{"id":29706,"date":"2026-07-01T14:44:14","date_gmt":"2026-07-01T06:44:14","guid":{"rendered":"https:\/\/www.cnspd.com\/?p=29706"},"modified":"2026-07-01T15:09:13","modified_gmt":"2026-07-01T07:09:13","slug":"3pn-spd-vs-4p-spd-for-three-phase-distribution-boards","status":"publish","type":"post","link":"https:\/\/www.cnspd.com\/pt\/3pn-spd-vs-4p-spd\/","title":{"rendered":"SPD 3P+N vs SPD 4P para Quadros de Distribui\u00e7\u00e3o Trif\u00e1sicos"},"content":{"rendered":"\t\t<div data-elementor-type=\"wp-post\" data-elementor-id=\"29706\" class=\"elementor elementor-29706\" data-elementor-post-type=\"post\">\n\t\t\t\t<div class=\"elementor-element elementor-element-935ba04 e-flex e-con-boxed e-con e-parent\" data-id=\"935ba04\" 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-b3140c8 elementor-widget elementor-widget-html\" data-id=\"b3140c8\" data-element_type=\"widget\" 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}\r\n<\/style>\r\n\r\n<article class=\"cnspd-article\">\r\n\r\n  <section class=\"cnspd-intro\">\r\n    <span class=\"cnspd-kicker\">Three-Phase SPD Selection Guide<\/span>\r\n    <p>Not sure whether to order a <strong>3P+N SPD<\/strong> or a <strong>4P SPD<\/strong> for a three-phase distribution board?<\/p>\r\n    <p>This is a common question for panel builders, electrical distributors, OEM buyers, and project engineers. The two products may look similar from the outside. Both can have four modules. Both may be used in three-phase systems with neutral.<\/p>\r\n    <p>But internally, they may use different protection structures. The key difference is not only the number of poles. The key difference is often the protection path between <strong>neutral and earth<\/strong>, also called <strong>N-PE protection<\/strong>.<\/p>\r\n  <\/section>\r\n\r\n  <section class=\"cnspd-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\/pt\/3pn-spd-vs-4p-spd\/#quick-answer-what-is-the-difference-between-3pn-spd-and-4p-spd\" >Quick Answer: What Is the Difference Between 3P+N SPD and 4P SPD?<\/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\/pt\/3pn-spd-vs-4p-spd\/#what-does-3pn-spd-mean\" >What Does 3P+N SPD Mean?<\/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\/pt\/3pn-spd-vs-4p-spd\/#what-does-4p-spd-mean\" >What Does 4P SPD Mean?<\/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\/pt\/3pn-spd-vs-4p-spd\/#3pn-vs-4p-spd-main-comparison\" >3P+N vs 4P SPD: Main Comparison<\/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\/pt\/3pn-spd-vs-4p-spd\/#why-the-n-pe-protection-path-matters\" >Why the N-PE Protection Path Matters<\/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\/pt\/3pn-spd-vs-4p-spd\/#is-3pn-spd-the-same-as-4p-spd\" >Is 3P+N SPD the Same as 4P SPD?<\/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\/pt\/3pn-spd-vs-4p-spd\/#which-spd-should-be-used-in-tt-systems\" >Which SPD Should Be Used in TT Systems?<\/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\/pt\/3pn-spd-vs-4p-spd\/#which-spd-should-be-used-in-tn-s-systems\" >Which SPD Should Be Used in TN-S Systems?<\/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\/pt\/3pn-spd-vs-4p-spd\/#which-spd-should-be-used-in-tn-c-s-systems\" >Which SPD Should Be Used in TN-C-S Systems?<\/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\/pt\/3pn-spd-vs-4p-spd\/#which-spd-should-be-used-in-tn-c-systems\" >Which SPD Should Be Used in TN-C Systems?<\/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\/pt\/3pn-spd-vs-4p-spd\/#selection-table-tt-vs-tn-s-vs-tn-c-s-vs-tn-c\" >Selection Table: TT vs TN-S vs TN-C-S vs TN-C<\/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\/pt\/3pn-spd-vs-4p-spd\/#wiring-difference-3pn-spd-vs-4p-spd\" >Wiring Difference: 3P+N SPD vs 4P SPD<\/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\/pt\/3pn-spd-vs-4p-spd\/#common-applications\" >Common Applications<\/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\/pt\/3pn-spd-vs-4p-spd\/#common-buying-mistakes\" >Common Buying Mistakes<\/a><\/li><li class='ez-toc-page-1 ez-toc-heading-level-2'><a class=\"ez-toc-link ez-toc-heading-15\" href=\"#\" data-href=\"https:\/\/www.cnspd.com\/pt\/3pn-spd-vs-4p-spd\/#how-to-choose-simple-decision-process\" >How to Choose: Simple Decision Process<\/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\/pt\/3pn-spd-vs-4p-spd\/#recommended-selection-for-buyers\" >Recommended Selection for Buyers<\/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\/pt\/3pn-spd-vs-4p-spd\/#before-ordering-checklist\" >Before Ordering Checklist<\/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\/pt\/3pn-spd-vs-4p-spd\/#product-recommendation-direction\" >Product Recommendation Direction<\/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\/pt\/3pn-spd-vs-4p-spd\/#faq\" >FAQ<\/a><\/li><li class='ez-toc-page-1 ez-toc-heading-level-2'><a class=\"ez-toc-link ez-toc-heading-20\" href=\"#\" data-href=\"https:\/\/www.cnspd.com\/pt\/3pn-spd-vs-4p-spd\/#related-reading\" >Related Reading<\/a><\/li><li class='ez-toc-page-1 ez-toc-heading-level-2'><a class=\"ez-toc-link ez-toc-heading-21\" href=\"#\" data-href=\"https:\/\/www.cnspd.com\/pt\/3pn-spd-vs-4p-spd\/#need-help-choosing-3pn-or-4p-spd\" >Need Help Choosing 3P+N or 4P SPD?