{"id":29598,"date":"2026-06-25T14:54:12","date_gmt":"2026-06-25T06:54:12","guid":{"rendered":"https:\/\/www.cnspd.com\/?page_id=29598"},"modified":"2026-07-02T14:07:00","modified_gmt":"2026-07-02T06:07:00","slug":"spd-selection-guide","status":"publish","type":"page","link":"https:\/\/www.cnspd.com\/fr\/guide-de-selection-spd\/","title":{"rendered":"Guide de s\u00e9lection SPD"},"content":{"rendered":"<section class=\"l-section wpb_row height_large width_full\"><div class=\"l-section-h i-cf\"><div class=\"g-cols vc_row via_grid cols_1 laptops-cols_inherit tablets-cols_inherit mobiles-cols_1 valign_top type_default stacking_default\"><div class=\"wpb_column vc_column_container\"><div class=\"vc_column-inner\"><div class=\"w-html us_custom_8b3cf7b3\"><style>\n  .ly-spd-guide {\n    --ly-blue: #004898;\n    --ly-blue-dark: #00366f;\n    --ly-blue-soft: #eef6ff;\n    --ly-ink: #142033;\n    --ly-text: #566174;\n    --ly-light: #f6f9fd;\n    --ly-line: #dbe7f5;\n    --ly-card: #ffffff;\n    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{\n      border-radius: 20px;\n      padding: 20px;\n    }\n\n    .lysg-table {\n      min-width: 820px;\n    }\n  }\n<\/style>\n\n<div class=\"ly-spd-guide\">\n\n  <section class=\"lysg-hero\">\n    <div class=\"lysg-wrap\">\n      <div class=\"lysg-hero-grid\">\n\n        <div>\n          <div class=\"lysg-eyebrow\"><i><\/i> SPD Selection Guide for AC, DC, Solar PV & Distribution Boards<\/div>\n\n          <h1>SPD Selection Guide: <span>Choose the Right Surge Protective Device<\/span><\/h1>\n\n          <p class=\"lysg-lead\">\n            A practical surge protective device selection guide for engineers, panel builders, solar EPCs, distributors, and OEM buyers. Compare AC vs DC SPD, Type 1 vs Type 2 vs Type 1+2, voltage rating, poles, discharge current, IEC standards, and installation position.\n          <\/p>\n\n          <div class=\"lysg-answer\">\n            <strong>Direct answer for SPD selection<\/strong>\n            <p>\n              To choose an SPD, first identify whether the protected circuit is AC or DC. Then select the SPD type by installation position, match Uc or Ucpv to the system voltage, check Iimp, In, Imax and Up, confirm poles and earthing system, and verify backup protection and IEC standard compliance.\n            <\/p>\n          <\/div>\n\n          <div class=\"lysg-actions\">\n            <a class=\"lysg-btn lysg-btn-primary leeyee-site-popup-btn\" href=\"javascript:void(0);\">Request SPD Selection Help<\/a>\n            <a class=\"lysg-btn lysg-btn-secondary\" href=\"#spd-selection-table\">View Selection Table<\/a>\n          <\/div>\n        <\/div>\n\n        <div class=\"lysg-hero-panel\">\n          <div class=\"lysg-panel-head\">\n            <h2>Fast Selection Path<\/h2>\n            <span class=\"lysg-badge\">AI-ready decision flow<\/span>\n          <\/div>\n\n          <div class=\"lysg-flow\">\n            <div class=\"lysg-flow-item\">\n              <div class=\"lysg-num\">1<\/div>\n              <div>\n                <h3>AC or DC?<\/h3>\n                <p>Never use an AC SPD on the DC side of a PV system.<\/p>\n              <\/div>\n            <\/div>\n\n            <div class=\"lysg-flow-item\">\n              <div class=\"lysg-num\">2<\/div>\n              <div>\n                <h3>Where is it installed?<\/h3>\n                <p>Main incoming panel, distribution board, PV combiner box, inverter side, or terminal equipment.<\/p>\n              <\/div>\n            <\/div>\n\n            <div class=\"lysg-flow-item\">\n              <div class=\"lysg-num\">3<\/div>\n              <div>\n                <h3>Which SPD type?<\/h3>\n                <p>Type 1, Type 2, Type 1+2, or Type 3 depends on surge exposure and installation position.<\/p>\n              <\/div>\n            <\/div>\n\n            <div class=\"lysg-flow-item\">\n              <div class=\"lysg-num\">4<\/div>\n              <div>\n                <h3>Which voltage and poles?<\/h3>\n                <p>Check Uc or Ucpv, earthing system, phase count, polarity, and wiring mode.<\/p>\n              <\/div>\n            <\/div>\n\n            <div class=\"lysg-flow-item\">\n              <div class=\"lysg-num\">5<\/div>\n              <div>\n                <h3>Which rating and standard?<\/h3>\n                <p>Confirm Iimp, In, Imax, Up, backup protection, IEC 61643 series, and project requirement.<\/p>\n              <\/div>\n            <\/div>\n          <\/div>\n        <\/div>\n\n      <\/div>\n    <\/div>\n  <\/section>\n\n  <section class=\"lysg-section alt\">\n    <div class=\"lysg-wrap\">\n      <div class=\"lysg-head\">\n        <span class=\"lysg-kicker\">AI extractable rules<\/span>\n        <h2>6 rules for choosing the right SPD<\/h2>\n        <p>\n          These rules are the fastest way to narrow down the correct surge protective device before checking the final datasheet.\n        <\/p>\n      <\/div>\n\n      <div class=\"lysg-rule-list\">\n        <div class=\"lysg-rule\">\n          <div class=\"lysg-if\">IF the circuit is AC<\/div>\n          <div class=\"lysg-then\">\n            <strong>Choose an AC SPD.<\/strong> Use AC surge protective devices for building distribution boards, main panels, sub-panels, industrial control cabinets, and AC equipment inputs.\n          <\/div>\n        <\/div>\n\n        <div class=\"lysg-rule\">\n          <div class=\"lysg-if\">IF the circuit is PV DC<\/div>\n          <div class=\"lysg-then\">\n            <strong>Choose a DC SPD designed for photovoltaic systems.<\/strong> Do not install an AC SPD on the DC side of a solar PV system.\n          <\/div>\n        <\/div>\n\n        <div class=\"lysg-rule\">\n          <div class=\"lysg-if\">IF it is the main incoming panel<\/div>\n          <div class=\"lysg-then\">\n            <strong>Consider Type 1 or Type 1+2 SPD.