{"id":4374,"date":"2026-08-29T13:57:07","date_gmt":"2026-08-29T05:57:07","guid":{"rendered":"https:\/\/cnkuangya.com\/?p=4374"},"modified":"2026-09-05T10:49:54","modified_gmt":"2026-09-05T02:49:54","slug":"dc-spd-specifications","status":"publish","type":"post","link":"https:\/\/cnkuangya.com\/fr\/blog\/dc-spd-specifications\/","title":{"rendered":"Comment lire l'\u00e9tiquette d'un parafoudre CC : explications sur les classes II, Ucpv, In, Imax, Up et Iscpv"},"content":{"rendered":"<p class=\"wp-block-paragraph\">Un parafoudre DC peut sembler simple \u00e0 l'ext\u00e9rieur, mais les marquages imprim\u00e9s sur son \u00e9tiquette contiennent des informations importantes sur l'endroit o\u00f9 le parafoudre peut \u00eatre utilis\u00e9 et sur ses performances.<\/p>\n\n\n\n<p class=\"wp-block-paragraph\">Prenons cet exemple d'un parafoudre solaire DC 1000V :<\/p>\n\n\n\n<blockquote class=\"wp-block-quote is-layout-flow wp-block-quote-is-layout-flow\">\n<p class=\"wp-block-paragraph\"><strong>Ucpv : 1000V DC<\/strong><br><strong>Classe II<\/strong><br><strong>In : 20kA<\/strong><br><strong>Imax : 40kA<\/strong><br><strong>Up : 4,0kV<\/strong><br><strong>Iscpv : 10kA<\/strong><br><strong>-40\u00b0C \u00e0 +85\u00b0C<\/strong><br><strong>Int\u00e9rieur, IP20<\/strong><\/p>\n<\/blockquote>\n\n\n\n<p class=\"wp-block-paragraph\">Pour un ing\u00e9nieur \u00e9lectricien exp\u00e9riment\u00e9, ces abr\u00e9viations sont famili\u00e8res.<\/p>\n\n\n\n<p class=\"wp-block-paragraph\">Pour un acheteur, un distributeur, un installateur solaire ou un responsable des achats de projet, cependant, elles peuvent facilement devenir d\u00e9routantes.<\/p>\n\n\n\n<p class=\"wp-block-paragraph\">Est-ce que <strong>Classe II<\/strong> signifie un parafoudre de type 2 ?<\/p>\n\n\n\n<p class=\"wp-block-paragraph\">Est-ce que <strong>40kA Imax<\/strong> automatiquement meilleur que 20kA ?<\/p>\n\n\n\n<p class=\"wp-block-paragraph\">Pourquoi le m\u00eame parafoudre affiche-t-il \u00e0 la fois <strong>1000V<\/strong> et <strong>4,0 kV<\/strong>?<\/p>\n\n\n\n<p class=\"wp-block-paragraph\">Est-ce que <strong>Iscpv 10kA<\/strong> signifie-t-il que le parafoudre peut d\u00e9charger une surtension de foudre de 10kA ?<\/p>\n\n\n\n<p class=\"wp-block-paragraph\">La r\u00e9ponse courte est : <strong>aucun chiffre unique ne d\u00e9crit l'ensemble du parafoudre.<\/strong><\/p>\n\n\n\n<p class=\"wp-block-paragraph\">Un parafoudre DC doit \u00eatre interpr\u00e9t\u00e9 comme un ensemble complet de caract\u00e9ristiques \u00e9lectriques. Si vous d\u00e9butez dans la protection contre les surtensions, comprenez d'abord <strong><a href=\"https:\/\/cnkuangya.com\/fr\/blog\/what-is-dc-spd-solar-spd-pv-protection\/\">comment un parafoudre DC fonctionne dans un syst\u00e8me solaire photovolta\u00efque<\/a><\/strong> peut faciliter le respect de ces sp\u00e9cifications.<\/p>\n\n\n\n<p class=\"wp-block-paragraph\">Ce guide explique comment lire correctement ces marquages, en utilisant un <strong>parafoudre (SPD) CC de classe II 1000V<\/strong> comme exemple pratique.<\/p>\n\n\n\n<p class=\"wp-block-paragraph\">Regardez ce guide rapide pour apprendre \u00e0 lire les marquages cl\u00e9s sur la plaque signal\u00e9tique d'un parafoudre DC.<\/p>\n\n\n\n<figure class=\"wp-block-embed is-type-video is-provider-youtube wp-block-embed-youtube wp-embed-aspect-9-16 wp-has-aspect-ratio\"><div class=\"wp-block-embed__wrapper\">\n<iframe loading=\"lazy\" title=\"Do you know how to read an SPD nameplate?\" width=\"563\" height=\"1000\" src=\"https:\/\/www.youtube.com\/embed\/bDrAj5JLWXA?feature=oembed\" frameborder=\"0\" allow=\"accelerometer; autoplay; clipboard-write; encrypted-media; gyroscope; picture-in-picture; web-share\" referrerpolicy=\"strict-origin-when-cross-origin\" allowfullscreen><\/iframe>\n<\/div><figcaption class=\"wp-element-caption\">Un guide rapide pour lire les marquages principaux sur un parafoudre DC, incluant Ucpv, Type 2, In, Imax et Up.<\/figcaption><\/figure>\n\n\n\n<hr class=\"wp-block-separator has-alpha-channel-opacity\"\/>\n\n\n\n<h1 class=\"wp-block-heading\">R\u00e9ponse rapide : que signifient les principales sp\u00e9cifications des SPD CC ?<\/h1>\n\n\n\n<p class=\"wp-block-paragraph\">Avant d'entrer dans les d\u00e9tails techniques, le tableau ci-dessous donne un aper\u00e7u simple.<\/p>\n\n\n\n<figure class=\"wp-block-table\"><table class=\"has-fixed-layout\"><thead><tr><th>Marquage<\/th><th>Exemple<\/th><th>Signification simple<\/th><\/tr><\/thead><tbody><tr><td>Ucpv<\/td><td>1000V DC<\/td><td>Tension de fonctionnement continu maximale pour l'application photovolta\u00efque<\/td><\/tr><tr><td>Classe II<\/td><td>Classe II<\/td><td>Parafoudre test\u00e9 de classe II, associ\u00e9 \u00e0 une protection contre les surtensions de type 2<\/td><\/tr><tr><td>En<\/td><td>20kA<\/td><td>Courant de d\u00e9charge nominal<\/td><\/tr><tr><td>Imax<\/td><td>40kA<\/td><td>Courant de d\u00e9charge maximal<\/td><\/tr><tr><td>Haut de la page<\/td><td>4,0 kV<\/td><td>Niveau de protection en tension d\u00e9clar\u00e9<\/td><\/tr><tr><td>Iscpv<\/td><td>10kA<\/td><td>Courant de court-circuit PV nominal du parafoudre<\/td><\/tr><tr><td>Temp\u00e9rature<\/td><td>-40\u00b0C \u00e0 +85\u00b0C<\/td><td>Plage de temp\u00e9rature de fonctionnement d\u00e9clar\u00e9e<\/td><\/tr><tr><td>Humidit\u00e9<\/td><td>5%\u201395%<\/td><td>Plage d'humidit\u00e9 d\u00e9clar\u00e9e<\/td><\/tr><tr><td>Int\u00e9rieur<\/td><td>Int\u00e9rieur<\/td><td>Destin\u00e9 \u00e0 des conditions d'installation prot\u00e9g\u00e9es<\/td><\/tr><tr><td>IP20<\/td><td>IP20<\/td><td>Degr\u00e9 de protection du bo\u00eetier du parafoudre<\/td><\/tr><\/tbody><\/table><\/figure>\n\n\n\n<figure class=\"wp-block-image size-large\"><img loading=\"lazy\" decoding=\"async\" width=\"1024\" height=\"683\" src=\"https:\/\/cnkuangya.com\/wp-content\/uploads\/2026\/08\/dc-spd-label-parameters-explained-1024x683.jpg\" alt=\"1000V DC SPD label showing Ucpv, Class II, In, Imax, Up and Iscpv specifications\" class=\"wp-image-4383\" srcset=\"https:\/\/cnkuangya.com\/wp-content\/uploads\/2026\/08\/dc-spd-label-parameters-explained-1024x683.jpg 1024w, https:\/\/cnkuangya.com\/wp-content\/uploads\/2026\/08\/dc-spd-label-parameters-explained-300x200.jpg 300w, https:\/\/cnkuangya.com\/wp-content\/uploads\/2026\/08\/dc-spd-label-parameters-explained-768x512.jpg 768w, https:\/\/cnkuangya.com\/wp-content\/uploads\/2026\/08\/dc-spd-label-parameters-explained-18x12.jpg 18w, https:\/\/cnkuangya.com\/wp-content\/uploads\/2026\/08\/dc-spd-label-parameters-explained-600x400.jpg 600w, https:\/\/cnkuangya.com\/wp-content\/uploads\/2026\/08\/dc-spd-label-parameters-explained.jpg 1535w\" sizes=\"auto, (max-width: 1024px) 100vw, 1024px\" \/><figcaption class=\"wp-element-caption\">Une \u00e9tiquette de parafoudre 1000V DC contient plusieurs valeurs nominales diff\u00e9rentes, chacune d\u00e9crivant une caract\u00e9ristique \u00e9lectrique distincte.<\/figcaption><\/figure>\n\n\n\n<p class=\"wp-block-paragraph\">Le point le plus important est :<\/p>\n\n\n\n<blockquote class=\"wp-block-quote is-layout-flow wp-block-quote-is-layout-flow\">\n<p class=\"wp-block-paragraph\"><strong>Ne comparez pas les parafoudres DC uniquement sur la base de la valeur kA la plus \u00e9lev\u00e9e imprim\u00e9e sur l'\u00e9tiquette.<\/strong><\/p>\n<\/blockquote>\n\n\n\n<p class=\"wp-block-paragraph\">Par exemple, <strong>Imax 40kA<\/strong>, <strong>In 20kA<\/strong> et <strong>Iscpv 10kA<\/strong> utilisent tous l'unit\u00e9 kA, mais ils d\u00e9crivent des caract\u00e9ristiques totalement diff\u00e9rentes.<\/p>\n\n\n\n<hr class=\"wp-block-separator has-alpha-channel-opacity\"\/>\n\n\n\n<h1 class=\"wp-block-heading\">Un meilleur ordre pour la lecture d'une \u00e9tiquette de parafoudre CC<\/h1>\n\n\n\n<p class=\"wp-block-paragraph\">Lorsque les acheteurs voient pour la premi\u00e8re fois une fiche technique de parafoudre, ils commencent souvent par le chiffre le plus \u00e9lev\u00e9.<\/p>\n\n\n\n<p class=\"wp-block-paragraph\">C'est g\u00e9n\u00e9ralement la mauvaise approche.<\/p>\n\n\n\n<p class=\"wp-block-paragraph\">Un ordre de lecture plus utile est :<\/p>\n\n\n\n<ol class=\"wp-block-list\">\n<li>Confirmer qu'il est con\u00e7u pour <strong>PV DC<\/strong><\/li>\n\n\n\n<li>V\u00e9rifier <strong>Ucpv<\/strong><\/li>\n\n\n\n<li>V\u00e9rifier le <strong>Type de parafoudre \/ Classe d'essai<\/strong><\/li>\n\n\n\n<li>V\u00e9rifier <strong>Haut de la page<\/strong><\/li>\n\n\n\n<li>V\u00e9rifier <strong>In et Imax<\/strong><\/li>\n\n\n\n<li>V\u00e9rifier <strong>Iscpv<\/strong><\/li>\n\n\n\n<li>V\u00e9rifier le c\u00e2blage et la configuration de la protection<\/li>\n\n\n\n<li>V\u00e9rifier les caract\u00e9ristiques environnementales<\/li>\n\n\n\n<li>Confirmer la norme et la documentation pertinentes<\/li>\n<\/ol>\n\n\n\n<p class=\"wp-block-paragraph\">Cet ordre permet d'\u00e9carter les produits inadapt\u00e9s avant de comparer les chiffres de courant de choc nominaux.<\/p>\n\n\n\n<p class=\"wp-block-paragraph\">VIOX utilise une approche similaire consistant \u00e0 \u201c rejeter d'abord les sp\u00e9cifications incompatibles \u201d dans son guide de fiches techniques ; pour les applications photovolta\u00efques, cette logique devient encore plus importante car l'Ucpv et le comportement en court-circuit du PV n\u00e9cessitent une attention particuli\u00e8re.<\/p>\n\n\n\n<hr class=\"wp-block-separator has-alpha-channel-opacity\"\/>\n\n\n\n<h1 class=\"wp-block-heading\">Que signifie la classe II sur un parafoudre CC ?<\/h1>\n\n\n\n<p class=\"wp-block-paragraph\">L'un des premiers marquages sur l'\u00e9tiquette d'exemple est :<\/p>\n\n\n\n<blockquote class=\"wp-block-quote is-layout-flow wp-block-quote-is-layout-flow\">\n<p class=\"wp-block-paragraph\"><strong>Classe II<\/strong><\/p>\n<\/blockquote>\n\n\n\n<p class=\"wp-block-paragraph\">Ceci fait <strong>pas<\/strong> signifie une qualit\u00e9 de seconde classe.<\/p>\n\n\n\n<p class=\"wp-block-paragraph\">Les classes I, II et III font r\u00e9f\u00e9rence aux classifications de test normalis\u00e9es des parafoudres (SPD), et non aux niveaux de qualit\u00e9 des produits.<\/p>\n\n\n\n<p class=\"wp-block-paragraph\">Pour les parafoudres photovolta\u00efques, un parafoudre de type 2 est associ\u00e9 \u00e0 <strong>un test de classe II<\/strong>.