .leeyee-about-btn-light.leeyee-site-popup-btn:hover {\r\n  border-color: #004898;\r\n  background: #004898;\r\n  color: #fff;\r\n  transform: translateY(-1px);\r\n  box-shadow: 0 7px 16px rgba(0,72,152,.16);\r\n}\r\n\r\n.leeyee-marine-ats .ly-cta .leeyee-about-btn-light.leeyee-site-popup-btn:focus-visible {\r\n  outline: 3px solid rgba(0,72,152,.26);\r\n  outline-offset: 3px;\r\n}\r\n\r\n.leeyee-marine-ats .w-btn-label {\r\n  display: inline-block;\r\n}\r\n\r\n\/* Related *\/\r\n\r\n.leeyee-marine-ats .ly-related {\r\n  margin: 25px 0 33px;\r\n  padding: 20px 22px;\r\n  border-top: 1px solid var(--ly-border);\r\n  border-bottom: 1px solid var(--ly-border);\r\n}\r\n\r\n.leeyee-marine-ats .ly-related strong {\r\n  display: block;\r\n  margin-bottom: 9px;\r\n}\r\n\r\n.leeyee-marine-ats .ly-related ul {\r\n  margin: 0;\r\n  padding-left: 20px;\r\n}\r\n\r\n\/* FAQ *\/\r\n\r\n.leeyee-marine-ats .ly-faq {\r\n  border-top: 1px solid var(--ly-border);\r\n}\r\n\r\n.leeyee-marine-ats .ly-faq-item {\r\n  padding: 20px 0;\r\n  border-bottom: 1px solid var(--ly-border);\r\n}\r\n\r\n.leeyee-marine-ats .ly-faq-item h3 {\r\n  margin: 0 0 8px;\r\n  font-size: 20px;\r\n}\r\n\r\n.leeyee-marine-ats .ly-faq-item p:last-child {\r\n  margin-bottom: 0;\r\n}\r\n\r\n\/* References *\/\r\n\r\n.leeyee-marine-ats .ly-references {\r\n  margin-top: 54px;\r\n  padding-top: 4px;\r\n}\r\n\r\n.leeyee-marine-ats .ly-references ol {\r\n  padding-left: 22px;\r\n}\r\n\r\n.leeyee-marine-ats .ly-references li {\r\n  margin: 11px 0;\r\n  color: #4c5965;\r\n  font-size: 14.5px;\r\n  line-height: 1.62;\r\n}\r\n\r\n.leeyee-marine-ats .ly-final-note {\r\n  margin: 24px 0 0;\r\n  padding: 18px 20px;\r\n  border-left: 4px solid #478a68;\r\n  border-radius: 8px;\r\n  background: #f2faf6;\r\n}\r\n\r\n\/* Responsive *\/\r\n\r\n@media (max-width: 820px) {\r\n  .leeyee-marine-ats {\r\n    padding-left: 18px;\r\n    padding-right: 18px;\r\n  }\r\n\r\n  .leeyee-marine-ats h2 {\r\n    margin-top: 48px;\r\n    font-size: 28px;\r\n  }\r\n\r\n  .leeyee-marine-ats h3 {\r\n    font-size: 21px;\r\n  }\r\n}\r\n\r\n@media (max-width: 600px) {\r\n  .leeyee-marine-ats {\r\n    padding: 5px 15px 38px;\r\n    font-size: 16px;\r\n    line-height: 1.7;\r\n  }\r\n\r\n  .leeyee-marine-ats .ly-intro {\r\n    font-size: 17px;\r\n  }\r\n\r\n  .leeyee-marine-ats h2 {\r\n    margin-top: 42px;\r\n    margin-bottom: 16px;\r\n    font-size: 25px;\r\n    line-height: 1.3;\r\n  }\r\n\r\n  .leeyee-marine-ats h3 {\r\n    margin-top: 29px;\r\n    font-size: 20px;\r\n  }\r\n\r\n  .leeyee-marine-ats .ly-quick,\r\n  .leeyee-marine-ats .ly-note,\r\n  .leeyee-marine-ats .ly-warning,\r\n  .leeyee-marine-ats .ly-cta {\r\n    padding: 18px;\r\n  }\r\n\r\n  .leeyee-marine-ats .ly-summary-grid,\r\n  .leeyee-marine-ats .ly-checklist {\r\n    grid-template-columns: 1fr;\r\n    gap: 10px;\r\n  }\r\n\r\n  .leeyee-marine-ats table {\r\n    min-width: 570px;\r\n    font-size: 14.5px;\r\n  }\r\n\r\n  .leeyee-marine-ats th,\r\n  .leeyee-marine-ats td {\r\n    padding: 11px 12px;\r\n  }\r\n\r\n  .leeyee-marine-ats .ly-tech-figure {\r\n    margin: 22px 0 28px;\r\n  }\r\n\r\n  .leeyee-marine-ats .ly-tech-figure img {\r\n    border-radius: 8px;\r\n  }\r\n\r\n  .leeyee-marine-ats .ly-tech-figure figcaption {\r\n    margin-top: 8px;\r\n    font-size: 13px;\r\n  }\r\n\r\n  .leeyee-marine-ats .ly-cta .leeyee-about-btn-light.leeyee-site-popup-btn {\r\n    width: 100%;\r\n  }\r\n}\r\n\r\n@media (max-width: 430px) {\r\n  .leeyee-marine-ats {\r\n    padding-left: 13px;\r\n    padding-right: 13px;\r\n  }\r\n}\r\n\r\n@media (max-width: 390px) {\r\n  .leeyee-marine-ats {\r\n    padding-left: 12px;\r\n    padding-right: 12px;\r\n  }\r\n\r\n  .leeyee-marine-ats h2 {\r\n    font-size: 23px;\r\n  }\r\n\r\n  .leeyee-marine-ats .ly-quick,\r\n  .leeyee-marine-ats .ly-note,\r\n  .leeyee-marine-ats .ly-warning,\r\n  .leeyee-marine-ats .ly-cta,\r\n  .leeyee-marine-ats .ly-check-group {\r\n    padding-left: 15px;\r\n    padding-right: 15px;\r\n  }\r\n}\r\n<\/style>\r\n\r\n<article class=\"leeyee-marine-ats\">\r\n\r\n  <p class=\"ly-intro\">\r\n    A marine automatic transfer switch can be considered when a low-voltage load needs to transfer automatically between two AC sources such as shore power and a generator. For a vessel, port-equipment panel or marine auxiliary system, however, choosing the ATS by ampere rating alone is not enough. Voltage, frequency, poles, neutral arrangement, transfer method, protection coordination, environmental conditions and any required marine approval must all be confirmed.\r\n  <\/p>\r\n\r\n  <div class=\"ly-quick\">\r\n    <span class=\"ly-label\">Quick Answer<\/span>\r\n\r\n    <p>\r\n      <strong>A compact automatic transfer switch may be suitable for selected marine auxiliary and port-equipment low-voltage systems, but a standard ATS should not automatically be described as a marine-certified transfer switch.<\/strong>\r\n    <\/p>\r\n\r\n    <p>\r\n      IEC 60947-6-1:2026 covers transfer switching equipment used to transfer a load between power sources, while the IEC 60092 series addresses electrical installations and low-voltage assemblies used in ships.<sup>[1][2][3]<\/sup> The ATS device, the complete panel and any vessel or classification approval therefore need to be evaluated separately.