{"id":2112,"date":"2025-06-17T16:28:06","date_gmt":"2025-06-17T08:28:06","guid":{"rendered":"https:\/\/www.britecelectric.com\/?post_type=blog&#038;p=2112"},"modified":"2025-08-19T16:03:23","modified_gmt":"2025-08-19T08:03:23","slug":"ac-vs-dc-surge-protection-whats-the-difference","status":"publish","type":"blog","link":"https:\/\/www.britecelectric.com\/pt\/blog\/ac-vs-dc-surge-protection-whats-the-difference\/","title":{"rendered":"AC vs. DC Surge Protection: What&#8217;s the Difference?"},"content":{"rendered":"A prote\u00e7\u00e3o contra surtos \u00e9 fundamental para a seguran\u00e7a e o tempo de atividade dos sistemas el\u00e9tricos modernos. Escolhendo o certo <a href=\"https:\/\/www.britecelectric.com\/pt\/products\/\" target=\"_blank\" rel=\"noopener\"><strong data-start=\"1300\" data-end=\"1333\">Dispositivo de prote\u00e7\u00e3o contra surtos (SPD)<\/strong><\/a> come\u00e7a com a compreens\u00e3o de como os sistemas CA e CC se comportam de maneira diferente sob transientes - especialmente extin\u00e7\u00e3o de arco (cruzamento zero CA vs CC sem cruzamento zero) e design de componentes (MOVs bidirecionais vs unidirecionais). Este guia explica a diferen\u00e7a entre AC SPD e DC SPD, mapeia os padr\u00f5es IEC\/UL aplic\u00e1veis \u200b\u200be mostra como selecionar um SPD que atenda \u00e0s suas necessidades de aplica\u00e7\u00e3o e conformidade.\r\n<h2>1. Introdu\u00e7\u00e3o<\/h2>\r\nTransient overvoltages, also known as power surges, are short-duration spikes in voltage that can damage or destroy sensitive electronic equipment. These surges can be caused by lightning strikes, grid switching operations, large load switching, or inductive equipment startups. SPD devices, also called surge suppressors or surge arresters, are engineered to detect and divert these spikes before they reach protected equipment.\r\n\r\nBut not all surges\u2014or SPDs\u2014are created equal. AC (Alternating Current) and DC (Direct Current) systems exhibit very different electrical behaviors and, as such, require distinct surge protection approaches. Per <a href=\"https:\/\/webstore.iec.ch\/en\/publication\/26931\" target=\"_blank\" rel=\"noopener\"><strong><em>CEI 61643-11\/-31<\/em><\/strong><\/a>, um SPD limita a tens\u00e3o de surto e desvia a corrente de surto em nanossegundos, protegendo o equipamento downstream.\r\n<h2>2. O que \u00e9 prote\u00e7\u00e3o contra surtos de CA?<\/h2>\r\n<a href=\"https:\/\/www.britecelectric.com\/pt\/product-category\/ac-power-surge-protection\/\" rel=\"attachment wp-att-2114\"><img class=\"alignnone wp-image-2114\" src=\"https:\/\/www.britecelectric.com\/wp-content\/uploads\/2025\/06\/AC-Power-Surge-Protection-1024x1024.webp\" alt=\"\" width=\"600\" height=\"600\" \/><\/a>\r\n\r\n<a href=\"https:\/\/www.britecelectric.com\/pt\/product-category\/ac-power-surge-protection\/\" target=\"_blank\" rel=\"noopener\"><em><strong