{"id":29669,"date":"2026-06-30T15:20:56","date_gmt":"2026-06-30T07:20:56","guid":{"rendered":"https:\/\/www.cnspd.com\/?p=29669"},"modified":"2026-07-01T11:09:00","modified_gmt":"2026-07-01T03:09:00","slug":"common-spd-uc-and-mcov-ratings-150v-275v-320v-385v-440v-and-480v","status":"publish","type":"post","link":"https:\/\/www.cnspd.com\/de\/common-spd-uc-mcov-ratings\/","title":{"rendered":"\u00dcbliche SPD Uc und MCOV-Bewertungen: 150V, 275V, 320V, 385V, 440V und 480V"},"content":{"rendered":"\t\t<div data-elementor-type=\"wp-post\" data-elementor-id=\"29669\" class=\"elementor elementor-29669\" data-elementor-post-type=\"post\">\n\t\t\t\t<div class=\"elementor-element elementor-element-3d39964 e-flex e-con-boxed e-con e-parent\" data-id=\"3d39964\" 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-b7224f9 elementor-widget elementor-widget-html\" data-id=\"b7224f9\" 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16px !important;\r\n    }\r\n\r\n    .cn-faq summary {\r\n      font-size: 16px;\r\n      line-height: 1.45;\r\n      padding-right: 24px;\r\n    }\r\n\r\n    .cn-related ul {\r\n      padding-left: 18px;\r\n    }\r\n\r\n    .cn-related span {\r\n      font-size: 14.5px;\r\n    }\r\n  }\r\n<\/style>\r\n\r\n<article class=\"cn-article\">\r\n\r\n  <div class=\"cn-article-label\">Rating Guide<\/div>\r\n\r\n  <p class=\"cn-article-intro\">\r\n    SPD Uc and MCOV values such as 150V, 275V, 320V, 385V, 440V, and 480V are common in catalogues and datasheets.\r\n    This guide explains what these ratings usually mean, where buyers often see them, and why they should not be treated as fixed country rules.\r\n  <\/p>\r\n\r\n  <div class=\"cn-article-meta\">\r\n    <span>For catalogue comparison<\/span>\r\n    <span>For IEC and UL-style documents<\/span>\r\n    <span>For OEM buyers<\/span>\r\n    <span>Reading time: 7\u20139 minutes<\/span>\r\n  <\/div>\r\n\r\n  <div class=\"cn-note\">\r\n    <p>\r\n      <strong>Quick answer:<\/strong> Uc and MCOV are continuous voltage ratings, not surge current ratings.\r\n      A rating such as 275V, 385V, or 480V tells buyers the maximum continuous voltage the SPD protection mode is designed to withstand.\r\n      It does not, by itself, confirm whether the SPD is suitable for a specific project, country, earthing system, or certification route.\r\n    <\/p>\r\n  <\/div>\r\n\r\n  <nav class=\"cn-toc\">\r\n    <div class=\"cn-toc-title\">In this guide<\/div>\r\n    <ol>\r\n      <li><a href=\"#not-selection-page\">What this page explains<\/a><\/li>\r\n      <li><a href=\"#common-ratings\">Common SPD Uc and MCOV rating values<\/a><\/li>\r\n      <li><a href=\"#uc-mcov-meaning\">What Uc and MCOV mean on datasheets<\/a><\/li>\r\n      <li><a href=\"#catalogue-values\">How to read catalogue rating values<\/a><\/li>\r\n      <li><a href=\"#rating-checks\">What buyers should confirm before ordering<\/a><\/li>\r\n      <li><a href=\"#mistakes\">Common mistakes<\/a><\/li>\r\n      <li><a href=\"#faq\">FAQ<\/a><\/li>\r\n    <\/ol>\r\n  <\/nav>\r\n\r\n  <section id=\"not-selection-page\">\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\/common-spd-uc-mcov-ratings\/#what-this-page-explains\" >What This Page Explains<\/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\/common-spd-uc-mcov-ratings\/#common-spd-uc-and-mcov-rating-values\" >Common SPD Uc and MCOV Rating Values<\/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\/common-spd-uc-mcov-ratings\/#what-uc-and-mcov-mean-on-spd-datasheets\" >What Uc and MCOV Mean on SPD Datasheets<\/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\/common-spd-uc-mcov-ratings\/#how-to-read-catalogue-rating-values\" >How to Read Catalogue Rating Values<\/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\/common-spd-uc-mcov-ratings\/#what-buyers-should-confirm-before-ordering\" >What