\r\n    <\/p>\r\n  <\/div>\r\n\r\n  <div class=\"ly-summary-grid\">\r\n\r\n    <div class=\"ly-summary-item\">\r\n      <strong>Electrical configuration<\/strong>\r\n      <span>Confirm voltage, frequency, phase, load current and pole configuration.<\/span>\r\n    <\/div>\r\n\r\n    <div class=\"ly-summary-item\">\r\n      <strong>Transfer function<\/strong>\r\n      <span>Confirm source priority, open-transition operation and generator-control needs.<\/span>\r\n    <\/div>\r\n\r\n    <div class=\"ly-summary-item\">\r\n      <strong>Marine environment<\/strong>\r\n      <span>Confirm humidity, salt exposure, vibration, temperature and enclosure conditions.<\/span>\r\n    <\/div>\r\n\r\n    <div class=\"ly-summary-item\">\r\n      <strong>Approval scope<\/strong>\r\n      <span>Confirm vessel rules, classification requirements and required documentation separately.<\/span>\r\n    <\/div>\r\n\r\n  <\/div>\r\n\r\n  <figure class=\"ly-tech-figure\">\r\n    <img\r\n      src=\"https:\/\/www.cnspd.com\/wp-content\/uploads\/2026\/09\/marine-ats-shore-power-generator-system-diagram.webp\"\r\n      alt=\"Marine automatic transfer switch diagram between shore power, generator and low-voltage auxiliary loads\"\r\n      loading=\"eager\"\r\n      decoding=\"async\">\r\n\r\n    <figcaption>\r\n      Simplified two-source marine low-voltage arrangement. The diagram explains the ATS function only; it does not represent a complete vessel main switchboard, synchronization system or approved project wiring drawing.\r\n    <\/figcaption>\r\n  <\/figure>\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\/id\/marine-automatic-transfer-switch\/#marine-ats-selection-at-a-glance\" >Marine ATS Selection 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\/id\/marine-automatic-transfer-switch\/#where-does-the-ats-sit-between-shore-power-generator-and-the-load\" >Where Does the ATS Sit Between Shore Power, Generator and the Load?<\/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\/marine-automatic-transfer-switch\/#how-does-shore-power-to-generator-transfer-work\" >How Does Shore-Power-to-Generator Transfer Work?<\/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\/marine-automatic-transfer-switch\/#why-source-interlocking-matters\" >Why Source Interlocking Matters<\/a><\/li><li class='ez-toc-page-1 ez-toc-heading-level-2'><a class=\"ez-toc-link ez-toc-heading-5\" href=\"#\" data-href=\"https:\/\/www.cnspd.com\/id\/marine-automatic-transfer-switch\/#does-a-marine-ats-need-2p-3p-or-4p\" >Does a Marine ATS Need 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-6\" href=\"#\" data-href=\"https:\/\/www.cnspd.com\/id\/marine-automatic-transfer-switch\/#how-should-the-ats-current-rating-be-selected\" >How Should the ATS Current Rating Be Selected?<\/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\/marine-automatic-transfer-switch\/#50-hz-or-60-hz-the-two-sources-must-be-compatible\" >50 Hz or 60 Hz? The Two Sources Must Be Compatible<\/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\/marine-automatic-transfer-switch\/#marine-environments-add-requirements-beyond-electrical-ratings\" >Marine Environments Add Requirements Beyond Electrical Ratings<\/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\/marine-automatic-transfer-switch\/#iec-60947-6-1-and-iec-60092-do-different-jobs\" >IEC 60947-6-1 and IEC 60092 Do Different Jobs<\/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\/marine-automatic-transfer-switch\/#is-a-normal-automatic-transfer-switch-suitable-for-marine-use\" >Is a Normal Automatic Transfer Switch Suitable for Marine Use?<\/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\/marine-automatic-transfer-switch\/#where-the-leeyee-compact-ats-fits\" >Where the LEEYEE Compact ATS Fits<\/a><\/li><li class='ez-toc-page-1 ez-toc-heading-level-2'><a class=\"ez-toc-link ez-toc-heading-12\" href=\"#\" data-href=\"https:\/\/www.cnspd.com\/id\/marine-automatic-transfer-switch\/#what-a-compact-ats-does-not-replace\" >What a Compact ATS Does Not Replace<\/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\/marine-automatic-transfer-switch\/#before-ordering-marine-ats-engineering-checklist\" >Before Ordering: Marine ATS Engineering 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\/marine-automatic-transfer-switch\/#related-ats-engineering-guides\" >Related ATS Engineering Guides<\/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\/marine-automatic-transfer-switch\/#frequently-asked-questions\" >Frequently Asked Questions<\/a><\/li><li class='ez-toc-page-1 ez-toc-heading-level-2'><a class=\"ez-toc-link ez-toc-heading-16\" href=\"#\" data-href=\"https:\/\/www.cnspd.com\/id\/marine-automatic-transfer-switch\/#references\" >References<\/a><\/li><\/ul><\/nav><\/div>\n<h2><span class=\"ez-toc-section\" id=\"marine-ats-selection-at-a-glance\"><\/span>Marine ATS Selection at a Glance<span class=\"ez-toc-section-end\"><\/span><\/h2>\r\n\r\n  <p>\r\n    Start with the actual source arrangement and load. A buyer searching for a marine automatic transfer switch normally needs to answer one system question first: <strong>which two sources are being transferred, and what must remain connected to the load?<\/strong>\r\n  <\/p>\r\n\r\n  <div class=\"ly-table-wrap\">\r\n    <table>\r\n      <thead>\r\n        <tr>\r\n          <th>System arrangement<\/th>\r\n          <th>Confirm first<\/th>\r\n          <th>Buyer meaning<\/th>\r\n        <\/tr>\r\n      <\/thead>\r\n\r\n      <tbody>\r\n        <tr>\r\n          <td>Shore power + generator<\/td>\r\n          <td>Voltage, frequency, source priority and interlocking<\/td>\r\n          <td>Confirm how the generator becomes available and how unintended source overlap is prevented.