<\/p>\n\n\n\n<p class=\"wp-block-paragraph\">C'est pourquoi diff\u00e9rents fabricants ou fiches techniques peuvent utiliser des marquages tels que :<\/p>\n\n\n\n<ul class=\"wp-block-list\">\n<li>Type 2<\/li>\n\n\n\n<li>T2<\/li>\n\n\n\n<li>Classe II<\/li>\n<\/ul>\n\n\n\n<p class=\"wp-block-paragraph\">Ils font r\u00e9f\u00e9rence \u00e0 des concepts de classification et de test \u00e9troitement li\u00e9s, bien que techniquement <strong>\u201c Type \u201d et \u201c classe de test \u201d ne sont pas simplement deux orthographes diff\u00e9rentes du m\u00eame terme<\/strong>.<\/p>\n\n\n\n<p class=\"wp-block-paragraph\">Pour la plupart des acheteurs, la relation pratique peut \u00eatre comprise comme suit :<\/p>\n\n\n\n<figure class=\"wp-block-table\"><table class=\"has-fixed-layout\"><thead><tr><th>Classification des parafoudres<\/th><th>Classe d'essai<\/th><th>Param\u00e8tre de courant principal<\/th><th>Forme d'onde d'essai commune<\/th><\/tr><\/thead><tbody><tr><td>Type 1<\/td><td>Classe I<\/td><td>Iimp<\/td><td>10\/350 \u03bcs<\/td><\/tr><tr><td>Type 2<\/td><td>Classe II<\/td><td>In \/ Imax<\/td><td>8\/20 \u03bcs<\/td><\/tr><tr><td>Type 3<\/td><td>Classe III<\/td><td>Autres param\u00e8tres d'essai coordonn\u00e9s<\/td><td>Essai par onde combin\u00e9e<\/td><\/tr><\/tbody><\/table><\/figure>\n\n\n\n<figure class=\"wp-block-image size-large\"><img loading=\"lazy\" decoding=\"async\" width=\"1024\" height=\"683\" src=\"https:\/\/cnkuangya.com\/wp-content\/uploads\/2026\/08\/class-i-vs-class-ii-dc-spd-1024x683.jpg\" alt=\"Class I Type 1 vs Class II Type 2 DC SPD comparison\" class=\"wp-image-4384\" srcset=\"https:\/\/cnkuangya.com\/wp-content\/uploads\/2026\/08\/class-i-vs-class-ii-dc-spd-1024x683.jpg 1024w, https:\/\/cnkuangya.com\/wp-content\/uploads\/2026\/08\/class-i-vs-class-ii-dc-spd-300x200.jpg 300w, https:\/\/cnkuangya.com\/wp-content\/uploads\/2026\/08\/class-i-vs-class-ii-dc-spd-768x512.jpg 768w, https:\/\/cnkuangya.com\/wp-content\/uploads\/2026\/08\/class-i-vs-class-ii-dc-spd-18x12.jpg 18w, https:\/\/cnkuangya.com\/wp-content\/uploads\/2026\/08\/class-i-vs-class-ii-dc-spd-600x400.jpg 600w, https:\/\/cnkuangya.com\/wp-content\/uploads\/2026\/08\/class-i-vs-class-ii-dc-spd.jpg 1536w\" sizes=\"auto, (max-width: 1024px) 100vw, 1024px\" \/><figcaption class=\"wp-element-caption\">Les classes I et II d\u00e9crivent des cycles d'essai diff\u00e9rents pour les parafoudres, et non des niveaux de qualit\u00e9 de produit diff\u00e9rents.<\/figcaption><\/figure>\n\n\n\n<p class=\"wp-block-paragraph\">Pour l'exemple dans cet article :<\/p>\n\n\n\n<blockquote class=\"wp-block-quote is-layout-flow wp-block-quote-is-layout-flow\">\n<p class=\"wp-block-paragraph\"><strong>Classe II \u2192 Direction d'application de type 2<\/strong><\/p>\n<\/blockquote>\n\n\n\n<p class=\"wp-block-paragraph\">et par cons\u00e9quent, les param\u00e8tres de courant les plus importants indiqu\u00e9s sont :<\/p>\n\n\n\n<blockquote class=\"wp-block-quote is-layout-flow wp-block-quote-is-layout-flow\">\n<p class=\"wp-block-paragraph\"><strong>In = 20kA<\/strong><br><strong>Imax = 40kA<\/strong><\/p>\n<\/blockquote>\n\n\n\n<hr class=\"wp-block-separator has-alpha-channel-opacity\"\/>\n\n\n\n<h1 class=\"wp-block-heading\">La classe II est-elle moins performante que la classe I ?<\/h1>\n\n\n\n<p class=\"wp-block-paragraph\">Non.<\/p>\n\n\n\n<p class=\"wp-block-paragraph\">C'est l'un des malentendus les plus courants lors de la comparaison des parafoudres (SPD).<\/p>\n\n\n\n<p class=\"wp-block-paragraph\">Les termes Classe I et Classe II peuvent ressembler \u00e0 un classement :<\/p>\n\n\n\n<blockquote class=\"wp-block-quote is-layout-flow wp-block-quote-is-layout-flow\">\n<p class=\"wp-block-paragraph\">Classe I = meilleur<br>Classe II = moins cher ou moins performant<\/p>\n<\/blockquote>\n\n\n\n<p class=\"wp-block-paragraph\">Ce n'est pas ainsi que fonctionne la classification des parafoudres (SPD).<\/p>\n\n\n\n<p class=\"wp-block-paragraph\">Ils sont destin\u00e9s \u00e0 <strong>diff\u00e9rentes conditions de surtension<\/strong>.<\/p>\n\n\n\n<p class=\"wp-block-paragraph\">Un parafoudre de Type 1 \/ Classe I est \u00e9valu\u00e9 pour sa capacit\u00e9 \u00e0 supporter des courants de choc de foudre, l\u00e0 o\u00f9 un courant de foudre partiel peut devoir \u00eatre \u00e9vacu\u00e9 au point d'installation.<\/p>\n\n\n\n<p class=\"wp-block-paragraph\">Un parafoudre de Type 2 \/ Classe II est couramment utilis\u00e9 pour limiter les surtensions transitoires caus\u00e9es par les effets induits de la foudre et les man\u0153uvres de commutation.<\/p>\n\n\n\n<p class=\"wp-block-paragraph\">Par cons\u00e9quent, la bonne question n'est pas :<\/p>\n\n\n\n<blockquote class=\"wp-block-quote is-layout-flow wp-block-quote-is-layout-flow\">\n<p class=\"wp-block-paragraph\">Quelle classe est la meilleure ?<\/p>\n<\/blockquote>\n\n\n\n<p class=\"wp-block-paragraph\">C'est :<\/p>\n\n\n\n<blockquote class=\"wp-block-quote is-layout-flow wp-block-quote-is-layout-flow\">\n<p class=\"wp-block-paragraph\"><strong>Quel type de parafoudre (SPD) est requis \u00e0 ce point d'installation ?<\/strong><\/p>\n<\/blockquote>\n\n\n\n<p class=\"wp-block-paragraph\">Un parafoudre de type 1 n'est pas automatiquement le choix appropri\u00e9 pour chaque installation photovolta\u00efque, et un parafoudre de type 2 n'est pas automatiquement inadapt\u00e9 simplement parce qu'un type 1 existe.<\/p>\n\n\n\n<p class=\"wp-block-paragraph\">Si vous avez besoin d'une explication d\u00e9taill\u00e9e sur cette question de s\u00e9lection, consultez notre guide :<\/p>\n\n\n\n<p class=\"wp-block-paragraph\"><strong><a href=\"https:\/\/cnkuangya.com\/fr\/blog\/type-1-vs-type-2-spd-for-solar\/\">SPD CC Type 1 vs Type 2 vs Type 1+2 pour le solaire photovolta\u00efque<\/a><\/strong><\/p>\n\n\n\n<p class=\"wp-block-paragraph\">Votre article existant approfondit les sujets de l'exposition \u00e0 la foudre, de l'emplacement de l'installation et du moment o\u00f9 la capacit\u00e9 de Type 1 doit \u00eatre \u00e9valu\u00e9e.<\/p>\n\n\n\n<hr class=\"wp-block-separator has-alpha-channel-opacity\"\/>\n\n\n\n<h1 class=\"wp-block-heading\">SPD CC Classe I vs Classe II : Quelle est la r\u00e9elle diff\u00e9rence ?<\/h1>\n\n\n\n<p class=\"wp-block-paragraph\">La plus grande diff\u00e9rence technique devient plus claire lorsque nous examinons le courant d'essai.<\/p>\n\n\n\n<h2 class=\"wp-block-heading\">Classe I \/ Type 1<\/h2>\n\n\n\n<p class=\"wp-block-paragraph\">Un SPD de Type 1 est associ\u00e9 \u00e0 une valeur nominale de courant d'impulsion :<\/p>\n\n\n\n<blockquote class=\"wp-block-quote is-layout-flow wp-block-quote-is-layout-flow\">\n<p class=\"wp-block-paragraph\"><strong>Iimp<\/strong><\/p>\n<\/blockquote>\n\n\n\n<p class=\"wp-block-paragraph\">et un <strong>10\/350 \u03bcs<\/strong> La forme d'onde de courant est g\u00e9n\u00e9ralement associ\u00e9e aux essais de classe I.<\/p>\n\n\n\n<p class=\"wp-block-paragraph\">La forme d'onde 10\/350 \u03bcs repr\u00e9sente une contrainte en courant et en \u00e9nergie tr\u00e8s diff\u00e9rente de la forme d'onde 8\/20 \u03bcs utilis\u00e9e pour l'\u00e9valuation de type 2.<\/p>\n\n\n\n<p class=\"wp-block-paragraph\">Cela signifie que :<\/p>\n\n\n\n<blockquote class=\"wp-block-quote is-layout-flow wp-block-quote-is-layout-flow\">\n<p class=\"wp-block-paragraph\"><strong>Iimp ne peut pas \u00eatre directement compar\u00e9 \u00e0 Imax simplement parce que les deux sont exprim\u00e9s en kA.<\/strong><\/p>\n<\/blockquote>\n\n\n\n<p class=\"wp-block-paragraph\">Par exemple :<\/p>\n\n\n\n<p class=\"wp-block-paragraph\"><strong>Iimp = 12,5 kA<\/strong><\/p>\n\n\n\n<p class=\"wp-block-paragraph\">et<\/p>\n\n\n\n<p class=\"wp-block-paragraph\"><strong>Imax = 40kA<\/strong><\/p>\n\n\n\n<p class=\"wp-block-paragraph\">ne signifie pas que le produit de type 2 de 40 kA est \u201c plus robuste \u201d.\u201d<\/p>\n\n\n\n<p class=\"wp-block-paragraph\">Ils font r\u00e9f\u00e9rence \u00e0 des formes d'onde d'essai et \u00e0 des caract\u00e9ristiques de performance diff\u00e9rentes.<\/p>\n\n\n\n<hr class=\"wp-block-separator has-alpha-channel-opacity\"\/>\n\n\n\n<h2 class=\"wp-block-heading\">Classe II \/ Type 2<\/h2>\n\n\n\n<p class=\"wp-block-paragraph\">Un parafoudre de type 2 est principalement caract\u00e9ris\u00e9 par :<\/p>\n\n\n\n<ul class=\"wp-block-list\">\n<li>En<\/li>\n\n\n\n<li>Imax<\/li>\n\n\n\n<li>Haut de la page<\/li>\n\n\n\n<li>Ucpv pour les applications photovolta\u00efques<\/li>\n<\/ul>\n\n\n\n<p class=\"wp-block-paragraph\">La forme d'onde de courant 8\/20 \u03bcs est associ\u00e9e aux essais de courant de d\u00e9charge de classe II.<\/p>\n\n\n\n<p class=\"wp-block-paragraph\">Les parafoudres CC de type 2 sont g\u00e9n\u00e9ralement \u00e9valu\u00e9s pour une utilisation dans des emplacements tels que :<\/p>\n\n\n\n<ul class=\"wp-block-list\">\n<li>Bo\u00eetes de raccordement PV<\/li>\n\n\n\n<li>\u00c9quipement de distribution CC<\/li>\n\n\n\n<li>entr\u00e9es CC de l'onduleur<\/li>\n\n\n\n<li>autres points de protection photovolta\u00efque coordonn\u00e9s<\/li>\n<\/ul>\n\n\n\n<p class=\"wp-block-paragraph\">Cependant, le type de parafoudre final doit toujours d\u00e9pendre de la conception r\u00e9elle de la protection contre la foudre et des conditions d'installation.<\/p>\n\n\n\n<figure class=\"wp-block-image size-large\"><img loading=\"lazy\" decoding=\"async\" width=\"1024\" height=\"683\" src=\"https:\/\/cnkuangya.com\/wp-content\/uploads\/2026\/08\/spd-10-350-vs-8-20-waveform-1024x683.jpg\" alt=\"10\/350 microsecond and 8\/20 microsecond SPD surge current waveform comparison\" class=\"wp-image-4385\" srcset=\"https:\/\/cnkuangya.com\/wp-content\/uploads\/2026\/08\/spd-10-350-vs-8-20-waveform-1024x683.jpg 1024w, https:\/\/cnkuangya.com\/wp-content\/uploads\/2026\/08\/spd-10-350-vs-8-20-waveform-300x200.jpg 300w, https:\/\/cnkuangya.com\/wp-content\/uploads\/2026\/08\/spd-10-350-vs-8-20-waveform-768x512.jpg 768w, https:\/\/cnkuangya.com\/wp-content\/uploads\/2026\/08\/spd-10-350-vs-8-20-waveform-18x12.jpg 18w, https:\/\/cnkuangya.com\/wp-content\/uploads\/2026\/08\/spd-10-350-vs-8-20-waveform-600x400.jpg 600w, https:\/\/cnkuangya.com\/wp-content\/uploads\/2026\/08\/spd-10-350-vs-8-20-waveform.jpg 1536w\" sizes=\"auto, (max-width: 1024px) 100vw, 1024px\" \/><figcaption class=\"wp-element-caption\">Iimp et Imax ne peuvent pas \u00eatre compar\u00e9s uniquement par leurs valeurs en kA car ils sont associ\u00e9s \u00e0 des formes d'onde d'essai diff\u00e9rentes.<\/figcaption><\/figure>\n\n\n\n<hr class=\"wp-block-separator has-alpha-channel-opacity\"\/>\n\n\n\n<h1 class=\"wp-block-heading\">Qu'en est-il de la classe III ?<\/h1>\n\n\n\n<p class=\"wp-block-paragraph\">La classe III existe au sein de la classification g\u00e9n\u00e9rale des parafoudres, mais elle ne devrait pas devenir le sujet principal lors de la discussion sur la s\u00e9lection typique des parafoudres CC photovolta\u00efques.