<\/a><\/li><\/ul><\/nav><\/div>\n<h2><span class=\"ez-toc-section\" id=\"quick-answer-what-is-the-difference-between-3pn-spd-and-4p-spd\"><\/span>Quick Answer: What Is the Difference Between 3P+N SPD and 4P SPD?<span class=\"ez-toc-section-end\"><\/span><\/h2>\r\n\r\n    <div class=\"cnspd-answer-box\">\r\n      <p>A <strong>4P SPD<\/strong> usually refers to a <strong>4+0 structure<\/strong>. In this design, L1-PE, L2-PE, L3-PE, and N-PE protection paths are commonly voltage-limiting paths, often MOV-based.<\/p>\r\n      <p>A <strong>3P+N SPD<\/strong> usually refers to a <strong>3+1 structure<\/strong>. In this design, L1-N, L2-N, and L3-N use MOV protection paths, while the N-PE path often uses a voltage-switching component such as a <strong>GDT or spark gap<\/strong>.<\/p>\r\n    <\/div>\r\n\r\n    <div class=\"cnspd-article-table-wrap\">\r\n      <table>\r\n        <thead>\r\n          <tr>\r\n            <th>Item<\/th>\r\n            <th>3P+N SPD<\/th>\r\n            <th>4P SPD<\/th>\r\n          <\/tr>\r\n        <\/thead>\r\n        <tbody>\r\n          <tr>\r\n            <td>Common structure<\/td>\r\n            <td>3+1<\/td>\r\n            <td>4+0<\/td>\r\n          <\/tr>\r\n          <tr>\r\n            <td>Phase protection<\/td>\r\n            <td>L1-N, L2-N, L3-N MOV paths<\/td>\r\n            <td>L1-PE, L2-PE, L3-PE voltage-limiting paths<\/td>\r\n          <\/tr>\r\n          <tr>\r\n            <td>N-PE protection<\/td>\r\n            <td>Usually GDT \/ spark gap<\/td>\r\n            <td>Usually MOV-based, depending on design<\/td>\r\n          <\/tr>\r\n          <tr>\r\n            <td>Common use<\/td>\r\n            <td>TT, TN-S, TN-C-S after PEN split<\/td>\r\n            <td>TN-S or project-specific designs<\/td>\r\n          <\/tr>\r\n          <tr>\r\n            <td>Buyer warning<\/td>\r\n            <td>Confirm the N-PE module type<\/td>\r\n            <td>Confirm the internal wiring diagram<\/td>\r\n          <\/tr>\r\n        <\/tbody>\r\n      <\/table>\r\n    <\/div>\r\n\r\n    <p><strong>Simple rule:<\/strong> do not choose only by the words \u201c3P+N\u201d or \u201c4P\u201d on the product name. Always check the grounding system and the manufacturer\u2019s wiring diagram.<\/p>\r\n  <\/section>\r\n\r\n  <figure class=\"cnspd-image\">\r\n    <img decoding=\"async\" src=\"https:\/\/www.cnspd.com\/wp-content\/uploads\/2026\/07\/3PN-vs-4P-SPD-comparison.png\" alt=\"3P+N SPD vs 4P SPD internal structure comparison showing 3+1 vs 4+0 protection paths\" loading=\"lazy\" \/>\r\n    <figcaption>3P+N SPD vs 4P SPD: 3+1 vs 4+0 internal structure and typical protection paths.<\/figcaption>\r\n  <\/figure>\r\n\r\n  <h2><span class=\"ez-toc-section\" id=\"what-does-3pn-spd-mean\"><\/span>What Does 3P+N SPD Mean?<span class=\"ez-toc-section-end\"><\/span><\/h2>\r\n  <p>A <strong>3P+N SPD<\/strong> is commonly used for three-phase power systems with neutral.<\/p>\r\n  <p>It is also called a 3PN SPD, 3+1 SPD, three-phase SPD with neutral, or SPD with N-PE protection.<\/p>\r\n  <p>In a typical 3+1 design, the SPD protects:<\/p>\r\n  <ul>\r\n    <li>L1 to N<\/li>\r\n    <li>L2 to N<\/li>\r\n    <li>L3 to N<\/li>\r\n    <li>N to PE<\/li>\r\n  <\/ul>\r\n  <p>The phase paths are usually protected by voltage-limiting components such as MOVs. The N-PE path is often protected by a voltage-switching component such as a GDT or spark gap.<\/p>\r\n  <p>This design is important because the neutral conductor can rise in potential during surge or fault conditions. The N-PE module helps discharge this overvoltage to earth during surge events.<\/p>\r\n\r\n  <h2><span class=\"ez-toc-section\" id=\"what-does-4p-spd-mean\"><\/span>What Does 4P SPD Mean?<span class=\"ez-toc-section-end\"><\/span><\/h2>\r\n  <p>A <strong>4P SPD<\/strong> means four-pole surge protective device.<\/p>\r\n  <p>In many product ranges, a 4P SPD refers to a <strong>4+0 structure<\/strong>. It uses four voltage-limiting protection paths, commonly MOV-based.<\/p>\r\n  <p>A 4P SPD may protect four conductors in a three-phase system with neutral. But the name alone is not enough.<\/p>\r\n  <p>Different manufacturers may use \u201c4P\u201d differently. Some suppliers use 4P for a 4+0 structure. Some buyers use 4P to mean any four-module SPD. In some markets, a 3P+N product may also be called a four-pole SPD because it has four physical modules.<\/p>\r\n\r\n  <div class=\"cnspd-note\">\r\n    <p><strong>Buyer note:<\/strong> before ordering, check the internal circuit diagram. This is more reliable than the pole name.