<\/td>\r\n        <\/tr>\r\n\r\n        <tr>\r\n          <td>Shore power + another AC source<\/td>\r\n          <td>Source compatibility and neutral arrangement<\/td>\r\n          <td>The ATS cannot make electrically incompatible sources equivalent.<\/td>\r\n        <\/tr>\r\n\r\n        <tr>\r\n          <td>Single-phase auxiliary circuit<\/td>\r\n          <td>Current and conductor switching<\/td>\r\n          <td>Confirm whether line and neutral must both be transferred.<\/td>\r\n        <\/tr>\r\n\r\n        <tr>\r\n          <td>Three-phase auxiliary circuit<\/td>\r\n          <td>3P or 4P arrangement<\/td>\r\n          <td>Neutral switching must follow the actual electrical design.<\/td>\r\n        <\/tr>\r\n\r\n        <tr>\r\n          <td>Classed vessel or specified project<\/td>\r\n          <td>Required approval and documentation<\/td>\r\n          <td>Electrical ratings alone do not establish classification acceptance.<\/td>\r\n        <\/tr>\r\n      <\/tbody>\r\n    <\/table>\r\n  <\/div>\r\n\r\n  <p class=\"ly-table-note\">\r\n    <strong>Procurement conclusion:<\/strong> \u201cI need a 63A marine ATS\u201d is not enough information. A useful technical enquiry should describe the two sources, voltage, frequency, phase, neutral arrangement, load and project approval requirements.\r\n  <\/p>\r\n\r\n  <h2><span class=\"ez-toc-section\" id=\"where-does-the-ats-sit-between-shore-power-generator-and-the-load\"><\/span>Where Does the ATS Sit Between Shore Power, Generator and the Load?<span class=\"ez-toc-section-end\"><\/span><\/h2>\r\n\r\n  <p>\r\n    The compact ATS discussed on this page is a transfer device between two low-voltage sources and one load circuit. IEC 60947-6-1:2026 applies to transfer switching equipment used to transfer a load between power supply sources within the standard's scope.<sup>[1]<\/sup>\r\n  <\/p>\r\n\r\n  <p>\r\n    A transfer device is not the same thing as a complete marine electrical assembly. IEC 60092-302-2:2025 addresses low-voltage marine power switchgear and controlgear assemblies and distinguishes complete assemblies from the individual devices installed inside them.<sup>[2]<\/sup>\r\n  <\/p>\r\n\r\n  <div class=\"ly-note\">\r\n    <span class=\"ly-note-title\">Engineering boundary<\/span>\r\n\r\n    <p>\r\n      This page concerns compact two-source low-voltage transfer. Generator paralleling, bus-tie control, synchronization, load sharing, power-management systems and complete marine main-switchboard design are separate engineering subjects.\r\n    <\/p>\r\n  <\/div>\r\n\r\n  <h2><span class=\"ez-toc-section\" id=\"how-does-shore-power-to-generator-transfer-work\"><\/span>How Does Shore-Power-to-Generator Transfer Work?<span class=\"ez-toc-section-end\"><\/span><\/h2>\r\n\r\n  <p>\r\n    For the standard compact ATS configuration discussed here, the relevant concept is primarily <strong>open transition<\/strong>. Open transition is break-before-make: the connected source is disconnected before the alternative source is connected.\r\n  <\/p>\r\n\r\n  <figure class=\"ly-tech-figure\">\r\n    <img\r\n      src=\"https:\/\/www.cnspd.com\/wp-content\/uploads\/2026\/09\/marine-ats-open-transition-switching-sequence.webp\"\r\n      alt=\"Open transition marine ATS switching sequence from shore power to generator\"\r\n      loading=\"lazy\"\r\n      decoding=\"async\">\r\n\r\n    <figcaption>\r\n      Open-transition transfer separates the two sources during the switching sequence. It should not be confused with generator paralleling or closed-transition synchronization.\r\n    <\/figcaption>\r\n  <\/figure>\r\n\r\n  <p>\r\n    IEC 60947-6-1:2026 treats ATSE with closed-transition capability as a specific equipment function with dedicated requirements.<sup>[1]<\/sup> A normal compact open-transition ATS should therefore not be presented as a closed-transition or source-synchronization solution.\r\n  <\/p>\r\n\r\n  <p>\r\n    When the alternate source is a generator, generator start time is separate from the actual switching action. The generator may need time to start and reach acceptable electrical conditions before the controller permits transfer.\r\n  <\/p>\r\n\r\n  <div class=\"ly-warning\">\r\n    <span class=\"ly-warning-title\">Do not confuse ATS transfer with generator paralleling<\/span>\r\n\r\n    <p>\r\n      If a project requires shore power and generator power to overlap, synchronize or operate in parallel, a standard compact open-transition ATS is not enough. The project requires equipment and control architecture specifically designed for those functions.\r\n    <\/p>\r\n  <\/div>\r\n\r\n  <h2><span class=\"ez-toc-section\" id=\"why-source-interlocking-matters\"><\/span>Why Source Interlocking Matters<span class=\"ez-toc-section-end\"><\/span><\/h2>\r\n\r\n  <p>\r\n    A shore-power and generator arrangement normally needs a defined method of preventing unintended connection of sources that are not intended to operate in parallel. The exact interlocking method depends on the complete system and applicable project rules.