{"id":30048,"date":"2026-07-14T15:32:27","date_gmt":"2026-07-14T07:32:27","guid":{"rendered":"https:\/\/www.cnspd.com\/?p=30048"},"modified":"2026-07-14T15:32:27","modified_gmt":"2026-07-14T07:32:27","slug":"mov-vs-gdt-in-surge-protective-devices-differences-applications-and-buyer-guide","status":"publish","type":"post","link":"https:\/\/www.cnspd.com\/de\/mov-spd-vs-gdt-spd\/","title":{"rendered":"MOV vs GDT in Surge Protective Devices: Differences, Applications and Buyer Guide"},"content":{"rendered":"\t\t<div data-elementor-type=\"wp-post\" data-elementor-id=\"30048\" class=\"elementor elementor-30048\" data-elementor-post-type=\"post\">\n\t\t\t\t<div class=\"elementor-element elementor-element-ca75af2 e-flex e-con-boxed e-con e-parent\" data-id=\"ca75af2\" 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-6d8a799 elementor-widget elementor-widget-html\" data-id=\"6d8a799\" 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none;\r\n  }\r\n\r\n  .ly-mvgdt-related strong {\r\n    margin-bottom: 7px;\r\n    color: var(--ly-ink);\r\n    font-size: 16px;\r\n    line-height: 1.4;\r\n  }\r\n\r\n  .ly-mvgdt-related span {\r\n    color: var(--ly-muted);\r\n    font-size: 13px;\r\n    line-height: 1.5;\r\n  }\r\n\r\n  .ly-mvgdt-cta {\r\n    margin: 7px 0 43px;\r\n    padding: 30px;\r\n    border-radius: 16px;\r\n    color: #fff;\r\n    background:\r\n      radial-gradient(\r\n        circle at 90% 15%,\r\n        rgba(255, 255, 255, 0.16),\r\n        transparent 28%\r\n      ),\r\n      linear-gradient(135deg, #063d78 0%, #0055a8 100%);\r\n  }\r\n\r\n  .ly-mvgdt-cta-inner {\r\n    display: flex;\r\n    align-items: center;\r\n    justify-content: space-between;\r\n    gap: 27px;\r\n  }\r\n\r\n  .ly-mvgdt-cta h2 {\r\n    margin: 0 0 8px;\r\n    color: #fff;\r\n    font-size: 27px;\r\n    line-height: 1.3;\r\n  }\r\n\r\n  .ly-mvgdt-cta p {\r\n    max-width: 720px;\r\n    margin: 0;\r\n    color: rgba(255, 255, 255, 0.88);\r\n    font-size: 15px;\r\n  }\r\n\r\n  .ly-mvgdt-btn {\r\n    display: inline-flex;\r\n    flex: 0 0 auto;\r\n    align-items: center;\r\n    justify-content: center;\r\n    min-width: 210px;\r\n    min-height: 50px;\r\n    padding: 13px 21px;\r\n    border: 1px solid #fff;\r\n    border-radius: 8px;\r\n    color: var(--ly-blue-dark) !important;\r\n    background: #fff;\r\n    font-size: 15px;\r\n    font-weight: 700;\r\n    line-height: 1.25;\r\n    text-align: center;\r\n    cursor: pointer;\r\n  }\r\n\r\n  .ly-mvgdt-btn:hover {\r\n    color: #fff !important;\r\n    background: transparent;\r\n    text-decoration: none !important;\r\n  }\r\n\r\n  .ly-mvgdt-btn span {\r\n    display: inline-block;\r\n  }\r\n\r\n  .ly-mvgdt-sources {\r\n    padding: 35px 0 50px;\r\n    border-top: 1px solid var(--ly-line);\r\n  }\r\n\r\n  .ly-mvgdt-sources h2 {\r\n    margin: 0 0 16px;\r\n    color: var(--ly-ink);\r\n    font-size: 26px;\r\n  }\r\n\r\n  .ly-mvgdt-sources ol {\r\n    margin: 0;\r\n    padding-left: 23px;\r\n  }\r\n\r\n  .ly-mvgdt-sources li {\r\n    margin-bottom: 10px;\r\n    padding-left: 5px;\r\n    color: var(--ly-muted);\r\n    font-size: 14px;\r\n    line-height: 1.55;\r\n  }\r\n\r\n  .ly-mvgdt-sources a {\r\n    word-break: break-word;\r\n  }\r\n\r\n  @media (max-width: 1440px) {\r\n    .ly-mvgdt-shell {\r\n      max-width: 1160px;\r\n    }\r\n\r\n    .ly-mvgdt-section h2 {\r\n      font-size: 30px;\r\n    }\r\n  }\r\n\r\n  @media (max-width: 1366px) {\r\n    .ly-mvgdt-shell {\r\n      max-width: 1120px;\r\n    }\r\n\r\n    .ly-mvgdt-intro {\r\n      padding-top: 39px;\r\n    }\r\n\r\n    .ly-mvgdt-mistakes,\r\n    .ly-mvgdt-related {\r\n      gap: 13px;\r\n    }\r\n  }\r\n\r\n  @media (max-width: 1280px) {\r\n    .ly-mvgdt-shell {\r\n      max-width: 1060px;\r\n    }\r\n\r\n    .ly-mvgdt-tech-card,\r\n    .ly-mvgdt-app-card {\r\n      padding: 21px;\r\n    }\r\n\r\n    .ly-mvgdt-figure {\r\n      margin-top: 22px;\r\n      margin-bottom: 30px;\r\n    }\r\n  }\r\n\r\n  @media (max-width: 1024px) {\r\n    .ly-mvgdt-shell {\r\n      width: calc(100% - 40px);\r\n      max-width: 940px;\r\n    }\r\n\r\n    .ly-mvgdt-page {\r\n      font-size: 16px;\r\n    }\r\n\r\n    .ly-mvgdt-lead {\r\n      font-size: 21px;\r\n    }\r\n\r\n    .ly-mvgdt-mistakes {\r\n      grid-template-columns: repeat(2, minmax(0, 1fr));\r\n    }\r\n\r\n    .ly-mvgdt-related {\r\n      grid-template-columns: repeat(2, minmax(0, 1fr));\r\n    }\r\n\r\n    .ly-mvgdt-figure {\r\n      padding: 9px;\r\n      border-radius: 14px;\r\n    }\r\n  }\r\n\r\n  @media (max-width: 912px) {\r\n    .ly-mvgdt-two-col,\r\n    .ly-mvgdt-app-grid {\r\n      grid-template-columns: 1fr;\r\n    }\r\n\r\n    .ly-mvgdt-toc ol {\r\n      columns: 1;\r\n    }\r\n\r\n    .ly-mvgdt-cta-inner {\r\n      align-items: flex-start;\r\n      flex-direction: column;\r\n    }\r\n\r\n    .ly-mvgdt-btn {\r\n      min-width: 220px;\r\n    }\r\n  }\r\n\r\n  @media (max-width: 820px) {\r\n    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24px;\r\n    }\r\n  }\r\n\r\n  @media (max-width: 480px) {\r\n    .ly-mvgdt-shell {\r\n      width: calc(100% - 24px);\r\n    }\r\n\r\n    .ly-mvgdt-eyebrow {\r\n      font-size: 11px;\r\n    }\r\n\r\n    .ly-mvgdt-keywords {\r\n      gap: 7px;\r\n    }\r\n\r\n    .ly-mvgdt-keywords span {\r\n      min-height: 31px;\r\n      padding: 5px 9px;\r\n      font-size: 12px;\r\n    }\r\n\r\n    .ly-mvgdt-callout {\r\n      padding: 18px;\r\n    }\r\n\r\n    .ly-mvgdt-cta {\r\n      margin-bottom: 35px;\r\n      padding: 22px;\r\n    }\r\n\r\n    .ly-mvgdt-sources {\r\n      padding-bottom: 39px;\r\n    }\r\n  }\r\n\r\n  @media (max-width: 430px) {\r\n    .ly-mvgdt-lead {\r\n      font-size: 17.5px;\r\n    }\r\n\r\n    .ly-mvgdt-quick {\r\n      padding: 18px;\r\n    }\r\n\r\n    .ly-mvgdt-quick h2 {\r\n      font-size: 21px;\r\n    }\r\n\r\n    .ly-mvgdt-section h2 {\r\n      font-size: 24px;\r\n    }\r\n\r\n    .ly-mvgdt-tech-card,\r\n    .ly-mvgdt-app-card,\r\n    .ly-mvgdt-mistake {\r\n      padding: 18px;\r\n    }\r\n\r\n    .ly-mvgdt-faq summary {\r\n      padding-left: 17px;\r\n    }\r\n\r\n    .ly-mvgdt-faq-answer {\r\n      padding-right: 17px;\r\n      padding-left: 17px;\r\n    }\r\n\r\n    .ly-mvgdt-figure {\r\n      padding: 6px;\r\n      border-radius: 10px;\r\n    }\r\n  }\r\n\r\n  @media (max-width: 414px) {\r\n    .ly-mvgdt-shell {\r\n      width: calc(100% - 22px);\r\n    }\r\n\r\n    .ly-mvgdt-intro-note {\r\n      font-size: 14px;\r\n    }\r\n\r\n    .ly-mvgdt-toc {\r\n      padding: 18px;\r\n    }\r\n\r\n    .ly-mvgdt-toc h2,\r\n    .ly-mvgdt-review h2 {\r\n      font-size: 20px;\r\n    }\r\n\r\n    .ly-mvgdt-cta p {\r\n      font-size: 14px;\r\n    }\r\n  }\r\n\r\n  @media (max-width: 390px) {\r\n    .ly-mvgdt-section h2 {\r\n      font-size: 23px;\r\n    }\r\n\r\n    .ly-mvgdt-section h3 {\r\n      font-size: 19px;\r\n    }\r\n\r\n    .ly-mvgdt-state-box {\r\n      padding: 15px;\r\n    }\r\n\r\n    .ly-mvgdt-sources li {\r\n      font-size: 13px;\r\n    }\r\n  }\r\n\r\n  @media (max-width: 375px) {\r\n    .ly-mvgdt-shell {\r\n      width: calc(100% - 20px);\r\n    }\r\n\r\n    .ly-mvgdt-quick,\r\n    .ly-mvgdt-toc,\r\n    .ly-mvgdt-rfq {\r\n      border-radius: 11px;\r\n    }\r\n\r\n    .ly-mvgdt-cta {\r\n      border-radius: 13px;\r\n    }\r\n\r\n    .ly-mvgdt-btn {\r\n      min-height: 48px;\r\n      padding-right: 16px;\r\n      padding-left: 16px;\r\n      font-size: 14px;\r\n    }\r\n  }\r\n\r\n  @media (max-width: 360px) {\r\n    .ly-mvgdt-page {\r\n      font-size: 15px;\r\n    }\r\n\r\n    .ly-mvgdt-lead {\r\n      font-size: 17px;\r\n    }\r\n\r\n    .ly-mvgdt-section h2 {\r\n      font-size: 22px;\r\n    }\r\n\r\n    .ly-mvgdt-quick h2 {\r\n      font-size: 20px;\r\n    }\r\n\r\n    .ly-mvgdt-cta h2 {\r\n      font-size: 22px;\r\n    }\r\n  }\r\n\r\n  @media (max-width: 320px) {\r\n    .ly-mvgdt-shell {\r\n      width: calc(100% - 16px);\r\n    }\r\n\r\n    .ly-mvgdt-intro {\r\n      padding-top: 22px;\r\n    }\r\n\r\n    .ly-mvgdt-quick,\r\n    .ly-mvgdt-toc,\r\n    .ly-mvgdt-tech-card,\r\n    .ly-mvgdt-app-card,\r\n    .ly-mvgdt-mistake,\r\n    .ly-mvgdt-rfq,\r\n    .ly-mvgdt-review,\r\n    .ly-mvgdt-cta {\r\n      padding: 16px;\r\n    }\r\n\r\n    .ly-mvgdt-section h2 {\r\n      font-size: 21px;\r\n    }\r\n\r\n    .ly-mvgdt-section h3 {\r\n      font-size: 18px;\r\n    }\r\n\r\n    .ly-mvgdt-faq summary {\r\n      padding-right: 42px;\r\n      font-size: 14px;\r\n    }\r\n\r\n    .ly-mvgdt-figure {\r\n      padding: 5px;\r\n    }\r\n  }\r\n<\/style>\r\n\r\n<article class=\"ly-mvgdt-page\">\r\n  <div class=\"ly-mvgdt-shell\">\r\n\r\n    <section class=\"ly-mvgdt-intro\" aria-labelledby=\"mov-gdt-introduction\">\r\n      <div class=\"ly-mvgdt-eyebrow\">\r\n        SPD Structure and OEM Selection Guide\r\n      <\/div>\r\n\r\n      <p id=\"mov-gdt-introduction\" class=\"ly-mvgdt-lead\">\r\n        MOV and GDT are both used for surge protection, but they operate\r\n        differently. An MOV progressively limits voltage. A GDT or spark\r\n        gap remains highly resistive until sparkover creates a conductive\r\n        discharge path.