<\/strong> This is especially important when the building has an external lightning protection system, overhead line exposure, or high lightning risk.\n          <\/div>\n        <\/div>\n\n        <div class=\"lysg-rule\">\n          <div class=\"lysg-if\">IF it is a distribution board<\/div>\n          <div class=\"lysg-then\">\n            <strong>Type 2 SPD is usually the main choice.<\/strong> Check Uc, In, Imax, Up, pole number, backup fuse or MCB, and earthing system.\n          <\/div>\n        <\/div>\n\n        <div class=\"lysg-rule\">\n          <div class=\"lysg-if\">IF it is a 1500V PV system<\/div>\n          <div class=\"lysg-then\">\n            <strong>Choose a 1500V DC SPD with suitable Ucpv.<\/strong> Confirm whether the project needs Type 2 DC SPD or Type 1+2 DC SPD according to lightning exposure and system design.\n          <\/div>\n        <\/div>\n\n        <div class=\"lysg-rule\">\n          <div class=\"lysg-if\">IF equipment is sensitive<\/div>\n          <div class=\"lysg-then\">\n            <strong>Coordinate downstream protection.<\/strong> A Type 3 SPD may be used close to sensitive loads, but it should normally be coordinated with upstream Type 2 protection.\n          <\/div>\n        <\/div>\n      <\/div>\n\n      <div class=\"lysg-warning\">\n        <strong>Important safety boundary<\/strong>\n        SPD selection must follow local electrical codes, project drawings, available fault current, grounding design, and the manufacturer\u2019s datasheet. This guide helps you select the direction, but final installation should be confirmed by a qualified electrical professional.\n      <\/div>\n    <\/div>\n  <\/section>\n\n  <section class=\"lysg-section\" id=\"spd-selection-table\">\n    <div class=\"lysg-wrap\">\n      <div class=\"lysg-head\">\n        <span class=\"lysg-kicker\">Selection table<\/span>\n        <h2>SPD selection by application, circuit and installation position<\/h2>\n        <p>\n          This table is designed for B2B buyers who need to match a practical SPD direction before choosing a model.\n        <\/p>\n      <\/div>\n\n      <div class=\"lysg-table-wrap\">\n        <table class=\"lysg-table\">\n          <thead>\n            <tr>\n              <th>Application<\/th>\n              <th>Circuit<\/th>\n              <th>Typical installation position<\/th>\n              <th>Recommended SPD direction<\/th>\n              <th>Key parameters to check<\/th>\n              <th>Related page<\/th>\n            <\/tr>\n          <\/thead>\n          <tbody>\n            <tr>\n              <td><strong>Main incoming panel<\/strong><\/td>\n              <td>AC<\/td>\n              <td>Service entrance, main switchboard, first distribution point<\/td>\n              <td>Type 1 or Type 1+2 AC SPD<\/td>\n              <td>Iimp, Uc, Up, poles, backup protection, earthing system<\/td>\n              <td><a href=\"https:\/\/www.cnspd.com\/type-1-2-spd\/\" target=\"_blank\" rel=\"noopener\">Type 1+2 SPD<\/a><\/td>\n            <\/tr>\n\n            <tr>\n              <td><strong>Distribution board<\/strong><\/td>\n              <td>AC<\/td>\n              <td>Residential, commercial, or industrial sub-panel<\/td>\n              <td>Type 2 AC SPD<\/td>\n              <td>Uc, In, Imax, Up, 1P\/2P\/3P\/4P, remote signal<\/td>\n              <td><a href=\"https:\/\/www.cnspd.com\/spd-for-distribution-board\/\" target=\"_blank\" rel=\"noopener\">SPD for Distribution Board<\/a><\/td>\n            <\/tr>\n\n            <tr>\n              <td><strong>Industrial control panel<\/strong><\/td>\n              <td>AC or DC<\/td>\n              <td>Control cabinet, machine panel, automation cabinet<\/td>\n              <td>DIN rail SPD, usually Type 2<\/td>\n              <td>Voltage, poles, mounting width, indicator, remote signal, backup protection<\/td>\n              <td><a href=\"https:\/\/www.cnspd.com\/din-rail-surge-protector\/\" target=\"_blank\" rel=\"noopener\">DIN Rail Surge Protector<\/a><\/td>\n            <\/tr>\n\n            <tr>\n              <td><strong>PV combiner box<\/strong><\/td>\n              <td>DC<\/td>\n              <td>Between PV strings and inverter input<\/td>\n              <td>DC Type 2 SPD or DC Type 1+2 SPD<\/td>\n              <td>Ucpv, 1000V\/1500V DC, In, Imax, Iimp if required, polarity<\/td>\n              <td><a href=\"https:\/\/www.cnspd.com\/pv-combiner-box-spd\/\" target=\"_blank\" rel=\"noopener\">PV Combiner Box SPD<\/a><\/td>\n            <\/tr>\n\n            <tr>\n              <td><strong>Solar inverter DC input<\/strong><\/td>\n              <td>DC<\/td>\n              <td>Inverter DC side, PV input side<\/td>\n              <td>1000V or 1500V DC SPD<\/td>\n              <td>Ucpv, PV maximum voltage, Type 2 or Type 1+2, DC disconnection design<\/td>\n              <td><a href=\"https:\/\/www.cnspd.com\/surge-protection-for-inverters\/\" target=\"_blank\" rel=\"noopener\">Surge Protection for Inverters<\/a><\/td>\n            <\/tr>\n\n            <tr>\n              <td><strong>1500V solar PV system<\/strong><\/td>\n              <td>DC<\/td>\n              <td>Utility-scale PV, high-voltage string inverter system<\/td>\n              <td>1500V DC SPD<\/td>\n              <td>Ucpv \u2265 maximum PV system voltage, In\/Imax, Iimp if Type 1+2 is required<\/td>\n              <td><a href=\"https:\/\/www.cnspd.com\/dc-spd-up-to-1500v\/\" target=\"_blank\" rel=\"noopener\">1500V DC SPD<\/a><\/td>\n            <\/tr>\n\n            <tr>\n              <td><strong>1000V solar PV system<\/strong><\/td>\n              <td>DC<\/td>\n              <td>Residential, commercial, or small ground-mount PV system<\/td>\n              <td>1000V DC SPD<\/td>\n              <td>Ucpv, PV string voltage, DC polarity, replaceable module, standard<\/td>\n              <td><a