Buyers Should Confirm Before Ordering<\/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\/common-spd-uc-mcov-ratings\/#common-mistakes-when-comparing-uc-and-mcov-ratings\" >Common Mistakes When Comparing Uc and MCOV Ratings<\/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\/common-spd-uc-mcov-ratings\/#faq-common-spd-uc-and-mcov-ratings\" >FAQ: Common SPD Uc and MCOV Ratings<\/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\/common-spd-uc-mcov-ratings\/#related-spd-uc-mcov-guides\" >Related SPD Uc \/ MCOV Guides<\/a><\/li><\/ul><\/nav><\/div>\n<h2><span class=\"ez-toc-section\" id=\"what-this-page-explains\"><\/span>What This Page Explains<span class=\"ez-toc-section-end\"><\/span><\/h2>\r\n\r\n    <p>\r\n      This article explains common SPD Uc and MCOV rating values from a catalogue and market-facing point of view.\r\n      It helps buyers understand why they often see values such as 150V, 275V, 320V, 385V, 440V, and 480V in AC SPD documents.\r\n    <\/p>\r\n\r\n    <p>\r\n      It is not a project-specific selection calculation page.\r\n      If you need to calculate SPD Uc for TN, TT, IT, or split-phase systems, use the calculation guide linked at the end of this article.\r\n      If you need to choose between 275V, 320V, 385V, and 440V for distribution boards, use the dedicated selection guide.\r\n    <\/p>\r\n\r\n    <div class=\"cn-warning\">\r\n      <p>\r\n        <strong>Important:<\/strong> the values below are common catalogue references.\r\n        They are not fixed country rules, and they should not replace the approved SPD datasheet, local electrical design, earthing system review, or certification requirement.\r\n      <\/p>\r\n    <\/div>\r\n  <\/section>\r\n\r\n  <section id=\"common-ratings\">\r\n    <h2><span class=\"ez-toc-section\" id=\"common-spd-uc-and-mcov-rating-values\"><\/span>Common SPD Uc and MCOV Rating Values<span class=\"ez-toc-section-end\"><\/span><\/h2>\r\n\r\n    <p>\r\n      The table below gives a practical overview of common Uc and MCOV rating ranges.\r\n      The exact value depends on the product family, standard, service voltage, protection mode, and target market.\r\n    <\/p>\r\n\r\n    <div class=\"cn-table-wrap cn-mobile-hide-table\">\r\n      <table class=\"cn-table\">\r\n        <thead>\r\n          <tr>\r\n            <th>Common rating<\/th>\r\n            <th>Where buyers often see it<\/th>\r\n            <th>What it usually indicates<\/th>\r\n            <th>What to check<\/th>\r\n          <\/tr>\r\n        <\/thead>\r\n        <tbody>\r\n          <tr>\r\n            <td>150V \/ 175V<\/td>\r\n            <td>UL-style low-voltage documents and 120V-class systems.<\/td>\r\n            <td>Often linked with lower service-voltage applications, depending on system configuration.<\/td>\r\n            <td>Confirm service voltage, split-phase arrangement, MCOV marking, and certification status.<\/td>\r\n          <\/tr>\r\n          <tr>\r\n            <td>255V \/ 275V<\/td>\r\n            <td>IEC-style 230\/400V low-voltage AC SPD catalogues.<\/td>\r\n            <td>Common for stable 230V line-to-neutral applications and standard distribution boards.<\/td>\r\n            <td>Confirm earthing system, connection mode, grid stability, and Up value.<\/td>\r\n          <\/tr>\r\n          <tr>\r\n            <td>320V<\/td>\r\n            <td>Export panels, markets with moderate voltage fluctuation, or product families needing more margin.<\/td>\r\n            <td>A higher continuous voltage margin than 275V in some 230\/400V applications.<\/td>\r\n            <td>Confirm whether higher Uc changes the voltage protection level and application suitability.<\/td>\r\n          <\/tr>\r\n          <tr>\r\n            <td>385V<\/td>\r\n            <td>Industrial panels, less stable grids, generator-fed systems, and some export catalogues.