\r\n      <\/p>\r\n\r\n      <p class=\"ly-mvgdt-intro-note\">\r\n        For engineering and OEM procurement, the real question is not\r\n        simply which component is better. The buyer must determine which\r\n        complete SPD structure matches the application, system voltage,\r\n        protection mode, surge waveform, fault conditions and certification\r\n        requirements.\r\n      <\/p>\r\n\r\n      <div class=\"ly-mvgdt-keywords\" aria-label=\"Topics covered\">\r\n        <span>MOV vs GDT<\/span>\r\n        <span>MOV vs Spark Gap<\/span>\r\n        <span>N-PE Protection<\/span>\r\n        <span>Hybrid SPD<\/span>\r\n        <span>AC and PV DC SPD<\/span>\r\n        <span>Signal SPD<\/span>\r\n        <span>OEM Selection<\/span>\r\n      <\/div>\r\n    <\/section>\r\n\r\n    <section class=\"ly-mvgdt-quick\" aria-labelledby=\"mov-gdt-quick-answer\">\r\n      <div id=\"ez-toc-container\" class=\"ez-toc-v2_0_85 counter-hierarchy ez-toc-counter ez-toc-custom ez-toc-container-direction\">\n<div class=\"ez-toc-title-container\">\n<p class=\"ez-toc-title\" style=\"cursor:inherit\">Table of Contents<\/p>\n<span class=\"ez-toc-title-toggle\"><\/span><\/div>\n<nav><ul class='ez-toc-list ez-toc-list-level-1 ' ><li class='ez-toc-page-1 ez-toc-heading-level-2'><a class=\"ez-toc-link ez-toc-heading-1\" href=\"#\" data-href=\"https:\/\/www.cnspd.com\/de\/mov-spd-vs-gdt-spd\/#quick-answer-what-is-the-difference-between-mov-and-gdt\" >Quick Answer: What Is the Difference Between MOV and GDT?<\/a><\/li><li class='ez-toc-page-1 ez-toc-heading-level-2'><a class=\"ez-toc-link ez-toc-heading-2\" href=\"#\" data-href=\"https:\/\/www.cnspd.com\/de\/mov-spd-vs-gdt-spd\/#mov-vs-gdt-the-core-differences\" >MOV vs GDT: The Core Differences<\/a><\/li><li class='ez-toc-page-1 ez-toc-heading-level-2'><a class=\"ez-toc-link ez-toc-heading-3\" href=\"#\" data-href=\"https:\/\/www.cnspd.com\/de\/mov-spd-vs-gdt-spd\/#which-structure-is-commonly-used-in-each-spd-application\" >Which Structure Is Commonly Used in Each SPD Application?<\/a><\/li><li class='ez-toc-page-1 ez-toc-heading-level-2'><a class=\"ez-toc-link ez-toc-heading-4\" href=\"#\" data-href=\"https:\/\/www.cnspd.com\/de\/mov-spd-vs-gdt-spd\/#leeyee-oem-review-focus\" >LEEYEE OEM Review Focus<\/a><\/li><li class='ez-toc-page-1 ez-toc-heading-level-2'><a class=\"ez-toc-link ez-toc-heading-5\" href=\"#\" data-href=\"https:\/\/www.cnspd.com\/de\/mov-spd-vs-gdt-spd\/#detailed-guide\" >Detailed Guide<\/a><\/li><li class='ez-toc-page-1 ez-toc-heading-level-2'><a class=\"ez-toc-link ez-toc-heading-6\" href=\"#\" data-href=\"https:\/\/www.cnspd.com\/de\/mov-spd-vs-gdt-spd\/#how-does-an-mov-work-inside-a-surge-protective-device\" >How Does an MOV Work Inside a Surge Protective Device?<\/a><\/li><li class='ez-toc-page-1 ez-toc-heading-level-2'><a class=\"ez-toc-link ez-toc-heading-7\" href=\"#\" data-href=\"https:\/\/www.cnspd.com\/de\/mov-spd-vs-gdt-spd\/#how-does-a-gdt-or-spark-gap-work-inside-an-spd\" >How Does a GDT or Spark Gap Work Inside an SPD?<\/a><\/li><li class='ez-toc-page-1 ez-toc-heading-level-2'><a class=\"ez-toc-link ez-toc-heading-8\" href=\"#\" data-href=\"https:\/\/www.cnspd.com\/de\/mov-spd-vs-gdt-spd\/#is-a-gdt-the-same-as-every-power-spark-gap\" >Is a GDT the Same as Every Power Spark Gap?<\/a><\/li><li class='ez-toc-page-1 ez-toc-heading-level-2'><a class=\"ez-toc-link ez-toc-heading-9\" href=\"#\" data-href=\"https:\/\/www.cnspd.com\/de\/mov-spd-vs-gdt-spd\/#response-time-dynamic-sparkover-and-voltage-protection-level\" >Response Time, Dynamic Sparkover and Voltage Protection Level<\/a><\/li><li class='ez-toc-page-1 ez-toc-heading-level-2'><a class=\"ez-toc-link ez-toc-heading-10\" href=\"#\" data-href=\"https:\/\/www.cnspd.com\/de\/mov-spd-vs-gdt-spd\/#why-do-many-n-pe-modules-use-spark-gap-technology\" >Why Do Many N-PE Modules Use Spark-Gap Technology?<\/a><\/li><li class='ez-toc-page-1 ez-toc-heading-level-2'><a class=\"ez-toc-link ez-toc-heading-11\" href=\"#\" data-href=\"https:\/\/www.cnspd.com\/de\/mov-spd-vs-gdt-spd\/#how-mov-and-gdt-structures-differ-by-spd-application\" >How MOV and GDT Structures Differ by SPD 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\/de\/mov-spd-vs-gdt-spd\/#why-are-mov-and-gdt-sometimes-combined\" >Why Are MOV and GDT Sometimes Combined?<\/a><\/li><li class='ez-toc-page-1 ez-toc-heading-level-2'><a class=\"ez-toc-link ez-toc-heading-13\" href=\"#\" data-href=\"https:\/\/www.cnspd.com\/de\/mov-spd-vs-gdt-spd\/#mov-vs-gdt-aging-failure-and-safety\" >MOV vs GDT Aging, Failure and Safety<\/a><\/li><li class='ez-toc-page-1 ez-toc-heading-level-2'><a class=\"ez-toc-link ez-toc-heading-14\" href=\"#\" data-href=\"https:\/\/www.cnspd.com\/de\/mov-spd-vs-gdt-spd\/#oem-and-engineering-buyer-checklist\" >OEM and Engineering Buyer Checklist<\/a><\/li><li class='ez-toc-page-1 ez-toc-heading-level-2'><a class=\"ez-toc-link ez-toc-heading-15\" href=\"#\" data-href=\"https:\/\/www.cnspd.com\/de\/mov-spd-vs-gdt-spd\/#six-common-mov-and-gdt-procurement-mistakes\" >Six Common MOV and GDT Procurement Mistakes<\/a><\/li><li class='ez-toc-page-1 ez-toc-heading-level-2'><a class=\"ez-toc-link ez-toc-heading-16\" href=\"#\" data-href=\"https:\/\/www.cnspd.com\/de\/mov-spd-vs-gdt-spd\/#frequently-asked-questions\" >Frequently Asked Questions<\/a><\/li><li class='ez-toc-page-1 ez-toc-heading-level-2'><a class=\"ez-toc-link ez-toc-heading-17\" href=\"#\" data-href=\"https:\/\/www.cnspd.com\/de\/mov-spd-vs-gdt-spd\/#related-leeyee-technical-guides\" >Related LEEYEE Technical Guides<\/a><\/li><li class='ez-toc-page-1 ez-toc-heading-level-2'><a class=\"ez-toc-link ez-toc-heading-18\" href=\"#\" data-href=\"https:\/\/www.cnspd.com\/de\/mov-spd-vs-gdt-spd\/#need-to-confirm-the-right-spd-structure-for-an-oem-order\" >Need to Confirm the Right SPD Structure for an OEM Order?<\/a><\/li><li class='ez-toc-page-1 ez-toc-heading-level-2'><a class=\"ez-toc-link ez-toc-heading-19\" href=\"#\" data-href=\"https:\/\/www.cnspd.com\/de\/mov-spd-vs-gdt-spd\/#authoritative-references\" >Authoritative References<\/a><\/li><\/ul><\/nav><\/div>\n<h2 id=\"mov-gdt-quick-answer\"><span class=\"ez-toc-section\" id=\"quick-answer-what-is-the-difference-between-mov-and-gdt\"><\/span>\r\n        Quick Answer: What Is the Difference Between MOV and GDT?\r\n      <span class=\"ez-toc-section-end\"><\/span><\/h2>\r\n\r\n      <p>\r\n        <strong>MOVs are voltage-limiting components.<\/strong>\r\n        Their resistance decreases progressively as voltage rises. They are\r\n        widely used in AC Type 2 SPDs, PV DC SPDs and other power-protection\r\n        circuits because they provide compact and predictable\r\n        voltage-limiting behavior.\r\n      <\/p>\r\n\r\n      <p>\r\n        <strong>\r\n          GDTs and power spark gaps are voltage-switching components.\r\n        <\/strong>\r\n        They remain highly resistive during normal operation and switch into\r\n        a conductive discharge state after sparkover. They are useful where\r\n        very low leakage, low capacitance or high normal-state insulation is\r\n        required.\r\n      <\/p>\r\n\r\n      <p>\r\n        <strong>Neither technology is automatically better.<\/strong>\r\n        Compare the complete SPD's Uc or Ucpv, Up, Iimp, In, Imax,\r\n        protection mode, follow-current behavior, disconnection structure,\r\n        short-circuit capability and certification.\r\n        <sup>\r\n          <a class=\"ly-mvgdt-cite\" href=\"#source-1\">[1]<\/a>\r\n        <\/sup>\r\n        <sup>\r\n          <a class=\"ly-mvgdt-cite\" href=\"#source-8\">[8]<\/a>\r\n        <\/sup>\r\n      <\/p>\r\n    <\/section>\r\n\r\n    <figure class=\"ly-mvgdt-figure\">\r\n      <img fetchpriority=\"high\"\r\n        src=\"https:\/\/www.cnspd.com\/wp-content\/uploads\/2026\/07\/mov-vs-gdt-spd-operating-principle.webp\"\r\n        alt=\"MOV voltage-limiting versus GDT voltage-switching operating principle in surge protective devices\"\r\n        width=\"1600\"\r\n        height=\"900\"\r\n        loading=\"eager\"\r\n        fetchpriority=\"high\"\r\n        decoding=\"async\"\r\n      >\r\n      <figcaption>\r\n        <strong>MOV versus GDT operating behavior:<\/strong>\r\n        an MOV progressively limits voltage, while a GDT remains highly\r\n        resistive until its sparkover condition is reached.\r\n      <\/figcaption>\r\n    <\/figure>\r\n\r\n    <section id=\"comparison\" class=\"ly-mvgdt-section\">\r\n      <h2><span class=\"ez-toc-section\" id=\"mov-vs-gdt-the-core-differences\"><\/span>MOV vs GDT: The Core Differences<span class=\"ez-toc-section-end\"><\/span><\/h2>\r\n\r\n      <p>\r\n        The table below gives the direct answer most engineering buyers need\r\n        before reviewing the deeper technical sections.