href=\"https:\/\/www.cnspd.com\/1000v-dc-spd\/\" target=\"_blank\" rel=\"noopener\">1000V DC SPD<\/a><\/td>\n            <\/tr>\n\n            <tr>\n              <td><strong>Sensitive terminal equipment<\/strong><\/td>\n              <td>AC or signal<\/td>\n              <td>Near load, controller, communication or sensitive electronics<\/td>\n              <td>Type 3 SPD or signal SPD after upstream protection<\/td>\n              <td>Uoc, Up, coordination distance, protected equipment withstand voltage<\/td>\n              <td><a href=\"https:\/\/www.cnspd.com\/spd-type1-vs-type2-vs-type-3\/\" target=\"_blank\" rel=\"noopener\">Type 1 vs Type 2 vs Type 3 SPD<\/a><\/td>\n            <\/tr>\n          <\/tbody>\n        <\/table>\n      <\/div>\n\n      <div class=\"lysg-note\">\n        <strong>How to use this table<\/strong>\n        First find the protected application. Then confirm AC or DC. After that, choose the SPD type, voltage rating, discharge current, poles, backup protection and standard from the datasheet.\n      <\/div>\n    <\/div>\n  <\/section>\n\n  <section class=\"lysg-section alt\">\n    <div class=\"lysg-wrap\">\n      <div class=\"lysg-head\">\n        <span class=\"lysg-kicker\">Step-by-step guide<\/span>\n        <h2>8 steps to select an SPD correctly<\/h2>\n        <p>\n          Use this process before requesting a quotation or approving a surge protective device for a project.\n        <\/p>\n      <\/div>\n\n      <div class=\"lysg-step-grid\">\n        <div class=\"lysg-step\">\n          <b>1<\/b>\n          <h3>Identify AC or DC<\/h3>\n          <p>Check whether the protected circuit is AC distribution, PV DC, battery DC, signal, or equipment-side protection.<\/p>\n        <\/div>\n\n        <div class=\"lysg-step\">\n          <b>2<\/b>\n          <h3>Define the location<\/h3>\n          <p>Main panel, sub-panel, combiner box, inverter input, control cabinet, or terminal equipment require different SPD directions.<\/p>\n        <\/div>\n\n        <div class=\"lysg-step\">\n          <b>3<\/b>\n          <h3>Select SPD type<\/h3>\n          <p>Choose Type 1, Type 2, Type 1+2, or Type 3 according to lightning exposure and protection level.<\/p>\n        <\/div>\n\n        <div class=\"lysg-step\">\n          <b>4<\/b>\n          <h3>Match voltage<\/h3>\n          <p>For AC, check Uc. For PV DC, check Ucpv and maximum open-circuit voltage under cold conditions.<\/p>\n        <\/div>\n\n        <div class=\"lysg-step\">\n          <b>5<\/b>\n          <h3>Check discharge rating<\/h3>\n          <p>Type 1 focuses on Iimp. Type 2 commonly uses In and Imax. Type 3 often involves Uoc and fine protection.<\/p>\n        <\/div>\n\n        <div class=\"lysg-step\">\n          <b>6<\/b>\n          <h3>Confirm Up<\/h3>\n          <p>The voltage protection level should be suitable for the equipment withstand voltage and coordinated with the system.<\/p>\n        <\/div>\n\n        <div class=\"lysg-step\">\n          <b>7<\/b>\n          <h3>Confirm poles and wiring<\/h3>\n          <p>Choose 1P, 2P, 3P, 4P, 3P+N or PV DC configuration according to wiring and earthing system.<\/p>\n        <\/div>\n\n        <div class=\"lysg-step\">\n          <b>8<\/b>\n          <h3>Verify standard and backup<\/h3>\n          <p>Check IEC standard, certification requirement, backup fuse or MCB, short-circuit rating and installation instructions.<\/p>\n        <\/div>\n      <\/div>\n    <\/div>\n  <\/section>\n\n  <section class=\"lysg-section\">\n    <div class=\"lysg-wrap\">\n      <div class=\"lysg-head\">\n        <span class=\"lysg-kicker\">AC vs DC<\/span>\n        <h2>AC SPD and DC SPD are not interchangeable<\/h2>\n        <p>\n          The first selection decision is circuit type. AC and DC SPDs are designed for different voltage behavior, application conditions and test requirements.\n        <\/p>\n      <\/div>\n\n      <div class=\"lysg-compare\">\n        <div class=\"lysg-compare-box\">\n          <h3>Choose AC SPD for AC power systems<\/h3>\n          <p>\n            AC SPDs are used in low-voltage AC distribution systems, including main panels, distribution boards, industrial cabinets and AC equipment inputs.\n          <\/p>\n\n          <div class=\"lysg-mini-list\">\n            <div><i>\u2713<\/i><span>Typical systems: 230\/400V AC, 277\/480V AC, three-phase distribution.<\/span><\/div>\n            <div><i>\u2713<\/i><span>Common types: Type 1, Type 2, Type 1+2, Type 3.<\/span><\/div>\n            <div><i>\u2713<\/i><span>Key parameters: Uc, Iimp, In, Imax, Up, poles, backup protection.<\/span><\/div>\n            <div><i>\u2713<\/i><span>Common standard direction: IEC 61643-11 for low-voltage AC SPDs.<\/span><\/div>\n          <\/div>\n        <\/div>\n\n        <div class=\"lysg-compare-box\">\n          <h3>Choose DC SPD for PV and DC systems<\/h3>\n          <p>\n            DC SPDs are used on the DC side of photovoltaic systems, such as PV strings, combiner boxes and inverter DC inputs.\n          <\/p>\n\n          <div class=\"lysg-mini-list\">\n            <div><i>\u2713<\/i><span>Typical systems: 600V, 1000V and 1500V DC solar PV systems.<\/span><\/div>\n            <div><i>\u2713<\/i><span>Common types: DC Type 2 SPD or DC Type 1+2 SPD.<\/span><\/div>\n            <div><i>\u2713<\/i><span>Key parameters: Ucpv, In, Imax, Iimp if required, PV polarity, DC disconnection design.<\/span><\/div>\n            <div><i>\u2713<\/i><span>Common standard direction: IEC 61643-31 for PV DC SPDs.<\/span><\/div>\n          <\/div>\n        <\/div>\n      <\/div>\n\n      <div class=\"lysg-warning\">\n        <strong>Do not use AC SPD on the PV DC side<\/strong>\n        DC circuits do not have the same natural current zero-crossing as AC circuits. PV DC SPDs must be selected according to PV voltage, DC application design and the correct DC-side SPD standard.