\r\n  <\/p>\r\n\r\n  <p>\r\n    Classification requirements can include source-control and interlocking provisions, but they must be checked against the actual vessel type, rule edition and electrical architecture. The ATS alone should never be used as evidence that the complete shore-connection system has obtained vessel or classification approval.<sup>[4]<\/sup>\r\n  <\/p>\r\n\r\n  <h2><span class=\"ez-toc-section\" id=\"does-a-marine-ats-need-2p-3p-or-4p\"><\/span>Does a Marine ATS Need 2P, 3P or 4P?<span class=\"ez-toc-section-end\"><\/span><\/h2>\r\n\r\n  <p>\r\n    <strong>Marine does not automatically mean 4P.<\/strong> Pole selection depends on the phase arrangement, neutral arrangement, earthing design, power-source configuration and project requirements. IEC 60092-201:2019 addresses ship electrical-system design topics including distribution systems, system earthing and sources of electrical power.<sup>[3]<\/sup>\r\n  <\/p>\r\n\r\n  <figure class=\"ly-tech-figure\">\r\n    <img\r\n      src=\"https:\/\/www.cnspd.com\/wp-content\/uploads\/2026\/09\/marine-ats-2p-3p-4p-neutral-selection-guide.webp\"\r\n      alt=\"Marine ATS 2P 3P and 4P pole selection guide based on phase and neutral arrangement\"\r\n      loading=\"lazy\"\r\n      decoding=\"async\">\r\n\r\n    <figcaption>\r\n      The number of switched poles must follow the real electrical system. The neutral arrangement should be confirmed before selecting a 3P or 4P transfer configuration.\r\n    <\/figcaption>\r\n  <\/figure>\r\n\r\n  <h3>2P ATS<\/h3>\r\n\r\n  <p>\r\n    A 2P ATS may be considered for a single-phase system where the design requires two conductors to be transferred. Whether the neutral must be switched depends on the actual source and earthing arrangement.\r\n  <\/p>\r\n\r\n  <h3>3P ATS<\/h3>\r\n\r\n  <p>\r\n    A 3P ATS transfers three phase conductors while the neutral remains outside the switching poles. This configuration is appropriate only when the complete electrical design permits an unswitched neutral.\r\n  <\/p>\r\n\r\n  <h3>4P ATS<\/h3>\r\n\r\n  <p>\r\n    A 4P ATS transfers L1, L2, L3 and neutral. It may be required where switched neutral is part of the electrical design, but should not be specified merely because the application is marine.\r\n  <\/p>\r\n\r\n  <div class=\"ly-note\">\r\n    <span class=\"ly-note-title\">Neutral and protective earth are different<\/span>\r\n\r\n    <p>\r\n      Protective earth should not be treated as an ordinary switched pole. Neutral switching, bonding and protective-earth continuity are separate design questions and should be confirmed by the responsible electrical designer.\r\n    <\/p>\r\n  <\/div>\r\n\r\n  <h2><span class=\"ez-toc-section\" id=\"how-should-the-ats-current-rating-be-selected\"><\/span>How Should the ATS Current Rating Be Selected?<span class=\"ez-toc-section-end\"><\/span><\/h2>\r\n\r\n  <p>\r\n    Rated current is important, but it is only one selection parameter. The ATS must also match the real voltage, frequency, pole configuration, source arrangement and utilization conditions.\r\n  <\/p>\r\n\r\n  <p>\r\n    Motor, pump or compressor loads may introduce starting-current considerations. The system designer should also review upstream protective devices and the available short-circuit conditions at the installation point. The transfer switch does not replace circuit breakers, fuses or the wider protection design.\r\n  <\/p>\r\n\r\n  <div class=\"ly-decision-flow\">\r\n    <ol>\r\n      <li><strong>Define both sources:<\/strong> shore supply, generator or another AC source.<\/li>\r\n      <li><strong>Define the load:<\/strong> continuous current and important starting characteristics.<\/li>\r\n      <li><strong>Confirm voltage and frequency:<\/strong> use actual project values.<\/li>\r\n      <li><strong>Confirm phase and poles:<\/strong> select the ATS from the real conductor arrangement.<\/li>\r\n      <li><strong>Review protection coordination:<\/strong> check upstream protection and fault conditions.<\/li>\r\n      <li><strong>Review environment and approval:<\/strong> verify marine conditions separately.<\/li>\r\n    <\/ol>\r\n  <\/div>\r\n\r\n  <h2><span class=\"ez-toc-section\" id=\"50-hz-or-60-hz-the-two-sources-must-be-compatible\"><\/span>50 Hz or 60 Hz? The Two Sources Must Be Compatible<span class=\"ez-toc-section-end\"><\/span><\/h2>\r\n\r\n  <p>\r\n    An ATS changes which source supplies the load. It does not convert voltage or frequency and does not make incompatible sources suitable for the same equipment.\r\n  <\/p>\r\n\r\n  <p>\r\n    Shore power, generator output, the ATS control circuit and the connected loads therefore need to be checked together. In three-phase applications, the complete project may also need to consider phase sequence and the requirements of downstream equipment.<sup>[3]<\/sup>\r\n  <\/p>\r\n\r\n  <div class=\"ly-warning\">\r\n    <span class=\"ly-warning-title\">Project confirmation required<\/span>\r\n\r\n    <p>\r\n      Do not assume an available shore supply can feed the vessel simply because it can be physically connected. Confirm voltage, frequency, phase arrangement, neutral\/earthing design and connected-load requirements.\r\n    <\/p>\r\n  <\/div>\r\n\r\n  <h2><span class=\"ez-toc-section\" id=\"marine-environments-add-requirements-beyond-electrical-ratings\"><\/span>Marine Environments Add Requirements Beyond Electrical Ratings<span class=\"ez-toc-section-end\"><\/span><\/h2>\r\n\r\n  <p>\r\n    Marine and port environments can introduce humidity, condensation, salt exposure, vibration and temperature conditions that are not proven by an ordinary voltage or current rating.