data-start=\"218\" data-end=\"241\">Prote\u00e7\u00e3o contra sobretens\u00e3o CA<\/strong><\/em><\/a> foi projetado para sistemas el\u00e9tricos onde a tens\u00e3o alterna a dire\u00e7\u00e3o periodicamente - normalmente em 50 Hz ou 60 Hz. Esses sistemas s\u00e3o amplamente utilizados em resid\u00eancias, edif\u00edcios comerciais, f\u00e1bricas e redes de automa\u00e7\u00e3o industrial. De acordo com <a href=\"https:\/\/webstore.iec.ch\/en\/publication\/65314\" target=\"_blank\" rel=\"noopener\"><strong data-start=\"490\" data-end=\"506\">CEI 61643-11<\/strong><\/a>, os SPDs AC s\u00e3o classificados em Tipo 1, Tipo 2 e Tipo 3, cada um destinado a um ponto de instala\u00e7\u00e3o diferente dentro do sistema de distribui\u00e7\u00e3o.\r\n<h3 data-start=\"652\" data-end=\"688\">Principais caracter\u00edsticas dos SPDs AC<\/h3>\r\n<ul data-start=\"689\" data-end=\"1410\">\r\n \t<li data-start=\"689\" data-end=\"777\">\r\n<p data-start=\"691\" data-end=\"777\">Opere em tens\u00f5es de rede comuns, como 115 V, 230 V, 400 V e at\u00e9 690 V CA.<\/p>\r\n<\/li>\r\n \t<li data-start=\"778\" data-end=\"857\">\r\n<p data-start=\"780\" data-end=\"857\">Opera\u00e7\u00e3o bidirecional para lidar com a comuta\u00e7\u00e3o de polaridade de ondas senoidais CA.<\/p>\r\n<\/li>\r\n \t<li data-start=\"858\" data-end=\"983\">\r\n<p data-start=\"860\" data-end=\"983\">Extin\u00e7\u00e3o do arco atrav\u00e9s de cruzamentos naturais por zero da forma de onda CA, o que torna a desconex\u00e3o mais segura e eficiente.<\/p>\r\n<\/li>\r\n \t<li data-start=\"984\" data-end=\"1220\">\r\n<p data-start=\"986\" data-end=\"1220\">MOVs (varistores de \u00f3xido met\u00e1lico) comumente usados \u200b\u200bpara absorver energia de surto; em SPDs Tipo 1, os MOVs s\u00e3o frequentemente combinados com GDTs (tubos de descarga de g\u00e1s) ou c\u00e2maras de arco para suportar impulsos de raios de alta energia (formas de onda de 10\/350 \u00b5s).<\/p>\r\n<\/li>\r\n \t<li data-start=\"1221\" data-end=\"1410\">\r\n<p data-start=\"1223\" data-end=\"1410\">\u00c9 necess\u00e1ria coordena\u00e7\u00e3o com prote\u00e7\u00e3o a montante (MCB ou fus\u00edvel); A melhor pr\u00e1tica \u00e9 manter o comprimento do cabo do SPD o mais curto poss\u00edvel, idealmente &lt;0,5 m, para minimizar a tens\u00e3o residual.<\/p>\r\n<\/li>\r\n<\/ul>\r\n<blockquote>\r\n<h3 data-start=\"1412\" data-end=\"1447\">Tipos de SPD para aplica\u00e7\u00f5es AC<\/h3>\r\n<ul data-start=\"1448\" data-end=\"1800\">\r\n \t<li data-start=\"1448\" data-end=\"1558\">\r\n<p data-start=\"1450\" data-end=\"1558\"><strong data-start=\"1450\" data-end=\"1464\">Tipo 1 SPD<\/strong> \u2013 Instalado na entrada de servi\u00e7o; suporta correntes diretas de raios (Iimp 10\/350 \u00b5s).