\r\n      <\/p>\r\n\r\n      <p class=\"ly-mvgdt-table-hint\">\r\n        Swipe horizontally to view the complete comparison table.\r\n      <\/p>\r\n\r\n      <div class=\"ly-mvgdt-table-wrap\">\r\n        <table class=\"ly-mvgdt-table\">\r\n          <thead>\r\n            <tr>\r\n              <th>Comparison point<\/th>\r\n              <th>MOV<\/th>\r\n              <th>GDT \/ spark-gap technology<\/th>\r\n              <th>Buyer interpretation<\/th>\r\n            <\/tr>\r\n          <\/thead>\r\n          <tbody>\r\n            <tr>\r\n              <th>Operating principle<\/th>\r\n              <td>Voltage-limiting nonlinear resistance<\/td>\r\n              <td>Voltage-switching after sparkover<\/td>\r\n              <td>\r\n                The two technologies control transient voltage in different\r\n                ways.\r\n              <\/td>\r\n            <\/tr>\r\n            <tr>\r\n              <th>Normal-state leakage<\/th>\r\n              <td>Small leakage current is normally present<\/td>\r\n              <td>Extremely low leakage before sparkover<\/td>\r\n              <td>\r\n                Leakage and insulation can matter in N-PE, signal and\r\n                monitoring applications.\r\n              <\/td>\r\n            <\/tr>\r\n            <tr>\r\n              <th>Voltage behavior<\/th>\r\n              <td>\r\n                Voltage follows the MOV's nonlinear current-voltage curve\r\n              <\/td>\r\n              <td>\r\n                Voltage rises to dynamic sparkover, then falls toward the\r\n                arc-voltage region\r\n              <\/td>\r\n              <td>\r\n                Compare the complete SPD's tested Up, not only the component\r\n                description.\r\n              <\/td>\r\n            <\/tr>\r\n            <tr>\r\n              <th>Response behavior<\/th>\r\n              <td>\r\n                Fast material response, but wiring and inductance still\r\n                affect the result\r\n              <\/td>\r\n              <td>\r\n                Sparkover depends on voltage rise rate and device structure\r\n              <\/td>\r\n              <td>\r\n                Generic nanosecond claims do not replace complete SPD test\r\n                data.\r\n              <\/td>\r\n            <\/tr>\r\n            <tr>\r\n              <th>Surge-current handling<\/th>\r\n              <td>\r\n                Can be high when correctly sized, connected and thermally\r\n                protected\r\n              <\/td>\r\n              <td>\r\n                Can be very high after ignition in a suitably designed\r\n                device\r\n              <\/td>\r\n              <td>\r\n                Always compare the waveform, current per pole and test\r\n                classification.\r\n              <\/td>\r\n            <\/tr>\r\n            <tr>\r\n              <th>Capacitance<\/th>\r\n              <td>Generally higher<\/td>\r\n              <td>Generally very low<\/td>\r\n              <td>\r\n                GDT technology is often useful in high-frequency and signal\r\n                protection.\r\n              <\/td>\r\n            <\/tr>\r\n            <tr>\r\n              <th>Aging<\/th>\r\n              <td>\r\n                Repeated surges, heat and TOV can change leakage and\r\n                varistor characteristics\r\n              <\/td>\r\n              <td>\r\n                Severe discharge duty can erode electrodes or alter\r\n                sparkover behavior\r\n              <\/td>\r\n              <td>\r\n                Neither component family should be described as infinitely\r\n                durable.\r\n              <\/td>\r\n            <\/tr>\r\n            <tr>\r\n              <th>Follow current<\/th>\r\n              <td>\r\n                Does not create the same arc follow-current issue as a\r\n                spark gap\r\n              <\/td>\r\n              <td>\r\n                Power-source current may continue after ignition unless the\r\n                design extinguishes or controls it\r\n              <\/td>\r\n              <td>\r\n                Follow-current performance is critical in power and some DC\r\n                applications.\r\n              <\/td>\r\n            <\/tr>\r\n            <tr>\r\n              <th>Common applications<\/th>\r\n              <td>\r\n                AC Type 2, PV DC and power-input voltage-limiting protection\r\n              <\/td>\r\n              <td>\r\n                N-PE modules, signal primary stages and many Type 1\r\n                lightning-current applications\r\n              <\/td>\r\n              <td>\r\n                These are common uses, not universal rules.\r\n              <\/td>\r\n            <\/tr>\r\n            <tr>\r\n              <th>Main purchasing risk<\/th>\r\n              <td>\r\n                Ignoring TOV, thermal disconnection and end-of-life behavior\r\n              <\/td>\r\n              <td>\r\n                Ignoring dynamic sparkover, front voltage and follow current\r\n              <\/td>\r\n              <td>\r\n                Approve the complete SPD, not only the internal component.\r\n              <\/td>\r\n            <\/tr>\r\n          <\/tbody>\r\n        <\/table>\r\n      <\/div>\r\n    <\/section>\r\n\r\n    <section id=\"which-structure\" class=\"ly-mvgdt-section\">\r\n      <h2><span class=\"ez-toc-section\" id=\"which-structure-is-commonly-used-in-each-spd-application\"><\/span>Which Structure Is Commonly Used in Each SPD Application?<span class=\"ez-toc-section-end\"><\/span><\/h2>\r\n\r\n      <p class=\"ly-mvgdt-table-hint\">\r\n        Swipe horizontally to view the complete application table.\r\n      <\/p>\r\n\r\n      <div class=\"ly-mvgdt-table-wrap\">\r\n        <table class=\"ly-mvgdt-table ly-mvgdt-choice-table\">\r\n          <thead>\r\n            <tr>\r\n              <th>Application<\/th>\r\n              <th>Common structure<\/th>\r\n              <th>Main reason<\/th>\r\n              <th>What to confirm<\/th>\r\n            <\/tr>\r\n          <\/thead>\r\n          <tbody>\r\n            <tr>\r\n              <th>AC Type 2 distribution-board SPD<\/th>\r\n              <td>Frequently MOV-based<\/td>\r\n              <td>Compact voltage-limiting protection<\/td>\r\n              <td>Uc, In, Imax, Up, thermal disconnection and backup device<\/td>\r\n            <\/tr>\r\n            <tr>\r\n              <th>TT 1+1 or 3+1 N-PE path<\/th>\r\n              <td>Frequently spark-gap-based<\/td>\r\n              <td>High N-PE insulation and very low normal leakage<\/td>\r\n              <td>N-PE total current, system topology, Uc and Up<\/td>\r\n            <\/tr>\r\n            <tr>\r\n              <th>Type 1 service entrance<\/th>\r\n              <td>\r\n                Tested spark-gap, MOV or coordinated Type 1 structure\r\n              <\/td>\r\n              <td>Must withstand the declared lightning impulse<\/td>\r\n              <td>Iimp, 10\/350 \u03bcs waveform, Up and follow-current behavior<\/td>\r\n            <\/tr>\r\n            <tr>\r\n              <th>PV DC SPD<\/th>\r\n              <td>\r\n                PV-specific voltage-limiting structures are common\r\n              <\/td>\r\n              <td>Voltage limiting with safe DC fault disconnection<\/td>\r\n              <td>Ucpv, Iscpv, In, Imax or Iimp, Up and certificate scope<\/td>\r\n            <\/tr>\r\n            <tr>\r\n              <th>RS485 or signal SPD<\/th>\r\n              <td>GDT plus coordinated fine protection is common<\/td>\r\n              <td>\r\n                Low capacitance with a lower final residual voltage\r\n              <\/td>\r\n              <td>\r\n                Signal voltage, capacitance, frequency, Up and test category\r\n              <\/td>\r\n            <\/tr>\r\n            <tr>\r\n              <th>Low-leakage hybrid protection<\/th>\r\n              <td>Series GDT-and-MOV structure may be used<\/td>\r\n              <td>\r\n                The GDT can isolate the MOV from continuous operating voltage\r\n              <\/td>\r\n              <td>\r\n                MCOV, front protection voltage, clamping behavior and testing\r\n              <\/td>\r\n            <\/tr>\r\n          <\/tbody>\r\n        <\/table>\r\n      <\/div>\r\n\r\n      <div class=\"ly-mvgdt-review\">\r\n        <div class=\"ly-mvgdt-review-mark\" aria-hidden=\"true\">\u2713<\/div>\r\n        <div>\r\n          <h2><span class=\"ez-toc-section\" id=\"leeyee-oem-review-focus\"><\/span>LEEYEE OEM Review Focus<span class=\"ez-toc-section-end\"><\/span><\/h2>\r\n          <p>\r\n            For project matching, the review should begin with system\r\n            voltage, earthing arrangement, protection mode and applicable\r\n            SPD classification. Internal MOV, GDT or spark-gap technology\r\n            is then evaluated together with Up, surge-current waveform,\r\n            fault behavior, disconnection, product label and certificate\r\n            scope.