<\/td>\r\n            <td>A commonly checked value where the operating voltage may run high or TOV risk is considered.<\/td>\r\n            <td>Confirm protected equipment sensitivity, SPD type, Up, and datasheet approval.<\/td>\r\n          <\/tr>\r\n          <tr>\r\n            <td>440V \/ 480V<\/td>\r\n            <td>Higher-voltage AC systems, 480V-class markets, or special industrial applications.<\/td>\r\n            <td>Used where the SPD protection mode must withstand a higher continuous service voltage.<\/td>\r\n            <td>Confirm service voltage, line-to-line or line-to-ground reference, MCOV or Uc marking, and local requirement.<\/td>\r\n          <\/tr>\r\n          <tr>\r\n            <td>550V and above<\/td>\r\n            <td>Special AC systems, industrial applications, and specific product families.<\/td>\r\n            <td>May be used for higher-voltage or special-purpose SPD applications.<\/td>\r\n            <td>Do not use by assumption. Confirm the exact product datasheet, standard, and project design.<\/td>\r\n          <\/tr>\r\n        <\/tbody>\r\n      <\/table>\r\n    <\/div>\r\n\r\n    <div class=\"cn-mobile-rating-cards\">\r\n      <div class=\"cn-mobile-rating-card\">\r\n        <strong>150V \/ 175V<\/strong>\r\n        <h3>Lower service-voltage applications<\/h3>\r\n        <p>Often seen in UL-style low-voltage documents and 120V-class systems.<\/p>\r\n        <div class=\"cn-mobile-watch\">Check service voltage, split-phase arrangement, MCOV marking, and certification status.<\/div>\r\n      <\/div>\r\n\r\n      <div class=\"cn-mobile-rating-card\">\r\n        <strong>255V \/ 275V<\/strong>\r\n        <h3>Standard 230\/400V IEC-style catalogues<\/h3>\r\n        <p>Common for stable 230V line-to-neutral applications and standard distribution boards.<\/p>\r\n        <div class=\"cn-mobile-watch\">Check earthing system, connection mode, grid stability, and Up value.<\/div>\r\n      <\/div>\r\n\r\n      <div class=\"cn-mobile-rating-card\">\r\n        <strong>320V<\/strong>\r\n        <h3>Moderate voltage margin<\/h3>\r\n        <p>Often seen in export panels or markets where buyers want more continuous voltage margin than 275V.<\/p>\r\n        <div class=\"cn-mobile-watch\">Check whether higher Uc changes the protection level or application suitability.<\/div>\r\n      <\/div>\r\n\r\n      <div class=\"cn-mobile-rating-card\">\r\n        <strong>385V<\/strong>\r\n        <h3>Industrial or less stable grids<\/h3>\r\n        <p>Often checked where the operating voltage may run high or temporary overvoltage risk is considered.<\/p>\r\n        <div class=\"cn-mobile-watch\">Check protected equipment sensitivity, SPD type, Up, and datasheet approval.<\/div>\r\n      <\/div>\r\n\r\n      <div class=\"cn-mobile-rating-card\">\r\n        <strong>440V \/ 480V<\/strong>\r\n        <h3>Higher-voltage AC systems<\/h3>\r\n        <p>Used where the SPD protection mode must withstand a higher continuous service voltage.<\/p>\r\n        <div class=\"cn-mobile-watch\">Check line-to-line or line-to-ground reference, Uc or MCOV marking, and local requirement.<\/div>\r\n      <\/div>\r\n\r\n      <div class=\"cn-mobile-rating-card\">\r\n        <strong>550V+<\/strong>\r\n        <h3>Special AC applications<\/h3>\r\n        <p>May appear in special product families or higher-voltage industrial applications.<\/p>\r\n        <div class=\"cn-mobile-watch\">Do not use by assumption. Confirm the exact datasheet and project design.<\/div>\r\n      <\/div>\r\n    <\/div>\r\n  <\/section>\r\n\r\n  <section id=\"uc-mcov-meaning\">\r\n    <h2><span class=\"ez-toc-section\" id=\"what-uc-and-mcov-mean-on-spd-datasheets\"><\/span>What Uc and MCOV Mean on SPD Datasheets<span class=\"ez-toc-section-end\"><\/span><\/h2>\r\n\r\n    <p>\r\n      In IEC-style SPD datasheets, buyers usually see <strong>Uc<\/strong>, or maximum continuous operating voltage.