<\/p>\r\n  <\/div>\r\n\r\n  <h2><span class=\"ez-toc-section\" id=\"3pn-vs-4p-spd-main-comparison\"><\/span>3P+N vs 4P SPD: Main Comparison<span class=\"ez-toc-section-end\"><\/span><\/h2>\r\n  <div class=\"cnspd-article-table-wrap\">\r\n    <table>\r\n      <thead>\r\n        <tr>\r\n          <th>Selection Point<\/th>\r\n          <th>3P+N SPD<\/th>\r\n          <th>4P SPD<\/th>\r\n        <\/tr>\r\n      <\/thead>\r\n      <tbody>\r\n        <tr>\r\n          <td>Also called<\/td>\r\n          <td>3PN SPD, 3+1 SPD<\/td>\r\n          <td>4-pole SPD, 4+0 SPD<\/td>\r\n        <\/tr>\r\n        <tr>\r\n          <td>Internal concept<\/td>\r\n          <td>Three phase-to-neutral paths plus one N-PE path<\/td>\r\n          <td>Four voltage-limiting protection paths<\/td>\r\n        <\/tr>\r\n        <tr>\r\n          <td>N-PE protection<\/td>\r\n          <td>Usually voltage-switching<\/td>\r\n          <td>Usually voltage-limiting, depending on design<\/td>\r\n        <\/tr>\r\n        <tr>\r\n          <td>Typical N-PE component<\/td>\r\n          <td>GDT or spark gap<\/td>\r\n          <td>MOV, depending on the manufacturer design<\/td>\r\n        <\/tr>\r\n        <tr>\r\n          <td>Common grounding systems<\/td>\r\n          <td>TT, TN-S, TN-C-S after PEN split<\/td>\r\n          <td>TN-S or project-specific systems<\/td>\r\n        <\/tr>\r\n        <tr>\r\n          <td>Best for<\/td>\r\n          <td>Systems where neutral-to-earth protection matters<\/td>\r\n          <td>Systems where the drawing requires 4+0 protection<\/td>\r\n        <\/tr>\r\n        <tr>\r\n          <td>Main risk if selected wrongly<\/td>\r\n          <td>Wrong N-PE protection design<\/td>\r\n          <td>Wrong earthing connection or unsuitable internal structure<\/td>\r\n        <\/tr>\r\n        <tr>\r\n          <td>Buyer should confirm<\/td>\r\n          <td>N-PE module type<\/td>\r\n          <td>Circuit diagram and application system<\/td>\r\n        <\/tr>\r\n      <\/tbody>\r\n    <\/table>\r\n  <\/div>\r\n\r\n  <h2><span class=\"ez-toc-section\" id=\"why-the-n-pe-protection-path-matters\"><\/span>Why the N-PE Protection Path Matters<span class=\"ez-toc-section-end\"><\/span><\/h2>\r\n  <p>The most important difference is the <strong>N-PE path<\/strong>.<\/p>\r\n  <p>In a three-phase system with neutral, surge voltage may appear not only between phase and neutral. It may also appear between neutral and protective earth.<\/p>\r\n  <p>This is especially important in TT systems and some TN-S or TN-C-S installations.<\/p>\r\n  <p>A 3P+N SPD normally uses a special N-PE module. This module is often a spark gap or GDT. It stays insulated during normal operation and conducts during surge events.<\/p>\r\n  <p>This helps reduce leakage current during normal operation. It also helps handle neutral-to-earth overvoltage during surge conditions.<\/p>\r\n  <p>A 4P SPD may use MOV-based protection on all four paths. This can be suitable for some systems, but it is not automatically better.<\/p>\r\n  <p>The real question is simple:<\/p>\r\n  <div class=\"cnspd-answer-box\">\r\n    <p><strong>What does your system need between N and PE?<\/strong><\/p>\r\n  <\/div>\r\n\r\n  <h2><span class=\"ez-toc-section\" id=\"is-3pn-spd-the-same-as-4p-spd\"><\/span>Is 3P+N SPD the Same as 4P SPD?<span class=\"ez-toc-section-end\"><\/span><\/h2>\r\n  <p>No, not always.<\/p>\r\n  <p>They may look similar. Both may have four modules. Both may be installed in a three-phase distribution board with neutral.<\/p>\r\n  <p>But electrically, they can be different.<\/p>\r\n  <p>A <strong>3P+N SPD<\/strong> usually means a <strong>3+1 circuit<\/strong>. A <strong>4P SPD<\/strong> usually means a <strong>4+0 circuit<\/strong>.<\/p>\r\n  <p>The difference is the fourth protection path.<\/p>\r\n  <p>In a 3P+N SPD, the fourth path is usually N-PE protection with a switching component. In a 4P SPD, the fourth path is usually another voltage-limiting protection path.<\/p>\r\n\r\n  <div class=\"cnspd-warning\">\r\n    <p><strong>Do not ask only:<\/strong> \u201cDo you have 4P SPD?\u201d<\/p>\r\n    <p><strong>Ask instead:<\/strong> \u201cIs this a 4+0 SPD, or is it a 3P+N \/ 3+1 SPD with N-PE spark gap protection?\u201d<\/p>\r\n  <\/div>\r\n\r\n  <h2><span class=\"ez-toc-section\" id=\"which-spd-should-be-used-in-tt-systems\"><\/span>Which SPD Should Be Used in TT Systems?<span class=\"ez-toc-section-end\"><\/span><\/h2>\r\n  <p>For many three-phase TT systems, a <strong>3P+N SPD \/ 3+1 SPD<\/strong> is commonly preferred.<\/p>\r\n  <p>In TT systems, neutral and protective earth are separate. The N-PE path can become important during surge events.<\/p>\r\n  <p>A 3+1 design gives specific surge protection between neutral and earth.<\/p>\r\n  <p>For a 230\/400V TT distribution board, buyers often ask for:<\/p>\r\n  <ul>\r\n    <li>Type 2 3P+N SPD<\/li>\r\n    <li>Type 1+2 3P+N SPD<\/li>\r\n    <li>275V, 320V, or 385V Uc depending on system voltage and grid condition<\/li>\r\n    <li>Remote signal contact if required<\/li>\r\n    <li>DIN rail mounting<\/li>\r\n    <li>IEC 61643-11 compliance<\/li>\r\n  <\/ul>\r\n  <p>For TT systems, do not choose a 4P SPD only because it has four modules. Confirm whether the design is suitable for TT use and whether the N-PE path is correct.