\r\n          <\/p>\r\n        <\/div>\r\n      <\/div>\r\n    <\/section>\r\n\r\n    <nav class=\"ly-mvgdt-toc\" aria-label=\"Table of contents\">\r\n      <h2><span class=\"ez-toc-section\" id=\"detailed-guide\"><\/span>Detailed Guide<span class=\"ez-toc-section-end\"><\/span><\/h2>\r\n      <ol>\r\n        <li>\r\n          <a href=\"#mov-operation\">How an MOV works inside an SPD<\/a>\r\n        <\/li>\r\n        <li>\r\n          <a href=\"#gdt-operation\">How a GDT or spark gap works<\/a>\r\n        <\/li>\r\n        <li>\r\n          <a href=\"#gdt-vs-spark-gap\">\r\n            GDT versus power spark-gap structures\r\n          <\/a>\r\n        <\/li>\r\n        <li>\r\n          <a href=\"#response-time\">\r\n            Response time, sparkover and Up\r\n          <\/a>\r\n        <\/li>\r\n        <li>\r\n          <a href=\"#npe\">\r\n            Why N-PE modules use spark-gap technology\r\n          <\/a>\r\n        <\/li>\r\n        <li>\r\n          <a href=\"#applications\">\r\n            AC, PV DC and signal SPD applications\r\n          <\/a>\r\n        <\/li>\r\n        <li>\r\n          <a href=\"#hybrid\">MOV and GDT hybrid protection<\/a>\r\n        <\/li>\r\n        <li>\r\n          <a href=\"#failure\">Aging, failure and safety<\/a>\r\n        <\/li>\r\n        <li>\r\n          <a href=\"#buyer-checklist\">OEM buyer checklist<\/a>\r\n        <\/li>\r\n        <li>\r\n          <a href=\"#mistakes\">Common procurement mistakes<\/a>\r\n        <\/li>\r\n        <li>\r\n          <a href=\"#faq\">Frequently asked questions<\/a>\r\n        <\/li>\r\n      <\/ol>\r\n    <\/nav>\r\n\r\n    <section id=\"mov-operation\" class=\"ly-mvgdt-section\">\r\n      <h2><span class=\"ez-toc-section\" id=\"how-does-an-mov-work-inside-a-surge-protective-device\"><\/span>How Does an MOV Work Inside a Surge Protective Device?<span class=\"ez-toc-section-end\"><\/span><\/h2>\r\n\r\n      <div class=\"ly-mvgdt-two-col\">\r\n        <div class=\"ly-mvgdt-tech-card\">\r\n          <h3>MOV: Voltage-Limiting Behavior<\/h3>\r\n\r\n          <p>\r\n            MOV means metal oxide varistor. Its resistance changes\r\n            nonlinearly with applied voltage. At normal system voltage, the\r\n            component remains at high resistance and carries a small leakage\r\n            current. As transient voltage rises, resistance falls and surge\r\n            current is diverted through the protection path.\r\n          <\/p>\r\n\r\n          <div class=\"ly-mvgdt-state\" aria-label=\"MOV operating states\">\r\n            <div class=\"ly-mvgdt-state-box\">\r\n              <strong>Normal voltage<\/strong>\r\n              <span>\r\n                High resistance with a small standby leakage current.\r\n              <\/span>\r\n            <\/div>\r\n\r\n            <div class=\"ly-mvgdt-arrow\" aria-hidden=\"true\">\u2192<\/div>\r\n\r\n            <div class=\"ly-mvgdt-state-box\">\r\n              <strong>Surge voltage<\/strong>\r\n              <span>\r\n                Resistance decreases progressively and voltage is limited.\r\n              <\/span>\r\n            <\/div>\r\n          <\/div>\r\n        <\/div>\r\n\r\n        <div class=\"ly-mvgdt-tech-card\">\r\n          <h3>A Bare MOV Is Not a Complete SPD<\/h3>\r\n\r\n          <p>\r\n            A practical power SPD also depends on thermal disconnection,\r\n            internal conductor layout, insulation, status indication,\r\n            terminals, enclosure construction and coordination with\r\n            integrated or external backup protection.\r\n          <\/p>\r\n\r\n          <p>\r\n            Repeated surge stress, excessive operating voltage, heat or TOV\r\n            can increase MOV leakage and temperature. Safe disconnection and\r\n            clear end-of-life indication are therefore important parts of\r\n            the complete design.\r\n            <sup>\r\n              <a class=\"ly-mvgdt-cite\" href=\"#source-10\">[10]<\/a>\r\n            <\/sup>\r\n          <\/p>\r\n        <\/div>\r\n      <\/div>\r\n\r\n      <div class=\"ly-mvgdt-callout\">\r\n        <strong>Buyer interpretation<\/strong>\r\n        <p>\r\n          The number or diameter of MOV discs does not prove complete SPD\r\n          performance. Material formulation, connection method, thermal\r\n          control, conductor dimensions and complete-product testing all\r\n          affect the result.\r\n        <\/p>\r\n      <\/div>\r\n    <\/section>\r\n\r\n    <section id=\"gdt-operation\" class=\"ly-mvgdt-section\">\r\n      <h2><span class=\"ez-toc-section\" id=\"how-does-a-gdt-or-spark-gap-work-inside-an-spd\"><\/span>How Does a GDT or Spark Gap Work Inside an SPD?<span class=\"ez-toc-section-end\"><\/span><\/h2>\r\n\r\n      <div class=\"ly-mvgdt-two-col\">\r\n        <div class=\"ly-mvgdt-tech-card gdt\">\r\n          <h3>GDT: Voltage-Switching Behavior<\/h3>\r\n\r\n          <p>\r\n            A gas discharge tube contains two or three electrodes in a\r\n            sealed enclosure with a controlled gas mixture. At normal\r\n            voltage, the gap is non-conductive and provides very high\r\n            insulation resistance. When the transient reaches its dynamic\r\n            sparkover condition, the gas ionizes and creates a conductive\r\n            discharge path.\r\n          <\/p>\r\n\r\n          <div class=\"ly-mvgdt-state\" aria-label=\"GDT operating states\">\r\n            <div class=\"ly-mvgdt-state-box\">\r\n              <strong>Normal voltage<\/strong>\r\n              <span>\r\n                Open-like state with extremely low leakage and capacitance.\r\n              <\/span>\r\n            <\/div>\r\n\r\n            <div class=\"ly-mvgdt-arrow\" aria-hidden=\"true\">\u2192<\/div>\r\n\r\n            <div class=\"ly-mvgdt-state-box\">\r\n              <strong>After sparkover<\/strong>\r\n              <span>\r\n                The ionized gap becomes a low-voltage discharge path.\r\n              <\/span>\r\n            <\/div>\r\n          <\/div>\r\n        <\/div>\r\n\r\n        <div class=\"ly-mvgdt-tech-card gdt\">\r\n          <h3>The Follow-Current Question<\/h3>\r\n\r\n          <p>\r\n            Once a power spark gap has ignited, the connected source may\r\n            continue supplying current through the conductive path after the\r\n            original transient has passed. This is known as follow current.\r\n          <\/p>\r\n\r\n          <p>\r\n            The complete power SPD must extinguish, interrupt or safely\r\n            coordinate this current. High impulse-current capability alone\r\n            does not prove suitability for every AC or DC source.\r\n          <\/p>\r\n        <\/div>\r\n      <\/div>\r\n\r\n      <p>\r\n        IEC 61643-312 defines the characteristics and applications of GDT\r\n        components, while specifically distinguishing those components from\r\n        the complete requirements of a finished SPD.\r\n        <sup>\r\n          <a class=\"ly-mvgdt-cite\" href=\"#source-7\">[7]<\/a>\r\n        <\/sup>\r\n      <\/p>\r\n    <\/section>\r\n\r\n    <section id=\"gdt-vs-spark-gap\" class=\"ly-mvgdt-section\">\r\n      <h2><span class=\"ez-toc-section\" id=\"is-a-gdt-the-same-as-every-power-spark-gap\"><\/span>Is a GDT the Same as Every Power Spark Gap?<span class=\"ez-toc-section-end\"><\/span><\/h2>\r\n\r\n      <p>\r\n        No. A GDT is one type of gas-filled voltage-switching component, but\r\n        the term spark gap covers a wider range of structures.\r\n      <\/p>\r\n\r\n      <ul class=\"ly-mvgdt-list\">\r\n        <li>\r\n          A discrete GDT is normally a compact sealed component with two or\r\n          three electrodes.\r\n        <\/li>\r\n        <li>\r\n          A power SPD may use larger encapsulated, triggered, carbon,\r\n          graphite or multi-electrode spark-gap structures.\r\n        <\/li>\r\n        <li>\r\n          Type 1 spark-gap modules may include dedicated arc chambers,\r\n          triggering systems and follow-current-extinguishing structures.\r\n        <\/li>\r\n      <\/ul>\r\n\r\n      <div class=\"ly-mvgdt-callout warning\">\r\n        <strong>Better specification language<\/strong>\r\n        <p>\r\n          Instead of asking only whether an SPD contains a GDT, ask whether\r\n          the protection path is voltage-limiting or voltage-switching, what\r\n          impulse waveform applies, what follow-current behavior is declared\r\n          and how the complete SPD was tested.