<\/p>\n\n\n\n<p class=\"wp-block-paragraph\">La protection de classe III est g\u00e9n\u00e9ralement associ\u00e9e \u00e0 une protection fine coordonn\u00e9e \u00e0 proximit\u00e9 des \u00e9quipements sensibles.<\/p>\n\n\n\n<p class=\"wp-block-paragraph\">Pour la protection CC des installations solaires photovolta\u00efques, les acheteurs rencontreront beaucoup plus couramment :<\/p>\n\n\n\n<ul class=\"wp-block-list\">\n<li>Type 2 \/ Classe II<\/li>\n\n\n\n<li>Type 1<\/li>\n\n\n\n<li>Type 1+2<\/li>\n<\/ul>\n\n\n\n<p class=\"wp-block-paragraph\">C'est pourquoi cet article se concentre principalement sur <strong>La classe II et sa relation avec les parafoudres CC de type 2<\/strong>, plut\u00f4t que de traiter les classes I, II et III comme trois cat\u00e9gories de produits photovolta\u00efques aussi courantes les unes que les autres.<\/p>\n\n\n\n<hr class=\"wp-block-separator has-alpha-channel-opacity\"\/>\n\n\n\n<h1 class=\"wp-block-heading\">Que signifie Ucpv 1000V CC ?<\/h1>\n\n\n\n<p class=\"wp-block-paragraph\">L'\u00e9tiquette d'exemple indique :<\/p>\n\n\n\n<blockquote class=\"wp-block-quote is-layout-flow wp-block-quote-is-layout-flow\">\n<p class=\"wp-block-paragraph\"><strong>Ucpv : 1000V DC<\/strong><\/p>\n<\/blockquote>\n\n\n\n<p class=\"wp-block-paragraph\">Ucpv signifie :<\/p>\n\n\n\n<p class=\"wp-block-paragraph\"><strong>Tension maximale de fonctionnement continu pour application photovolta\u00efque<\/strong><\/p>\n\n\n\n<p class=\"wp-block-paragraph\">En termes simples :<\/p>\n\n\n\n<blockquote class=\"wp-block-quote is-layout-flow wp-block-quote-is-layout-flow\">\n<p class=\"wp-block-paragraph\"><strong>Ucpv tells you the maximum DC voltage that may be continuously applied to the SPD&#8217;s mode of protection.<\/strong><\/p>\n<\/blockquote>\n\n\n\n<p class=\"wp-block-paragraph\">La norme IEC 61643-32 d\u00e9finit l'Ucpv essentiellement de cette mani\u00e8re et stipule qu'elle doit \u00eatre \u00e9gale ou sup\u00e9rieure \u00e0 la tension maximale en circuit ouvert photovolta\u00efque correspondant \u00e0 l'installation.<\/p>\n\n\n\n<p class=\"wp-block-paragraph\">Cela fait de l'Ucpv l'une des premi\u00e8res sp\u00e9cifications \u00e0 v\u00e9rifier lors du choix d'un parafoudre DC pour installation solaire.<\/p>\n\n\n\n<hr class=\"wp-block-separator has-alpha-channel-opacity\"\/>\n\n\n\n<h1 class=\"wp-block-heading\">Un \u201c syst\u00e8me 1000V \u201d signifie-t-il automatiquement que vous avez besoin d'un parafoudre 1000V ?<\/h1>\n\n\n\n<p class=\"wp-block-paragraph\">Pas n\u00e9cessairement.<\/p>\n\n\n\n<p class=\"wp-block-paragraph\">Ceci est important.<\/p>\n\n\n\n<p class=\"wp-block-paragraph\">Un syst\u00e8me photovolta\u00efque ne doit pas \u00eatre \u00e9valu\u00e9 uniquement \u00e0 l'aide d'une \u00e9tiquette nominale pratique telle que :<\/p>\n\n\n\n<blockquote class=\"wp-block-quote is-layout-flow wp-block-quote-is-layout-flow\">\n<p class=\"wp-block-paragraph\">syst\u00e8me solaire 1000V<\/p>\n<\/blockquote>\n\n\n\n<p class=\"wp-block-paragraph\">La tension continue maximale r\u00e9elle d'une cha\u00eene photovolta\u00efque d\u00e9pend de facteurs incluant :<\/p>\n\n\n\n<ul class=\"wp-block-list\">\n<li>la tension en circuit ouvert du module, Voc<\/li>\n\n\n\n<li>le nombre de modules connect\u00e9s en s\u00e9rie<\/li>\n\n\n\n<li>la temp\u00e9rature de conception minimale<\/li>\n\n\n\n<li>le coefficient de temp\u00e9rature de tension du module<\/li>\n<\/ul>\n\n\n\n<p class=\"wp-block-paragraph\">La tension en circuit ouvert d'un module photovolta\u00efque augmente normalement lorsque la temp\u00e9rature chute.<\/p>\n\n\n\n<p class=\"wp-block-paragraph\">Pour une explication plus d\u00e9taill\u00e9e de la tension des champs photovolta\u00efques, de la conception des cha\u00eenes et des exigences syst\u00e8me associ\u00e9es, veuillez consulter notre <strong><a href=\"https:\/\/cnkuangya.com\/fr\/blog\/iec-62548-explained\/\">Guide de conception des champs photovolta\u00efques selon la norme CEI 62548<\/a><\/strong>.<\/p>\n\n\n\n<p class=\"wp-block-paragraph\">Therefore, the selection process should be based on the <strong>maximum calculated PV open-circuit voltage<\/strong>, rather than simply copying the nominal inverter or system voltage.<\/p>\n\n\n\n<p class=\"wp-block-paragraph\">A simplified workflow is:<\/p>\n\n\n\n<p class=\"wp-block-paragraph\"><strong>Module Voc<\/strong><\/p>\n\n\n\n<p class=\"wp-block-paragraph\">\u2192 <strong>Number of modules in series<\/strong><\/p>\n\n\n\n<p class=\"wp-block-paragraph\">\u2192 <strong>Low-temperature correction<\/strong><\/p>\n\n\n\n<p class=\"wp-block-paragraph\">\u2192 <strong>Maximum PV open-circuit voltage<\/strong><\/p>\n\n\n\n<p class=\"wp-block-paragraph\">\u2192 <strong>Select suitable Ucpv<\/strong><\/p>\n\n\n\n<p class=\"wp-block-paragraph\">We have already covered this subject separately in our <strong><a href=\"https:\/\/cnkuangya.com\/fr\/blog\/dc-spd-selection-guide\/\">DC SPD Voltage Selection Guide<\/a><\/strong>, including 600V, 1000V and 1500V DC applications.<\/p>\n\n\n\n<p class=\"wp-block-paragraph\">So in this article, the important point is simply:<\/p>\n\n\n\n<blockquote class=\"wp-block-quote is-layout-flow wp-block-quote-is-layout-flow\">\n<p class=\"wp-block-paragraph\"><strong>Ucpv is a continuous-voltage compatibility rating, not a surge-current rating.<\/strong><\/p>\n<\/blockquote>\n\n\n\n<hr class=\"wp-block-separator has-alpha-channel-opacity\"\/>\n\n\n\n<h1 class=\"wp-block-heading\">Ucpv Is Not the Same as Up<\/h1>\n\n\n\n<p class=\"wp-block-paragraph\">This is another common source of confusion.<\/p>\n\n\n\n<p class=\"wp-block-paragraph\">Our example SPD shows:<\/p>\n\n\n\n<blockquote class=\"wp-block-quote is-layout-flow wp-block-quote-is-layout-flow\">\n<p class=\"wp-block-paragraph\"><strong>Ucpv = 1000V DC<\/strong><\/p>\n<\/blockquote>\n\n\n\n<p class=\"wp-block-paragraph\">et<\/p>\n\n\n\n<blockquote class=\"wp-block-quote is-layout-flow wp-block-quote-is-layout-flow\">\n<p class=\"wp-block-paragraph\"><strong>Up = 4.0kV<\/strong><\/p>\n<\/blockquote>\n\n\n\n<p class=\"wp-block-paragraph\">A buyer may reasonably ask:<\/p>\n\n\n\n<blockquote class=\"wp-block-quote is-layout-flow wp-block-quote-is-layout-flow\">\n<p class=\"wp-block-paragraph\">Why does a 1000V SPD also have a 4kV voltage rating?<\/p>\n<\/blockquote>\n\n\n\n<p class=\"wp-block-paragraph\">Because these two values describe different things.<\/p>\n\n\n\n<figure class=\"wp-block-table\"><table class=\"has-fixed-layout\"><thead><tr><th>Param\u00e8tres<\/th><th>Exemple<\/th><th>Ce qu'il d\u00e9crit<\/th><\/tr><\/thead><tbody><tr><td>Ucpv<\/td><td>1000V DC<\/td><td>Continuous PV operating voltage<\/td><\/tr><tr><td>Haut de la page<\/td><td>4,0 kV<\/td><td>Voltage protection level during surge testing<\/td><\/tr><\/tbody><\/table><\/figure>\n\n\n\n<figure class=\"wp-block-image size-large\"><img loading=\"lazy\" decoding=\"async\" width=\"1024\" height=\"683\" src=\"https:\/\/cnkuangya.com\/wp-content\/uploads\/2026\/08\/ucpv-vs-up-dc-spd-1024x683.jpg\" alt=\"Ucpv 1000V DC vs Up 4.0kV on a solar DC SPD\" class=\"wp-image-4387\" srcset=\"https:\/\/cnkuangya.com\/wp-content\/uploads\/2026\/08\/ucpv-vs-up-dc-spd-1024x683.jpg 1024w, https:\/\/cnkuangya.com\/wp-content\/uploads\/2026\/08\/ucpv-vs-up-dc-spd-300x200.jpg 300w, https:\/\/cnkuangya.com\/wp-content\/uploads\/2026\/08\/ucpv-vs-up-dc-spd-768x512.jpg 768w, https:\/\/cnkuangya.com\/wp-content\/uploads\/2026\/08\/ucpv-vs-up-dc-spd-18x12.jpg 18w, https:\/\/cnkuangya.com\/wp-content\/uploads\/2026\/08\/ucpv-vs-up-dc-spd-600x400.jpg 600w, https:\/\/cnkuangya.com\/wp-content\/uploads\/2026\/08\/ucpv-vs-up-dc-spd.jpg 1536w\" sizes=\"auto, (max-width: 1024px) 100vw, 1024px\" \/><figcaption class=\"wp-element-caption\">Ucpv describes continuous PV operating voltage, while Up describes the SPD&#8217;s declared voltage protection level.<\/figcaption><\/figure>\n\n\n\n<p class=\"wp-block-paragraph\">Donc :<\/p>\n\n\n\n<p class=\"wp-block-paragraph\"><strong>Ucpv is about surviving normal system operation.<\/strong><\/p>\n\n\n\n<p class=\"wp-block-paragraph\"><strong>Up is about limiting transient surge voltage.<\/strong><\/p>\n\n\n\n<p class=\"wp-block-paragraph\">They should never be treated as interchangeable voltage ratings.<\/p>\n\n\n\n<hr class=\"wp-block-separator has-alpha-channel-opacity\"\/>\n\n\n\n<h1 class=\"wp-block-heading\">What Does In 20kA Mean?<\/h1>\n\n\n\n<p class=\"wp-block-paragraph\">The label shows:<\/p>\n\n\n\n<blockquote class=\"wp-block-quote is-layout-flow wp-block-quote-is-layout-flow\">\n<p class=\"wp-block-paragraph\"><strong>In : 20kA<\/strong><\/p>\n<\/blockquote>\n\n\n\n<p class=\"wp-block-paragraph\">In means:<\/p>\n\n\n\n<p class=\"wp-block-paragraph\"><strong>Courant de d\u00e9charge nominal<\/strong><\/p>\n\n\n\n<p class=\"wp-block-paragraph\">For a Type 2 \/ Class II SPD, In is associated with an <strong>la forme d'onde de courant 8\/20 \u03bcs<\/strong>.<\/p>\n\n\n\n<p class=\"wp-block-paragraph\">In technical terms, it represents the crest value of the current through the SPD having the specified 8\/20 \u03bcs waveshape under the relevant standardized test conditions.<\/p>\n\n\n\n<p class=\"wp-block-paragraph\">That definition is accurate, but for a buyer it can be simplified:<\/p>\n\n\n\n<blockquote class=\"wp-block-quote is-layout-flow wp-block-quote-is-layout-flow\">\n<p class=\"wp-block-paragraph\"><strong>In is one of the main ratings used to describe the tested surge-discharge performance of a Type 2 SPD.<\/strong><\/p>\n<\/blockquote>\n\n\n\n<p class=\"wp-block-paragraph\">For this product:<\/p>\n\n\n\n<blockquote class=\"wp-block-quote is-layout-flow wp-block-quote-is-layout-flow\">\n<p class=\"wp-block-paragraph\"><strong>In = 20kA<\/strong><\/p>\n<\/blockquote>\n\n\n\n<p class=\"wp-block-paragraph\">The important word here is <strong>nominal<\/strong>.<\/p>\n\n\n\n<p class=\"wp-block-paragraph\">It should not be confused with Imax.<\/p>\n\n\n\n<hr class=\"wp-block-separator has-alpha-channel-opacity\"\/>\n\n\n\n<h1 class=\"wp-block-heading\">What Does Imax 40kA Mean?<\/h1>\n\n\n\n<p class=\"wp-block-paragraph\">The same SPD also shows:<\/p>\n\n\n\n<blockquote class=\"wp-block-quote is-layout-flow wp-block-quote-is-layout-flow\">\n<p class=\"wp-block-paragraph\"><strong>Imax : 40kA<\/strong><\/p>\n<\/blockquote>\n\n\n\n<p class=\"wp-block-paragraph\">Imax means:<\/p>\n\n\n\n<p class=\"wp-block-paragraph\"><strong>Courant de d\u00e9charge maximal<\/strong><\/p>\n\n\n\n<p class=\"wp-block-paragraph\">For a Type 2 SPD, Imax is also normally associated with the <strong>la forme d'onde de courant 8\/20 \u03bcs<\/strong>.