<\/p>\r\n\r\n  <h2><span class=\"ez-toc-section\" id=\"which-spd-should-be-used-in-tn-s-systems\"><\/span>Which SPD Should Be Used in TN-S Systems?<span class=\"ez-toc-section-end\"><\/span><\/h2>\r\n  <p>In TN-S systems, neutral and PE are separate conductors.<\/p>\r\n  <p>Both 3P+N and 4P configurations may appear in the market. The correct choice depends on the project design, local practice, and SPD circuit diagram.<\/p>\r\n  <p>For many buyers, a 3P+N SPD is a common choice when the board has L1, L2, L3, N, and PE.<\/p>\r\n  <p>But a 4P SPD may also be specified in some TN-S distribution boards.<\/p>\r\n  <p>The important point is this:<\/p>\r\n  <div class=\"cnspd-answer-box\">\r\n    <p><strong>TN-S does not automatically mean 4P. TN-S also does not automatically mean 3P+N.<\/strong><\/p>\r\n    <p>You need to confirm whether the project requires a 3+1 or 4+0 structure.<\/p>\r\n  <\/div>\r\n\r\n  <h2><span class=\"ez-toc-section\" id=\"which-spd-should-be-used-in-tn-c-s-systems\"><\/span>Which SPD Should Be Used in TN-C-S Systems?<span class=\"ez-toc-section-end\"><\/span><\/h2>\r\n  <p>TN-C-S systems need more attention.<\/p>\r\n  <p>In a TN-C-S system, PEN is combined at one part of the system and separated into PE and N at another point.<\/p>\r\n  <p>Before the PEN is separated, there is no independent neutral and PE. After the PEN is separated, the system behaves more like a TN-S section.<\/p>\r\n  <p>So the SPD selection depends on the installation point.<\/p>\r\n\r\n  <div class=\"cnspd-article-table-wrap\">\r\n    <table>\r\n      <thead>\r\n        <tr>\r\n          <th>Installation Point<\/th>\r\n          <th>Common SPD Choice<\/th>\r\n          <th>Reason<\/th>\r\n        <\/tr>\r\n      <\/thead>\r\n      <tbody>\r\n        <tr>\r\n          <td>Before PEN separation<\/td>\r\n          <td>3P SPD<\/td>\r\n          <td>L1, L2, and L3 are protected to PEN. N and PE are not separated yet.<\/td>\r\n        <\/tr>\r\n        <tr>\r\n          <td>After PEN separation<\/td>\r\n          <td>3P+N or 4P SPD<\/td>\r\n          <td>N and PE are available as separate conductors. Treat this section more like TN-S.<\/td>\r\n        <\/tr>\r\n        <tr>\r\n          <td>Inside final distribution board<\/td>\r\n          <td>Confirm project drawing<\/td>\r\n          <td>The correct structure depends on N-PE path, RCD arrangement, and project requirement.<\/td>\r\n        <\/tr>\r\n      <\/tbody>\r\n    <\/table>\r\n  <\/div>\r\n\r\n  <p>This is a common source of mistakes. A buyer may say, \u201cMy system is TN-C-S, please give me 4P SPD.\u201d But the supplier still needs to know where the SPD will be installed.<\/p>\r\n\r\n  <h2><span class=\"ez-toc-section\" id=\"which-spd-should-be-used-in-tn-c-systems\"><\/span>Which SPD Should Be Used in TN-C Systems?<span class=\"ez-toc-section-end\"><\/span><\/h2>\r\n  <p>In a TN-C system, neutral and protective earth are combined as PEN.<\/p>\r\n  <p>There is no separate N and PE conductor at the installation point.<\/p>\r\n  <p>For this reason, a three-pole SPD is commonly used for L1, L2, and L3 protection to PEN.<\/p>\r\n  <p>A 3P+N SPD is normally not used before PEN separation because there is no separate N-PE path.<\/p>\r\n\r\n  <h2><span class=\"ez-toc-section\" id=\"selection-table-tt-vs-tn-s-vs-tn-c-s-vs-tn-c\"><\/span>Selection Table: TT vs TN-S vs TN-C-S vs TN-C<span class=\"ez-toc-section-end\"><\/span><\/h2>\r\n  <div class=\"cnspd-article-table-wrap\">\r\n    <table>\r\n      <thead>\r\n        <tr>\r\n          <th>Earthing System<\/th>\r\n          <th>Neutral Available?<\/th>\r\n          <th>PE Separate?<\/th>\r\n          <th>Common SPD Choice<\/th>\r\n          <th>Buyer Note<\/th>\r\n        <\/tr>\r\n      <\/thead>\r\n      <tbody>\r\n        <tr>\r\n          <td>TT<\/td>\r\n          <td>Yes<\/td>\r\n          <td>Yes<\/td>\r\n          <td>3P+N \/ 3+1<\/td>\r\n          <td>N-PE surge protection is important<\/td>\r\n        <\/tr>\r\n        <tr>\r\n          <td>TN-S<\/td>\r\n          <td>Yes<\/td>\r\n          <td>Yes<\/td>\r\n          <td>3P+N or 4P<\/td>\r\n          <td>Check 3+1 or 4+0 design<\/td>\r\n        <\/tr>\r\n        <tr>\r\n          <td>TN-C-S before PEN split<\/td>\r\n          <td>No separate N\/PE<\/td>\r\n          <td>No<\/td>\r\n          <td>3P<\/td>\r\n          <td>Protect L1, L2, L3 to PEN<\/td>\r\n        <\/tr>\r\n        <tr>\r\n          <td>TN-C-S after PEN split<\/td>\r\n          <td>Yes<\/td>\r\n          <td>Yes<\/td>\r\n          <td>3P+N or 4P<\/td>\r\n          <td>Treat like TN-S section<\/td>\r\n        <\/tr>\r\n        <tr>\r\n          <td>TN-C<\/td>\r\n          <td>PEN only<\/td>\r\n          <td>No<\/td>\r\n          <td>3P<\/td>\r\n          <td>Do not assume 4P is needed<\/td>\r\n        <\/tr>\r\n        <tr>\r\n          <td>IT<\/td>\r\n          <td>Depends<\/td>\r\n          <td>Depends<\/td>\r\n          <td>Project-specific<\/td>\r\n          <td>Ask engineer or supplier<\/td>\r\n        <\/tr>\r\n      <\/tbody>\r\n    <\/table>\r\n  <\/div>\r\n\r\n  <h2><span class=\"ez-toc-section\" id=\"wiring-difference-3pn-spd-vs-4p-spd\"><\/span>Wiring Difference: 3P+N SPD vs 4P SPD<span class=\"ez-toc-section-end\"><\/span><\/h2>\r\n  <p>For this topic, the wiring diagram is very important.