<\/p>\r\n<\/li>\r\n \t<li data-start=\"1559\" data-end=\"1689\">\r\n<p data-start=\"1561\" data-end=\"1689\"><strong data-start=\"1561\" data-end=\"1575\">Tipo 2 SPD<\/strong> \u2013 Instalado em quadros de distribui\u00e7\u00e3o; protege contra surtos de comuta\u00e7\u00e3o e raios indiretos (In\/Imax 8\/20 \u00b5s).<\/p>\r\n<\/li>\r\n \t<li data-start=\"1690\" data-end=\"1800\">\r\n<p data-start=\"1692\" data-end=\"1800\"><strong data-start=\"1692\" data-end=\"1706\">Tipo 3 SPD<\/strong> \u2013 Instalado pr\u00f3ximo a equipamentos sens\u00edveis; fornece prote\u00e7\u00e3o fina contra surtos residuais.<\/p>\r\n<\/li>\r\n<\/ul>\r\n<h3 data-start=\"1802\" data-end=\"1828\">Aplica\u00e7\u00f5es t\u00edpicas<\/h3>\r\n<ul data-start=\"1829\" data-end=\"2053\">\r\n \t<li data-start=\"1829\" data-end=\"1870\">\r\n<p data-start=\"1831\" data-end=\"1870\">Botoneiras principais de servi\u00e7o (Tipo 1)<\/p>\r\n<\/li>\r\n \t<li data-start=\"1871\" data-end=\"1912\">\r\n<p data-start=\"1873\" data-end=\"1912\">Quadros de distribui\u00e7\u00e3o de edif\u00edcios (Tipo 2)<\/p>\r\n<\/li>\r\n \t<li data-start=\"1913\" data-end=\"1967\">\r\n<p data-start=\"1915\" data-end=\"1967\">Pain\u00e9is de controle em ambientes industriais (Tipo 2)<\/p>\r\n<\/li>\r\n \t<li data-start=\"1968\" data-end=\"2053\">\r\n<p data-start=\"1970\" data-end=\"2053\">Prote\u00e7\u00e3o no ponto de uso ou no n\u00edvel do soquete para dispositivos sens\u00edveis alimentados por CA (Tipo 3)<\/p>\r\n<\/li>\r\n<\/ul>\r\n<h3 data-start=\"2055\" data-end=\"2094\">Exemplo de <span style=\"text-decoration: underline;\"><a href=\"https:\/\/www.britecelectric.com\/pt\/product-category\/ac-power-surge-protection\/\" target=\"_blank\" rel=\"noopener\"><strong><em>Produto Britec AC SPD<\/em><\/strong><\/a> <\/span>Faixa<\/h3>\r\n<ul data-start=\"2095\" data-end=\"2701\">\r\n \t<li data-start=\"2095\" data-end=\"2257\">\r\n<p data-start=\"2097\" data-end=\"2257\"><strong data-start=\"2097\" data-end=\"2117\">BR-50GR (Tipo 1)<\/strong>: Classificado para Uc 275\/320\/440 V, com Iimp at\u00e9 25 kA (10\/350 \u00b5s); ideal para prote\u00e7\u00e3o contra raios em entradas de servi\u00e7o em sistemas TN\/TT.<\/p>\r\n<\/li>\r\n \t<li data-start=\"2258\" data-end=\"2392\">\r\n<p data-start=\"2260\" data-end=\"2392\"><strong data-start=\"2260\" data-end=\"2290\">BR-12.5M (h\u00edbrido Tipo 1+2)<\/strong>: Lida com impulsos de raios e surtos de comuta\u00e7\u00e3o, tornando-o adequado para instala\u00e7\u00f5es industriais.<\/p>\r\n<\/li>\r\n \t<li data-start=\"2393\" data-end=\"2583\">\r\n<p data-start=\"2395\" data-end=\"2583\"><strong data-start=\"2395\" data-end=\"2425\">BR-40 e BR-30FU (Tipo 2)<\/strong>: Classificado para Uc 275 V, com In 20 kA \/ Imax 40 kA (8\/20 \u00b5s); o BR-30FU integra um fus\u00edvel reserva, simplificando a instala\u00e7\u00e3o e melhorando a seguran\u00e7a.