\r\n  <\/p>\r\n\r\n  <figure class=\"ly-tech-figure\">\r\n    <img\r\n      src=\"https:\/\/www.cnspd.com\/wp-content\/uploads\/2026\/09\/marine-ats-environmental-requirements-checklist.webp\"\r\n      alt=\"Marine ATS environmental requirements including humidity salt vibration temperature and condensation\"\r\n      loading=\"lazy\"\r\n      decoding=\"async\">\r\n\r\n    <figcaption>\r\n      Environmental suitability is a separate verification step. Required limits and tests depend on the installation location, enclosure, vessel and project specification.\r\n    <\/figcaption>\r\n  <\/figure>\r\n\r\n  <div class=\"ly-table-wrap\">\r\n    <table>\r\n      <thead>\r\n        <tr>\r\n          <th>Condition<\/th>\r\n          <th>Why it matters<\/th>\r\n          <th>What to confirm<\/th>\r\n        <\/tr>\r\n      <\/thead>\r\n\r\n      <tbody>\r\n        <tr>\r\n          <td>Humidity \/ condensation<\/td>\r\n          <td>Can affect insulation and long-term reliability<\/td>\r\n          <td>Installation location, enclosure and qualification requirement<\/td>\r\n        <\/tr>\r\n\r\n        <tr>\r\n          <td>Salt exposure<\/td>\r\n          <td>Can increase corrosion risk<\/td>\r\n          <td>Cabinet, terminals, material protection and project requirements<\/td>\r\n        <\/tr>\r\n\r\n        <tr>\r\n          <td>Vibration<\/td>\r\n          <td>Can affect mechanical and electrical connections<\/td>\r\n          <td>Installation position and required test level<\/td>\r\n        <\/tr>\r\n\r\n        <tr>\r\n          <td>Temperature<\/td>\r\n          <td>Affects permissible operating conditions<\/td>\r\n          <td>Actual minimum and maximum ambient conditions<\/td>\r\n        <\/tr>\r\n\r\n        <tr>\r\n          <td>EMC environment<\/td>\r\n          <td>May affect monitoring and electronic control<\/td>\r\n          <td>Applicable product and project requirements<\/td>\r\n        <\/tr>\r\n      <\/tbody>\r\n    <\/table>\r\n  <\/div>\r\n\r\n  <p class=\"ly-table-note\">\r\n    This table does not claim that a standard LEEYEE compact ATS has passed every marine environmental test. Required limits, test evidence and approval scope must be confirmed for the exact project.\r\n  <\/p>\r\n\r\n  <h2><span class=\"ez-toc-section\" id=\"iec-60947-6-1-and-iec-60092-do-different-jobs\"><\/span>IEC 60947-6-1 and IEC 60092 Do Different Jobs<span class=\"ez-toc-section-end\"><\/span><\/h2>\r\n\r\n  <p>\r\n    A common procurement mistake is to treat compliance with an ATS product standard as proof that the entire marine installation is approved. These are different questions.\r\n  <\/p>\r\n\r\n  <p>\r\n    <strong>IEC 60947-6-1:2026<\/strong> is the IEC product standard covering transfer switching equipment used for transferring a load between power sources.<sup>[1]<\/sup>\r\n  <\/p>\r\n\r\n  <p>\r\n    <strong>IEC 60092-201:2019<\/strong> covers general system-design features for ship electrical installations, including distribution, earthing and sources of electrical power.<sup>[3]<\/sup>\r\n  <\/p>\r\n\r\n  <p>\r\n    <strong>IEC 60092-302-2:2025<\/strong> covers low-voltage marine power switchgear and controlgear assemblies and addresses additional considerations associated with marine applications.<sup>[2]<\/sup>\r\n  <\/p>\r\n\r\n  <figure class=\"ly-tech-figure\">\r\n    <img\r\n      src=\"https:\/\/www.cnspd.com\/wp-content\/uploads\/2026\/09\/marine-ats-device-system-classification-boundary.webp\"\r\n      alt=\"Marine ATS engineering boundary between transfer switch device marine low-voltage system and classification requirements\"\r\n      loading=\"lazy\"\r\n      decoding=\"async\">\r\n\r\n    <figcaption>\r\n      Product requirements, marine assembly requirements and vessel\/classification approval are related but separate layers of project verification.\r\n    <\/figcaption>\r\n  <\/figure>\r\n\r\n  <div class=\"ly-warning\">\r\n    <span class=\"ly-warning-title\">Certification boundary<\/span>\r\n\r\n    <p>\r\n      Referencing IEC 60947-6-1 or the IEC 60092 series does not mean that every standard LEEYEE ATS is approved by ABS, DNV, Lloyd's Register, Bureau Veritas, CCS or another classification society. Where marine classification is required, confirm the exact product, assembly, documentation and approval scope before specification.\r\n    <\/p>\r\n  <\/div>\r\n\r\n  <h2><span class=\"ez-toc-section\" id=\"is-a-normal-automatic-transfer-switch-suitable-for-marine-use\"><\/span>Is a Normal Automatic Transfer Switch Suitable for Marine Use?<span class=\"ez-toc-section-end\"><\/span><\/h2>\r\n\r\n  <p>\r\n    <strong>Not automatically.<\/strong> A standard compact ATS can be evaluated for selected marine auxiliary low-voltage circuits if its voltage, frequency, current, pole configuration, transfer method and protection conditions match the system. Marine installations can introduce additional environmental and approval requirements that are not demonstrated by an ATS nameplate rating alone.<sup>[1][2][3]<\/sup>\r\n  <\/p>\r\n\r\n  <p>\r\n    For a panel builder or marine electrical integrator, the better question is: <strong>does this exact compact ATS configuration meet the electrical requirements of the circuit, and what additional marine project verification is still required?