\r\n      In UL-style documents, buyers usually see <strong>MCOV<\/strong>, or maximum continuous operating voltage.\r\n      Both terms help buyers check whether an SPD can remain connected to the real service voltage without abnormal continuous stress.\r\n    <\/p>\r\n\r\n    <p>\r\n      The wording matters because it is linked to the target market, datasheet style, label wording, and approval route.\r\n      Writing MCOV on a document does not automatically mean the SPD is UL listed.\r\n      Certification status must be confirmed separately.\r\n    <\/p>\r\n\r\n    <div class=\"cn-good\">\r\n      <p>\r\n        <strong>Practical rule:<\/strong> read Uc or MCOV together with service voltage, protection mode, earthing system, connection mode, Up, In, Imax, and certification documents.\r\n        Do not judge an SPD only by the catalogue voltage number.\r\n      <\/p>\r\n    <\/div>\r\n  <\/section>\r\n\r\n  <section id=\"catalogue-values\">\r\n    <h2><span class=\"ez-toc-section\" id=\"how-to-read-catalogue-rating-values\"><\/span>How to Read Catalogue Rating Values<span class=\"ez-toc-section-end\"><\/span><\/h2>\r\n\r\n    <p>\r\n      A catalogue value such as 275V or 385V does not mean the SPD is only for one country.\r\n      It also does not mean the same rating can be copied into every system with a similar nominal voltage.\r\n    <\/p>\r\n\r\n    <p>\r\n      The rating must be checked against the voltage that each SPD protection mode will continuously see.\r\n      For example, an SPD connected line-to-neutral is not reviewed in exactly the same way as one connected line-to-earth, neutral-to-earth, or in a 3+1 configuration.\r\n    <\/p>\r\n\r\n    <div class=\"cn-table-wrap\">\r\n      <table class=\"cn-table\">\r\n        <thead>\r\n          <tr>\r\n            <th>What buyers see<\/th>\r\n            <th>What it does not prove<\/th>\r\n            <th>What to confirm instead<\/th>\r\n          <\/tr>\r\n        <\/thead>\r\n        <tbody>\r\n          <tr>\r\n            <td>275V printed in a catalogue<\/td>\r\n            <td>It does not prove the SPD is suitable for every 230\/400V project.<\/td>\r\n            <td>Check earthing system, connection mode, grid condition, and datasheet.<\/td>\r\n          <\/tr>\r\n          <tr>\r\n            <td>385V printed on a model code<\/td>\r\n            <td>It does not prove the SPD gives better protection than a lower Uc option.<\/td>\r\n            <td>Check Up, protected equipment sensitivity, and continuous voltage margin.<\/td>\r\n          <\/tr>\r\n          <tr>\r\n            <td>480V MCOV in a UL-style file<\/td>\r\n            <td>It does not prove the product is UL listed by itself.<\/td>\r\n            <td>Check certification file, marking requirement, and service voltage.<\/td>\r\n          <\/tr>\r\n          <tr>\r\n            <td>Same rating from different suppliers<\/td>\r\n            <td>It does not prove the products have the same performance.<\/td>\r\n            <td>Compare Up, In, Imax, SCCR\/Isccr, SPD type, test report, and construction.<\/td>\r\n          <\/tr>\r\n        <\/tbody>\r\n      <\/table>\r\n    <\/div>\r\n  <\/section>\r\n\r\n  <section id=\"rating-checks\">\r\n    <h2><span class=\"ez-toc-section\" id=\"what-buyers-should-confirm-before-ordering\"><\/span>What Buyers Should Confirm Before Ordering<span class=\"ez-toc-section-end\"><\/span><\/h2>\r\n\r\n    <p>\r\n      Uc and MCOV are important, but they are only one part of SPD selection.\r\n      Before confirming an order, buyers should check the rating together with the real system and documentation requirement.