\n      <\/div>\n    <\/div>\n  <\/section>\n\n  <section class=\"lysg-section alt\">\n    <div class=\"lysg-wrap\">\n      <div class=\"lysg-head\">\n        <span class=\"lysg-kicker\">Type selection<\/span>\n        <h2>How to choose Type 1, Type 2, Type 1+2 or Type 3 SPD<\/h2>\n        <p>\n          SPD type should be selected by installation position and surge exposure, not only by the kA number printed on the device.\n        <\/p>\n      <\/div>\n\n      <div class=\"lysg-table-wrap\">\n        <table class=\"lysg-table\">\n          <thead>\n            <tr>\n              <th>SPD Type<\/th>\n              <th>Typical position<\/th>\n              <th>Main selection meaning<\/th>\n              <th>Key parameter<\/th>\n              <th>When to consider it<\/th>\n            <\/tr>\n          <\/thead>\n          <tbody>\n            <tr>\n              <td><strong>Type 1 SPD<\/strong><\/td>\n              <td>Main incoming position or service entrance<\/td>\n              <td>Designed for lightning current duty at the entry point of the installation.<\/td>\n              <td>Iimp<\/td>\n              <td>External lightning protection system, overhead line exposure, high lightning risk.<\/td>\n            <\/tr>\n\n            <tr>\n              <td><strong>Type 2 SPD<\/strong><\/td>\n              <td>Distribution board, sub-panel, control cabinet<\/td>\n              <td>General secondary surge protection against induced surges and switching transients.<\/td>\n              <td>In, Imax, Up<\/td>\n              <td>Most common choice for distribution boards and many OEM electrical assemblies.<\/td>\n            <\/tr>\n\n            <tr>\n              <td><strong>Type 1+2 SPD<\/strong><\/td>\n              <td>Main panel or high-exposure system position<\/td>\n              <td>Combined device for lightning current capability and secondary surge protection.<\/td>\n              <td>Iimp, In, Imax, Up<\/td>\n              <td>Main panels, lightning-exposed sites, industrial systems, solar PV projects.<\/td>\n            <\/tr>\n\n            <tr>\n              <td><strong>Type 3 SPD<\/strong><\/td>\n              <td>Near sensitive terminal equipment<\/td>\n              <td>Fine protection close to the protected load, usually after upstream SPD protection.<\/td>\n              <td>Uoc, Up<\/td>\n              <td>Control electronics, sensitive loads, equipment with lower withstand voltage.<\/td>\n            <\/tr>\n          <\/tbody>\n        <\/table>\n      <\/div>\n\n      <div class=\"lysg-note\">\n        <strong>Selection shortcut<\/strong>\n        Main incoming panel usually points to Type 1 or Type 1+2. Distribution board usually points to Type 2. Sensitive terminal equipment may need Type 3 after upstream protection.\n      <\/div>\n    <\/div>\n  <\/section>\n\n  <section class=\"lysg-section\">\n    <div class=\"lysg-wrap\">\n      <div class=\"lysg-head\">\n        <span class=\"lysg-kicker\">Voltage and poles<\/span>\n        <h2>Choose the correct voltage rating and pole configuration<\/h2>\n        <p>\n          Many SPD selection errors happen because the voltage rating or pole configuration is chosen too casually.\n        <\/p>\n      <\/div>\n\n      <div class=\"lysg-grid-3\">\n        <div class=\"lysg-card\">\n          <h3>AC voltage: check Uc<\/h3>\n          <p>\n            For AC SPDs, the maximum continuous operating voltage is usually shown as Uc. It must be suitable for the actual AC system voltage and earthing arrangement.\n          <\/p>\n          <small>Common AC systems include 230\/400V and 277\/480V, but final selection depends on local network design.<\/small>\n        <\/div>\n\n        <div class=\"lysg-card\">\n          <h3>PV DC voltage: check Ucpv<\/h3>\n          <p>\n            For solar PV SPDs, check Ucpv against the maximum DC voltage of the PV string, including cold-temperature open-circuit voltage.\n          <\/p>\n          <small>1000V DC and 1500V DC PV systems require PV-rated DC SPDs with matching Ucpv.<\/small>\n        <\/div>\n\n        <div class=\"lysg-card\">\n          <h3>Poles: match the wiring<\/h3>\n          <p>\n            Pole selection depends on single-phase, three-phase, neutral arrangement, TT\/TN\/IT earthing system, and PV DC protection mode.\n          <\/p>\n          <small>Common options include 1P, 2P, 3P, 4P, 3P+N and PV DC configurations.<\/small>\n        <\/div>\n      <\/div>\n\n      <div class=\"lysg-table-wrap\" style=\"margin-top:22px;\">\n        <table class=\"lysg-table\">\n          <thead>\n            <tr>\n              <th>System<\/th>\n              <th>Common SPD configuration<\/th>\n              <th>What to confirm<\/th>\n            <\/tr>\n          <\/thead>\n          <tbody>\n            <tr>\n              <td><strong>Single-phase AC<\/strong><\/td>\n              <td>1P+N or 2P SPD<\/td>\n              <td>Line, neutral, earthing system, Uc, backup protection.<\/td>\n            <\/tr>\n            <tr>\n              <td><strong>Three-phase AC<\/strong><\/td>\n              <td>3P, 3P+N or 4P SPD<\/td>\n              <td>Neutral arrangement, TT\/TN system, panel wiring, phase voltage.<\/td>\n            <\/tr>\n            <tr>\n              <td><strong>PV DC<\/strong><\/td>\n              <td>PV DC SPD module<\/td>\n              <td>Positive\/negative polarity, Ucpv, 1000V\/1500V system, Type 2 or Type 1+2.<\/td>\n            <\/tr>\n            <tr>\n              <td><strong>OEM cabinet<\/strong><\/td>\n              <td>DIN rail pluggable SPD<\/td>\n              <td>Module width, remote signal, indicator window, replacement cartridge, wiring space.