<\/p>\r\n<\/li>\r\n \t<li data-start=\"2584\" data-end=\"2701\">\r\n<p data-start=\"2586\" data-end=\"2701\"><strong data-start=\"2586\" data-end=\"2613\">BR-230\/BR275-6 (Tipo 3)<\/strong>: Projetado para prote\u00e7\u00e3o de equipamentos terminais, com baixa tens\u00e3o residual (Up \u2264 1,5 kV).<\/p>\r\n<\/li>\r\n<\/ul>\r\n<\/blockquote>\r\n<h2>3. O que \u00e9 prote\u00e7\u00e3o contra surtos DC?<\/h2>\r\n<a href=\"https:\/\/www.britecelectric.com\/pt\/product-category\/dc-surge-protector\/\" rel=\"attachment wp-att-2113\"><img class=\"alignnone wp-image-2113\" src=\"https:\/\/www.britecelectric.com\/wp-content\/uploads\/2025\/06\/Surge-Protection-Devices-For-Solar-PV-1024x1024.webp\" alt=\"Dispositivos de prote\u00e7\u00e3o contra surtos DC\" width=\"600\" height=\"600\" \/><\/a>\r\n\r\n<em><a href=\"https:\/\/www.britecelectric.com\/pt\/product-category\/dc-surge-protector\/\" target=\"_blank\" rel=\"noopener\"><strong data-start=\"361\" data-end=\"384\">Prote\u00e7\u00e3o contra sobretens\u00e3o CC<\/strong><\/a><\/em> foi projetado para sistemas de corrente cont\u00ednua, onde a eletricidade flui em uma \u00fanica dire\u00e7\u00e3o sem cruzamentos naturais de zero. Ao contr\u00e1rio dos sistemas CA que beneficiam de invers\u00f5es peri\u00f3dicas de tens\u00e3o, os sistemas CC apresentam um desafio de engenharia \u00fanico: os arcos n\u00e3o se extinguem automaticamente. Isso significa que os SPDs CC exigem extin\u00e7\u00e3o de arco mais robusta, desconex\u00e3o t\u00e9rmica e mecanismos de libera\u00e7\u00e3o mec\u00e2nica para garantir a seguran\u00e7a e evitar fuga t\u00e9rmica.\r\n<h3 data-start=\"820\" data-end=\"849\">Principais recursos dos SPDs DC<\/h3>\r\n<ul data-start=\"850\" data-end=\"1855\">\r\n \t<li data-start=\"850\" data-end=\"1011\">\r\n<p data-start=\"852\" data-end=\"1011\"><strong data-start=\"852\" data-end=\"871\">Classifica\u00e7\u00f5es de tens\u00e3o<\/strong>: Normalmente projetado para 500 Vcc a 1500 Vcc, abrangendo pain\u00e9is solares fotovoltaicos, sistemas de armazenamento de bateria (BESS) e redes de carregamento r\u00e1pido CC.<\/p>\r\n<\/li>\r\n \t<li data-start=\"1012\" data-end=\"1174\">\r\n<p data-start=\"1014\" data-end=\"1174\"><strong data-start=\"1014\" data-end=\"1047\">Sele\u00e7\u00e3o MOV unidirecional<\/strong>: Para acomodar a polaridade CC, os SPDs CC usam MOVs unidirecionais, garantindo a fixa\u00e7\u00e3o correta de surto para fluxo de corrente unidirecional.<\/p>\r\n<\/li>\r\n \t<li data-start=\"1175\" data-end=\"1364\">\r\n<p data-start=\"1177\" data-end=\"1364\"><strong data-start=\"1177\" data-end=\"1196\">Supress\u00e3o de arco<\/strong>: Como a CC n\u00e3o possui cruzamento zero, os SPDs CC integram seccionadores t\u00e9rmicos de a\u00e7\u00e3o r\u00e1pida, tubos de descarga de g\u00e1s (GDTs) ou c\u00e2maras de arco para interromper com seguran\u00e7a as correntes de falta.