\r\n    <\/p>\r\n\r\n    <div class=\"cn-checklist\">\r\n      <ul>\r\n        <li>Target market: IEC-style, UL-style, GB\/T-style, or local export project.<\/li>\r\n        <li>Service voltage: 120V, 230\/400V, 400\/415V, 480V, or other system voltage.<\/li>\r\n        <li>Protection mode: L-N, L-PE, N-PE, line-to-ground, 3+1, 4P, or another arrangement.<\/li>\r\n        <li>Earthing system: TN-S, TN-C-S, TT, IT, split-phase, or project-specific system.<\/li>\r\n        <li>Uc or MCOV value shown on the label and datasheet.<\/li>\r\n        <li>Voltage protection level Up and downstream equipment sensitivity.<\/li>\r\n        <li>SPD type, discharge current ratings, and backup protection requirement.<\/li>\r\n        <li>Certification status, test report, and approved product family.<\/li>\r\n        <li>OEM model code, packaging wording, and datasheet language.<\/li>\r\n      <\/ul>\r\n    <\/div>\r\n\r\n    <div class=\"cn-cta\">\r\n      <div class=\"cn-cta-title\">Need help comparing SPD voltage ratings?<\/div>\r\n      <p>\r\n        Send us your target market, service voltage, required Uc or MCOV value, and datasheet requirement.\r\n        We can help check whether the rating wording and product documents are aligned before OEM production or bulk ordering.\r\n      <\/p>\r\n      <a class=\"cn-btn leeyee-site-popup-btn\" href=\"javascript:void(0);\">\r\n        <span>Check SPD Rating Requirement<\/span>\r\n      <\/a>\r\n    <\/div>\r\n  <\/section>\r\n\r\n  <section id=\"mistakes\">\r\n    <h2><span class=\"ez-toc-section\" id=\"common-mistakes-when-comparing-uc-and-mcov-ratings\"><\/span>Common Mistakes When Comparing Uc and MCOV Ratings<span class=\"ez-toc-section-end\"><\/span><\/h2>\r\n\r\n    <h3>Mistake 1: Treating the rating as the nominal system voltage<\/h3>\r\n    <p>\r\n      Uc or MCOV is not the same as the nominal system voltage.\r\n      It is the maximum continuous voltage applied to the SPD protection mode.\r\n      The rating must be higher than the normal continuous voltage the SPD may see.\r\n    <\/p>\r\n\r\n    <h3>Mistake 2: Thinking a higher rating is always better<\/h3>\r\n    <p>\r\n      A higher Uc or MCOV gives more continuous voltage margin, but it may also affect the voltage protection level.\r\n      Buyers should compare the rating with Up and the equipment being protected.\r\n    <\/p>\r\n\r\n    <h3>Mistake 3: Comparing only the voltage number<\/h3>\r\n    <p>\r\n      Two SPDs with the same Uc or MCOV can still have different discharge current ratings, protection levels, certifications, internal construction, and application limits.\r\n    <\/p>\r\n\r\n    <h3>Mistake 4: Assuming MCOV wording means UL approval<\/h3>\r\n    <p>\r\n      MCOV is common in UL-style documents, but wording alone is not certification.\r\n      Buyers must check the actual listing, test report, approval status, and product marking requirement.\r\n    <\/p>\r\n\r\n    <h3>Mistake 5: Using AC Uc \/ MCOV values for DC or solar PV SPD<\/h3>\r\n    <p>\r\n      This article explains common AC SPD Uc and MCOV values.\r\n      Solar PV and DC SPD selection uses Ucpv and different system logic.\r\n      Do not copy AC rating values into DC or PV applications.\r\n    <\/p>\r\n  <\/section>\r\n\r\n  <section id=\"faq\">\r\n    <h2><span class=\"ez-toc-section\" id=\"faq-common-spd-uc-and-mcov-ratings\"><\/span>FAQ: Common SPD Uc and MCOV Ratings<span class=\"ez-toc-section-end\"><\/span><\/h2>\r\n\r\n    <div class=\"cn-faq\">\r\n      <details open>\r\n        <summary>Is 275V the same as 230V system voltage?<\/summary>\r\n        <div class=\"cn-faq-body\">\r\n          <p>\r\n            No. 275V is a Uc rating commonly seen in IEC-style AC SPD catalogues.\r\n            It is not the same as the nominal 230V system voltage.