<\/p>\r\n  <p>A text explanation is not enough for many buyers. A panel builder needs to see the real protection paths.<\/p>\r\n\r\n  <h3>3P+N SPD Typical Concept<\/h3>\r\n  <p>A common 3P+N \/ 3+1 SPD structure uses:<\/p>\r\n  <ul>\r\n    <li>L1 to N<\/li>\r\n    <li>L2 to N<\/li>\r\n    <li>L3 to N<\/li>\r\n    <li>N to PE<\/li>\r\n  <\/ul>\r\n  <p>The first three paths are usually MOV-based. The N-PE path is often GDT or spark-gap based.<\/p>\r\n\r\n  <h3>4P SPD Typical Concept<\/h3>\r\n  <p>A common 4P \/ 4+0 SPD structure uses four voltage-limiting protection paths.<\/p>\r\n  <p>The actual wiring path depends on the product design and the manufacturer\u2019s circuit diagram.<\/p>\r\n  <p>This is why the drawing must be checked before ordering.<\/p>\r\n\r\n  <h2><span class=\"ez-toc-section\" id=\"common-applications\"><\/span>Common Applications<span class=\"ez-toc-section-end\"><\/span><\/h2>\r\n  <p>3P+N and 4P SPDs are widely used in low-voltage three-phase distribution systems.<\/p>\r\n\r\n  <div class=\"cnspd-article-table-wrap\">\r\n    <table>\r\n      <thead>\r\n        <tr>\r\n          <th>Application<\/th>\r\n          <th>Common Requirement<\/th>\r\n        <\/tr>\r\n      <\/thead>\r\n      <tbody>\r\n        <tr>\r\n          <td>Main distribution board<\/td>\r\n          <td>Type 1+2 or Type 2 SPD depending on lightning risk<\/td>\r\n        <\/tr>\r\n        <tr>\r\n          <td>Sub-distribution board<\/td>\r\n          <td>Type 2 SPD<\/td>\r\n        <\/tr>\r\n        <tr>\r\n          <td>Commercial building panel<\/td>\r\n          <td>3P+N or 4P depending on earthing system<\/td>\r\n        <\/tr>\r\n        <tr>\r\n          <td>Industrial control cabinet<\/td>\r\n          <td>Type 2 SPD with clear wiring diagram<\/td>\r\n        <\/tr>\r\n        <tr>\r\n          <td>OEM electrical panel<\/td>\r\n          <td>Confirm 3+1 or 4+0 before production<\/td>\r\n        <\/tr>\r\n        <tr>\r\n          <td>Solar AC combiner \/ AC distribution side<\/td>\r\n          <td>Confirm grid system and SPD type<\/td>\r\n        <\/tr>\r\n        <tr>\r\n          <td>Telecom or equipment room panel<\/td>\r\n          <td>Often requires remote signal contact<\/td>\r\n        <\/tr>\r\n      <\/tbody>\r\n    <\/table>\r\n  <\/div>\r\n\r\n  <h2><span class=\"ez-toc-section\" id=\"common-buying-mistakes\"><\/span>Common Buying Mistakes<span class=\"ez-toc-section-end\"><\/span><\/h2>\r\n\r\n  <h3>Mistake 1: Thinking 4P Is Always Better Than 3P+N<\/h3>\r\n  <p>More poles do not always mean better protection.<\/p>\r\n  <p>A 4P SPD may be correct for one system. A 3P+N SPD may be better for another.<\/p>\r\n  <p>The right choice depends on the earthing system and internal circuit.<\/p>\r\n\r\n  <h3>Mistake 2: Treating 3P+N and 4P as the Same Product<\/h3>\r\n  <p>They may both have four modules. But the protection structure may be different.<\/p>\r\n  <p>A 3P+N SPD often has a special N-PE module. A 4P SPD may not.<\/p>\r\n  <p>Always check the circuit diagram.<\/p>\r\n\r\n  <h3>Mistake 3: Ignoring TT \/ TN-S \/ TN-C-S Differences<\/h3>\r\n  <p>A product that works in TN-S may not be the best choice for TT.<\/p>\r\n  <p>A product selected after PEN separation may not be correct before PEN separation.<\/p>\r\n  <p>The grounding system is not a small detail. It decides the SPD structure.<\/p>\r\n\r\n  <h3>Mistake 4: Choosing Only by Uc Voltage<\/h3>\r\n  <p>Uc is important. But Uc alone does not decide whether you need 3P+N or 4P.<\/p>\r\n  <p>For example, 275V, 320V, and 385V SPDs may all exist in different pole configurations.<\/p>\r\n  <p>You need to confirm both the electrical rating and the internal wiring structure.<\/p>\r\n\r\n  <h3>Mistake 5: Not Confirming RCD Position<\/h3>\r\n  <p>In some installations, RCD coordination can affect SPD selection and wiring.<\/p>\r\n  <p>This is especially important in TT systems.<\/p>\r\n  <p>Before ordering, confirm whether the RCD is upstream or downstream of the SPD. If you are not sure, send the panel drawing to the supplier.<\/p>\r\n\r\n  <h2><span class=\"ez-toc-section\" id=\"how-to-choose-simple-decision-process\"><\/span>How to Choose: Simple Decision Process<span class=\"ez-toc-section-end\"><\/span><\/h2>\r\n\r\n  <div class=\"cnspd-scenario-grid\">\r\n    <div class=\"cnspd-scenario-card\">\r\n      <h3>Step 1: Confirm the Earthing System<\/h3>\r\n      <p>Check whether the system is TT, TN-S, TN-C-S, TN-C, or IT. Do not guess.<\/p>\r\n    <\/div>\r\n    <div class=\"cnspd-scenario-card\">\r\n      <h3>Step 2: Confirm N and PE<\/h3>\r\n      <p>Check whether neutral and PE are separate, or whether PEN is still combined.<\/p>\r\n    <\/div>\r\n    <div class=\"cnspd-scenario-card\">\r\n      <h3>Step 3: Confirm the Circuit<\/h3>\r\n      <p>Ask whether the project requires 3+1, 4+0, N-PE spark gap, or another structure.