<\/p>\n\n\n\n<p class=\"wp-block-paragraph\">It represents the manufacturer&#8217;s declared maximum discharge-current capability under the applicable test conditions.<\/p>\n\n\n\n<p class=\"wp-block-paragraph\">Par cons\u00e9quent :<\/p>\n\n\n\n<blockquote class=\"wp-block-quote is-layout-flow wp-block-quote-is-layout-flow\">\n<p class=\"wp-block-paragraph\"><strong>In 20kA and Imax 40kA are not duplicate specifications.<\/strong><\/p>\n<\/blockquote>\n\n\n\n<p class=\"wp-block-paragraph\">They represent different test-duty levels.<\/p>\n\n\n\n<hr class=\"wp-block-separator has-alpha-channel-opacity\"\/>\n\n\n\n<h1 class=\"wp-block-heading\">In 20kA vs Imax 40kA: What Is the Difference?<\/h1>\n\n\n\n<p class=\"wp-block-paragraph\">This is one of the most important parts of the entire datasheet.<\/p>\n\n\n\n<p class=\"wp-block-paragraph\">Consider the example:<\/p>\n\n\n\n<figure class=\"wp-block-table\"><table class=\"has-fixed-layout\"><thead><tr><th>Param\u00e8tres<\/th><th>Valeur<\/th><\/tr><\/thead><tbody><tr><td>En<\/td><td>20kA<\/td><\/tr><tr><td>Imax<\/td><td>40kA<\/td><\/tr><tr><td>Forme d'onde<\/td><td>8\/20 \u03bcs<\/td><\/tr><\/tbody><\/table><\/figure>\n\n\n\n<figure class=\"wp-block-image size-large\"><img loading=\"lazy\" decoding=\"async\" width=\"1024\" height=\"683\" src=\"https:\/\/cnkuangya.com\/wp-content\/uploads\/2026\/08\/spd-in-vs-imax-explained-1024x683.jpg\" alt=\"SPD In 20kA vs Imax 40kA explained for a Type 2 DC SPD\" class=\"wp-image-4386\" srcset=\"https:\/\/cnkuangya.com\/wp-content\/uploads\/2026\/08\/spd-in-vs-imax-explained-1024x683.jpg 1024w, https:\/\/cnkuangya.com\/wp-content\/uploads\/2026\/08\/spd-in-vs-imax-explained-300x200.jpg 300w, https:\/\/cnkuangya.com\/wp-content\/uploads\/2026\/08\/spd-in-vs-imax-explained-768x512.jpg 768w, https:\/\/cnkuangya.com\/wp-content\/uploads\/2026\/08\/spd-in-vs-imax-explained-18x12.jpg 18w, https:\/\/cnkuangya.com\/wp-content\/uploads\/2026\/08\/spd-in-vs-imax-explained-600x400.jpg 600w, https:\/\/cnkuangya.com\/wp-content\/uploads\/2026\/08\/spd-in-vs-imax-explained.jpg 1536w\" sizes=\"auto, (max-width: 1024px) 100vw, 1024px\" \/><figcaption class=\"wp-element-caption\">In and Imax are both expressed in kA, but they represent different Type 2 SPD discharge-current ratings.<\/figcaption><\/figure>\n\n\n\n<p class=\"wp-block-paragraph\">A simple way to understand them is:<\/p>\n\n\n\n<p class=\"wp-block-paragraph\"><strong>En<\/strong> = nominal discharge-current rating.<\/p>\n\n\n\n<p class=\"wp-block-paragraph\"><strong>Imax<\/strong> = maximum declared discharge-current rating.<\/p>\n\n\n\n<p class=\"wp-block-paragraph\">One common purchasing mistake is to look only at Imax because it is the larger number.<\/p>\n\n\n\n<p class=\"wp-block-paragraph\">Par exemple :<\/p>\n\n\n\n<blockquote class=\"wp-block-quote is-layout-flow wp-block-quote-is-layout-flow\">\n<p class=\"wp-block-paragraph\">SPD A: In 20kA \/ Imax 40kA<br>SPD B: In 10kA \/ Imax 40kA<\/p>\n<\/blockquote>\n\n\n\n<p class=\"wp-block-paragraph\">A buyer may see \u201c40kA\u201d on both products and assume that their surge performance is equivalent.<\/p>\n\n\n\n<p class=\"wp-block-paragraph\">That conclusion is incomplete.<\/p>\n\n\n\n<p class=\"wp-block-paragraph\">The full declared performance needs to be checked.<\/p>\n\n\n\n<p class=\"wp-block-paragraph\">VIOX makes the same useful procurement distinction in its SPD datasheet guide: In and Imax should be read separately, and Imax should not be interpreted as the SPD&#8217;s normal repeated discharge capacity.<\/p>\n\n\n\n<hr class=\"wp-block-separator has-alpha-channel-opacity\"\/>\n\n\n\n<h1 class=\"wp-block-heading\">Does Higher Imax Always Mean a Better SPD?<\/h1>\n\n\n\n<p class=\"wp-block-paragraph\">Non.<\/p>\n\n\n\n<p class=\"wp-block-paragraph\">This is probably the most useful purchasing rule in this article:<\/p>\n\n\n\n<blockquote class=\"wp-block-quote is-layout-flow wp-block-quote-is-layout-flow\">\n<p class=\"wp-block-paragraph\"><strong>The highest kA value does not automatically identify the best SPD.<\/strong><\/p>\n<\/blockquote>\n\n\n\n<p class=\"wp-block-paragraph\">Suppose two products are advertised as:<\/p>\n\n\n\n<h3 class=\"wp-block-heading\">SPD A<\/h3>\n\n\n\n<ul class=\"wp-block-list\">\n<li>Ucpv: 1000V<\/li>\n\n\n\n<li>In : 20kA<\/li>\n\n\n\n<li>Imax : 40kA<\/li>\n\n\n\n<li>Up : 4,0kV<\/li>\n<\/ul>\n\n\n\n<h3 class=\"wp-block-heading\">SPD B<\/h3>\n\n\n\n<ul class=\"wp-block-list\">\n<li>Ucpv: 1000V<\/li>\n\n\n\n<li>In : 20kA<\/li>\n\n\n\n<li>Imax: 60kA<\/li>\n\n\n\n<li>Up: different<\/li>\n\n\n\n<li>short-circuit rating: unknown<\/li>\n<\/ul>\n\n\n\n<p class=\"wp-block-paragraph\">It would be incorrect to select SPD B immediately just because:<\/p>\n\n\n\n<blockquote class=\"wp-block-quote is-layout-flow wp-block-quote-is-layout-flow\">\n<p class=\"wp-block-paragraph\">60kA &gt; 40kA.<\/p>\n<\/blockquote>\n\n\n\n<p class=\"wp-block-paragraph\">Other questions still matter:<\/p>\n\n\n\n<ul class=\"wp-block-list\">\n<li>What is its Type \/ Class?<\/li>\n\n\n\n<li>What is In?<\/li>\n\n\n\n<li>What is Up?<\/li>\n\n\n\n<li>What is Ucpv?<\/li>\n\n\n\n<li>What is Iscpv?<\/li>\n\n\n\n<li>What protection mode is declared?<\/li>\n\n\n\n<li>What backup protection is required?<\/li>\n\n\n\n<li>Is it specifically tested for PV DC use?<\/li>\n\n\n\n<li>Does its documentation match the project requirement?<\/li>\n<\/ul>\n\n\n\n<p class=\"wp-block-paragraph\">A larger number may be useful when the complete design calls for it.<\/p>\n\n\n\n<p class=\"wp-block-paragraph\">But:<\/p>\n\n\n\n<blockquote class=\"wp-block-quote is-layout-flow wp-block-quote-is-layout-flow\">\n<p class=\"wp-block-paragraph\"><strong>More kA is not a substitute for correct coordination.<\/strong><\/p>\n<\/blockquote>\n\n\n\n<hr class=\"wp-block-separator has-alpha-channel-opacity\"\/>\n\n\n\n<h1 class=\"wp-block-heading\">Can a 40kA Type 2 SPD Replace a Type 1 SPD?<\/h1>\n\n\n\n<p class=\"wp-block-paragraph\">Not simply because it says 40kA.<\/p>\n\n\n\n<p class=\"wp-block-paragraph\">This is another very common mistake.<\/p>\n\n\n\n<p class=\"wp-block-paragraph\">A Type 2 product may show:<\/p>\n\n\n\n<blockquote class=\"wp-block-quote is-layout-flow wp-block-quote-is-layout-flow\">\n<p class=\"wp-block-paragraph\"><strong>Imax = 40kA, 8\/20 \u03bcs<\/strong><\/p>\n<\/blockquote>\n\n\n\n<p class=\"wp-block-paragraph\">while a Type 1 product may show:<\/p>\n\n\n\n<blockquote class=\"wp-block-quote is-layout-flow wp-block-quote-is-layout-flow\">\n<p class=\"wp-block-paragraph\"><strong>Iimp = 12.5kA, 10\/350 \u03bcs<\/strong><\/p>\n<\/blockquote>\n\n\n\n<p class=\"wp-block-paragraph\">Looking only at the peak current numbers:<\/p>\n\n\n\n<blockquote class=\"wp-block-quote is-layout-flow wp-block-quote-is-layout-flow\">\n<p class=\"wp-block-paragraph\">40 &gt; 12.5<\/p>\n<\/blockquote>\n\n\n\n<p class=\"wp-block-paragraph\">may make the Type 2 SPD appear stronger.<\/p>\n\n\n\n<p class=\"wp-block-paragraph\">But that comparison is technically incorrect.<\/p>\n\n\n\n<p class=\"wp-block-paragraph\">The two values are based on different test waveforms and different protection duties.<\/p>\n\n\n\n<p class=\"wp-block-paragraph\">Par cons\u00e9quent :<\/p>\n\n\n\n<blockquote class=\"wp-block-quote is-layout-flow wp-block-quote-is-layout-flow\">\n<p class=\"wp-block-paragraph\"><strong>Imax cannot be used as a substitute for a specified Iimp requirement.<\/strong><\/p>\n<\/blockquote>\n\n\n\n<p class=\"wp-block-paragraph\">If the project requires Type 1 lightning-current capability, a large Type 2 Imax value alone does not satisfy that requirement.<\/p>\n\n\n\n<hr class=\"wp-block-separator has-alpha-channel-opacity\"\/>\n\n\n\n<h1 class=\"wp-block-heading\">What Does Up 4.0kV Mean?<\/h1>\n\n\n\n<p class=\"wp-block-paragraph\">L'\u00e9tiquette d'exemple indique :<\/p>\n\n\n\n<blockquote class=\"wp-block-quote is-layout-flow wp-block-quote-is-layout-flow\">\n<p class=\"wp-block-paragraph\"><strong>Up : 4,0kV<\/strong><\/p>\n<\/blockquote>\n\n\n\n<p class=\"wp-block-paragraph\">Up means:<\/p>\n\n\n\n<p class=\"wp-block-paragraph\"><strong>Niveau de protection de la tension<\/strong><\/p>\n\n\n\n<p class=\"wp-block-paragraph\">It describes the SPD&#8217;s declared voltage-limiting performance under specified standardized test conditions.<\/p>\n\n\n\n<p class=\"wp-block-paragraph\">In practical terms, Up helps answer the question:<\/p>\n\n\n\n<blockquote class=\"wp-block-quote is-layout-flow wp-block-quote-is-layout-flow\">\n<p class=\"wp-block-paragraph\"><strong>How effectively does the SPD limit the transient voltage during the relevant test?<\/strong><\/p>\n<\/blockquote>\n\n\n\n<p class=\"wp-block-paragraph\">Generally, a lower Up can provide a lower level of surge voltage at the SPD terminals.<\/p>\n\n\n\n<p class=\"wp-block-paragraph\">However, this needs an important qualification.<\/p>\n\n\n\n<p class=\"wp-block-paragraph\">The printed Up value should <strong>pas<\/strong> be treated as the exact maximum voltage that every connected inverter or device will experience in a real installation.<\/p>\n\n\n\n<p class=\"wp-block-paragraph\">Pourquoi ?<\/p>\n\n\n\n<p class=\"wp-block-paragraph\">Because the actual voltage seen by the protected equipment can also be affected by:<\/p>\n\n\n\n<ul class=\"wp-block-list\">\n<li>SPD connection lead length<\/li>\n\n\n\n<li>conductor routing<\/li>\n\n\n\n<li>inductance<\/li>\n\n\n\n<li>installation arrangement<\/li>\n\n\n\n<li>earthing and bonding<\/li>\n\n\n\n<li>distance between the SPD and equipment<\/li>\n\n\n\n<li>coordination with other SPDs<\/li>\n<\/ul>\n\n\n\n<p class=\"wp-block-paragraph\">VIOX correctly makes the same distinction: the declared Up is established at the SPD under standardized conditions, while installation conductors can increase the voltage presented to the protected equipment.<\/p>\n\n\n\n<hr class=\"wp-block-separator has-alpha-channel-opacity\"\/>\n\n\n\n<h1 class=\"wp-block-heading\">Is Lower Up Always Better?<\/h1>\n\n\n\n<p class=\"wp-block-paragraph\">Not by itself.<\/p>\n\n\n\n<p class=\"wp-block-paragraph\">It is reasonable to prefer effective voltage limitation, but the selection must remain compatible with the complete electrical system.