\r\n            It should be checked against the actual protection mode, grid condition, earthing system, and datasheet.\r\n          <\/p>\r\n        <\/div>\r\n      <\/details>\r\n\r\n      <details>\r\n        <summary>Why do some catalogues show 255V and others show 275V?<\/summary>\r\n        <div class=\"cn-faq-body\">\r\n          <p>\r\n            Different product families, standards, markets, and design choices may use different catalogue values.\r\n            Buyers should not compare only the number. They should also check Up, In, Imax, SPD type, connection mode, and certification documents.\r\n          <\/p>\r\n        <\/div>\r\n      <\/details>\r\n\r\n      <details>\r\n        <summary>Is 385V SPD better than 275V SPD?<\/summary>\r\n        <div class=\"cn-faq-body\">\r\n          <p>\r\n            Not automatically. A 385V SPD can tolerate a higher continuous voltage, but that does not always mean better protection for sensitive equipment.\r\n            The correct rating depends on the system voltage, grid condition, earthing arrangement, protection mode, and Up value.\r\n          <\/p>\r\n        <\/div>\r\n      <\/details>\r\n\r\n      <details>\r\n        <summary>What does 480V MCOV mean?<\/summary>\r\n        <div class=\"cn-faq-body\">\r\n          <p>\r\n            480V MCOV means the SPD is marked for a maximum continuous operating voltage of 480V in the relevant protection mode or product configuration.\r\n            Buyers still need to confirm service voltage, system configuration, product marking, and certification status.\r\n          <\/p>\r\n        <\/div>\r\n      <\/details>\r\n\r\n      <details>\r\n        <summary>Does MCOV mean the SPD is UL listed?<\/summary>\r\n        <div class=\"cn-faq-body\">\r\n          <p>\r\n            No. MCOV wording is common in UL-style documents, but it does not automatically prove UL listing or approval.\r\n            Certification must be confirmed through the actual approval file, test report, and product marking.\r\n          <\/p>\r\n        <\/div>\r\n      <\/details>\r\n\r\n      <details>\r\n        <summary>Can one Uc or MCOV rating be used for all countries?<\/summary>\r\n        <div class=\"cn-faq-body\">\r\n          <p>\r\n            No. A rating value may appear in many markets, but the final selection depends on service voltage, earthing system, connection mode, temporary overvoltage condition, local requirement, and product datasheet.\r\n          <\/p>\r\n        <\/div>\r\n      <\/details>\r\n\r\n      <details>\r\n        <summary>Are these ratings suitable for solar PV SPD?<\/summary>\r\n        <div class=\"cn-faq-body\">\r\n          <p>\r\n            No. This article is about common AC SPD Uc and MCOV values.\r\n            Solar PV and DC SPDs use Ucpv selection logic and should be reviewed separately.\r\n          <\/p>\r\n        <\/div>\r\n      <\/details>\r\n    <\/div>\r\n  <\/section>\r\n\r\n  <section class=\"cn-related cn-uc-cluster\">\r\n    <h2><span class=\"ez-toc-section\" id=\"related-spd-uc-mcov-guides\"><\/span>Related SPD Uc \/ MCOV Guides<span class=\"ez-toc-section-end\"><\/span><\/h2>\r\n\r\n    <p>\r\n      This article is part of our SPD Uc and MCOV guide series.\r\n      Use the guides below to compare voltage ratings, market terminology, calculation logic, OEM documentation, and country-related system differences.\r\n    <\/p>\r\n\r\n    <ul>\r\n      <li>\r\n        <a href=\"https:\/\/www.cnspd.com\/spd-uc-mcov-selection-across-markets\/\" target=\"_blank\" rel=\"noopener\">\r\n          SPD Uc and MCOV Selection Across IEC, UL and Export Markets\r\n        <\/a>\r\n        <br>\r\n        <span>A full overview of why Uc and MCOV ratings vary across IEC-style, UL-style, GB\/T-style and export markets.