<\/p>\r\n    <\/div>\r\n    <div class=\"cnspd-scenario-card\">\r\n      <h3>Step 4: Confirm SPD Type<\/h3>\r\n      <p>Choose Type 1+2 or Type 2 according to the installation position and project requirement.<\/p>\r\n    <\/div>\r\n  <\/div>\r\n\r\n  <h2><span class=\"ez-toc-section\" id=\"recommended-selection-for-buyers\"><\/span>Recommended Selection for Buyers<span class=\"ez-toc-section-end\"><\/span><\/h2>\r\n  <p>For most B2B buyers, the product name is not enough.<\/p>\r\n  <p>A better inquiry format is:<\/p>\r\n\r\n  <div class=\"cnspd-answer-box\">\r\n    <p>We need an SPD for a three-phase distribution board.<\/p>\r\n    <p>System: TT \/ TN-S \/ TN-C-S.<\/p>\r\n    <p>Voltage: 230\/400V.<\/p>\r\n    <p>Required configuration: 3P+N \/ 3+1 or 4P \/ 4+0.<\/p>\r\n    <p>SPD Type: Type 2 or Type 1+2.<\/p>\r\n    <p>Uc: 275V \/ 320V \/ 385V.<\/p>\r\n    <p>Remote signal: yes \/ no.<\/p>\r\n    <p>Please recommend a suitable DIN rail SPD with wiring diagram.<\/p>\r\n  <\/div>\r\n\r\n  <p>This gives the supplier enough information to recommend the correct model.<\/p>\r\n\r\n  <figure class=\"cnspd-image\">\r\n    <img decoding=\"async\" src=\"https:\/\/www.cnspd.com\/wp-content\/uploads\/2026\/07\/Checklist-before-ordering-SPD-systems.webp\" alt=\"Before ordering 3P+N or 4P SPD checklist for earthing system voltage wiring diagram and SPD type\" loading=\"lazy\" \/>\r\n    <figcaption>Before ordering 3P+N or 4P SPD, confirm the system, voltage, wiring diagram, SPD type, and OEM requirements.<\/figcaption>\r\n  <\/figure>\r\n\r\n  <h2><span class=\"ez-toc-section\" id=\"before-ordering-checklist\"><\/span>Before Ordering Checklist<span class=\"ez-toc-section-end\"><\/span><\/h2>\r\n  <div class=\"cnspd-checklist\">\r\n    <p>Before choosing 3P+N or 4P SPD, confirm these details:<\/p>\r\n    <ul>\r\n      <li>Earthing system: TT, TN-S, TN-C-S, TN-C, or IT<\/li>\r\n      <li>Whether neutral is available<\/li>\r\n      <li>Whether PE is separate from neutral<\/li>\r\n      <li>Whether PEN has already been split<\/li>\r\n      <li>Installation position in the panel<\/li>\r\n      <li>SPD type: Type 1, Type 1+2, or Type 2<\/li>\r\n      <li>Required structure: 3+1 or 4+0<\/li>\r\n      <li>N-PE protection requirement<\/li>\r\n      <li>Uc voltage<\/li>\r\n      <li>In, Imax, and Iimp rating<\/li>\r\n      <li>Backup fuse requirement<\/li>\r\n      <li>Remote signal contact<\/li>\r\n      <li>RCD position<\/li>\r\n      <li>DIN rail space<\/li>\r\n      <li>Required standard or certificate<\/li>\r\n      <li>OEM label or private label requirement<\/li>\r\n    <\/ul>\r\n  <\/div>\r\n\r\n  <h2><span class=\"ez-toc-section\" id=\"product-recommendation-direction\"><\/span>Product Recommendation Direction<span class=\"ez-toc-section-end\"><\/span><\/h2>\r\n\r\n  <h3>Option 1: 3P+N Type 2 SPD<\/h3>\r\n  <p>Suitable for many TT and TN-S distribution boards where Type 2 protection is required.<\/p>\r\n  <p>Common for commercial distribution boards, sub-distribution panels, OEM electrical panels, and building power distribution.<\/p>\r\n\r\n  <h3>Option 2: 3P+N Type 1+2 SPD<\/h3>\r\n  <p>Suitable for installations with higher lightning exposure or main distribution boards where lightning current discharge capacity is required.<\/p>\r\n  <p>Common for main incoming panels, buildings with external lightning protection, overhead line supply, and industrial power distribution.<\/p>\r\n\r\n  <h3>Option 3: 4P Type 2 SPD<\/h3>\r\n  <p>Suitable where the project drawing specifies a 4-pole \/ 4+0 design.<\/p>\r\n  <p>Common for TN-S distribution boards, project-specific panel designs, and markets where 4P SPD is the standard naming practice.<\/p>\r\n\r\n  <h3>Option 4: 3P SPD<\/h3>\r\n  <p>Suitable for TN-C systems or TN-C-S systems before PEN separation.<\/p>\r\n  <p>Common for three-phase systems without separate neutral, L1\/L2\/L3 to PEN protection, and industrial boards with combined PEN at the installation point.<\/p>\r\n\r\n  <section class=\"cnspd-faq\">\r\n    <h2><span class=\"ez-toc-section\" id=\"faq\"><\/span>FAQ<span class=\"ez-toc-section-end\"><\/span><\/h2>\r\n\r\n    <div class=\"cnspd-faq-item\">\r\n      <h3>Is 3P+N SPD the same as 4P SPD?<\/h3>\r\n      <p>No. They may look similar, but they may have different internal circuits. A 3P+N SPD usually means a 3+1 design with a special N-PE protection module. A 4P SPD usually means a 4+0 design with four voltage-limiting protection paths. Always check the wiring diagram.<\/p>\r\n    <\/div>\r\n\r\n    <div class=\"cnspd-faq-item\">\r\n      <h3>What is the difference between 3+1 and 4+0 SPD?<\/h3>\r\n      <p>A 3+1 SPD usually has three phase-to-neutral protection paths and one N-PE voltage-switching path. A 4+0 SPD usually has four voltage-limiting protection paths. The biggest difference is how neutral-to-earth protection is handled.<\/p>\r\n    <\/div>\r\n\r\n    <div class=\"cnspd-faq-item\">\r\n      <h3>Which SPD should I use for a TT system?