<\/p>\n\n\n\n<p class=\"wp-block-paragraph\">A low Up does not compensate for:<\/p>\n\n\n\n<ul class=\"wp-block-list\">\n<li>insufficient Ucpv<\/li>\n\n\n\n<li>wrong SPD Type<\/li>\n\n\n\n<li>incorrect wiring<\/li>\n\n\n\n<li>poor earth connection<\/li>\n\n\n\n<li>unsuitable short-circuit characteristics<\/li>\n\n\n\n<li>excessively long leads<\/li>\n\n\n\n<li>incorrect coordination<\/li>\n<\/ul>\n\n\n\n<p class=\"wp-block-paragraph\">So instead of saying:<\/p>\n\n\n\n<blockquote class=\"wp-block-quote is-layout-flow wp-block-quote-is-layout-flow\">\n<p class=\"wp-block-paragraph\">\u201cAlways buy the SPD with the lowest Up.\u201d<\/p>\n<\/blockquote>\n\n\n\n<p class=\"wp-block-paragraph\">A more technically correct rule is:<\/p>\n\n\n\n<blockquote class=\"wp-block-quote is-layout-flow wp-block-quote-is-layout-flow\">\n<p class=\"wp-block-paragraph\"><strong>Select an SPD with a suitable Up while also verifying Ucpv, SPD Type, protected equipment withstand level and installation coordination.<\/strong><\/p>\n<\/blockquote>\n\n\n\n<hr class=\"wp-block-separator has-alpha-channel-opacity\"\/>\n\n\n\n<h1 class=\"wp-block-heading\">What Does Iscpv 10kA Mean?<\/h1>\n\n\n\n<p class=\"wp-block-paragraph\">Now we come to one of the most misunderstood PV-specific parameters:<\/p>\n\n\n\n<blockquote class=\"wp-block-quote is-layout-flow wp-block-quote-is-layout-flow\">\n<p class=\"wp-block-paragraph\"><strong>Iscpv : 10kA<\/strong><\/p>\n<\/blockquote>\n\n\n\n<p class=\"wp-block-paragraph\">This is particularly important because it also uses the unit <strong>kA<\/strong>.<\/p>\n\n\n\n<p class=\"wp-block-paragraph\">It is easy to look at:<\/p>\n\n\n\n<blockquote class=\"wp-block-quote is-layout-flow wp-block-quote-is-layout-flow\">\n<p class=\"wp-block-paragraph\">In 20kA<br>Imax 40kA<br>Iscpv 10kA<\/p>\n<\/blockquote>\n\n\n\n<p class=\"wp-block-paragraph\">and assume they are three levels of surge current.<\/p>\n\n\n\n<p class=\"wp-block-paragraph\">Ce n'est pas le cas.<\/p>\n\n\n\n<p class=\"wp-block-paragraph\">Iscpv means:<\/p>\n\n\n\n<p class=\"wp-block-paragraph\"><strong>Short-Circuit Current Rating of the SPD for the PV application.<\/strong><\/p>\n\n\n\n<p class=\"wp-block-paragraph\">IEC terminology defines Iscpv as the maximum prospective short-circuit current from the power system for which the SPD, together with the specified disconnector, is rated.<\/p>\n\n\n\n<p class=\"wp-block-paragraph\">A simpler explanation is:<\/p>\n\n\n\n<blockquote class=\"wp-block-quote is-layout-flow wp-block-quote-is-layout-flow\">\n<p class=\"wp-block-paragraph\"><strong>Iscpv tells you whether the SPD and its specified disconnection arrangement are suitable for the prospective PV short-circuit current at the installation point.<\/strong><\/p>\n<\/blockquote>\n\n\n\n<p class=\"wp-block-paragraph\">Il s'agit d'un <strong>fault-current \/ short-circuit characteristic<\/strong>.<\/p>\n\n\n\n<p class=\"wp-block-paragraph\">It is not a lightning-surge rating.<\/p>\n\n\n\n<hr class=\"wp-block-separator has-alpha-channel-opacity\"\/>\n\n\n\n<h1 class=\"wp-block-heading\">Iscpv 10kA Is Not the Same as Imax 10kA<\/h1>\n\n\n\n<figure class=\"wp-block-image size-large\"><img loading=\"lazy\" decoding=\"async\" width=\"1024\" height=\"683\" src=\"https:\/\/cnkuangya.com\/wp-content\/uploads\/2026\/08\/iscpv-vs-imax-pv-spd-1024x683.jpg\" alt=\"Iscpv 10kA vs Imax 40kA photovoltaic DC SPD comparison\" class=\"wp-image-4388\" srcset=\"https:\/\/cnkuangya.com\/wp-content\/uploads\/2026\/08\/iscpv-vs-imax-pv-spd-1024x683.jpg 1024w, https:\/\/cnkuangya.com\/wp-content\/uploads\/2026\/08\/iscpv-vs-imax-pv-spd-300x200.jpg 300w, https:\/\/cnkuangya.com\/wp-content\/uploads\/2026\/08\/iscpv-vs-imax-pv-spd-768x512.jpg 768w, https:\/\/cnkuangya.com\/wp-content\/uploads\/2026\/08\/iscpv-vs-imax-pv-spd-18x12.jpg 18w, https:\/\/cnkuangya.com\/wp-content\/uploads\/2026\/08\/iscpv-vs-imax-pv-spd-600x400.jpg 600w, https:\/\/cnkuangya.com\/wp-content\/uploads\/2026\/08\/iscpv-vs-imax-pv-spd.jpg 1536w\" sizes=\"auto, (max-width: 1024px) 100vw, 1024px\" \/><figcaption class=\"wp-element-caption\">Iscpv is a PV short-circuit-current rating, while Imax describes surge discharge-current capability.<\/figcaption><\/figure>\n\n\n\n<p class=\"wp-block-paragraph\">This distinction deserves to be stated clearly:<\/p>\n\n\n\n<blockquote class=\"wp-block-quote is-layout-flow wp-block-quote-is-layout-flow\">\n<p class=\"wp-block-paragraph\"><strong>Iscpv \u2260 Imax<\/strong><\/p>\n<\/blockquote>\n\n\n\n<p class=\"wp-block-paragraph\">Even though both can be expressed in kA.<\/p>\n\n\n\n<p class=\"wp-block-paragraph\">Par exemple :<\/p>\n\n\n\n<h3 class=\"wp-block-heading\">Imax<\/h3>\n\n\n\n<p class=\"wp-block-paragraph\">Describes surge discharge-current performance.<\/p>\n\n\n\n<h3 class=\"wp-block-heading\">Iscpv<\/h3>\n\n\n\n<p class=\"wp-block-paragraph\">Describes the SPD&#8217;s PV short-circuit-current rating in conjunction with the specified disconnection arrangement.<\/p>\n\n\n\n<p class=\"wp-block-paragraph\">So on our example product:<\/p>\n\n\n\n<blockquote class=\"wp-block-quote is-layout-flow wp-block-quote-is-layout-flow\">\n<p class=\"wp-block-paragraph\"><strong>Imax = 40kA<\/strong><\/p>\n<\/blockquote>\n\n\n\n<p class=\"wp-block-paragraph\">does not mean:<\/p>\n\n\n\n<blockquote class=\"wp-block-quote is-layout-flow wp-block-quote-is-layout-flow\">\n<p class=\"wp-block-paragraph\">PV short-circuit rating = 40kA.<\/p>\n<\/blockquote>\n\n\n\n<p class=\"wp-block-paragraph\">And:<\/p>\n\n\n\n<blockquote class=\"wp-block-quote is-layout-flow wp-block-quote-is-layout-flow\">\n<p class=\"wp-block-paragraph\"><strong>Iscpv = 10kA<\/strong><\/p>\n<\/blockquote>\n\n\n\n<p class=\"wp-block-paragraph\">does not mean:<\/p>\n\n\n\n<blockquote class=\"wp-block-quote is-layout-flow wp-block-quote-is-layout-flow\">\n<p class=\"wp-block-paragraph\">The SPD can only discharge a 10kA surge.<\/p>\n<\/blockquote>\n\n\n\n<p class=\"wp-block-paragraph\">These numbers belong to different electrical events.<\/p>\n\n\n\n<hr class=\"wp-block-separator has-alpha-channel-opacity\"\/>\n\n\n\n<h1 class=\"wp-block-heading\">Why Is Iscpv Especially Important for PV DC Systems?<\/h1>\n\n\n\n<p class=\"wp-block-paragraph\">PV DC circuits behave differently from ordinary AC circuits.<\/p>\n\n\n\n<p class=\"wp-block-paragraph\">One important difference is that DC current does not naturally pass through zero every half-cycle as AC current does.<\/p>\n\n\n\n<p class=\"wp-block-paragraph\">For protection devices, switching equipment and disconnecting arrangements, this makes DC fault interruption an important design consideration.<\/p>\n\n\n\n<p class=\"wp-block-paragraph\">That is one reason PV-specific SPDs have characteristics and test requirements beyond simply printing:<\/p>\n\n\n\n<blockquote class=\"wp-block-quote is-layout-flow wp-block-quote-is-layout-flow\">\n<p class=\"wp-block-paragraph\">\u201cDC 1000V\u201d<\/p>\n<\/blockquote>\n\n\n\n<p class=\"wp-block-paragraph\">on an AC-style product.<\/p>\n\n\n\n<p class=\"wp-block-paragraph\"><a href=\"https:\/\/webstore.iec.ch\/en\/publication\/26931\" rel=\"noopener\">IEC 61643-31<\/a> is specifically intended for SPDs connected to the DC side of photovoltaic installations and establishes PV-specific requirements, ratings and test methods.<\/p>\n\n\n\n<p class=\"wp-block-paragraph\">Therefore, when buying a PV SPD, do not ask only:<\/p>\n\n\n\n<blockquote class=\"wp-block-quote is-layout-flow wp-block-quote-is-layout-flow\">\n<p class=\"wp-block-paragraph\">\u201cIs this 1000V DC?\u201d<\/p>\n<\/blockquote>\n\n\n\n<p class=\"wp-block-paragraph\">Also ask:<\/p>\n\n\n\n<blockquote class=\"wp-block-quote is-layout-flow wp-block-quote-is-layout-flow\">\n<p class=\"wp-block-paragraph\"><strong>What is the declared Iscpv and required disconnection arrangement?<\/strong><\/p>\n<\/blockquote>\n\n\n\n<hr class=\"wp-block-separator has-alpha-channel-opacity\"\/>\n\n\n\n<h1 class=\"wp-block-heading\">In, Imax, Iimp and Iscpv: Do Not Mix Them Up<\/h1>\n\n\n\n<p class=\"wp-block-paragraph\">The easiest way to remember these parameters is with this table:<\/p>\n\n\n\n<figure class=\"wp-block-table\"><table class=\"has-fixed-layout\"><thead><tr><th>Evaluation<\/th><th>Main Meaning<\/th><th>Typical Context<\/th><\/tr><\/thead><tbody><tr><td>En<\/td><td>Courant de d\u00e9charge nominal<\/td><td>Type 2 \/ Class II surge performance<\/td><\/tr><tr><td>Imax<\/td><td>Courant de d\u00e9charge maximal<\/td><td>Type 2 maximum declared surge-current performance<\/td><\/tr><tr><td>Iimp<\/td><td>Impulse current<\/td><td>Type 1 \/ Class I lightning-current capability<\/td><\/tr><tr><td>Iscpv<\/td><td>PV short-circuit current rating<\/td><td>PV fault-current compatibility<\/td><\/tr><\/tbody><\/table><\/figure>\n\n\n\n<p class=\"wp-block-paragraph\">Notice something important:<\/p>\n\n\n\n<p class=\"wp-block-paragraph\">Three or four specifications can all contain:<\/p>\n\n\n\n<blockquote class=\"wp-block-quote is-layout-flow wp-block-quote-is-layout-flow\">\n<p class=\"wp-block-paragraph\"><strong>kA<\/strong><\/p>\n<\/blockquote>\n\n\n\n<p class=\"wp-block-paragraph\">but this does not mean they can be compared directly.<\/p>\n\n\n\n<p class=\"wp-block-paragraph\">Before comparing any two kA ratings, first ask:<\/p>\n\n\n\n<ol class=\"wp-block-list\">\n<li>What parameter is this?<\/li>\n\n\n\n<li>What waveform is used?<\/li>\n\n\n\n<li>What SPD Type is involved?<\/li>\n\n\n\n<li>Is this a surge test or a short-circuit rating?<\/li>\n<\/ol>\n\n\n\n<p class=\"wp-block-paragraph\">This prevents a large number of purchasing errors.<\/p>\n\n\n\n<hr class=\"wp-block-separator has-alpha-channel-opacity\"\/>\n\n\n\n<h1 class=\"wp-block-heading\">What Does \u201c-40\u00b0C to +85\u00b0C\u201d Mean?<\/h1>\n\n\n\n<p class=\"wp-block-paragraph\">The label also declares:<\/p>\n\n\n\n<blockquote class=\"wp-block-quote is-layout-flow wp-block-quote-is-layout-flow\">\n<p class=\"wp-block-paragraph\"><strong>-40\u00b0C \u00e0 +85\u00b0C<\/strong><\/p>\n<\/blockquote>\n\n\n\n<p class=\"wp-block-paragraph\">This is the manufacturer&#8217;s declared temperature range for the product.<\/p>\n\n\n\n<p class=\"wp-block-paragraph\">Environmental ratings should not be ignored simply because electrical parameters look correct.<\/p>\n\n\n\n<p class=\"wp-block-paragraph\">PV equipment may be installed in:<\/p>\n\n\n\n<ul class=\"wp-block-list\">\n<li>rooftop combiner boxes<\/li>\n\n\n\n<li>inverter cabinets<\/li>\n\n\n\n<li>outdoor electrical enclosures<\/li>\n\n\n\n<li>industrial PV rooms<\/li>\n\n\n\n<li>high-temperature regions<\/li>\n\n\n\n<li>cold-weather installations<\/li>\n<\/ul>\n\n\n\n<p class=\"wp-block-paragraph\">The internal temperature of an enclosure can be very different from the normal outdoor air temperature.