\r\n        <\/p>\r\n      <\/div>\r\n    <\/section>\r\n\r\n    <section id=\"response-time\" class=\"ly-mvgdt-section\">\r\n      <h2><span class=\"ez-toc-section\" id=\"response-time-dynamic-sparkover-and-voltage-protection-level\"><\/span>Response Time, Dynamic Sparkover and Voltage Protection Level<span class=\"ez-toc-section-end\"><\/span><\/h2>\r\n\r\n      <p>\r\n        Many component comparisons claim that an MOV is faster and a GDT is\r\n        slower. That statement is too simple for complete SPD selection.\r\n      <\/p>\r\n\r\n      <p>\r\n        A GDT's dynamic sparkover voltage depends partly on the voltage rise\r\n        rate. A steep transient can create a brief front voltage before the\r\n        conductive discharge state is established. Series GDT-and-MOV\r\n        structures may therefore have a front protection voltage that must\r\n        be considered during coordination.\r\n        <sup>\r\n          <a class=\"ly-mvgdt-cite\" href=\"#source-11\">[11]<\/a>\r\n        <\/sup>\r\n      <\/p>\r\n\r\n      <p>\r\n        MOV behavior is also affected by lead length, internal conductor\r\n        inductance, current amplitude and test waveform. The voltage\r\n        appearing at the equipment is the result of the complete SPD and\r\n        installation, not a generic component response-time number.\r\n      <\/p>\r\n\r\n      <div class=\"ly-mvgdt-callout success\">\r\n        <strong>What the buyer should compare<\/strong>\r\n        <p>\r\n          Use the declared voltage protection level Up, the applicable\r\n          impulse waveform, protection mode and installation requirements.\r\n          Do not approve an SPD from an advertised nanosecond value alone.\r\n        <\/p>\r\n      <\/div>\r\n    <\/section>\r\n\r\n    <section id=\"npe\" class=\"ly-mvgdt-section\">\r\n      <h2><span class=\"ez-toc-section\" id=\"why-do-many-n-pe-modules-use-spark-gap-technology\"><\/span>Why Do Many N-PE Modules Use Spark-Gap Technology?<span class=\"ez-toc-section-end\"><\/span><\/h2>\r\n\r\n      <p>\r\n        In TT systems and some TN-S arrangements, 1+1 or 3+1 topologies are\r\n        commonly used. Phase conductors are protected toward neutral through\r\n        voltage-limiting paths, while neutral is connected to protective\r\n        earth through a voltage-switching N-PE module.\r\n      <\/p>\r\n\r\n      <div class=\"ly-mvgdt-two-col\">\r\n        <div class=\"ly-mvgdt-tech-card\">\r\n          <h3>Typical 1+1 Arrangement<\/h3>\r\n          <ul class=\"ly-mvgdt-list\">\r\n            <li>L-N: commonly an MOV-based voltage-limiting path<\/li>\r\n            <li>N-PE: commonly a spark-gap-based switching path<\/li>\r\n            <li>\r\n              Used in suitable single-phase TT and TN-S applications\r\n            <\/li>\r\n          <\/ul>\r\n        <\/div>\r\n\r\n        <div class=\"ly-mvgdt-tech-card gdt\">\r\n          <h3>Typical 3+1 Arrangement<\/h3>\r\n          <ul class=\"ly-mvgdt-list\">\r\n            <li>L1\/L2\/L3-N: commonly MOV-based protection paths<\/li>\r\n            <li>\r\n              N-PE: one high-capacity voltage-switching protection path\r\n            <\/li>\r\n            <li>\r\n              Used in suitable three-phase TT and TN-S applications\r\n            <\/li>\r\n          <\/ul>\r\n        <\/div>\r\n      <\/div>\r\n\r\n      <p>\r\n        The N-PE switching path maintains high insulation and very low\r\n        leakage during normal operation. During a surge, it carries the\r\n        combined impulse current from neutral toward the protective bonding\r\n        system.\r\n        <sup>\r\n          <a class=\"ly-mvgdt-cite\" href=\"#source-14\">[14]<\/a>\r\n        <\/sup>\r\n      <\/p>\r\n\r\n      <div class=\"ly-mvgdt-callout warning\">\r\n        <strong>Check the N-PE module separately<\/strong>\r\n        <p>\r\n          Confirm whether the stated value is total current, current per\r\n          protection mode or current per pole. Products with similar 1+1 or\r\n          3+1 labels can have different N-PE discharge capacities.\r\n        <\/p>\r\n      <\/div>\r\n    <\/section>\r\n\r\n    <section id=\"applications\" class=\"ly-mvgdt-section\">\r\n      <h2><span class=\"ez-toc-section\" id=\"how-mov-and-gdt-structures-differ-by-spd-application\"><\/span>How MOV and GDT Structures Differ by SPD Application<span class=\"ez-toc-section-end\"><\/span><\/h2>\r\n\r\n      <figure class=\"ly-mvgdt-figure\">\r\n        <img loading=\"lazy\"\r\n          src=\"https:\/\/www.cnspd.com\/wp-content\/uploads\/2026\/07\/mov-gdt-structures-ac-npe-signal-spd.webp\"\r\n          alt=\"Common MOV GDT and spark gap structures in AC SPD N-PE protection and signal SPD\"\r\n          width=\"1600\"\r\n          height=\"900\"\r\n          loading=\"lazy\"\r\n          decoding=\"async\"\r\n        >\r\n        <figcaption>\r\n          <strong>Typical application structures:<\/strong>\r\n          MOV-based AC protection, MOV plus N-PE spark-gap protection, and\r\n          coordinated GDT plus fine protection in signal circuits.\r\n        <\/figcaption>\r\n      <\/figure>\r\n\r\n      <div class=\"ly-mvgdt-app-grid\">\r\n        <div class=\"ly-mvgdt-app-card\">\r\n          <span class=\"ly-mvgdt-app-label\">AC Power SPD<\/span>\r\n          <h3>Distribution Boards and Control Panels<\/h3>\r\n          <p>\r\n            MOV-based structures are common in Type 2 AC SPDs because they\r\n            provide compact voltage-limiting protection for\r\n            distribution-level surge currents.\r\n          <\/p>\r\n          <ul>\r\n            <li>Confirm Uc, In, Imax and Up.<\/li>\r\n            <li>Check thermal disconnection and backup protection.<\/li>\r\n            <li>Match the protection mode to the earthing system.<\/li>\r\n          <\/ul>\r\n        <\/div>\r\n\r\n        <div class=\"ly-mvgdt-app-card\">\r\n          <span class=\"ly-mvgdt-app-label\">Type 1 SPD<\/span>\r\n          <h3>Lightning-Current Entry Points<\/h3>\r\n          <p>\r\n            Type 1 products can use purpose-designed spark gaps, MOV\r\n            assemblies or coordinated structures. Type 1 classification is\r\n            based on complete-product testing, not the component name.\r\n          <\/p>\r\n          <ul>\r\n            <li>Verify Iimp with the 10\/350 \u03bcs waveform.<\/li>\r\n            <li>Confirm Up and current per pole.<\/li>\r\n            <li>Check follow-current and downstream coordination.<\/li>\r\n          <\/ul>\r\n        <\/div>\r\n\r\n        <div class=\"ly-mvgdt-app-card\">\r\n          <span class=\"ly-mvgdt-app-label\">PV DC SPD<\/span>\r\n          <h3>Combiner Boxes and Solar Inverters<\/h3>\r\n          <p>\r\n            Voltage-limiting varistor structures are common in PV DC SPDs,\r\n            but the important question is whether the complete device can\r\n            safely disconnect under DC overload and fault conditions.\r\n          <\/p>\r\n          <ul>\r\n            <li>Confirm Ucpv, Iscpv, In, Imax or Iimp and Up.<\/li>\r\n            <li>Check polarity and PV-specific failure behavior.<\/li>\r\n            <li>Verify the certificate scope against the ordered model.<\/li>\r\n          <\/ul>\r\n        <\/div>\r\n\r\n        <div class=\"ly-mvgdt-app-card\">\r\n          <span class=\"ly-mvgdt-app-label\">Signal SPD<\/span>\r\n          <h3>RS485, Telecom and PLC Interfaces<\/h3>\r\n          <p>\r\n            GDTs are often used as a low-capacitance high-energy primary\r\n            stage. A coordinated TVS or other fine-protection stage can then\r\n            limit the remaining voltage close to sensitive electronics.\r\n          <\/p>\r\n          <ul>\r\n            <li>Confirm signal voltage and maximum operating voltage.<\/li>\r\n            <li>Check capacitance, frequency and insertion loss.<\/li>\r\n            <li>\r\n              Verify common-mode and differential-mode protection.\r\n            <\/li>\r\n          <\/ul>\r\n        <\/div>\r\n      <\/div>\r\n\r\n      <p>\r\n        AC power, PV DC and telecommunications or signalling SPDs are\r\n        covered by different product requirements. A component-level\r\n        comparison therefore cannot replace application-specific\r\n        complete-product selection.\r\n        <sup>\r\n          <a class=\"ly-mvgdt-cite\" href=\"#source-2\">[2]<\/a>\r\n        <\/sup>\r\n        <sup>\r\n          <a class=\"ly-mvgdt-cite\" href=\"#source-4\">[4]<\/a>\r\n        <\/sup>\r\n        <sup>\r\n          <a class=\"ly-mvgdt-cite\" href=\"#source-6\">[6]<\/a>\r\n        <\/sup>\r\n      <\/p>\r\n    <\/section>\r\n\r\n    <section id=\"hybrid\" class=\"ly-mvgdt-section\">\r\n      <h2><span class=\"ez-toc-section\" id=\"why-are-mov-and-gdt-sometimes-combined\"><\/span>Why Are MOV and GDT Sometimes Combined?