<\/p>\r\n<\/li>\r\n \t<li data-start=\"1365\" data-end=\"1538\">\r\n<p data-start=\"1367\" data-end=\"1538\"><strong data-start=\"1367\" data-end=\"1390\">Tratamento de alta sobretens\u00e3o<\/strong>: Constru\u00eddo para absorver surtos de alta energia com classifica\u00e7\u00f5es In\/Imax de at\u00e9 20\u201340 kA (8\/20 \u00b5s) e dispositivos Tipo 1+2 classificados para impulsos de raios Iimp.<\/p>\r\n<\/li>\r\n \t<li data-start=\"1539\" data-end=\"1855\">\r\n<p data-start=\"1541\" data-end=\"1576\"><strong data-start=\"1541\" data-end=\"1573\">Conformidade e Certifica\u00e7\u00e3o<\/strong>:<\/p>\r\n\r\n<ul data-start=\"1579\" data-end=\"1855\">\r\n \t<li data-start=\"1579\" data-end=\"1699\">\r\n<p data-start=\"1581\" data-end=\"1699\">Deve estar em conformidade com IEC 61643-31 (para SPDs fotovoltaicos CC) ou <a href=\"https:\/\/www.nemasurge.org\/ul-1449-transient-voltage-surge-suppressors\/\" target=\"_blank\" rel=\"noopener\"><strong data-start=\"1635\" data-end=\"1646\">UL 1449<\/strong><\/a> (para sistemas DC na Am\u00e9rica do Norte, at\u00e9 1.500 Vcc).<\/p>\r\n<\/li>\r\n \t<li data-start=\"1702\" data-end=\"1855\">\r\n<p data-start=\"1704\" data-end=\"1855\">Dependendo do projeto ou dos requisitos regionais, os produtos podem possuir certifica\u00e7\u00f5es adicionais T\u00dcV, CB ou UL para conformidade da rede e auditorias de seguran\u00e7a.<\/p>\r\n<\/li>\r\n<\/ul>\r\n<\/li>\r\n<\/ul>\r\n<h3 data-start=\"1857\" data-end=\"1906\">Aplica\u00e7\u00f5es t\u00edpicas de prote\u00e7\u00e3o contra surtos CC<\/h3>\r\n<ul data-start=\"1907\" data-end=\"2261\">\r\n \t<li data-start=\"1907\" data-end=\"1999\">\r\n<p data-start=\"1909\" data-end=\"1999\">Matrizes solares fotovoltaicas (prote\u00e7\u00e3o de string ou caixa combinadora, normalmente 1000 Vcc ou 1500 Vcc).<\/p>\r\n<\/li>\r\n \t<li data-start=\"2000\" data-end=\"2084\">\r\n<p data-start=\"2002\" data-end=\"2084\">Sistemas de armazenamento de energia de bateria (BESS) para solu\u00e7\u00f5es em escala de rede ou microrrede.<\/p>\r\n<\/li>\r\n \t<li data-start=\"2085\" data-end=\"2162\">\r\n<p data-start=\"2087\" data-end=\"2162\">Esta\u00e7\u00f5es de carregamento de ve\u00edculos el\u00e9tricos (EV), especialmente carregamento r\u00e1pido DC.<\/p>\r\n<\/li>\r\n \t<li data-start=\"2163\" data-end=\"2261\">\r\n<p data-start=\"2165\" data-end=\"2261\">Torres de telecomunica\u00e7\u00f5es e sistemas de energia renov\u00e1vel (conversores de turbinas e\u00f3licas, redes h\u00edbridas DC).<\/p>\r\n<\/li>\r\n<\/ul>\r\n<h3 data-start=\"2263\" data-end=\"2304\">Exemplos de <span style=\"text-decoration: underline;\"><a href=\"https:\/\/www.britecelectric.com\/pt\/product-category\/dc-surge-protector\/\" target=\"_blank\" rel=\"noopener\">DC SPD da Britec<\/a><\/span> Faixa<\/h3>\r\n<ul data-start=\"2305\" data-end=\"2976\">\r\n \t<li data-start=\"2305\" data-end=\"2630\">\r\n<p data-start=\"2307\" data-end=\"2341\"><a href=\"https:\/\/www.britecelectric.com\/pt\/product\/brpv3-1000-20-1000v-20ka-t12-pv-surge-arrester\/\" target=\"_blank\" rel=\"noopener\"><em><strong