<\/strong>\r\n  <\/p>\r\n\r\n  <h2><span class=\"ez-toc-section\" id=\"where-the-leeyee-compact-ats-fits\"><\/span>Where the LEEYEE Compact ATS Fits<span class=\"ez-toc-section-end\"><\/span><\/h2>\r\n\r\n  <p>\r\n    LEEYEE supplies compact automatic transfer switches for low-voltage dual-source, solar backup, generator and grid switching systems. In a marine project, the ATS should first be checked against the circuit's electrical requirements, while marine environmental and classification requirements remain separate engineering checks.\r\n  <\/p>\r\n\r\n  <div class=\"lyd11\" style=\"margin:24px 0 32px;\">\r\n    <div class=\"lyd11-bar\"><\/div>\r\n\r\n    <div class=\"lyd11-inner\">\r\n\r\n      <img decoding=\"async\"\r\n        class=\"lyd11-img\"\r\n        src=\"https:\/\/www.cnspd.com\/wp-content\/uploads\/2026\/06\/2.png\"\r\n        alt=\"LEEYEE automatic transfer switch for solar backup power systems\">\r\n\r\n      <div class=\"lyd11-body\">\r\n\r\n        <div class=\"lyd11-title-row\">\r\n          <span class=\"lyd11-title\">Automatic Transfer Switch for Solar Backup<\/span>\r\n          <span class=\"lyd11-badge\">2P \/ 4P<\/span>\r\n        <\/div>\r\n\r\n        <div class=\"lyd11-desc\">\r\n          Dual-power automatic transfer switch for solar backup, generator, and grid power switching systems\r\n        <\/div>\r\n\r\n        <div class=\"lyd11-bottom\">\r\n\r\n          <span class=\"lyd11-meta\">\r\n            63A\u2013125A \u00b7 Solar \/ Backup Power\r\n          <\/span>\r\n\r\n          <a\r\n            class=\"lyd11-btn-primary\"\r\n            href=\"https:\/\/www.cnspd.com\/products\/leeyee-automatic-transfer-switch-solar-backup\/\"\r\n            target=\"_blank\"\r\n            rel=\"noopener\">\r\n            View Product\r\n          <\/a>\r\n\r\n          <button\r\n            type=\"button\"\r\n            class=\"lyd11-btn-secondary leeyee-site-popup-btn\"\r\n            aria-label=\"Get Quote\">\r\n            <span class=\"w-btn-label\">Get Quote<\/span>\r\n          <\/button>\r\n\r\n        <\/div>\r\n\r\n      <\/div>\r\n\r\n    <\/div>\r\n  <\/div>\r\n\r\n  <div class=\"ly-note\">\r\n    <span class=\"ly-note-title\">Product scope<\/span>\r\n\r\n    <p>\r\n      This LEEYEE product is a compact low-voltage automatic transfer switch. Using it in a marine project does not by itself establish marine environmental qualification or classification approval. Humidity, salt exposure, vibration, enclosure conditions and any required vessel approval must still be confirmed separately.\r\n    <\/p>\r\n  <\/div>\r\n\r\n  <h2><span class=\"ez-toc-section\" id=\"what-a-compact-ats-does-not-replace\"><\/span>What a Compact ATS Does Not Replace<span class=\"ez-toc-section-end\"><\/span><\/h2>\r\n\r\n  <ul>\r\n    <li>A complete marine main switchboard.<\/li>\r\n    <li>A generator paralleling controller.<\/li>\r\n    <li>A load-sharing system.<\/li>\r\n    <li>A synchronization system.<\/li>\r\n    <li>A closed-transition system unless the exact equipment provides that function.<\/li>\r\n    <li>A complete shore-power connection system.<\/li>\r\n    <li>A vessel power-management system.<\/li>\r\n    <li>Marine classification approval.<\/li>\r\n  <\/ul>\r\n\r\n  <p>\r\n    IEC 60947-6-1 separately addresses specialized transfer-switching functions such as closed-transition operation.<sup>[1]<\/sup> These functions should not be assumed to exist in an ordinary compact ATS.\r\n  <\/p>\r\n\r\n  <h2><span class=\"ez-toc-section\" id=\"before-ordering-marine-ats-engineering-checklist\"><\/span>Before Ordering: Marine ATS Engineering Checklist<span class=\"ez-toc-section-end\"><\/span><\/h2>\r\n\r\n  <p>\r\n    Send the following information before fixing an ATS configuration. This lets the supplier, panel builder and system integrator evaluate the actual application instead of selecting only by current rating.\r\n  <\/p>\r\n\r\n  <div class=\"ly-checklist\">\r\n\r\n    <div class=\"ly-check-group\">\r\n      <h3>Power Sources<\/h3>\r\n      <ul>\r\n        <li>Normal source type<\/li>\r\n        <li>Backup source type<\/li>\r\n        <li>Nominal voltage<\/li>\r\n        <li>50Hz or 60Hz<\/li>\r\n        <li>Single-phase or three-phase<\/li>\r\n        <li>Preferred source<\/li>\r\n      <\/ul>\r\n    <\/div>\r\n\r\n    <div class=\"ly-check-group\">\r\n      <h3>Load &amp; Protection<\/h3>\r\n      <ul>\r\n        <li>Continuous load current<\/li>\r\n        <li>Motor or pump starting characteristics<\/li>\r\n        <li>Upstream protective device<\/li>\r\n        <li>Available fault information<\/li>\r\n        <li>Critical-load requirements<\/li>\r\n      <\/ul>\r\n    <\/div>\r\n\r\n    <div class=\"ly-check-group\">\r\n      <h3>Transfer Configuration<\/h3>\r\n      <ul>\r\n        <li>Required 2P \/ 3P \/ 4P arrangement<\/li>\r\n        <li>Neutral arrangement<\/li>\r\n        <li>Earthing arrangement<\/li>\r\n        <li>Automatic \/ manual requirement<\/li>\r\n        <li>Generator start interface<\/li>\r\n        <li>Transfer and return-delay requirements<\/li>\r\n        <li>Required status \/ dry contacts<\/li>\r\n      <\/ul>\r\n    <\/div>\r\n\r\n    <div class=\"ly-check-group\">\r\n      <h3>Marine Conditions<\/h3>\r\n      <ul>\r\n        <li>Vessel or port-equipment application<\/li>\r\n        <li>Installation location<\/li>\r\n        <li>Temperature range<\/li>\r\n        <li>Humidity \/ condensation<\/li>\r\n        <li>Salt exposure<\/li>\r\n        <li>Vibration requirement<\/li>\r\n        <li>Enclosure requirement<\/li>\r\n        <li>Required standards \/ class documents<\/li>\r\n      <\/ul>\r\n    <\/div>\r\n\r\n  <\/div>\r\n\r\n  <div class=\"ly-cta\">\r\n\r\n    <h3>Need to review a marine low-voltage ATS configuration?