<\/td>\n            <\/tr>\n          <\/tbody>\n        <\/table>\n      <\/div>\n    <\/div>\n  <\/section>\n\n  <section class=\"lysg-section alt\">\n    <div class=\"lysg-wrap\">\n      <div class=\"lysg-head\">\n        <span class=\"lysg-kicker\">Parameter guide<\/span>\n        <h2>Key SPD parameters buyers should understand<\/h2>\n        <p>\n          Do not compare SPDs only by one headline kA number. Use the full parameter set to judge whether the device fits the system.\n        <\/p>\n      <\/div>\n\n      <div class=\"lysg-table-wrap\">\n        <table class=\"lysg-table\">\n          <thead>\n            <tr>\n              <th>Parameter<\/th>\n              <th>Meaning<\/th>\n              <th>Selection use<\/th>\n            <\/tr>\n          <\/thead>\n          <tbody>\n            <tr>\n              <td><strong>Uc<\/strong><\/td>\n              <td>Maximum continuous operating voltage for AC SPD.<\/td>\n              <td>Must be suitable for the normal AC system voltage.<\/td>\n            <\/tr>\n\n            <tr>\n              <td><strong>Ucpv<\/strong><\/td>\n              <td>Maximum continuous operating voltage for PV DC SPD.<\/td>\n              <td>Must match or exceed the maximum PV DC system voltage according to design.<\/td>\n            <\/tr>\n\n            <tr>\n              <td><strong>Iimp<\/strong><\/td>\n              <td>Impulse current rating commonly used for Type 1 SPD.<\/td>\n              <td>Important for incoming protection and lightning-exposed systems.<\/td>\n            <\/tr>\n\n            <tr>\n              <td><strong>In<\/strong><\/td>\n              <td>Nominal discharge current, commonly used for Type 2 SPD.<\/td>\n              <td>Indicates repeated surge discharge capability under defined test conditions.<\/td>\n            <\/tr>\n\n            <tr>\n              <td><strong>Imax<\/strong><\/td>\n              <td>Maximum discharge current for Type 2 SPD under defined test conditions.<\/td>\n              <td>Useful for comparison, but should not be the only selection criterion.<\/td>\n            <\/tr>\n\n            <tr>\n              <td><strong>Up<\/strong><\/td>\n              <td>Voltage protection level.<\/td>\n              <td>Lower Up generally means better voltage limitation, but coordination and installation still matter.<\/td>\n            <\/tr>\n\n            <tr>\n              <td><strong>Uoc<\/strong><\/td>\n              <td>Open-circuit voltage of the combination wave generator, often used for Type 3 SPD testing.<\/td>\n              <td>Relevant for fine protection near sensitive equipment.<\/td>\n            <\/tr>\n\n            <tr>\n              <td><strong>Backup fuse \/ MCB<\/strong><\/td>\n              <td>Overcurrent protection coordinated with the SPD.<\/td>\n              <td>Must follow the SPD datasheet and available fault current.<\/td>\n            <\/tr>\n\n            <tr>\n              <td><strong>Remote signal contact<\/strong><\/td>\n              <td>Auxiliary contact for remote failure indication.<\/td>\n              <td>Useful for PV combiner boxes, industrial cabinets and monitored systems.<\/td>\n            <\/tr>\n          <\/tbody>\n        <\/table>\n      <\/div>\n    <\/div>\n  <\/section>\n\n  <section class=\"lysg-section\">\n    <div class=\"lysg-wrap\">\n      <div class=\"lysg-head\">\n        <span class=\"lysg-kicker\">Standards<\/span>\n        <h2>Which IEC standard should you check?<\/h2>\n        <p>\n          Standards are part of SPD selection. They help confirm whether the device is designed and tested for the correct application.\n        <\/p>\n      <\/div>\n\n      <div class=\"lysg-table-wrap\">\n        <table class=\"lysg-table\">\n          <thead>\n            <tr>\n              <th>Standard<\/th>\n              <th>Common application<\/th>\n              <th>Why it matters<\/th>\n            <\/tr>\n          <\/thead>\n          <tbody>\n            <tr>\n              <td><strong>IEC 61643-11<\/strong><\/td>\n              <td>Low-voltage AC surge protective devices.<\/td>\n              <td>Used for AC SPD performance, safety requirements, tests and ratings.<\/td>\n            <\/tr>\n\n            <tr>\n              <td><strong>IEC 61643-31<\/strong><\/td>\n              <td>SPDs for photovoltaic DC installations up to 1500V DC.<\/td>\n              <td>Important for PV combiner boxes, inverter DC inputs and solar DC-side protection.<\/td>\n            <\/tr>\n\n            <tr>\n              <td><strong>IEC 61643-12<\/strong><\/td>\n              <td>Application guidance for AC SPD selection and installation.<\/td>\n              <td>Useful for coordination, installation position and AC system protection design.<\/td>\n            <\/tr>\n\n            <tr>\n              <td><strong>IEC 61643-32<\/strong><\/td>\n              <td>Application guidance for PV SPD selection and installation.<\/td>\n              <td>Useful for PV-side SPD placement, selection and coordination.<\/td>\n            <\/tr>\n\n            <tr>\n              <td><strong>UL 1449<\/strong><\/td>\n              <td>North American SPD safety standard.<\/td>\n              <td>Important when the project requires UL-listed or North America-oriented SPD approval.<\/td>\n            <\/tr>\n          <\/tbody>\n        <\/table>\n      <\/div>\n\n      <div class=\"lysg-note\">\n        <strong>Procurement advice<\/strong>\n        Before bulk purchase, ask for the datasheet, standard reference, wiring diagram, backup protection recommendation, certification documents where available, and replacement module information.\n      <\/div>\n    <\/div>\n  <\/section>\n\n  <section class=\"lysg-section alt\">\n    <div class=\"lysg-wrap\">\n      <div class=\"lysg-head\">\n        <span class=\"lysg-kicker\">Installation affects selection<\/span>\n        <h2>Selection is not complete without installation checks<\/h2>\n        <p>\n          A suitable SPD can still perform poorly if it is installed in the wrong position or wired incorrectly.