data-start=\"2307\" data-end=\"2339\">BRPV3-1000 (Tipo 1+2 DC SPD)<\/strong><\/em><\/a><\/p>\r\n\r\n<ul data-start=\"2344\" data-end=\"2630\">\r\n \t<li data-start=\"2344\" data-end=\"2381\">\r\n<p data-start=\"2346\" data-end=\"2381\">Classifica\u00e7\u00e3o de tens\u00e3o: Uc = 1000 Vcc<\/p>\r\n<\/li>\r\n \t<li data-start=\"2384\" data-end=\"2429\">\r\n<p data-start=\"2386\" data-end=\"2429\">Corrente de descarga nominal: In = 20 kA<\/p>\r\n<\/li>\r\n \t<li data-start=\"2432\" data-end=\"2489\">\r\n<p data-start=\"2434\" data-end=\"2489\">Corrente m\u00e1xima de descarga: Imax = 40 kA (8\/20 \u00b5s)<\/p>\r\n<\/li>\r\n \t<li data-start=\"2492\" data-end=\"2537\">\r\n<p data-start=\"2494\" data-end=\"2537\">N\u00edvel de prote\u00e7\u00e3o de tens\u00e3o: At\u00e9 \u2264 3,8 kV<\/p>\r\n<\/li>\r\n \t<li data-start=\"2540\" data-end=\"2630\">\r\n<p data-start=\"2542\" data-end=\"2630\">Caracter\u00edsticas: Seccionador t\u00e9rmico + sinaliza\u00e7\u00e3o remota para monitoramento em tempo real.<\/p>\r\n<\/li>\r\n<\/ul>\r\n<\/li>\r\n \t<li data-start=\"2632\" data-end=\"2976\">\r\n<p data-start=\"2634\" data-end=\"2668\"><a href=\"https:\/\/www.britecelectric.com\/pt\/product\/brpv3-1500-12-5-t1t2-1500v-12-5ka-pv-surge-protection-device\/\" target=\"_blank\" rel=\"noopener\"><strong data-start=\"2634\" data-end=\"2666\">BRPV3-1500 (Tipo 1+2 DC SPD)<\/strong><\/a><\/p>\r\n\r\n<ul data-start=\"2671\" data-end=\"2976\">\r\n \t<li data-start=\"2671\" data-end=\"2708\">\r\n<p data-start=\"2673\" data-end=\"2708\">Classifica\u00e7\u00e3o de tens\u00e3o: Uc = 1500 Vcc<\/p>\r\n<\/li>\r\n \t<li data-start=\"2711\" data-end=\"2756\">\r\n<p data-start=\"2713\" data-end=\"2756\">Corrente de descarga nominal: In = 20 kA<\/p>\r\n<\/li>\r\n \t<li data-start=\"2759\" data-end=\"2806\">\r\n<p data-start=\"2761\" data-end=\"2806\">Corrente m\u00e1xima de descarga: Imax = 40 kA<\/p>\r\n<\/li>\r\n \t<li data-start=\"2809\" data-end=\"2854\">\r\n<p data-start=\"2811\" data-end=\"2854\">N\u00edvel de prote\u00e7\u00e3o de tens\u00e3o: At\u00e9 \u2264 4,5 kV<\/p>\r\n<\/li>\r\n \t<li data-start=\"2857\" data-end=\"2976\">\r\n<p data-start=\"2859\" data-end=\"2976\">Caracter\u00edsticas: Design de c\u00e2mara de arco + corte t\u00e9rmico, garantindo opera\u00e7\u00e3o confi\u00e1vel em usinas fotovoltaicas e infraestrutura EV.<\/p>\r\n<\/li>\r\n<\/ul>\r\n<\/li>\r\n<\/ul>\r\n<h2>4. Qual \u00e9 a diferen\u00e7a entre prote\u00e7\u00e3o contra surtos CA e CC?