<\/h3>\r\n\r\n    <p>\r\n      Send the two power sources, voltage, frequency, load current, required poles, neutral arrangement, environmental conditions and approval requirements. LEEYEE can review whether the compact ATS configuration is appropriate for further project evaluation.\r\n    <\/p>\r\n\r\n    <div class=\"ly-cta-actions\">\r\n      <button\r\n        type=\"button\"\r\n        class=\"leeyee-about-btn-light leeyee-site-popup-btn\"\r\n        aria-label=\"Share Your Marine ATS Requirements\">\r\n        <span class=\"w-btn-label\">Share Your Marine ATS Requirements<\/span>\r\n      <\/button>\r\n    <\/div>\r\n\r\n  <\/div>\r\n\r\n  <h2><span class=\"ez-toc-section\" id=\"related-ats-engineering-guides\"><\/span>Related ATS Engineering Guides<span class=\"ez-toc-section-end\"><\/span><\/h2>\r\n\r\n  <div class=\"ly-related\">\r\n\r\n    <strong>Continue the ATS selection process:<\/strong>\r\n\r\n    <ul>\r\n      <li>\r\n        <a href=\"https:\/\/www.cnspd.com\/what-is-an-automatic-transfer-switch-how-ats-works-how-to-choose\/\">\r\n          Automatic Transfer Switch Selection Guide\r\n        <\/a>\r\n        \u2014 general ATS selection logic, operating principle and configuration considerations.\r\n      <\/li>\r\n\r\n      <li>\r\n        <a href=\"https:\/\/www.cnspd.com\/how-automatic-transfer-switch-works\/\">\r\n          How an Automatic Transfer Switch Works\r\n        <\/a>\r\n        \u2014 deeper explanation of source monitoring, transfer sequence and return logic.\r\n      <\/li>\r\n\r\n      <li>\r\n        <a href=\"https:\/\/www.cnspd.com\/products\/leeyee-automatic-transfer-switch-solar-backup\/\">\r\n          Automatic Transfer Switch for Solar Backup\r\n        <\/a>\r\n        \u2014 review the actual LEEYEE product and available configuration.\r\n      <\/li>\r\n    <\/ul>\r\n\r\n  <\/div>\r\n\r\n  <h2><span class=\"ez-toc-section\" id=\"frequently-asked-questions\"><\/span>Frequently Asked Questions<span class=\"ez-toc-section-end\"><\/span><\/h2>\r\n\r\n  <div class=\"ly-faq\">\r\n\r\n    <div class=\"ly-faq-item\">\r\n      <h3>Can an ATS automatically switch from shore power to generator power?<\/h3>\r\n\r\n      <p>\r\n        Yes, when the transfer system is suitable for both sources and the generator-control sequence is correctly coordinated. Generator starting and stabilization are separate from the ATS switching action.\r\n      <\/p>\r\n    <\/div>\r\n\r\n    <div class=\"ly-faq-item\">\r\n      <h3>Does a marine ATS always require four poles?<\/h3>\r\n\r\n      <p>\r\n        No. Pole count depends on the phase configuration, neutral arrangement, earthing design and project requirements. Marine application alone does not determine whether 3P or 4P is required.<sup>[3]<\/sup>\r\n      <\/p>\r\n    <\/div>\r\n\r\n    <div class=\"ly-faq-item\">\r\n      <h3>Can this LEEYEE compact ATS be evaluated for a marine project?<\/h3>\r\n\r\n      <p>\r\n        Yes. It can be evaluated for selected low-voltage dual-source applications when the product's electrical configuration matches the circuit. Marine environmental conditions and any required classification approval must still be checked separately.\r\n      <\/p>\r\n    <\/div>\r\n\r\n    <div class=\"ly-faq-item\">\r\n      <h3>Can an IEC 60947-6-1 ATS automatically be called marine certified?<\/h3>\r\n\r\n      <p>\r\n        No. IEC 60947-6-1 is a product standard for transfer switching equipment.<sup>[1]<\/sup> Marine system design, assembly requirements and classification approval are separate matters.\r\n      <\/p>\r\n    <\/div>\r\n\r\n    <div class=\"ly-faq-item\">\r\n      <h3>Is open-transition ATS operation the same as synchronization?<\/h3>\r\n\r\n      <p>\r\n        No. Open transition is break-before-make and separates the two sources during transfer. Synchronization and closed-transition operation require different equipment capability and system engineering.<sup>[1]<\/sup>\r\n      <\/p>\r\n    <\/div>\r\n\r\n    <div class=\"ly-faq-item\">\r\n      <h3>Do humidity, salt and vibration matter if the ATS is inside a cabinet?<\/h3>\r\n\r\n      <p>\r\n        They can. The enclosure changes the exposure conditions, but the complete cabinet, location and required environmental qualification still need to be evaluated.<sup>[2]<\/sup>\r\n      <\/p>\r\n    <\/div>\r\n\r\n    <div class=\"ly-faq-item\">\r\n      <h3>What information should a buyer provide for a marine ATS quotation?<\/h3>\r\n\r\n      <p>\r\n        Provide both power sources, voltage, frequency, phase, continuous load current, poles, neutral and earthing arrangement, generator-control requirements, installation environment and required standards or classification documents.\r\n      <\/p>\r\n    <\/div>\r\n\r\n  <\/div>\r\n\r\n  <h2><span class=\"ez-toc-section\" id=\"references\"><\/span>References<span class=\"ez-toc-section-end\"><\/span><\/h2>\r\n\r\n  <div class=\"ly-references\">\r\n\r\n    <ol>\r\n      <li>\r\n        <strong>[1] International Electrotechnical Commission (IEC).