<\/p>\n\n\n\n<p class=\"wp-block-paragraph\">Therefore, project engineers should confirm that the SPD&#8217;s declared environmental conditions are suitable for the actual enclosure and installation environment.<\/p>\n\n\n\n<hr class=\"wp-block-separator has-alpha-channel-opacity\"\/>\n\n\n\n<h1 class=\"wp-block-heading\">What Does 5%\u201395% Mean?<\/h1>\n\n\n\n<p class=\"wp-block-paragraph\">Where the datasheet declares:<\/p>\n\n\n\n<blockquote class=\"wp-block-quote is-layout-flow wp-block-quote-is-layout-flow\">\n<p class=\"wp-block-paragraph\"><strong>5%\u201395%<\/strong><\/p>\n<\/blockquote>\n\n\n\n<p class=\"wp-block-paragraph\">this normally represents the manufacturer&#8217;s declared relative humidity operating range.<\/p>\n\n\n\n<p class=\"wp-block-paragraph\">However, humidity specifications should always be read together with conditions such as:<\/p>\n\n\n\n<ul class=\"wp-block-list\">\n<li>condensation requirements<\/li>\n\n\n\n<li>enclosure protection<\/li>\n\n\n\n<li>lieu d'installation<\/li>\n\n\n\n<li>temp\u00e9rature<\/li>\n\n\n\n<li>pollution conditions<\/li>\n<\/ul>\n\n\n\n<p class=\"wp-block-paragraph\">The percentage alone does not mean that an exposed SPD can be installed directly in rain or other outdoor environments.<\/p>\n\n\n\n<hr class=\"wp-block-separator has-alpha-channel-opacity\"\/>\n\n\n\n<h1 class=\"wp-block-heading\">What Does Indoor Mean?<\/h1>\n\n\n\n<p class=\"wp-block-paragraph\">The label states:<\/p>\n\n\n\n<blockquote class=\"wp-block-quote is-layout-flow wp-block-quote-is-layout-flow\">\n<p class=\"wp-block-paragraph\"><strong>Int\u00e9rieur<\/strong><\/p>\n<\/blockquote>\n\n\n\n<p class=\"wp-block-paragraph\">This does not necessarily mean that the SPD can never form part of an outdoor PV installation.<\/p>\n\n\n\n<p class=\"wp-block-paragraph\">It means the SPD itself is intended for a protected environment according to its declared construction and installation conditions.<\/p>\n\n\n\n<p class=\"wp-block-paragraph\">For example, an indoor-rated SPD may be installed inside:<\/p>\n\n\n\n<ul class=\"wp-block-list\">\n<li>a suitable outdoor PV combiner box<\/li>\n\n\n\n<li>an IP-rated enclosure<\/li>\n\n\n\n<li>an inverter cabinet<\/li>\n\n\n\n<li>a protected electrical cabinet<\/li>\n<\/ul>\n\n\n\n<p class=\"wp-block-paragraph\">The important distinction is:<\/p>\n\n\n\n<blockquote class=\"wp-block-quote is-layout-flow wp-block-quote-is-layout-flow\">\n<p class=\"wp-block-paragraph\"><strong>The SPD can be inside outdoor equipment without the SPD itself being directly exposed to outdoor conditions.<\/strong><\/p>\n<\/blockquote>\n\n\n\n<hr class=\"wp-block-separator has-alpha-channel-opacity\"\/>\n\n\n\n<h1 class=\"wp-block-heading\">What Does IP20 Mean?<\/h1>\n\n\n\n<p class=\"wp-block-paragraph\">IP20 is the enclosure protection rating shown for the SPD itself.<\/p>\n\n\n\n<p class=\"wp-block-paragraph\">It should not be interpreted as a weatherproof rating.<\/p>\n\n\n\n<p class=\"wp-block-paragraph\">A DIN-rail SPD with IP20 is normally installed inside another suitable enclosure or cabinet.<\/p>\n\n\n\n<p class=\"wp-block-paragraph\">For an outdoor PV installation, the final environmental protection depends on the <strong>complete enclosure<\/strong>, not only the bare SPD module.<\/p>\n\n\n\n<p class=\"wp-block-paragraph\">Donc :<\/p>\n\n\n\n<blockquote class=\"wp-block-quote is-layout-flow wp-block-quote-is-layout-flow\">\n<p class=\"wp-block-paragraph\"><strong>IP20 SPD inside a suitable outdoor enclosure<\/strong><\/p>\n<\/blockquote>\n\n\n\n<p class=\"wp-block-paragraph\">can be a normal arrangement.<\/p>\n\n\n\n<p class=\"wp-block-paragraph\">But:<\/p>\n\n\n\n<blockquote class=\"wp-block-quote is-layout-flow wp-block-quote-is-layout-flow\">\n<p class=\"wp-block-paragraph\"><strong>IP20 SPD directly exposed to rain, dust and outdoor weather<\/strong><\/p>\n<\/blockquote>\n\n\n\n<p class=\"wp-block-paragraph\">should not be assumed to be acceptable.<\/p>\n\n\n\n<figure class=\"wp-block-image size-large\"><img loading=\"lazy\" decoding=\"async\" width=\"1024\" height=\"683\" src=\"https:\/\/cnkuangya.com\/wp-content\/uploads\/2026\/08\/ip20-dc-spd-outdoor-enclosure-1024x683.jpg\" alt=\"IP20 DC SPD installed inside an outdoor photovoltaic enclosure\" class=\"wp-image-4389\" srcset=\"https:\/\/cnkuangya.com\/wp-content\/uploads\/2026\/08\/ip20-dc-spd-outdoor-enclosure-1024x683.jpg 1024w, https:\/\/cnkuangya.com\/wp-content\/uploads\/2026\/08\/ip20-dc-spd-outdoor-enclosure-300x200.jpg 300w, https:\/\/cnkuangya.com\/wp-content\/uploads\/2026\/08\/ip20-dc-spd-outdoor-enclosure-768x512.jpg 768w, https:\/\/cnkuangya.com\/wp-content\/uploads\/2026\/08\/ip20-dc-spd-outdoor-enclosure-18x12.jpg 18w, https:\/\/cnkuangya.com\/wp-content\/uploads\/2026\/08\/ip20-dc-spd-outdoor-enclosure-600x400.jpg 600w, https:\/\/cnkuangya.com\/wp-content\/uploads\/2026\/08\/ip20-dc-spd-outdoor-enclosure.jpg 1536w\" sizes=\"auto, (max-width: 1024px) 100vw, 1024px\" \/><figcaption class=\"wp-element-caption\">An IP20 SPD can be used inside a suitable protected enclosure but should not be directly exposed to outdoor weather.<\/figcaption><\/figure>\n\n\n\n<hr class=\"wp-block-separator has-alpha-channel-opacity\"\/>\n\n\n\n<h1 class=\"wp-block-heading\">How Should You Read This 1000V DC SPD Label as a Whole?<\/h1>\n\n\n\n<p class=\"wp-block-paragraph\">Now we can return to the original example.<\/p>\n\n\n\n<blockquote class=\"wp-block-quote is-layout-flow wp-block-quote-is-layout-flow\">\n<p class=\"wp-block-paragraph\"><strong>Ucpv : 1000V DC<\/strong><br><strong>Classe II<\/strong><br><strong>In : 20kA<\/strong><br><strong>Imax : 40kA<\/strong><br><strong>Up : 4,0kV<\/strong><br><strong>Iscpv : 10kA<\/strong><\/p>\n<\/blockquote>\n\n\n\n<p class=\"wp-block-paragraph\">Instead of reading each number independently, read it as one technical description.<\/p>\n\n\n\n<h3 class=\"wp-block-heading\">Ucpv 1000V DC<\/h3>\n\n\n\n<p class=\"wp-block-paragraph\">This tells us the declared maximum continuous PV operating voltage of the SPD.<\/p>\n\n\n\n<h3 class=\"wp-block-heading\">Classe II<\/h3>\n\n\n\n<p class=\"wp-block-paragraph\">This indicates Class II testing \/ Type 2 application direction.<\/p>\n\n\n\n<h3 class=\"wp-block-heading\">In 20kA<\/h3>\n\n\n\n<p class=\"wp-block-paragraph\">This is the nominal discharge-current rating associated with the relevant Type 2 surge test.<\/p>\n\n\n\n<h3 class=\"wp-block-heading\">Imax 40kA<\/h3>\n\n\n\n<p class=\"wp-block-paragraph\">This is the declared maximum discharge-current rating.<\/p>\n\n\n\n<h3 class=\"wp-block-heading\">Up 4.0kV<\/h3>\n\n\n\n<p class=\"wp-block-paragraph\">This is the declared voltage protection level.<\/p>\n\n\n\n<h3 class=\"wp-block-heading\">Iscpv 10kA<\/h3>\n\n\n\n<p class=\"wp-block-paragraph\">This is the PV short-circuit-current rating and must be understood together with the applicable disconnector\/protection arrangement.<\/p>\n\n\n\n<p class=\"wp-block-paragraph\">Now the label makes much more sense.<\/p>\n\n\n\n<p class=\"wp-block-paragraph\">It is not saying:<\/p>\n\n\n\n<blockquote class=\"wp-block-quote is-layout-flow wp-block-quote-is-layout-flow\">\n<p class=\"wp-block-paragraph\">\u201c1000V, 20kA, 40kA, 10kA \u2014 bigger numbers are better.\u201d<\/p>\n<\/blockquote>\n\n\n\n<p class=\"wp-block-paragraph\">It is describing <strong>different electrical functions and limits<\/strong> of the same SPD.<\/p>\n\n\n\n<hr class=\"wp-block-separator has-alpha-channel-opacity\"\/>\n\n\n\n<h1 class=\"wp-block-heading\">6 Common Mistakes When Reading a DC SPD Datasheet<\/h1>\n\n\n\n<h2 class=\"wp-block-heading\">1. Treating Class II as a Quality Grade<\/h2>\n\n\n\n<p class=\"wp-block-paragraph\">Incorrect:<\/p>\n\n\n\n<blockquote class=\"wp-block-quote is-layout-flow wp-block-quote-is-layout-flow\">\n<p class=\"wp-block-paragraph\">Class I is premium and Class II is lower quality.<\/p>\n<\/blockquote>\n\n\n\n<p class=\"wp-block-paragraph\">Correct:<\/p>\n\n\n\n<blockquote class=\"wp-block-quote is-layout-flow wp-block-quote-is-layout-flow\">\n<p class=\"wp-block-paragraph\">Class I and Class II represent different test\/protection classifications.<\/p>\n<\/blockquote>\n\n\n\n<hr class=\"wp-block-separator has-alpha-channel-opacity\"\/>\n\n\n\n<h2 class=\"wp-block-heading\">2. Selecting an SPD Only by Imax<\/h2>\n\n\n\n<p class=\"wp-block-paragraph\">Incorrect:<\/p>\n\n\n\n<blockquote class=\"wp-block-quote is-layout-flow wp-block-quote-is-layout-flow\">\n<p class=\"wp-block-paragraph\">This one says 60kA, so it is automatically better than the 40kA model.<\/p>\n<\/blockquote>\n\n\n\n<p class=\"wp-block-paragraph\">Correct:<\/p>\n\n\n\n<p class=\"wp-block-paragraph\">Check:<\/p>\n\n\n\n<ul class=\"wp-block-list\">\n<li>Type<\/li>\n\n\n\n<li>Ucpv<\/li>\n\n\n\n<li>En<\/li>\n\n\n\n<li>Imax<\/li>\n\n\n\n<li>Haut de la page<\/li>\n\n\n\n<li>Iscpv<\/li>\n\n\n\n<li>standard<\/li>\n\n\n\n<li>wiring and protection requirements<\/li>\n<\/ul>\n\n\n\n<p class=\"wp-block-paragraph\">before making the comparison.<\/p>\n\n\n\n<hr class=\"wp-block-separator has-alpha-channel-opacity\"\/>\n\n\n\n<h2 class=\"wp-block-heading\">3. Comparing Iimp Directly with Imax<\/h2>\n\n\n\n<p class=\"wp-block-paragraph\">Incorrect:<\/p>\n\n\n\n<blockquote class=\"wp-block-quote is-layout-flow wp-block-quote-is-layout-flow\">\n<p class=\"wp-block-paragraph\">Imax 40kA is higher than Iimp 12.5kA, so Type 2 is stronger.<\/p>\n<\/blockquote>\n\n\n\n<p class=\"wp-block-paragraph\">Correct:<\/p>\n\n\n\n<p class=\"wp-block-paragraph\">Iimp and Imax refer to different test waveforms and different surge duties.<\/p>\n\n\n\n<hr class=\"wp-block-separator has-alpha-channel-opacity\"\/>\n\n\n\n<h2 class=\"wp-block-heading\">4. Confusing Ucpv with Up<\/h2>\n\n\n\n<p class=\"wp-block-paragraph\">Incorrect:<\/p>\n\n\n\n<blockquote class=\"wp-block-quote is-layout-flow wp-block-quote-is-layout-flow\">\n<p class=\"wp-block-paragraph\">The SPD is rated 1000V but Up is 4kV, so the specifications conflict.<\/p>\n<\/blockquote>\n\n\n\n<p class=\"wp-block-paragraph\">Correct:<\/p>\n\n\n\n<p class=\"wp-block-paragraph\">Ucpv and Up describe different voltage characteristics.