\n        <\/p>\n      <\/div>\n\n      <div class=\"lysg-grid-3\">\n        <div class=\"lysg-card\">\n          <h3>Install near the protected entry point<\/h3>\n          <p>\n            Main protection should be placed close to the incoming power point or distribution point it protects.\n          <\/p>\n        <\/div>\n\n        <div class=\"lysg-card\">\n          <h3>Keep connection leads short<\/h3>\n          <p>\n            Long and looped wiring increases residual voltage. Keep SPD connection leads short, straight and properly routed.\n          <\/p>\n        <\/div>\n\n        <div class=\"lysg-card\">\n          <h3>Ensure proper grounding<\/h3>\n          <p>\n            SPD performance depends on equipotential bonding and a low-impedance path for surge current.\n          <\/p>\n        <\/div>\n\n        <div class=\"lysg-card\">\n          <h3>Coordinate upstream and downstream SPDs<\/h3>\n          <p>\n            Type 1, Type 2 and Type 3 devices should work as a coordinated protection system, not isolated devices.\n          <\/p>\n        <\/div>\n\n        <div class=\"lysg-card\">\n          <h3>Check backup protection<\/h3>\n          <p>\n            The fuse or circuit breaker must match the manufacturer\u2019s recommendation and the available short-circuit current.\n          <\/p>\n        <\/div>\n\n        <div class=\"lysg-card\">\n          <h3>Plan maintenance and replacement<\/h3>\n          <p>\n            Visual indicators, remote signal contacts and replaceable cartridges make inspection easier in industrial and PV systems.\n          <\/p>\n        <\/div>\n      <\/div>\n    <\/div>\n  <\/section>\n\n  <section class=\"lysg-section\">\n    <div class=\"lysg-wrap\">\n      <div class=\"lysg-head\">\n        <span class=\"lysg-kicker\">Avoid mistakes<\/span>\n        <h2>Common SPD selection mistakes<\/h2>\n        <p>\n          These mistakes are common in sourcing, panel design and project specification.\n        <\/p>\n      <\/div>\n\n      <div class=\"lysg-grid-3\">\n        <div class=\"lysg-card\">\n          <h3>Choosing only by Imax<\/h3>\n          <p>\n            Imax is not the whole selection. Voltage, type, Up, installation position, backup protection and standard are also critical.\n          <\/p>\n        <\/div>\n\n        <div class=\"lysg-card\">\n          <h3>Using AC SPD for PV DC<\/h3>\n          <p>\n            A PV DC circuit needs a DC SPD designed for photovoltaic application and suitable Ucpv.\n          <\/p>\n        <\/div>\n\n        <div class=\"lysg-card\">\n          <h3>Ignoring Type 1 requirement<\/h3>\n          <p>\n            Lightning-exposed buildings and systems with external lightning protection may need Type 1 or Type 1+2 protection.\n          <\/p>\n        <\/div>\n\n        <div class=\"lysg-card\">\n          <h3>Wrong voltage rating<\/h3>\n          <p>\n            Uc or Ucpv must fit the actual system voltage, not only the general system name.\n          <\/p>\n        <\/div>\n\n        <div class=\"lysg-card\">\n          <h3>Ignoring earthing system<\/h3>\n          <p>\n            TT, TN and IT systems may require different protection modes and pole arrangements.\n          <\/p>\n        <\/div>\n\n        <div class=\"lysg-card\">\n          <h3>No replacement plan<\/h3>\n          <p>\n            For PV and industrial systems, visual status, remote signal and replacement cartridge design are important for maintenance.\n          <\/p>\n        <\/div>\n      <\/div>\n    <\/div>\n  <\/section>\n\n  <section class=\"lysg-section alt\">\n    <div class=\"lysg-wrap\">\n      <div class=\"lysg-head\">\n        <span class=\"lysg-kicker\">Buyer checklist<\/span>\n        <h2>What information should you send before asking for SPD selection?<\/h2>\n        <p>\n          Send these details to get a faster and more accurate recommendation from an SPD supplier.\n        <\/p>\n      <\/div>\n\n      <div class=\"lysg-table-wrap\">\n        <table class=\"lysg-table\">\n          <thead>\n            <tr>\n              <th>Information<\/th>\n              <th>Example<\/th>\n              <th>Why it matters<\/th>\n            <\/tr>\n          <\/thead>\n          <tbody>\n            <tr>\n              <td><strong>System type<\/strong><\/td>\n              <td>AC distribution board, PV DC combiner box, inverter input, control panel<\/td>\n              <td>Determines AC or DC SPD direction.<\/td>\n            <\/tr>\n\n            <tr>\n              <td><strong>System voltage<\/strong><\/td>\n              <td>230\/400V AC, 480V AC, 1000V DC, 1500V DC<\/td>\n              <td>Determines Uc or Ucpv selection.<\/td>\n            <\/tr>\n\n            <tr>\n              <td><strong>Installation position<\/strong><\/td>\n              <td>Main panel, sub-panel, combiner box, inverter side, terminal equipment<\/td>\n              <td>Determines Type 1, Type 2, Type 1+2 or Type 3 direction.<\/td>\n            <\/tr>\n\n            <tr>\n              <td><strong>Earthing system<\/strong><\/td>\n              <td>TT, TN-S, TN-C, IT<\/td>\n              <td>Determines wiring mode and pole arrangement.<\/td>\n            <\/tr>\n\n            <tr>\n              <td><strong>Lightning exposure<\/strong><\/td>\n              <td>External LPS, overhead line, exposed PV field, industrial site<\/td>\n              <td>Helps judge whether Type 1 or Type 1+2 is required.<\/td>\n            <\/tr>\n\n            <tr>\n              <td><strong>Required certification<\/strong><\/td>\n              <td>IEC, CE, TUV, UL, project approval<\/td>\n              <td>Prevents mismatch between product and market requirement.<\/td>\n            <\/tr>\n\n            <tr>\n              <td><strong>Panel or OEM requirement<\/strong><\/td>\n              <td>DIN rail width, remote signal, cartridge, private label, packaging<\/td>\n              <td>Important for OEM electrical assemblies and distributor sourcing.