<\/strong>\r\n        IEC 60947-6-1:2026,\r\n        <em>Low-voltage switchgear and controlgear \u2013 Part 6-1: Multiple function equipment \u2013 Transfer switching equipment<\/em>.\r\n      <\/li>\r\n\r\n      <li>\r\n        <strong>[2] International Electrotechnical Commission (IEC).<\/strong>\r\n        IEC 60092-302-2:2025,\r\n        <em>Electrical installations in ships \u2013 Part 302-2: Low voltage switchgear and controlgear assemblies \u2013 Marine power<\/em>.\r\n      <\/li>\r\n\r\n      <li>\r\n        <strong>[3] International Electrotechnical Commission (IEC).<\/strong>\r\n        IEC 60092-201:2019,\r\n        <em>Electrical installations in ships \u2013 Part 201: System design \u2013 General<\/em>.\r\n      <\/li>\r\n\r\n      <li>\r\n        <strong>[4] American Bureau of Shipping (ABS).<\/strong>\r\n        <em>Rules for Building and Classing Marine Vessels<\/em>. Applicable requirements depend on vessel type, electrical architecture and current rule edition.\r\n      <\/li>\r\n    <\/ol>\r\n\r\n  <\/div>\r\n\r\n  <div class=\"ly-final-note\">\r\n\r\n    <p>\r\n      <strong>Project confirmation:<\/strong> This guide supports B2B engineering discussion and preliminary ATS selection. Final acceptance must follow the actual vessel electrical design, load characteristics, protection scheme, environmental conditions, applicable standards, flag requirements and classification rules. Do not use this article as a substitute for approved project drawings, model-specific documentation or classification review.\r\n    <\/p>\r\n\r\n  <\/div>\r\n\r\n  <script>\r\n  document.addEventListener('DOMContentLoaded', function () {\r\n    var aboutPopupButtons = document.querySelectorAll('.leeyee-site-popup-btn');\r\n\r\n    aboutPopupButtons.forEach(function (button) {\r\n      button.addEventListener('click', function () {\r\n        var realPopupTrigger = document.querySelector(\r\n          '.w-popup.ush_popup_1 .w-popup-trigger'\r\n        );\r\n\r\n        if (realPopupTrigger) {\r\n          realPopupTrigger.click();\r\n        } else {\r\n          window.open(\r\n            'https:\/\/www.cnspd.com\/contact\/',\r\n            '_blank',\r\n            'noopener'\r\n          );\r\n        }\r\n      });\r\n    });\r\n  });\r\n  <\/script>\r\n\r\n<\/article>\t\t\t\t<\/div>\n\t\t\t\t<\/div>\n\t\t\t\t\t<\/div>\n\t\t\t\t<\/div>\n\t\t\t\t<\/div>\n\t\t","protected":false},"excerpt":{"rendered":"<p>A marine automatic transfer switch can be considered when a low-voltage load needs to transfer automatically between two AC sources such as shore power and a generator. For a vessel, port-equipment panel or marine auxiliary system, however, choosing the ATS by ampere rating alone is not enough. Voltage, frequency, poles, neutral arrangement, transfer method, protection&#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-31581","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>Marine Automatic Transfer Switch | Shore Power &amp; Generator ATS Guide<\/title>\n<meta name=\"description\" content=\"Learn how to evaluate a compact marine automatic transfer switch for shore power and generator systems, including 2P\/4P selection, neutral switching, open transition, environmental conditions and marine approval 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\/marine-automatic-transfer-switch\/\" \/>\n<meta property=\"og:locale\" content=\"id_ID\" \/>\n<meta property=\"og:type\" content=\"article\" \/>\n<meta property=\"og:title\" content=\"Marine Automatic Transfer Switch | Shore Power &amp; Generator ATS Guide\" \/>\n<meta property=\"og:description\" content=\"Learn how to evaluate a compact marine automatic transfer switch for shore power and generator systems, including 2P\/4P selection, neutral switching, open transition, environmental conditions and marine approval requirements.\" \/>\n<meta property=\"og:url\" content=\"https:\/\/www.cnspd.com\/id\/marine-automatic-transfer-switch\/\" \/>\n<meta property=\"og:site_name\" content=\"Surge Protector, Surge Arrestor, Isolating Switch - LEEYEE\" \/>\n<meta property=\"article:published_time\" content=\"2026-10-09T05:29:42+00:00\" \/>\n<meta property=\"article:modified_time\" content=\"2026-10-09T05:29:56+00:00\" \/>\n<meta property=\"og:image\" content=\"https:\/\/www.cnspd.com\/wp-content\/uploads\/2026\/09\/marine-ats-shore-power-generator-system-diagram.webp\" \/>\n<meta name=\"author\" content=\"Devin Ling\" \/>\n<meta name=\"twitter:card\" content=\"summary_large_image\" \/>\n<meta name=\"twitter:label1\" content=\"Ditulis oleh\" \/>\n\t<meta name=\"twitter:data1\" content=\"Devin Ling\" \/>\n\t<meta name=\"twitter:label2\" content=\"Estimasi waktu membaca\" \/>\n\t<meta name=\"twitter:data2\" content=\"12 menit\" \/>\n<script type=\"application\/ld+json\" class=\"yoast-schema-graph\">{\"@context\":\"https:\\\/\\\/schema.org\",\"@graph\":[{\"@type\":\"Article\",\"@id\":\"https:\\\/\\\/www.cnspd.com\\\/marine-automatic-transfer-switch\\\/#article\",\"isPartOf\":{\"@id\":\"https:\\\/\\\/www.cnspd.com\\\/marine-automatic-transfer-switch\\\/\"},\"author\":{\"name\":\"Devin Ling\",\"@id\":\"https:\\\/\\\/www.cnspd.com\\\/#\\\/schema\\\/person\\\/f49dbafe62c5b47100ad2d9f88af92d3\"},\"headline\":\"Marine Automatic Transfer Switch: Shore Power &#038; 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