<\/p>\n\n\n\n<hr class=\"wp-block-separator has-alpha-channel-opacity\"\/>\n\n\n\n<h2 class=\"wp-block-heading\">5. Treating Iscpv as a Surge Rating<\/h2>\n\n\n\n<p class=\"wp-block-paragraph\">Incorrect:<\/p>\n\n\n\n<blockquote class=\"wp-block-quote is-layout-flow wp-block-quote-is-layout-flow\">\n<p class=\"wp-block-paragraph\">Iscpv 10kA means the SPD can discharge 10kA of lightning current.<\/p>\n<\/blockquote>\n\n\n\n<p class=\"wp-block-paragraph\">Correct:<\/p>\n\n\n\n<p class=\"wp-block-paragraph\">Iscpv is a PV short-circuit-current rating.<\/p>\n\n\n\n<hr class=\"wp-block-separator has-alpha-channel-opacity\"\/>\n\n\n\n<h2 class=\"wp-block-heading\">6. Ignoring Installation Conditions<\/h2>\n\n\n\n<p class=\"wp-block-paragraph\">Even a correctly selected SPD can provide poor protection if installation is poor.<\/p>\n\n\n\n<p class=\"wp-block-paragraph\">Important details include:<\/p>\n\n\n\n<ul class=\"wp-block-list\">\n<li>longueur du fil<\/li>\n\n\n\n<li>conductor routing<\/li>\n\n\n\n<li>Raccordement PE<\/li>\n\n\n\n<li>enclosure<\/li>\n\n\n\n<li>coordination<\/li>\n\n\n\n<li>backup protection<\/li>\n\n\n\n<li>distance from protected equipment<\/li>\n<\/ul>\n\n\n\n<p class=\"wp-block-paragraph\">A datasheet tells you what the device is capable of under defined conditions.<\/p>\n\n\n\n<p class=\"wp-block-paragraph\">Installation determines how effectively that capability is used in the real system.<\/p>\n\n\n\n<p class=\"wp-block-paragraph\">The SPD should also be considered together with other <strong><a href=\"https:\/\/cnkuangya.com\/fr\/blog\/solar-pv-electrical-protection\/\">solar PV electrical protection<\/a><\/strong> devices, including DC fuses, isolators, circuit breakers and the overall protection arrangement.<\/p>\n\n\n\n<hr class=\"wp-block-separator has-alpha-channel-opacity\"\/>\n\n\n\n<h1 class=\"wp-block-heading\">How to Check a DC SPD Before Buying<\/h1>\n\n\n\n<figure class=\"wp-block-image size-large\"><img loading=\"lazy\" decoding=\"async\" width=\"1024\" height=\"683\" src=\"https:\/\/cnkuangya.com\/wp-content\/uploads\/2026\/08\/dc-spd-selection-checklist-1024x683.jpg\" alt=\"DC SPD specifications selection checklist for solar PV systems\" class=\"wp-image-4390\" srcset=\"https:\/\/cnkuangya.com\/wp-content\/uploads\/2026\/08\/dc-spd-selection-checklist-1024x683.jpg 1024w, https:\/\/cnkuangya.com\/wp-content\/uploads\/2026\/08\/dc-spd-selection-checklist-300x200.jpg 300w, https:\/\/cnkuangya.com\/wp-content\/uploads\/2026\/08\/dc-spd-selection-checklist-768x512.jpg 768w, https:\/\/cnkuangya.com\/wp-content\/uploads\/2026\/08\/dc-spd-selection-checklist-18x12.jpg 18w, https:\/\/cnkuangya.com\/wp-content\/uploads\/2026\/08\/dc-spd-selection-checklist-600x400.jpg 600w, https:\/\/cnkuangya.com\/wp-content\/uploads\/2026\/08\/dc-spd-selection-checklist.jpg 1536w\" sizes=\"auto, (max-width: 1024px) 100vw, 1024px\" \/><figcaption class=\"wp-element-caption\">A practical sequence for checking DC SPD specifications before purchasing or approving a product.<\/figcaption><\/figure>\n\n\n\n<p class=\"wp-block-paragraph\">For buyers, distributors and EPC procurement teams, the following sequence is more useful than simply asking for:<\/p>\n\n\n\n<blockquote class=\"wp-block-quote is-layout-flow wp-block-quote-is-layout-flow\">\n<p class=\"wp-block-paragraph\">\u201c1000V 40kA SPD price.\u201d<\/p>\n<\/blockquote>\n\n\n\n<h2 class=\"wp-block-heading\">Step 1 \u2014 Confirm the Application<\/h2>\n\n\n\n<p class=\"wp-block-paragraph\">Is the product specifically intended for:<\/p>\n\n\n\n<blockquote class=\"wp-block-quote is-layout-flow wp-block-quote-is-layout-flow\">\n<p class=\"wp-block-paragraph\"><strong>PV DC surge protection?<\/strong><\/p>\n<\/blockquote>\n\n\n\n<p class=\"wp-block-paragraph\">Do not assume an AC SPD with a similar voltage or current marking is interchangeable.<\/p>\n\n\n\n<hr class=\"wp-block-separator has-alpha-channel-opacity\"\/>\n\n\n\n<h2 class=\"wp-block-heading\">Step 2 \u2014 Check Maximum PV Voltage<\/h2>\n\n\n\n<p class=\"wp-block-paragraph\">Determine the maximum possible PV open-circuit voltage.<\/p>\n\n\n\n<p class=\"wp-block-paragraph\">Then confirm that the selected Ucpv is suitable.<\/p>\n\n\n\n<p class=\"wp-block-paragraph\">For the full calculation method, refer to the DC SPD Voltage Selection Guide mentioned earlier.<\/p>\n\n\n\n<h2 class=\"wp-block-heading\">Step 3 \u2014 Confirm Type \/ Class<\/h2>\n\n\n\n<p class=\"wp-block-paragraph\">Determine whether the installation requires:<\/p>\n\n\n\n<ul class=\"wp-block-list\">\n<li>Type 2<\/li>\n\n\n\n<li>Type 1<\/li>\n\n\n\n<li>Type 1+2<\/li>\n<\/ul>\n\n\n\n<p class=\"wp-block-paragraph\">Do not make this decision simply from product price or kA rating.<\/p>\n\n\n\n<p class=\"wp-block-paragraph\">Our detailed <strong>Type 1 vs Type 2 vs Type 1+2 DC SPD<\/strong> guide explains this separately.<\/p>\n\n\n\n<hr class=\"wp-block-separator has-alpha-channel-opacity\"\/>\n\n\n\n<h2 class=\"wp-block-heading\">Step 4 \u2014 Check In and Imax<\/h2>\n\n\n\n<p class=\"wp-block-paragraph\">For a Type 2 \/ Class II SPD, confirm both values.<\/p>\n\n\n\n<p class=\"wp-block-paragraph\">Do not check only Imax.<\/p>\n\n\n\n<hr class=\"wp-block-separator has-alpha-channel-opacity\"\/>\n\n\n\n<h2 class=\"wp-block-heading\">Step 5 \u2014 Check Up<\/h2>\n\n\n\n<p class=\"wp-block-paragraph\">Verify the declared voltage protection level and whether it is appropriate for the protected equipment and protection concept.<\/p>\n\n\n\n<hr class=\"wp-block-separator has-alpha-channel-opacity\"\/>\n\n\n\n<h2 class=\"wp-block-heading\">Step 6 \u2014 Check Iscpv<\/h2>\n\n\n\n<p class=\"wp-block-paragraph\">Confirm that the SPD and specified disconnection\/protection arrangement are compatible with the prospective short-circuit current of the PV system.<\/p>\n\n\n\n<hr class=\"wp-block-separator has-alpha-channel-opacity\"\/>\n\n\n\n<h2 class=\"wp-block-heading\">Step 7 \u2014 Check Installation Configuration<\/h2>\n\n\n\n<p class=\"wp-block-paragraph\">Confirm:<\/p>\n\n\n\n<ul class=\"wp-block-list\">\n<li>pole configuration<\/li>\n\n\n\n<li>DC+\/DC\u2212 arrangement<\/li>\n\n\n\n<li>Raccordement PE<\/li>\n\n\n\n<li>protection mode<\/li>\n\n\n\n<li>backup protection<\/li>\n\n\n\n<li>sch\u00e9ma de c\u00e2blage<\/li>\n<\/ul>\n\n\n\n<hr class=\"wp-block-separator has-alpha-channel-opacity\"\/>\n\n\n\n<h2 class=\"wp-block-heading\">Step 8 \u2014 Check Environmental Conditions<\/h2>\n\n\n\n<p class=\"wp-block-paragraph\">V\u00e9rifier :<\/p>\n\n\n\n<ul class=\"wp-block-list\">\n<li>temperature range<\/li>\n\n\n\n<li>humidity<\/li>\n\n\n\n<li>indoor\/outdoor condition<\/li>\n\n\n\n<li>enclosure IP rating<\/li>\n\n\n\n<li>installation altitude where relevant<\/li>\n<\/ul>\n\n\n\n<hr class=\"wp-block-separator has-alpha-channel-opacity\"\/>\n\n\n\n<h2 class=\"wp-block-heading\">Step 9 \u2014 Verify the Standard and Documentation<\/h2>\n\n\n\n<p class=\"wp-block-paragraph\">For PV DC SPDs, IEC 61643-31 is an important product standard to check.<\/p>\n\n\n\n<p class=\"wp-block-paragraph\">IEC 61643-31:2018 covers SPDs intended for the DC side of photovoltaic installations up to 1500V DC, while IEC 61643-32:2017 addresses their selection, installation and coordination.<\/p>\n\n\n\n<p class=\"wp-block-paragraph\">Depending on the project and market, buyers may also need:<\/p>\n\n\n\n<ul class=\"wp-block-list\">\n<li>certificat<\/li>\n\n\n\n<li>test report<\/li>\n\n\n\n<li>datasheet<\/li>\n\n\n\n<li>sch\u00e9ma de c\u00e2blage<\/li>\n\n\n\n<li>dimensional drawing<\/li>\n\n\n\n<li>declaration of conformity<\/li>\n\n\n\n<li>project-specific approvals<\/li>\n<\/ul>\n\n\n\n<p class=\"wp-block-paragraph\">Do not assume that a logo printed on a product is sufficient evidence.<\/p>\n\n\n\n<p class=\"wp-block-paragraph\">Match the documentation to the exact model being purchased.<\/p>\n\n\n\n<hr class=\"wp-block-separator has-alpha-channel-opacity\"\/>\n\n\n\n<h1 class=\"wp-block-heading\">DC SPD Specification Checklist<\/h1>\n\n\n\n<p class=\"wp-block-paragraph\">Before approving a PV SPD, use the following checklist.<\/p>\n\n\n\n<figure class=\"wp-block-table\"><table class=\"has-fixed-layout\"><thead><tr><th>V\u00e9rifier<\/th><th>Question<\/th><\/tr><\/thead><tbody><tr><td>Application<\/td><td>Is it specifically suitable for PV DC?<\/td><\/tr><tr><td>Ucpv<\/td><td>Is it suitable for maximum PV open-circuit voltage?<\/td><\/tr><tr><td>Type de DOCUP<\/td><td>Does Type 1 \/ Type 2 \/ Type 1+2 match the installation design?<\/td><\/tr><tr><td>Classe d'essai<\/td><td>Is the declared classification clear?<\/td><\/tr><tr><td>En<\/td><td>Is the nominal discharge-current rating specified?<\/td><\/tr><tr><td>Imax<\/td><td>Is the maximum discharge-current rating specified?<\/td><\/tr><tr><td>Iimp<\/td><td>If Type 1 is required, is Iimp declared?<\/td><\/tr><tr><td>Haut de la page<\/td><td>Is the protection level suitable?<\/td><\/tr><tr><td>Iscpv<\/td><td>Is the PV short-circuit rating adequate?<\/td><\/tr><tr><td>C\u00e2blage<\/td><td>Is the correct DC connection diagram available?<\/td><\/tr><tr><td>Protection de l'environnement<\/td><td>Is required backup protection identified?<\/td><\/tr><tr><td>Environnement<\/td><td>Are temperature, IP and enclosure conditions suitable?<\/td><\/tr><tr><td>Standard<\/td><td>Is the applicable PV SPD standard stated?<\/td><\/tr><tr><td>Documentation<\/td><td>Do certificates\/test reports match the exact model?<\/td><\/tr><\/tbody><\/table><\/figure>\n\n\n\n<hr class=\"wp-block-separator has-alpha-channel-opacity\"\/>\n\n\n\n<h1 class=\"wp-block-heading\">Example: How a Buyer Should Request a 1000V DC SPD<\/h1>\n\n\n\n<p class=\"wp-block-paragraph\">A weak RFQ might say:<\/p>\n\n\n\n<blockquote class=\"wp-block-quote is-layout-flow wp-block-quote-is-layout-flow\">\n<p class=\"wp-block-paragraph\">Please quote 1000V 40kA solar SPD.<\/p>\n<\/blockquote>\n\n\n\n<p class=\"wp-block-paragraph\">This leaves many important questions unanswered.<\/p>\n\n\n\n<p class=\"wp-block-paragraph\">A better RFQ is:<\/p>\n\n\n\n<blockquote class=\"wp-block-quote is-layout-flow wp-block-quote-is-layout-flow\">\n<p class=\"wp-block-paragraph\">Please quote a Type 2 \/ Class II PV DC SPD for a 1000V DC application. Please confirm Ucpv, In, Imax, Up, Iscpv, pole configuration, required backup protection, IEC 61643-31 documentation and wiring diagram.