<\/h3>\r\n      <p>For many three-phase TT systems, a 3P+N \/ 3+1 SPD is commonly selected because N-PE surge protection is important. However, the final choice should follow the project design, local standard, and manufacturer wiring diagram.<\/p>\r\n    <\/div>\r\n\r\n    <div class=\"cnspd-faq-item\">\r\n      <h3>Which SPD should I use for a TN-S system?<\/h3>\r\n      <p>For TN-S systems, both 3P+N and 4P configurations may be used depending on the design. The buyer should confirm whether the project requires a 3+1 circuit or a 4+0 circuit.<\/p>\r\n    <\/div>\r\n\r\n    <div class=\"cnspd-faq-item\">\r\n      <h3>Can I use 4P SPD instead of 3P+N SPD?<\/h3>\r\n      <p>Not always. A 4P SPD may not have the same N-PE protection structure as a 3P+N SPD. If the project requires 3+1 protection, do not replace it with a 4P SPD without checking the circuit diagram.<\/p>\r\n    <\/div>\r\n\r\n    <div class=\"cnspd-faq-item\">\r\n      <h3>Is 4P SPD better than 3P+N SPD?<\/h3>\r\n      <p>No. 4P is not automatically better. 3P+N and 4P are different structures for different systems. The better choice depends on the earthing system, neutral arrangement, and wiring requirement.<\/p>\r\n    <\/div>\r\n\r\n    <div class=\"cnspd-faq-item\">\r\n      <h3>What should I send to the supplier before ordering?<\/h3>\r\n      <p>Send the earthing system, system voltage, panel wiring diagram, SPD type, Uc voltage, discharge current rating, remote signal requirement, and whether you need OEM label or private label service.<\/p>\r\n    <\/div>\r\n  <\/section>\r\n\r\n  <section class=\"cnspd-related\">\r\n    <h2><span class=\"ez-toc-section\" id=\"related-reading\"><\/span>Related Reading<span class=\"ez-toc-section-end\"><\/span><\/h2>\r\n    <ul>\r\n      <li><a href=\"https:\/\/www.cnspd.com\/spd-uc-selection\/\" target=\"_blank\" rel=\"noopener\">SPD Uc Selection Guide<\/a><\/li>\r\n      <li><a href=\"https:\/\/www.cnspd.com\/spd-in-rating-selection\/\" target=\"_blank\" rel=\"noopener\">SPD In Rating Selection Guide<\/a><\/li>\r\n      <li><a href=\"https:\/\/www.cnspd.com\/spd-imax-selection\/\" target=\"_blank\" rel=\"noopener\">SPD Imax Selection Guide<\/a><\/li>\r\n      <li><a href=\"https:\/\/www.cnspd.com\/type-2-din-rail-surge-protector\/\" target=\"_blank\" rel=\"noopener\">Type 2 DIN Rail Surge Protector<\/a><\/li>\r\n      <li><a href=\"https:\/\/www.cnspd.com\/spd-manufacturer-china\/\" target=\"_blank\" rel=\"noopener\">SPD Manufacturer China<\/a><\/li>\r\n    <\/ul>\r\n  <\/section>\r\n\r\n  <section class=\"cnspd-light-cta\">\r\n    <h2><span class=\"ez-toc-section\" id=\"need-help-choosing-3pn-or-4p-spd\"><\/span>Need Help Choosing 3P+N or 4P SPD?<span class=\"ez-toc-section-end\"><\/span><\/h2>\r\n    <p>If you are not sure which SPD structure is suitable for your three-phase distribution board, send us your system voltage, grounding system, and panel wiring diagram.<\/p>\r\n    <p>LEEYEE can help recommend a suitable SPD configuration for distribution boards, OEM electrical panels, and private label SPD orders.<\/p>\r\n    <div class=\"cnspd-btn-row\">\r\n      <a href=\"javascript:void(0);\" class=\"cnspd-btn leeyee-site-popup-btn\"><span>Ask for SPD Selection Help<\/span><\/a>\r\n      <a href=\"https:\/\/www.cnspd.com\/contact\/\" class=\"cnspd-btn cnspd-btn-secondary\" target=\"_blank\" rel=\"noopener\"><span>Send Your Panel Requirement<\/span><\/a>\r\n    <\/div>\r\n  <\/section>\r\n\r\n<\/article>\r\n\r\n<script>\r\n  document.addEventListener('DOMContentLoaded', function () {\r\n    var popupButtons = document.querySelectorAll('.leeyee-site-popup-btn');\r\n\r\n    popupButtons.forEach(function (button) {\r\n      button.addEventListener('click', function (event) {\r\n        event.preventDefault();\r\n\r\n        var popupTrigger = document.querySelector('.w-popup.ush_popup_1 .w-popup-trigger');\r\n\r\n        if (popupTrigger) {\r\n          popupTrigger.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  \"@type\": \"FAQPage\",\r\n  \"mainEntity\": [\r\n    {\r\n      \"@type\": \"Question\",\r\n      \"name\": \"Is 3P+N SPD the same as 4P SPD?\",\r\n      \"acceptedAnswer\": {\r\n        \"@type\": \"Answer\",\r\n        \"text\": \"No. They may look similar, but they may have different internal circuits. 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However, the final choice should follow the project design, local standard, and manufacturer wiring diagram.\"\r\n      }\r\n    },\r\n    {\r\n      \"@type\": \"Question\",\r\n      \"name\": \"Which SPD should I use for a TN-S system?\",\r\n      \"acceptedAnswer\": {\r\n        \"@type\": \"Answer\",\r\n        \"text\": \"For TN-S systems, both 3P+N and 4P configurations may be used depending on the design. The buyer should confirm whether the project requires a 3+1 circuit or a 4+0 circuit.\"\r\n      }\r\n    },\r\n    {\r\n      \"@type\": \"Question\",\r\n      \"name\": \"Can I use 4P SPD instead of 3P+N SPD?