<\/span>\r\n      <\/li>\r\n\r\n      <li>\r\n        <a href=\"https:\/\/www.cnspd.com\/spd-uc-selection-guide\/\" target=\"_blank\" rel=\"noopener\">\r\n          SPD Uc Selection Guide for Distribution Boards and OEM Orders\r\n        <\/a>\r\n        <br>\r\n        <span>A practical guide for choosing 275V, 320V, 385V or 440V AC SPD options for panels and OEM orders.<\/span>\r\n      <\/li>\r\n\r\n      <li>\r\n        <a href=\"https:\/\/www.cnspd.com\/spd-uc-calculation-tn-tt-it\/\" target=\"_blank\" rel=\"noopener\">\r\n          SPD Uc Calculation for TN, TT, IT and Split-Phase Systems\r\n        <\/a>\r\n        <br>\r\n        <span>A calculation-focused guide for checking SPD Uc against earthing systems, connection modes and system voltage.<\/span>\r\n      <\/li>\r\n\r\n      <li>\r\n        <a href=\"https:\/\/www.cnspd.com\/spd-uc-vs-mcov-oem-labels\/\" target=\"_blank\" rel=\"noopener\">\r\n          SPD Uc vs MCOV: Difference for OEM Labels and Datasheets\r\n        <\/a>\r\n        <br>\r\n        <span>A guide for OEM buyers who need to align Uc, MCOV, product labels, datasheets, packaging and test files.<\/span>\r\n      <\/li>\r\n\r\n      <li>\r\n        <a href=\"https:\/\/www.cnspd.com\/spd-uc-mcov-ratings-by-country\/\" target=\"_blank\" rel=\"noopener\">\r\n          Why SPD Uc and MCOV Ratings Vary by Country and Power System\r\n        <\/a>\r\n        <br>\r\n        <span>A market-focused guide explaining why common SPD voltage ratings differ between regions, grid systems and project requirements.<\/span>\r\n      <\/li>\r\n    <\/ul>\r\n  <\/section>\r\n\r\n<\/article>\r\n\r\n<script>\r\n  document.addEventListener('DOMContentLoaded', function () {\r\n    document.querySelectorAll('.leeyee-site-popup-btn').forEach(function (btn) {\r\n      btn.addEventListener('click', function (e) {\r\n        e.preventDefault();\r\n        var trigger = document.querySelector('.w-popup.ush_popup_1 .w-popup-trigger');\r\n        if (trigger) {\r\n          trigger.click();\r\n        } else {\r\n          window.open('https:\/\/www.cnspd.com\/contact\/', '_blank');\r\n        }\r\n      });\r\n    });\r\n  });\r\n<\/script>\r\n\r\n<script type=\"application\/ld+json\">\r\n{\r\n  \"@context\": \"https:\/\/schema.org\",\r\n  \"@graph\": [\r\n    {\r\n      \"@type\": \"Article\",\r\n      \"headline\": \"Common SPD Uc and MCOV Ratings: 150V, 275V, 320V, 385V, 440V and 480V\",\r\n      \"description\": \"Understand common SPD Uc and MCOV ratings such as 150V, 275V, 320V, 385V, 440V and 480V. Learn what these values mean in catalogues, IEC-style and UL-style markets.\",\r\n      \"author\": {\r\n        \"@type\": \"Organization\",\r\n        \"name\": \"LEEYEE\"\r\n      },\r\n      \"publisher\": {\r\n        \"@type\": \"Organization\",\r\n        \"name\": \"LEEYEE\",\r\n        \"url\": \"https:\/\/www.cnspd.com\/\"\r\n      },\r\n      \"mainEntityOfPage\": {\r\n        \"@type\": \"WebPage\",\r\n        \"@id\": \"https:\/\/www.cnspd.com\/common-spd-uc-mcov-ratings\/\"\r\n      }\r\n    },\r\n    {\r\n      \"@type\": \"FAQPage\",\r\n      \"mainEntity\": [\r\n        {\r\n          \"@type\": \"Question\",\r\n          \"name\": \"Is 275V the same as 230V system voltage?\",\r\n          \"acceptedAnswer\": {\r\n            \"@type\": \"Answer\",\r\n            \"text\": \"No. 275V is a Uc rating commonly seen in IEC-style AC SPD catalogues. It is not the same as the nominal 230V system voltage. It should be checked against the actual protection mode, grid condition, earthing system, and datasheet.\"\r\n          }\r\n        },\r\n        {\r\n          \"@type\": \"Question\",\r\n          \"name\": \"Why do some catalogues show 255V and others show 275V?