<span class=\"ez-toc-section-end\"><\/span><\/h2>\r\n\r\n      <p>\r\n        MOV and GDT technologies can be connected in series or coordinated\r\n        in a multi-stage circuit. The goal is to combine useful\r\n        characteristics, not simply to add their current ratings together.\r\n      <\/p>\r\n\r\n      <h3>Series GDT-and-MOV Protection<\/h3>\r\n\r\n      <p>\r\n        In a series hybrid, the GDT can isolate the MOV from continuous\r\n        system voltage during normal operation. This can reduce standby\r\n        leakage through the MOV and reduce continuous electrical stress.\r\n        After sparkover, the MOV contributes voltage-limiting behavior.\r\n        <sup>\r\n          <a class=\"ly-mvgdt-cite\" href=\"#source-12\">[12]<\/a>\r\n        <\/sup>\r\n        <sup>\r\n          <a class=\"ly-mvgdt-cite\" href=\"#source-13\">[13]<\/a>\r\n        <\/sup>\r\n      <\/p>\r\n\r\n      <h3>Coordinated Signal Protection<\/h3>\r\n\r\n      <p>\r\n        A GDT can handle the higher-energy incoming surge, while a\r\n        downstream suppressor limits the remaining transient near the\r\n        protected interface. A coordination element may be needed so the\r\n        primary stage operates before the fine-protection stage is\r\n        overloaded.\r\n      <\/p>\r\n\r\n      <div class=\"ly-mvgdt-callout danger\">\r\n        <strong>A hybrid label is not proof of better performance<\/strong>\r\n        <p>\r\n          Check MCOV or operating voltage, front protection voltage,\r\n          clamping behavior, leakage, current waveform and complete-product\r\n          testing. Incorrectly coordinated components can still provide poor\r\n          protection.\r\n        <\/p>\r\n      <\/div>\r\n    <\/section>\r\n\r\n    <section id=\"failure\" class=\"ly-mvgdt-section\">\r\n      <h2><span class=\"ez-toc-section\" id=\"mov-vs-gdt-aging-failure-and-safety\"><\/span>MOV vs GDT Aging, Failure and Safety<span class=\"ez-toc-section-end\"><\/span><\/h2>\r\n\r\n      <div class=\"ly-mvgdt-two-col\">\r\n        <div class=\"ly-mvgdt-tech-card\">\r\n          <h3>MOV Stress and End of Life<\/h3>\r\n          <p>\r\n            Repeated impulses, high ambient temperature, excessive\r\n            continuous voltage and TOV can change MOV characteristics.\r\n            Leakage and self-heating may increase, making thermal\r\n            disconnection and status indication important.\r\n          <\/p>\r\n        <\/div>\r\n\r\n        <div class=\"ly-mvgdt-tech-card gdt\">\r\n          <h3>GDT and Spark-Gap Wear<\/h3>\r\n          <p>\r\n            Severe discharge duty can erode electrodes or change sparkover\r\n            characteristics. Power spark-gap designs must also control arc\r\n            extinction, follow current and insulation after operation.\r\n          <\/p>\r\n        <\/div>\r\n      <\/div>\r\n\r\n      <p>\r\n        The safety of the finished product also depends on internal\r\n        disconnectors, backup protection, insulation distances, terminals,\r\n        enclosure material, indicator systems and short-circuit withstand.\r\n      <\/p>\r\n\r\n      <div class=\"ly-mvgdt-callout\">\r\n        <strong>Complete-product approval<\/strong>\r\n        <p>\r\n          An MOV, GDT or thermal-protector component certificate does not\r\n          prove that the assembled DIN-rail SPD complies with the applicable\r\n          complete-product standard.\r\n        <\/p>\r\n      <\/div>\r\n    <\/section>\r\n\r\n    <section id=\"buyer-checklist\" class=\"ly-mvgdt-section\">\r\n      <h2><span class=\"ez-toc-section\" id=\"oem-and-engineering-buyer-checklist\"><\/span>OEM and Engineering Buyer Checklist<span class=\"ez-toc-section-end\"><\/span><\/h2>\r\n\r\n      <p>\r\n        Do not begin an RFQ with only \u201cMOV SPD\u201d or \u201cGDT SPD.\u201d Begin with the\r\n        system and required protection performance.\r\n      <\/p>\r\n\r\n      <figure class=\"ly-mvgdt-figure\">\r\n        <img loading=\"lazy\"\r\n          src=\"https:\/\/www.cnspd.com\/wp-content\/uploads\/2026\/07\/mov-gdt-spd-oem-selection-checklist.webp\"\r\n          alt=\"MOV and GDT SPD selection checklist for OEM buyers and engineering procurement\"\r\n          width=\"1600\"\r\n          height=\"900\"\r\n          loading=\"lazy\"\r\n          decoding=\"async\"\r\n        >\r\n        <figcaption>\r\n          <strong>OEM selection process:<\/strong>\r\n          confirm the application, electrical system, complete SPD ratings,\r\n          safety structure and certificate scope before considering the\r\n          internal component technology.\r\n        <\/figcaption>\r\n      <\/figure>\r\n\r\n      <ol class=\"ly-mvgdt-checklist\">\r\n        <li>\r\n          <strong>Application:<\/strong>\r\n          AC distribution, PV DC, telecom, industrial signal, control panel\r\n          or equipment-level protection.\r\n        <\/li>\r\n        <li>\r\n          <strong>System voltage:<\/strong>\r\n          nominal voltage, maximum continuous voltage and frequency where\r\n          applicable.\r\n        <\/li>\r\n        <li>\r\n          <strong>Earthing system:<\/strong>\r\n          TT, TN-S, TN-C, IT, floating DC or grounded DC.\r\n        <\/li>\r\n        <li>\r\n          <strong>SPD category:<\/strong>\r\n          Type 1, Type 2, Type 1+2, Type 3, PV SPD or signal SPD.\r\n        <\/li>\r\n        <li>\r\n          <strong>Protection mode:<\/strong>\r\n          L-N, L-PE, N-PE, L-L, positive-negative or conductor-earth.\r\n        <\/li>\r\n        <li>\r\n          <strong>Voltage ratings:<\/strong>\r\n          Uc, Ucpv, MCOV and declared Up.\r\n        <\/li>\r\n        <li>\r\n          <strong>Current ratings:<\/strong>\r\n          Iimp, In and Imax with the applicable 10\/350 \u03bcs or 8\/20 \u03bcs\r\n          waveform.\r\n        <\/li>\r\n        <li>\r\n          <strong>Fault behavior:<\/strong>\r\n          short-circuit rating, Iscpv, follow-current control and backup\r\n          protective device.\r\n        <\/li>\r\n        <li>\r\n          <strong>Safety structure:<\/strong>\r\n          thermal disconnection, arc control, insulation, indication and\r\n          remote contact.\r\n        <\/li>\r\n        <li>\r\n          <strong>Certification:<\/strong>\r\n          complete-model test report, certificate scope, standard edition\r\n          and matching product label.\r\n        <\/li>\r\n        <li>\r\n          <strong>Mechanical requirements:<\/strong>\r\n          pole configuration, DIN width, terminals and replacement-module\r\n          compatibility.\r\n        <\/li>\r\n        <li>\r\n          <strong>OEM requirements:<\/strong>\r\n          logo, model code, label, packaging, manual, barcode and batch\r\n          traceability.\r\n        <\/li>\r\n      <\/ol>\r\n\r\n      <div class=\"ly-mvgdt-rfq\">\r\n        <h3>Recommended RFQ Information<\/h3>\r\n\r\n        <div class=\"ly-mvgdt-rfq-grid\">\r\n          <div class=\"ly-mvgdt-rfq-item\">\r\n            <strong>Application<\/strong>\r\n            <span>Example: three-phase TT distribution board<\/span>\r\n          <\/div>\r\n\r\n          <div class=\"ly-mvgdt-rfq-item\">\r\n            <strong>Required topology<\/strong>\r\n            <span>Example: 3+1 with an N-PE switching path<\/span>\r\n          <\/div>\r\n\r\n          <div class=\"ly-mvgdt-rfq-item\">\r\n            <strong>System voltage<\/strong>\r\n            <span>Example: 230\/400 V AC, 50 Hz<\/span>\r\n          <\/div>\r\n\r\n          <div class=\"ly-mvgdt-rfq-item\">\r\n            <strong>SPD category<\/strong>\r\n            <span>Example: Type 2 or Type 1+2<\/span>\r\n          <\/div>\r\n\r\n          <div class=\"ly-mvgdt-rfq-item\">\r\n            <strong>Electrical ratings<\/strong>\r\n            <span>Uc, Up, In, Imax and Iimp where required<\/span>\r\n          <\/div>\r\n\r\n          <div class=\"ly-mvgdt-rfq-item\">\r\n            <strong>Fault coordination<\/strong>\r\n            <span>\r\n              Prospective short-circuit current and backup fuse or MCB\r\n            <\/span>\r\n          <\/div>\r\n\r\n          <div class=\"ly-mvgdt-rfq-item\">\r\n            <strong>Certification market<\/strong>\r\n            <span>Applicable IEC, EN or national requirement<\/span>\r\n          <\/div>\r\n\r\n          <div class=\"ly-mvgdt-rfq-item\">\r\n            <strong>OEM scope<\/strong>\r\n            <span>Logo, label, packaging, manual and annual quantity<\/span>\r\n          <\/div>\r\n        <\/div>\r\n      <\/div>\r\n    <\/section>\r\n\r\n    <section id=\"mistakes\" class=\"ly-mvgdt-section\">\r\n      <h2><span class=\"ez-toc-section\" id=\"six-common-mov-and-gdt-procurement-mistakes\"><\/span>Six Common MOV and GDT Procurement Mistakes<span class=\"ez-toc-section-end\"><\/span><\/h2>\r\n\r\n      <div class=\"ly-mvgdt-mistakes\">\r\n        <div class=\"ly-mvgdt-mistake\">\r\n          <strong>Choosing by component name<\/strong>\r\n          <span>\r\n            \u201cGDT is stronger\u201d or \u201cMOV is faster\u201d does not prove that the\r\n            complete SPD matches the project.