<\/td>\n            <\/tr>\n          <\/tbody>\n        <\/table>\n      <\/div>\n\n      <div class=\"lysg-note\">\n        <strong>For distributor or OEM bulk orders<\/strong>\n        If you already know the SPD direction but need to confirm the order details, see our complete\n        <a href=\"https:\/\/www.cnspd.com\/bulk-spd-order-checklist\/\" target=\"_blank\" rel=\"noopener\">SPD Bulk Order Checklist for Distributors and OEM Buyers<\/a>.\n        It covers model confirmation, certificate coverage, OEM label, packaging, sample approval, inspection, and delivery details before mass production.\n      <\/div>\n\n      <div class=\"lysg-actions\">\n        <a class=\"lysg-btn lysg-btn-primary leeyee-site-popup-btn\" href=\"javascript:void(0);\"><span>Send My SPD Requirement<\/span><\/a>\n      <\/div>\n    <\/div>\n  <\/section>\n\n  <section class=\"lysg-section\">\n    <div class=\"lysg-wrap\">\n      <div class=\"lysg-head\">\n        <span class=\"lysg-kicker\">Selection hub<\/span>\n        <h2>Choose the next page by your application<\/h2>\n        <p>\n          This SPD selection guide gives the decision framework. Use these pages for application-specific details and product direction.\n        <\/p>\n      <\/div>\n\n      <div class=\"lysg-link-grid\">\n        <a class=\"lysg-link-card\" href=\"https:\/\/www.cnspd.com\/solar-spd\/\" target=\"_blank\" rel=\"noopener\">\n          <strong>Solar SPD<\/strong>\n          <span>For DC and AC surge protection in photovoltaic systems.<\/span>\n        <\/a>\n\n        <a class=\"lysg-link-card\" href=\"https:\/\/www.cnspd.com\/dc-spd-up-to-1500v\/\" target=\"_blank\" rel=\"noopener\">\n          <strong>1500V DC SPD<\/strong>\n          <span>For high-voltage PV combiner boxes and inverter DC inputs.<\/span>\n        <\/a>\n\n        <a class=\"lysg-link-card\" href=\"https:\/\/www.cnspd.com\/1000v-dc-spd\/\" target=\"_blank\" rel=\"noopener\">\n          <strong>1000V DC SPD<\/strong>\n          <span>For common 1000V PV systems and DC-side protection.<\/span>\n        <\/a>\n\n        <a class=\"lysg-link-card\" href=\"https:\/\/www.cnspd.com\/din-rail-surge-protector\/\" target=\"_blank\" rel=\"noopener\">\n          <strong>DIN Rail Surge Protector<\/strong>\n          <span>For distribution boards, control panels, solar boxes and OEM assemblies.<\/span>\n        <\/a>\n\n        <a class=\"lysg-link-card\" href=\"https:\/\/www.cnspd.com\/type-2-din-rail-surge-protector\/\" target=\"_blank\" rel=\"noopener\">\n          <strong>Type 2 DIN Rail SPD<\/strong>\n          <span>For secondary surge protection in panels and cabinets.<\/span>\n        <\/a>\n\n        <a class=\"lysg-link-card\" href=\"https:\/\/www.cnspd.com\/type-1-2-din-rail-surge-protector\/\" target=\"_blank\" rel=\"noopener\">\n          <strong>Type 1+2 DIN Rail SPD<\/strong>\n          <span>For main panels, lightning-exposed sites and industrial systems.<\/span>\n        <\/a>\n\n        <a class=\"lysg-link-card\" href=\"https:\/\/www.cnspd.com\/spd-for-distribution-board\/\" target=\"_blank\" rel=\"noopener\">\n          <strong>SPD for Distribution Board<\/strong>\n          <span>For selecting SPDs in residential, commercial and industrial distribution boards.<\/span>\n        <\/a>\n\n        <a class=\"lysg-link-card\" href=\"https:\/\/www.cnspd.com\/surge-protection-for-inverters\/\" target=\"_blank\" rel=\"noopener\">\n          <strong>Surge Protection for Inverters<\/strong>\n          <span>For inverter-side DC and AC protection structure.<\/span>\n        <\/a>\n\n        <a class=\"lysg-link-card\" href=\"https:\/\/www.cnspd.com\/spd-type1-vs-type2-vs-type-3\/\" target=\"_blank\" rel=\"noopener\">\n          <strong>Type 1 vs Type 2 vs Type 3 SPD<\/strong>\n          <span>For understanding SPD types, test duties and typical installation positions.<\/span>\n        <\/a>\n      <\/div>\n    <\/div>\n  <\/section>\n\n  <section class=\"lysg-section alt\">\n    <div class=\"lysg-wrap\">\n      <div class=\"lysg-head\">\n        <span class=\"lysg-kicker\">Why LEEYEE<\/span>\n        <h2>LEEYEE support for SPD selection and sourcing<\/h2>\n        <p>\n          LEEYEE supplies surge protective devices for solar PV, distribution boards, industrial control panels, telecom, low-voltage systems and OEM electrical assemblies.\n        <\/p>\n      <\/div>\n\n      <div class=\"lysg-grid-3\">\n        <div class=\"lysg-card\">\n          <h3>AC and DC SPD coverage<\/h3>\n          <p>\n            Support for AC Type 1, Type 2, Type 1+2 and PV DC SPD options for 1000V and 1500V solar systems.\n          <\/p>\n        <\/div>\n\n        <div class=\"lysg-card\">\n          <h3>OEM and distributor support<\/h3>\n          <p>\n            Pluggable modules, DIN rail design, remote signal contacts, private label, packaging and model selection support.\n          <\/p>\n        <\/div>\n\n        <div class=\"lysg-card\">\n          <h3>Clear selection communication<\/h3>\n          <p>\n            We help buyers confirm system voltage, circuit type, SPD type, poles, standard, backup protection and application match before ordering.\n          <\/p>\n        <\/div>\n      <\/div>\n    <\/div>\n  <\/section>\n\n  <section class=\"lysg-section\">\n    <div class=\"lysg-wrap\">\n      <div class=\"lysg-head\">\n        <span class=\"lysg-kicker\">FAQ<\/span>\n        <h2>SPD selection guide FAQ<\/h2>\n        <p>\n          Short answers for buyers who need to choose the right surge protective device quickly.\n        <\/p>\n      <\/div>\n\n      <div class=\"lysg-faq\">\n        <details open>\n          <summary>How do I choose the right SPD?