\",\r\n          \"acceptedAnswer\": {\r\n            \"@type\": \"Answer\",\r\n            \"text\": \"Different product families, standards, markets, and design choices may use different catalogue values. Buyers should not compare only the number. They should also check Up, In, Imax, SPD type, connection mode, and certification documents.\"\r\n          }\r\n        },\r\n        {\r\n          \"@type\": \"Question\",\r\n          \"name\": \"Is 385V SPD better than 275V SPD?\",\r\n          \"acceptedAnswer\": {\r\n            \"@type\": \"Answer\",\r\n            \"text\": \"Not automatically. A 385V SPD can tolerate a higher continuous voltage, but that does not always mean better protection for sensitive equipment. The correct rating depends on the system voltage, grid condition, earthing arrangement, protection mode, and Up value.\"\r\n          }\r\n        },\r\n        {\r\n          \"@type\": \"Question\",\r\n          \"name\": \"What does 480V MCOV mean?\",\r\n          \"acceptedAnswer\": {\r\n            \"@type\": \"Answer\",\r\n            \"text\": \"480V MCOV means the SPD is marked for a maximum continuous operating voltage of 480V in the relevant protection mode or product configuration. Buyers still need to confirm service voltage, system configuration, product marking, and certification status.\"\r\n          }\r\n        },\r\n        {\r\n          \"@type\": \"Question\",\r\n          \"name\": \"Does MCOV mean the SPD is UL listed?\",\r\n          \"acceptedAnswer\": {\r\n            \"@type\": \"Answer\",\r\n            \"text\": \"No. MCOV wording is common in UL-style documents, but it does not automatically prove UL listing or approval. Certification must be confirmed through the actual approval file, test report, and product marking.\"\r\n          }\r\n        },\r\n        {\r\n          \"@type\": \"Question\",\r\n          \"name\": \"Can one Uc or MCOV rating be used for all countries?\",\r\n          \"acceptedAnswer\": {\r\n            \"@type\": \"Answer\",\r\n            \"text\": \"No. A rating value may appear in many markets, but the final selection depends on service voltage, earthing system, connection mode, temporary overvoltage condition, local requirement, and product datasheet.\"\r\n          }\r\n        },\r\n        {\r\n          \"@type\": \"Question\",\r\n          \"name\": \"Are these ratings suitable for solar PV SPD?\",\r\n          \"acceptedAnswer\": {\r\n            \"@type\": \"Answer\",\r\n            \"text\": \"No. This article is about common AC SPD Uc and MCOV values. Solar PV and DC SPDs use Ucpv selection logic and should be reviewed separately.\"\r\n          }\r\n        }\r\n      ]\r\n    }\r\n  ]\r\n}\r\n<\/script>\t\t\t\t<\/div>\n\t\t\t\t<\/div>\n\t\t\t\t\t<\/div>\n\t\t\t\t<\/div>\n\t\t\t\t<\/div>\n\t\t","protected":false},"excerpt":{"rendered":"<p>Rating GuideSPD Uc and MCOV values such as 150V, 275V, 320V, 385V, 440V, and 480V are common in catalogues and datasheets. This guide explains what these ratings usually mean, where buyers often see them, and why they should not be treated as fixed country rules.For catalogue comparison For IEC and UL-style documents For OEM buyers&#8230;<\/p>","protected":false},"author":18,"featured_media":0,"comment_status":"closed","ping_status":"open","sticky":false,"template":"","format":"standard","meta":{"footnotes":""},"categories":[1,488,422],"tags":[],"class_list":["post-29669","post","type-post","status-publish","format-standard","hentry","category-news","category-surge-protection","category-industry-news"],"acf":[],"yoast_head":"<!-- This site is optimized with the Yoast SEO plugin v27.9 - https:\/\/yoast.com\/product\/yoast-seo-wordpress\/ -->\n<title>Common SPD Uc and MCOV Ratings: 150V to 480V Guide<\/title>\n<meta name=\"description\" content=\"Understand common SPD Uc and MCOV ratings such as 150V, 275V, 320V, 385V, 440V and 480V. 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