<\/p>\n<\/blockquote>\n\n\n\n<p class=\"wp-block-paragraph\">If known, also include:<\/p>\n\n\n\n<ul class=\"wp-block-list\">\n<li>actual maximum string Voc<\/li>\n\n\n\n<li>quantit\u00e9<\/li>\n\n\n\n<li>installation point<\/li>\n\n\n\n<li>system configuration<\/li>\n\n\n\n<li>minimum temperature<\/li>\n\n\n\n<li>enclosure\/application<\/li>\n\n\n\n<li>OEM requirements<\/li>\n<\/ul>\n\n\n\n<p class=\"wp-block-paragraph\">This allows the manufacturer to evaluate the complete requirement instead of matching only the words:<\/p>\n\n\n\n<blockquote class=\"wp-block-quote is-layout-flow wp-block-quote-is-layout-flow\">\n<p class=\"wp-block-paragraph\">\u201c1000V\u201d and \u201c40kA.\u201d<\/p>\n<\/blockquote>\n\n\n\n<hr class=\"wp-block-separator has-alpha-channel-opacity\"\/>\n\n\n\n<h1 class=\"wp-block-heading\">Questions fr\u00e9quemment pos\u00e9es<\/h1>\n\n\n\n<h2 class=\"wp-block-heading\">Is Class II the Same as Type 2 SPD?<\/h2>\n\n\n\n<p class=\"wp-block-paragraph\">They are closely related but technically describe classification\/testing from slightly different perspectives.<\/p>\n\n\n\n<p class=\"wp-block-paragraph\">For practical PV product selection, a Type 2 SPD is associated with <strong>un test de classe II<\/strong>, which is why labels and datasheets may show Type 2, T2 or Class II terminology.<\/p>\n\n\n\n<hr class=\"wp-block-separator has-alpha-channel-opacity\"\/>\n\n\n\n<h2 class=\"wp-block-heading\">Is Class II SPD Lower Quality Than Class I?<\/h2>\n\n\n\n<p class=\"wp-block-paragraph\">Non.<\/p>\n\n\n\n<p class=\"wp-block-paragraph\">Class I and Class II are not quality levels.<\/p>\n\n\n\n<p class=\"wp-block-paragraph\">They are intended for different surge-protection duties and test conditions.<\/p>\n\n\n\n<hr class=\"wp-block-separator has-alpha-channel-opacity\"\/>\n\n\n\n<h2 class=\"wp-block-heading\">What Is the Difference Between In and Imax?<\/h2>\n\n\n\n<p class=\"wp-block-paragraph\">In is the <strong>nominal discharge current<\/strong>.<\/p>\n\n\n\n<p class=\"wp-block-paragraph\">Imax is the <strong>maximum discharge current<\/strong>.<\/p>\n\n\n\n<p class=\"wp-block-paragraph\">For Type 2 SPDs, both are normally associated with the 8\/20 \u03bcs waveform, but they represent different test-duty levels.<\/p>\n\n\n\n<hr class=\"wp-block-separator has-alpha-channel-opacity\"\/>\n\n\n\n<h2 class=\"wp-block-heading\">Is 40kA Imax Better Than 20kA?<\/h2>\n\n\n\n<p class=\"wp-block-paragraph\">Not enough information is available to answer that from Imax alone.<\/p>\n\n\n\n<p class=\"wp-block-paragraph\">A proper comparison also requires Ucpv, Type, In, Up, Iscpv, standard, protection configuration and installation conditions.<\/p>\n\n\n\n<hr class=\"wp-block-separator has-alpha-channel-opacity\"\/>\n\n\n\n<h2 class=\"wp-block-heading\">Can a 40kA Type 2 SPD Replace a Type 1 SPD?<\/h2>\n\n\n\n<p class=\"wp-block-paragraph\">Not simply because its peak current number is larger.<\/p>\n\n\n\n<p class=\"wp-block-paragraph\">Type 1 is characterized by lightning impulse-current capability such as Iimp and the associated Class I test conditions.<\/p>\n\n\n\n<p class=\"wp-block-paragraph\">Imax and Iimp should not be directly compared.<\/p>\n\n\n\n<hr class=\"wp-block-separator has-alpha-channel-opacity\"\/>\n\n\n\n<h2 class=\"wp-block-heading\">What Is the Difference Between Ucpv and Up?<\/h2>\n\n\n\n<p class=\"wp-block-paragraph\"><strong>Ucpv<\/strong> is the maximum continuous operating voltage for the PV application.<\/p>\n\n\n\n<p class=\"wp-block-paragraph\"><strong>Haut de la page<\/strong> is the declared voltage protection level under specified surge test conditions.<\/p>\n\n\n\n<p class=\"wp-block-paragraph\">They perform completely different functions in the datasheet.<\/p>\n\n\n\n<hr class=\"wp-block-separator has-alpha-channel-opacity\"\/>\n\n\n\n<h2 class=\"wp-block-heading\">What Does Iscpv Mean?<\/h2>\n\n\n\n<p class=\"wp-block-paragraph\">Iscpv is the short-circuit current rating of the PV SPD.<\/p>\n\n\n\n<p class=\"wp-block-paragraph\">More precisely, it describes the maximum prospective short-circuit current for which the SPD, together with its specified disconnector arrangement, is rated.<\/p>\n\n\n\n<hr class=\"wp-block-separator has-alpha-channel-opacity\"\/>\n\n\n\n<h2 class=\"wp-block-heading\">Is Iscpv the Same as Imax?<\/h2>\n\n\n\n<p class=\"wp-block-paragraph\">Non.<\/p>\n\n\n\n<p class=\"wp-block-paragraph\">Imax is a surge discharge-current rating.<\/p>\n\n\n\n<p class=\"wp-block-paragraph\">Iscpv is a short-circuit-current rating.<\/p>\n\n\n\n<p class=\"wp-block-paragraph\">The fact that both use kA does not make them interchangeable.<\/p>\n\n\n\n<hr class=\"wp-block-separator has-alpha-channel-opacity\"\/>\n\n\n\n<h2 class=\"wp-block-heading\">Is a 1000V DC SPD Suitable for Every 1000V Solar System?<\/h2>\n\n\n\n<p class=\"wp-block-paragraph\">Not automatically.<\/p>\n\n\n\n<p class=\"wp-block-paragraph\">Maximum PV open-circuit voltage should be calculated under the project&#8217;s design conditions before selecting Ucpv.<\/p>\n\n\n\n<p class=\"wp-block-paragraph\">For more detail, see our <strong>Guide de s\u00e9lection des parafoudres CC : comment choisir la tension nominale appropri\u00e9e<\/strong>.<\/p>\n\n\n\n<hr class=\"wp-block-separator has-alpha-channel-opacity\"\/>\n\n\n\n<h2 class=\"wp-block-heading\">Can an IP20 SPD Be Used in an Outdoor Solar Installation?<\/h2>\n\n\n\n<p class=\"wp-block-paragraph\">It may be installed <strong>inside a suitable outdoor enclosure<\/strong>, provided the complete installation satisfies the required environmental protection.<\/p>\n\n\n\n<p class=\"wp-block-paragraph\">IP20 on the SPD itself should not be treated as a weatherproof outdoor rating.<\/p>\n\n\n\n<hr class=\"wp-block-separator has-alpha-channel-opacity\"\/>\n\n\n\n<h2 class=\"wp-block-heading\">What Standard Should Be Checked for a PV DC SPD?<\/h2>\n\n\n\n<p class=\"wp-block-paragraph\">IEC 61643-31 covers requirements and test methods for SPDs intended for the DC side of photovoltaic installations up to 1500V DC.<\/p>\n\n\n\n<p class=\"wp-block-paragraph\">IEC 61643-32 provides selection and application principles for PV SPDs.<\/p>\n\n\n\n<hr class=\"wp-block-separator has-alpha-channel-opacity\"\/>\n\n\n\n<h1 class=\"wp-block-heading\">Conclusion<\/h1>\n\n\n\n<p class=\"wp-block-paragraph\">Reading a DC SPD datasheet becomes much easier once each parameter is treated according to its actual purpose.<\/p>\n\n\n\n<p class=\"wp-block-paragraph\">For the example:<\/p>\n\n\n\n<blockquote class=\"wp-block-quote is-layout-flow wp-block-quote-is-layout-flow\">\n<p class=\"wp-block-paragraph\"><strong>Classe II<\/strong><br><strong>Ucpv 1000V DC<\/strong><br><strong>In 20kA<\/strong><br><strong>Imax 40kA<\/strong><br><strong>Up 4.0kV<\/strong><br><strong>Iscpv 10kA<\/strong><\/p>\n<\/blockquote>\n\n\n\n<p class=\"wp-block-paragraph\">the correct interpretation is not simply:<\/p>\n\n\n\n<blockquote class=\"wp-block-quote is-layout-flow wp-block-quote-is-layout-flow\">\n<p class=\"wp-block-paragraph\">\u201cThis is a 1000V, 40kA SPD.\u201d<\/p>\n<\/blockquote>\n\n\n\n<p class=\"wp-block-paragraph\">A more complete interpretation is:<\/p>\n\n\n\n<ul class=\"wp-block-list\">\n<li><strong>Classe II<\/strong> identifies its Class II \/ Type 2 protection direction.<\/li>\n\n\n\n<li><strong>Ucpv 1000V DC<\/strong> describes continuous PV voltage compatibility.<\/li>\n\n\n\n<li><strong>In 20kA<\/strong> describes nominal discharge-current performance.<\/li>\n\n\n\n<li><strong>Imax 40kA<\/strong> describes maximum declared discharge-current performance.<\/li>\n\n\n\n<li><strong>Up 4.0kV<\/strong> describes the declared voltage protection level.<\/li>\n\n\n\n<li><strong>Iscpv 10kA<\/strong> describes the PV short-circuit-current rating.<\/li>\n<\/ul>\n\n\n\n<p class=\"wp-block-paragraph\">Each specification answers a different engineering question.<\/p>\n\n\n\n<p class=\"wp-block-paragraph\">That leads to one simple purchasing principle:<\/p>\n\n\n\n<blockquote class=\"wp-block-quote is-layout-flow wp-block-quote-is-layout-flow\">\n<p class=\"wp-block-paragraph\"><strong>Never select a DC SPD from one voltage number, one kA number or one Type label alone.<\/strong><\/p>\n<\/blockquote>\n\n\n\n<p class=\"wp-block-paragraph\">The correct SPD is the one whose complete set of ratings matches the PV system voltage, surge environment, equipment protection requirements, short-circuit conditions and installation design.<\/p>\n\n\n\n<p class=\"wp-block-paragraph\">For solar PV projects requiring 600V, 1000V or 1500V surge protection, explore <strong><a href=\"https:\/\/cnkuangya.com\/fr\/dc-spd\/\">KUANGYA DC surge protective devices<\/a><\/strong> to compare available Type 2 and Type 1+2 models by voltage rating, discharge-current capability and application. <\/p>","protected":false},"excerpt":{"rendered":"<p>A DC surge protective device may look simple from the outside, but the markings printed on its label contain important information about where the SPD can be used and how it performs. Consider this example from a 1000V DC solar SPD: Ucpv: 1000V DCClass IIIn: 20kAImax: 40kAUp: 4.0kVIscpv: 10kA-40\u00b0C to +85\u00b0CIndoor, IP20 For an experienced [&hellip;]<\/p>\n","protected":false},"author":7,"featured_media":4381,"comment_status":"closed","ping_status":"closed","sticky":false,"template":"","format":"standard","meta":{"footnotes":""},"categories":[35],"tags":[],"class_list":["post-4374","post","type-post","status-publish","format-standard","has-post-thumbnail","hentry","category-blog"],"blocksy_meta":[],"_links":{"self":[{"href":"https:\/\/cnkuangya.com\/fr\/wp-json\/wp\/v2\/posts\/4374","targetHints":{"allow":["GET"]}}],"collection":[{"href":"https:\/\/cnkuangya.com\/fr\/wp-json\/wp\/v2\/posts"}],"about":[{"href":"https:\/\/cnkuangya.com\/fr\/wp-json\/wp\/v2\/types\/post"}],"author":[{"embeddable":true,"href":"https:\/\/cnkuangya.com\/fr\/wp-json\/wp\/v2\/users\/7"}],"replies":[{"embeddable":true,"href":"https:\/\/cnkuangya.com\/fr\/wp-json\/wp\/v2\/comments?post=4374"}],"version-history":[{"count":3,"href":"https:\/\/cnkuangya.com\/fr\/wp-json\/wp\/v2\/posts\/4374\/revisions"}],"predecessor-version":[{"id":4466,"href":"https:\/\/cnkuangya.com\/fr\/wp-json\/wp\/v2\/posts\/4374\/revisions\/4466"}],"wp:featuredmedia":[{"embeddable":true,"href":"https:\/\/cnkuangya.com\/fr\/wp-json\/wp\/v2\/media\/4381"}],"wp:attachment":[{"href":"https:\/\/cnkuangya.com\/fr\/wp-json\/wp\/v2\/media?parent=4374"}],"wp:term":[{"taxonomy":"category","embeddable":true,"href":"https:\/\/cnkuangya.com\/fr\/wp-json\/wp\/v2\/categories?post=4374"},{"taxonomy":"post_tag","embeddable":true,"href":"https:\/\/cnkuangya.com\/fr\/wp-json\/wp\/v2\/tags?post=4374"}],"curies":[{"name":"wp","href":"https:\/\/api.w.org\/{rel}","templated":true}]}}