\r\n          <\/span>\r\n        <\/div>\r\n\r\n        <div class=\"ly-mvgdt-mistake\">\r\n          <strong>Comparing kA without waveform<\/strong>\r\n          <span>\r\n            A 10\/350 \u03bcs Iimp value cannot be compared directly with an\r\n            8\/20 \u03bcs Imax value.\r\n          <\/span>\r\n        <\/div>\r\n\r\n        <div class=\"ly-mvgdt-mistake\">\r\n          <strong>Assuming every spark gap is a GDT<\/strong>\r\n          <span>\r\n            A purpose-designed Type 1 spark-gap chamber can be very\r\n            different from a discrete telecom GDT.\r\n          <\/span>\r\n        <\/div>\r\n\r\n        <div class=\"ly-mvgdt-mistake\">\r\n          <strong>Ignoring DC source behavior<\/strong>\r\n          <span>\r\n            A GDT suitable for a signal line should not automatically be\r\n            placed across a low-impedance DC power source.\r\n          <\/span>\r\n        <\/div>\r\n\r\n        <div class=\"ly-mvgdt-mistake\">\r\n          <strong>Checking only Imax<\/strong>\r\n          <span>\r\n            Uc, Ucpv, Up, In, TOV, backup protection and short-circuit\r\n            safety can be equally important.\r\n          <\/span>\r\n        <\/div>\r\n\r\n        <div class=\"ly-mvgdt-mistake\">\r\n          <strong>Accepting component certification<\/strong>\r\n          <span>\r\n            Certification for an MOV or GDT does not replace certification\r\n            of the complete SPD model.\r\n          <\/span>\r\n        <\/div>\r\n      <\/div>\r\n    <\/section>\r\n\r\n    <section id=\"faq\" class=\"ly-mvgdt-section\">\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-mvgdt-faq\">\r\n        <details>\r\n          <summary>Is MOV or GDT better for surge protection?<\/summary>\r\n          <div class=\"ly-mvgdt-faq-answer\">\r\n            <p>\r\n              Neither is universally better. MOVs are widely used for\r\n              voltage-limiting power protection. GDTs and spark gaps are\r\n              useful where very low leakage, low capacitance or\r\n              voltage-switching behavior is required. The correct choice\r\n              depends on the complete SPD application and ratings.\r\n            <\/p>\r\n          <\/div>\r\n        <\/details>\r\n\r\n        <details>\r\n          <summary>Is a GDT the same as a spark gap?<\/summary>\r\n          <div class=\"ly-mvgdt-faq-answer\">\r\n            <p>\r\n              A GDT is a sealed gas-filled spark-gap component. However, a\r\n              power SPD may use larger or specially engineered spark-gap\r\n              structures that should not automatically be described as\r\n              ordinary discrete GDTs.\r\n            <\/p>\r\n          <\/div>\r\n        <\/details>\r\n\r\n        <details>\r\n          <summary>Why is a spark gap used between N and PE?<\/summary>\r\n          <div class=\"ly-mvgdt-faq-answer\">\r\n            <p>\r\n              A voltage-switching N-PE module provides high insulation and\r\n              very low leakage during normal operation. During a surge, it\r\n              switches into conduction and carries the combined impulse\r\n              current toward PE.\r\n            <\/p>\r\n          <\/div>\r\n        <\/details>\r\n\r\n        <details>\r\n          <summary>Does a Type 1 SPD always use a spark gap?<\/summary>\r\n          <div class=\"ly-mvgdt-faq-answer\">\r\n            <p>\r\n              No. Type 1 is a complete-product test classification. A Type 1\r\n              product may use spark-gap, MOV or coordinated technologies if\r\n              the finished SPD passes the applicable tests and declares the\r\n              required ratings.\r\n            <\/p>\r\n          <\/div>\r\n        <\/details>\r\n\r\n        <details>\r\n          <summary>Does a Type 2 SPD always use an MOV?<\/summary>\r\n          <div class=\"ly-mvgdt-faq-answer\">\r\n            <p>\r\n              MOV technology is very common in Type 2 power SPDs, but the\r\n              classification is not defined only by the component. Some\r\n              protection modes, especially N-PE paths, may use\r\n              voltage-switching technology.\r\n            <\/p>\r\n          <\/div>\r\n        <\/details>\r\n\r\n        <details>\r\n          <summary>Can MOV and GDT be used together?<\/summary>\r\n          <div class=\"ly-mvgdt-faq-answer\">\r\n            <p>\r\n              Yes. They may be integrated in a series hybrid or coordinated\r\n              in a multi-stage circuit. Front voltage, current sharing,\r\n              leakage and complete-product testing must still be verified.\r\n            <\/p>\r\n          <\/div>\r\n        <\/details>\r\n\r\n        <details>\r\n          <summary>\r\n            What should a buyer compare instead of response time alone?\r\n          <\/summary>\r\n          <div class=\"ly-mvgdt-faq-answer\">\r\n            <p>\r\n              Confirm the complete SPD's Uc or Ucpv, Up, impulse-current\r\n              rating and waveform, protection mode, fault behavior,\r\n              disconnection structure and certification.\r\n            <\/p>\r\n          <\/div>\r\n        <\/details>\r\n      <\/div>\r\n    <\/section>\r\n\r\n    <section class=\"ly-mvgdt-section\">\r\n      <h2><span class=\"ez-toc-section\" id=\"related-leeyee-technical-guides\"><\/span>Related LEEYEE Technical Guides<span class=\"ez-toc-section-end\"><\/span><\/h2>\r\n\r\n      <div class=\"ly-mvgdt-related\">\r\n        <a href=\"https:\/\/www.cnspd.com\/tt-system-spd\/\">\r\n          <strong>TT System SPD Selection Guide<\/strong>\r\n          <span>\r\n            Understand 3+1 topology, N-PE protection and TT-system ordering.\r\n          <\/span>\r\n        <\/a>\r\n\r\n        <a href=\"https:\/\/www.cnspd.com\/single-phase-spd-wiring-diagram\/\">\r\n          <strong>Single-Phase SPD Wiring Guide<\/strong>\r\n          <span>\r\n            Compare 1P+N, 2P, TT and TN-S wiring arrangements.\r\n          <\/span>\r\n        <\/a>\r\n\r\n        <a href=\"https:\/\/www.cnspd.com\/spd-up-voltage-protection-level\/\">\r\n          <strong>SPD Up Protection Level Guide<\/strong>\r\n          <span>\r\n            Learn why the complete voltage protection level matters more\r\n            than component response claims.\r\n          <\/span>\r\n        <\/a>\r\n\r\n        <a href=\"https:\/\/www.cnspd.com\/spd-failure-causes\/\">\r\n          <strong>Common Causes of SPD Failure<\/strong>\r\n          <span>\r\n            Review surge aging, TOV, wiring, grounding and backup-protection\r\n            problems.\r\n          <\/span>\r\n        <\/a>\r\n\r\n        <a href=\"https:\/\/www.cnspd.com\/rs485-spd-guide\/\">\r\n          <strong>RS485 SPD Selection Guide<\/strong>\r\n          <span>\r\n            Select coordinated signal protection for industrial control and\r\n            communication lines.\r\n          <\/span>\r\n        <\/a>\r\n\r\n        <a href=\"https:\/\/www.cnspd.com\/iec-61643-11-vs-iec-61643-31\/\">\r\n          <strong>IEC 61643-11 vs IEC 61643-31<\/strong>\r\n          <span>\r\n            Confirm the appropriate standard scope for AC and photovoltaic\r\n            SPD products.\r\n          <\/span>\r\n        <\/a>\r\n      <\/div>\r\n    <\/section>\r\n\r\n    <section class=\"ly-mvgdt-cta\" aria-labelledby=\"mov-gdt-cta-title\">\r\n      <div class=\"ly-mvgdt-cta-inner\">\r\n        <div>\r\n          <h2 id=\"mov-gdt-cta-title\"><span class=\"ez-toc-section\" id=\"need-to-confirm-the-right-spd-structure-for-an-oem-order\"><\/span>\r\n            Need to Confirm the Right SPD Structure for an OEM Order?\r\n          <span class=\"ez-toc-section-end\"><\/span><\/h2>\r\n          <p>\r\n            Send LEEYEE your system voltage, earthing arrangement, required\r\n            SPD category, current ratings, certification market and\r\n            private-label requirements. We will help identify the parameters\r\n            that should be confirmed before sample approval.\r\n          <\/p>\r\n        <\/div>\r\n\r\n        <a\r\n          href=\"javascript:void(0);\"\r\n          class=\"ly-mvgdt-btn leeyee-site-popup-btn\"\r\n          role=\"button\"\r\n          aria-label=\"Send your SPD requirements\"\r\n        >\r\n          <span>Send Your SPD Requirements<\/span>\r\n        <\/a>\r\n      <\/div>\r\n    <\/section>\r\n\r\n    <section\r\n      class=\"ly-mvgdt-sources\"\r\n      aria-labelledby=\"mov-gdt-sources-title\"\r\n    >\r\n      <h2 id=\"mov-gdt-sources-title\"><span class=\"ez-toc-section\" id=\"authoritative-references\"><\/span>Authoritative References<span class=\"ez-toc-section-end\"><\/span><\/h2>\r\n\r\n      <ol>\r\n        <li id=\"source-1\">\r\n          IEC, \u201cIEC 61643-01:2024 \u2014 Common requirements for low-voltage\r\n          surge protective devices.