<\/summary>\n          <p>\n            Choose the right SPD by first identifying whether the protected circuit is AC or DC. Then select the SPD type by installation position, match Uc or Ucpv to the system voltage, check Iimp, In, Imax and Up, confirm poles and earthing system, and verify backup protection and applicable standard.\n          <\/p>\n        <\/details>\n\n        <details>\n          <summary>What is the first step in SPD selection?<\/summary>\n          <p>\n            The first step is to confirm whether the protected circuit is AC or DC. AC SPDs and DC SPDs are not interchangeable. PV DC systems should use DC SPDs designed for photovoltaic applications.\n          <\/p>\n        <\/details>\n\n        <details>\n          <summary>What is the difference between Type 1 and Type 2 SPD?<\/summary>\n          <p>\n            Type 1 SPD is typically used at the main incoming position or service entrance where lightning current duty may be required. Type 2 SPD is commonly used in distribution boards and sub-panels for secondary surge protection.\n          <\/p>\n        <\/details>\n\n        <details>\n          <summary>When should I choose Type 1+2 SPD?<\/summary>\n          <p>\n            Choose Type 1+2 SPD when the installation needs both lightning current capability and secondary surge protection in one device, such as main panels, lightning-exposed industrial sites, or solar PV systems with higher lightning risk.\n          <\/p>\n        <\/details>\n\n        <details>\n          <summary>Can I use an AC SPD on the DC side of a solar PV system?<\/summary>\n          <p>\n            No. The DC side of a solar PV system should use a DC SPD designed for photovoltaic applications. Selection should be based on Ucpv, PV system voltage, polarity, Type 2 or Type 1+2 requirement, and the correct DC-side standard.\n          <\/p>\n        <\/details>\n\n        <details>\n          <summary>What SPD should I choose for a 1500V solar system?<\/summary>\n          <p>\n            For a 1500V solar PV system, choose a PV-rated 1500V DC SPD. Confirm Ucpv, installation position, Type 2 or Type 1+2 requirement, In, Imax, Iimp if required, and DC disconnection design.\n          <\/p>\n        <\/details>\n\n        <details>\n          <summary>Is higher Imax always better?<\/summary>\n          <p>\n            Not always. Imax is only one comparison parameter. A suitable SPD must also match AC\/DC circuit type, voltage rating, SPD type, Up, poles, earthing system, backup protection, installation position and standard requirement.\n          <\/p>\n        <\/details>\n\n        <details>\n          <summary>Do SPDs need backup fuses or circuit breakers?<\/summary>\n          <p>\n            Many SPD installations require backup overcurrent protection. The correct fuse or circuit breaker must follow the SPD datasheet, available short-circuit current and installation standard.\n          <\/p>\n        <\/details>\n\n        <details>\n          <summary>What information should I send to an SPD supplier?<\/summary>\n          <p>\n            Send the system type, AC or DC side, system voltage, installation position, earthing system, lightning exposure, required certification, pole number, monitoring requirement and quantity.\n          <\/p>\n        <\/details>\n      <\/div>\n    <\/div>\n  <\/section>\n\n  <section class=\"lysg-cta\">\n    <div class=\"lysg-wrap\">\n      <div class=\"lysg-cta-grid\">\n        <div>\n          <h2>Need help selecting the right SPD?<\/h2>\n          <p>\n            Send us your system voltage, AC\/DC circuit, installation position, earthing system, lightning exposure and required standard. LEEYEE can help match a suitable SPD direction for solar PV, distribution boards, industrial cabinets and OEM assemblies.\n          <\/p>\n\n          <div class=\"lysg-actions\">\n            <a class=\"lysg-btn lysg-btn-secondary leeyee-site-popup-btn\" href=\"javascript:void(0);\">Request SPD Selection<\/a>\n          <\/div>\n        <\/div>\n\n        <div class=\"lysg-cta-list\">\n          <div class=\"lysg-cta-item\">\n            <strong>For solar PV<\/strong>\n            <span>1000V \/ 1500V DC SPD, PV combiner box SPD, inverter-side surge protection.<\/span>\n          <\/div>\n\n          <div class=\"lysg-cta-item\">\n            <strong>For distribution boards<\/strong>\n            <span>AC Type 2 SPD, Type 1+2 SPD, 1P\/2P\/3P\/4P DIN rail options.<\/span>\n          <\/div>\n\n          <div class=\"lysg-cta-item\">\n            <strong>For OEM buyers<\/strong>\n            <span>Pluggable modules, remote signal, custom label, packaging and sourcing support.<\/span>\n          <\/div>\n        <\/div>\n      <\/div>\n    <\/div>\n  <\/section>\n\n<\/div>\n\n<script type=\"application\/ld+json\">\n{\n  \"@context\": \"https:\/\/schema.org\",\n  \"@graph\": [\n    {\n      \"@type\": \"WebPage\",\n      \"@id\": \"https:\/\/www.cnspd.com\/spd-selection-guide\/\",\n      \"url\": \"https:\/\/www.cnspd.com\/spd-selection-guide\/\",\n      \"name\": \"SPD Selection Guide: Choose the Right AC, DC, Type 1, Type 2 SPD\",\n      \"description\": \"Practical SPD selection guide for AC and DC systems. 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Compare AC vs DC SPD, Type 1 vs Type 2 vs Type 1+2, voltage rating, poles, discharge current,...","protected":false},"author":18,"featured_media":0,"parent":0,"menu_order":0,"comment_status":"closed","ping_status":"closed","template":"","meta":{"footnotes":""},"class_list":["post-29598","page","type-page","status-publish","hentry"],"acf":[],"yoast_head":"<!-- This site is optimized with the Yoast SEO plugin v27.9 - https:\/\/yoast.com\/product\/yoast-seo-wordpress\/ -->\n<title>SPD Selection Guide: Choose the Right AC, DC, Type 1, Type 2 SPD | LEEYEE<\/title>\n<meta name=\"description\" content=\"Practical SPD selection guide for AC and DC systems. 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