\",\r\n      \"acceptedAnswer\": {\r\n        \"@type\": \"Answer\",\r\n        \"text\": \"Not always. A 4P SPD may not have the same N-PE protection structure as a 3P+N SPD. If the project requires 3+1 protection, do not replace it with a 4P SPD without checking the circuit diagram.\"\r\n      }\r\n    },\r\n    {\r\n      \"@type\": \"Question\",\r\n      \"name\": \"Is 4P SPD better than 3P+N SPD?\",\r\n      \"acceptedAnswer\": {\r\n        \"@type\": \"Answer\",\r\n        \"text\": \"No. 4P is not automatically better. 3P+N and 4P are different structures for different systems. The better choice depends on the earthing system, neutral arrangement, and wiring requirement.\"\r\n      }\r\n    },\r\n    {\r\n      \"@type\": \"Question\",\r\n      \"name\": \"What should I send to the supplier before ordering?\",\r\n      \"acceptedAnswer\": {\r\n        \"@type\": \"Answer\",\r\n        \"text\": \"Send the earthing system, system voltage, panel wiring diagram, SPD type, Uc voltage, discharge current rating, remote signal requirement, and whether you need OEM label or private label service.\"\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>Three-Phase SPD Selection Guide Not sure whether to order a 3P+N SPD or a 4P SPD for a three-phase distribution board? This is a common question for panel builders, electrical distributors, OEM buyers, and project engineers. The two products may look similar from the outside. Both can have four modules. Both may be used in&#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-29706","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>3P+N SPD vs 4P SPD: 3+1 vs 4+0 Selection Guide<\/title>\n<meta name=\"description\" content=\"Compare 3P+N and 4P SPD for three-phase boards. Learn 3+1 vs 4+0 structure, MOV\/GDT difference, TT\/TN-S\/TN-C-S selection, wiring and ordering points.\" \/>\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\/pt\/3pn-spd-vs-4p-spd\/\" \/>\n<meta property=\"og:locale\" content=\"pt_PT\" \/>\n<meta property=\"og:type\" content=\"article\" \/>\n<meta property=\"og:title\" content=\"3P+N SPD vs 4P SPD: 3+1 vs 4+0 Selection Guide\" \/>\n<meta property=\"og:description\" content=\"Compare 3P+N and 4P SPD for three-phase boards. Learn 3+1 vs 4+0 structure, MOV\/GDT difference, TT\/TN-S\/TN-C-S selection, wiring and ordering points.\" \/>\n<meta property=\"og:url\" content=\"https:\/\/www.cnspd.com\/pt\/3pn-spd-vs-4p-spd\/\" \/>\n<meta property=\"og:site_name\" content=\"Surge Protector, Surge Arrestor, Isolating Switch - LEEYEE\" \/>\n<meta property=\"article:published_time\" content=\"2026-07-01T06:44:14+00:00\" \/>\n<meta property=\"article:modified_time\" content=\"2026-07-01T07:09:13+00:00\" \/>\n<meta property=\"og:image\" content=\"https:\/\/www.cnspd.com\/wp-content\/uploads\/2026\/07\/3PN-vs-4P-SPD-comparison.png\" \/>\n<meta name=\"author\" content=\"Devin Ling\" \/>\n<meta name=\"twitter:card\" content=\"summary_large_image\" \/>\n<meta name=\"twitter:label1\" content=\"Escrito por\" \/>\n\t<meta name=\"twitter:data1\" content=\"Devin Ling\" \/>\n\t<meta name=\"twitter:label2\" content=\"Tempo estimado de leitura\" \/>\n\t<meta name=\"twitter:data2\" content=\"12 minutos\" \/>\n<script type=\"application\/ld+json\" class=\"yoast-schema-graph\">{\"@context\":\"https:\\\/\\\/schema.org\",\"@graph\":[{\"@type\":\"Article\",\"@id\":\"https:\\\/\\\/www.cnspd.com\\\/3pn-spd-vs-4p-spd\\\/#article\",\"isPartOf\":{\"@id\":\"https:\\\/\\\/www.cnspd.com\\\/3pn-spd-vs-4p-spd\\\/\"},\"author\":{\"name\":\"Devin Ling\",\"@id\":\"https:\\\/\\\/www.cnspd.com\\\/#\\\/schema\\\/person\\\/f49dbafe62c5b47100ad2d9f88af92d3\"},\"headline\":\"3P+N SPD vs 4P SPD for Three-Phase Distribution Boards\",\"datePublished\":\"2026-07-01T06:44:14+00:00\",\"dateModified\":\"2026-07-01T07:09:13+00:00\",\"mainEntityOfPage\":{\"@id\":\"https:\\\/\\\/www.cnspd.com\\\/3pn-spd-vs-4p-spd\\\/\"},\"wordCount\":2623,\"image\":{\"@id\":\"https:\\\/\\\/www.cnspd.com\\\/3pn-spd-vs-4p-spd\\\/#primaryimage\"},\"thumbnailUrl\":\"https:\\\/\\\/www.cnspd.com\\\/wp-content\\\/uploads\\\/2026\\\/07\\\/3PN-vs-4P-SPD-comparison.png\",\"articleSection\":[\"News\"],\"inLanguage\":\"pt-PT\"},{\"@type\":\"WebPage\",\"@id\":\"https:\\\/\\\/www.cnspd.com\\\/3pn-spd-vs-4p-spd\\\/\",\"url\":\"https:\\\/\\\/www.cnspd.com\\\/3pn-spd-vs-4p-spd\\\/\",\"name\":\"3P+N SPD vs 4P SPD: 3+1 vs 4+0 Selection Guide\",\"isPartOf\":{\"@id\":\"https:\\\/\\\/www.cnspd.com\\\/#website\"},\"primaryImageOfPage\":{\"@id\":\"https:\\\/\\\/www.cnspd.com\\\/3pn-spd-vs-4p-spd\\\/#primaryimage\"},\"image\":{\"@id\":\"https:\\\/\\\/www.cnspd.com\\\/3pn-spd-vs-4p-spd\\\/#primaryimage\"},\"thumbnailUrl\":\"https:\\\/\\\/www.cnspd.com\\\/wp-content\\\/uploads\\\/2026\\\/07\\\/3PN-vs-4P-SPD-comparison.png\",\"datePublished\":\"2026-07-01T06:44:14+00:00\",\"dateModified\":\"2026-07-01T07:09:13+00:00\",\"author\":{\"@id\":\"https:\\\/\\\/www.cnspd.com\\\/#\\\/schema\\\/person\\\/f49dbafe62c5b47100ad2d9f88af92d3\"},\"description\":\"Compare 3P+N and 4P SPD for three-phase boards. 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