\u201d\r\n          <a\r\n            href=\"https:\/\/webstore.iec.ch\/en\/publication\/65315\"\r\n            target=\"_blank\"\r\n            rel=\"noopener noreferrer\"\r\n          >\r\n            View IEC publication\r\n          <\/a>\r\n        <\/li>\r\n\r\n        <li id=\"source-2\">\r\n          IEC, \u201cIEC 61643-11:2025 \u2014 SPDs connected to AC low-voltage power\r\n          systems.\u201d\r\n          <a\r\n            href=\"https:\/\/webstore.iec.ch\/en\/publication\/65314\"\r\n            target=\"_blank\"\r\n            rel=\"noopener noreferrer\"\r\n          >\r\n            View IEC publication\r\n          <\/a>\r\n        <\/li>\r\n\r\n        <li id=\"source-3\">\r\n          IEC, \u201cIEC 61643-12:2020 \u2014 Selection and application principles for\r\n          AC power SPDs.\u201d\r\n          <a\r\n            href=\"https:\/\/webstore.iec.ch\/en\/publication\/32531\"\r\n            target=\"_blank\"\r\n            rel=\"noopener noreferrer\"\r\n          >\r\n            View IEC publication\r\n          <\/a>\r\n        <\/li>\r\n\r\n        <li id=\"source-4\">\r\n          IEC, \u201cIEC 61643-31:2018 \u2014 Requirements and test methods for SPDs\r\n          for photovoltaic installations.\u201d\r\n          <a\r\n            href=\"https:\/\/webstore.iec.ch\/en\/publication\/26931\"\r\n            target=\"_blank\"\r\n            rel=\"noopener noreferrer\"\r\n          >\r\n            View IEC publication\r\n          <\/a>\r\n        <\/li>\r\n\r\n        <li id=\"source-5\">\r\n          IEC, \u201cIEC 61643-41:2025 \u2014 SPDs connected to low-voltage DC power\r\n          systems.\u201d\r\n          <a\r\n            href=\"https:\/\/webstore.iec.ch\/en\/publication\/27917\"\r\n            target=\"_blank\"\r\n            rel=\"noopener noreferrer\"\r\n          >\r\n            View IEC publication\r\n          <\/a>\r\n        <\/li>\r\n\r\n        <li id=\"source-6\">\r\n          IEC, \u201cIEC 61643-21:2025 \u2014 SPDs connected to telecommunications and\r\n          signalling networks.\u201d\r\n          <a\r\n            href=\"https:\/\/webstore.iec.ch\/en\/publication\/69085\"\r\n            target=\"_blank\"\r\n            rel=\"noopener noreferrer\"\r\n          >\r\n            View IEC publication\r\n          <\/a>\r\n        <\/li>\r\n\r\n        <li id=\"source-7\">\r\n          IEC, \u201cIEC 61643-312:2013 \u2014 Selection and application principles\r\n          for gas discharge tubes.\u201d\r\n          <a\r\n            href=\"https:\/\/webstore.iec.ch\/en\/publication\/5693\"\r\n            target=\"_blank\"\r\n            rel=\"noopener noreferrer\"\r\n          >\r\n            View IEC publication\r\n          <\/a>\r\n        <\/li>\r\n\r\n        <li id=\"source-8\">\r\n          Phoenix Contact, \u201cSurge protection basics.\u201d\r\n          <a\r\n            href=\"https:\/\/www.phoenixcontact.com\/en-pc\/technologies\/surge-protection-technology\/surge-protection-basics\"\r\n            target=\"_blank\"\r\n            rel=\"noopener noreferrer\"\r\n          >\r\n            View technical information\r\n          <\/a>\r\n        <\/li>\r\n\r\n        <li id=\"source-9\">\r\n          Phoenix Contact, \u201cSpark gap technology.\u201d\r\n          <a\r\n            href=\"https:\/\/www.phoenixcontact.com\/en-pc\/technologies\/surge-protection-technology\/spark-gap-technology\"\r\n            target=\"_blank\"\r\n            rel=\"noopener noreferrer\"\r\n          >\r\n            View technical information\r\n          <\/a>\r\n        <\/li>\r\n\r\n        <li id=\"source-10\">\r\n          Bourns, \u201cTips on Selecting the Right MOV Surge Suppressor.\u201d\r\n          <a\r\n            href=\"https:\/\/www.bourns.com\/docs\/technical-documents\/technical-library\/varistors\/bourns-tips-on-selecting-the-right-mov-surge-suppressor-white-paper.pdf\"\r\n            target=\"_blank\"\r\n            rel=\"noopener noreferrer\"\r\n          >\r\n            View technical paper\r\n          <\/a>\r\n        <\/li>\r\n\r\n        <li id=\"source-11\">\r\n          Bourns, \u201cUnderstanding Front Protection Voltage and Its Effects on\r\n          Surge Protection.\u201d\r\n          <a\r\n            href=\"https:\/\/bourns.com\/docs\/technical-documents\/technical-library\/gas-discharge-tubes\/publications\/bourns_understanding_elusive_vfp_and_effects_on_surge-protection.pdf\"\r\n            target=\"_blank\"\r\n            rel=\"noopener noreferrer\"\r\n          >\r\n            View technical paper\r\n          <\/a>\r\n        <\/li>\r\n\r\n        <li id=\"source-12\">\r\n          Eaton Bussmann, \u201cMOVGT Integrated MOV and GDT Overvoltage\r\n          Protection.\u201d\r\n          <a\r\n            href=\"https:\/\/www.eaton.com\/us\/en-us\/catalog\/electronic-components\/movgt-mov-and-gdt.html\"\r\n            target=\"_blank\"\r\n            rel=\"noopener noreferrer\"\r\n          >\r\n            View technical information\r\n          <\/a>\r\n        <\/li>\r\n\r\n        <li id=\"source-13\">\r\n          Littelfuse, \u201cCombining GDTs and MOVs for Surge Protection of AC\r\n          Power Lines.\u201d\r\n          <a\r\n            href=\"https:\/\/www.littelfuse.com\/assetdocs\/combining-gdts-and-movs-for-surge-protection-of-ac-power-lines-application-note?assetguid=adc64226-819c-44a7-8dfe-dded9966a0bf\"\r\n            target=\"_blank\"\r\n            rel=\"noopener noreferrer\"\r\n          >\r\n            View application note\r\n          <\/a>\r\n        <\/li>\r\n\r\n        <li id=\"source-14\">\r\n          DEHN, \u201cN-PE spark-gap-based lightning current arresters for 1+1\r\n          and 3+1 circuits.\u201d\r\n          <a\r\n            href=\"https:\/\/www.dehn-international.com\/store\/h\/en-DE\/H679\/n-pe-lightning-current-arresters\"\r\n            target=\"_blank\"\r\n            rel=\"noopener noreferrer\"\r\n          >\r\n            View technical information\r\n          <\/a>\r\n        <\/li>\r\n      <\/ol>\r\n    <\/section>\r\n\r\n  <\/div>\r\n<\/article>\r\n\r\n<script>\r\n  document.addEventListener('DOMContentLoaded', function () {\r\n    var aboutPopupButtons = document.querySelectorAll(\r\n      '.leeyee-site-popup-btn'\r\n    );\r\n\r\n    aboutPopupButtons.forEach(function (button) {\r\n      button.addEventListener('click', function (event) {\r\n        event.preventDefault();\r\n\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<!--\r\n  Configure Article or TechArticle schema through the WordPress SEO plugin\r\n  rather than hard-coding duplicate Article schema in this HTML block.\r\n-->\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>SPD Structure and OEM Selection Guide MOV and GDT are both used for surge protection, but they operate differently. An MOV progressively limits voltage. A GDT or spark gap remains highly resistive until sparkover creates a conductive discharge path. For engineering and OEM procurement, the real question is not simply which component is better. The&#8230;<\/p>","protected":false},"author":18,"featured_media":0,"comment_status":"closed","ping_status":"open","sticky":false,"template":"","format":"standard","meta":{"footnotes":""},"categories":[1],"tags":[],"class_list":["post-30048","post","type-post","status-publish","format-standard","hentry","category-news"],"acf":[],"yoast_head":"<!-- This site is optimized with the Yoast SEO plugin v27.9 - https:\/\/yoast.com\/product\/yoast-seo-wordpress\/ -->\n<title>MOV vs GDT in SPDs: Differences, Uses &amp; Buyer Guide | LEEYEE<\/title>\n<meta name=\"description\" content=\"Compare MOV and GDT technologies in surge protective devices, including response, leakage, surge capacity, N-PE, AC, PV and signal applications for OEM buyers.\" \/>\n<meta name=\"robots\" content=\"index, follow, max-snippet:-1, max-image-preview:large, max-video-preview:-1\" \/>\n<link rel=\"canonical\" href=\"https:\/\/www.cnspd.com\/de\/mov-spd-vs-gdt-spd\/\" \/>\n<meta property=\"og:locale\" content=\"de_DE\" \/>\n<meta property=\"og:type\" content=\"article\" \/>\n<meta property=\"og:title\" content=\"MOV vs GDT in SPDs: Differences, Uses &amp; Buyer Guide | LEEYEE\" \/>\n<meta property=\"og:description\" content=\"Compare MOV and GDT technologies in surge protective devices, including response, leakage, surge capacity, N-PE, AC, PV and signal applications for OEM buyers.\" \/>\n<meta property=\"og:url\" content=\"https:\/\/www.cnspd.com\/de\/mov-spd-vs-gdt-spd\/\" \/>\n<meta property=\"og:site_name\" content=\"Surge Protector, Surge Arrestor, Isolating Switch - 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