<\/h2>\r\nEmbora os SPDs CA e os SPDs DC pare\u00e7am semelhantes \u00e0 primeira vista, seus princ\u00edpios de design, padr\u00f5es e requisitos de aplica\u00e7\u00e3o s\u00e3o muito diferentes. A tabela abaixo resume as principais diferen\u00e7as entre AC SPD e DC SPD:\r\n<table style=\"width: 100%; height: 336px;\">\r\n<thead>\r\n<tr style=\"height: 24px;\">\r\n<th style=\"height: 24px;\"><strong>Par\u00e2metro<\/strong><\/th>\r\n<th style=\"height: 24px;\"><strong>AC SPD<\/strong><\/th>\r\n<th style=\"height: 24px;\"><strong>DC SPD<\/strong><\/th>\r\n<\/tr>\r\n<\/thead>\r\n<tbody>\r\n<tr style=\"height: 48px;\">\r\n<td style=\"height: 48px;\"><strong>Faixa de tens\u00e3o<\/strong><\/td>\r\n<td style=\"height: 48px;\">115V \u2013 690V AC (redes comuns) Exemplo: BR-40 (Uc 275 V, In 20 kA)<\/td>\r\n<td style=\"height: 48px;\">500V \u2013 1500V DC (PV, EV, BESS) Exemplo: BRPV3-1500 (Uc 1500 Vdc, In 20 kA)<\/td>\r\n<\/tr>\r\n<tr style=\"height: 24px;\">\r\n<td style=\"height: 24px;\"><strong>Tratamento de polaridade<\/strong><\/td>\r\n<td style=\"height: 24px;\">Opera\u00e7\u00e3o bidirecional (comuta\u00e7\u00e3o de polaridade de onda senoidal CA)<\/td>\r\n<td style=\"height: 24px;\">Sele\u00e7\u00e3o MOV unidirecional para estabilidade de polaridade DC<\/td>\r\n<\/tr>\r\n<tr style=\"height: 48px;\">\r\n<td style=\"height: 48px;\"><strong>Extin\u00e7\u00e3o de arco<\/strong><\/td>\r\n<td style=\"height: 48px;\">O cruzamento de zero natural auxilia na interrup\u00e7\u00e3o do arco Os SPDs tipo 1 geralmente usam MOV + GDT\/c\u00e2mara de arco para impulsos de 10\/350 \u00b5s<\/td>\r\n<td style=\"height: 48px;\">Sem cruzamento de zero \u2192 requer seccionador t\u00e9rmico r\u00e1pido, c\u00e2mara de arco ou GDT<\/td>\r\n<\/tr>\r\n<tr style=\"height: 24px;\">\r\n<td style=\"height: 24px;\"><strong>Tempo de resposta<\/strong><\/td>\r\n<td style=\"height: 24px;\">SPDs baseados em MOV normalmente respondem em &lt;25 ns (dependente do dispositivo)<\/td>\r\n<td style=\"height: 24px;\">Mesmo princ\u00edpio \u2013 baseado em MOV, &lt;25 ns (dependente do dispositivo)<\/td>\r\n<\/tr>\r\n<tr style=\"height: 24px;\">\r\n<td style=\"height: 24px;\"><strong>Tipo de forma de onda<\/strong><\/td>\r\n<td style=\"height: 24px;\">Senoidal (50\/60 Hz)<\/td>\r\n<td style=\"height: 24px;\">Tens\u00e3o CC constante<\/td>\r\n<\/tr>\r\n<tr style=\"height: 48px;\">\r\n<td style=\"height: 48px;\"><strong>Formas de onda de teste de surto<\/strong><\/td>\r\n<td style=\"height: 48px;\">8\/20 \u00b5s (comuta\u00e7\u00e3o), 10\/350 \u00b5s (raios, tipo 1)<\/td>\r\n<td style=\"height: 48px;\">Padronizado como AC (8\/20 \u00b5s, 10\/350 \u00b5s); diferen\u00e7a chave = extin\u00e7\u00e3o de arco<\/td>\r\n<\/tr>\r\n<tr style=\"height: 48px;\">\r\n<td style=\"height: 48px;\"><strong>Manuseio de Energia<\/strong><\/td>\r\n<td style=\"height: 48px;\">A classifica\u00e7\u00e3o por polo depende do projeto (verifique a folha de dados: In\/Imax\/Iimp) Exemplo: <strong>BR-30FU (Em 20 kA, Imax 40 kA)<\/strong><\/td>\r\n<td style=\"height: 48px;\">A classifica\u00e7\u00e3o por polo depende do projeto (In\/Imax\/Iimp) Exemplo: BRPV3-1000 (In 20 kA, Imax 40 kA)<\/td>\r\n<\/tr>\r\n<tr style=\"height: 24px;\">\r\n<td style=\"height: 24px;\"><strong>Padr\u00f5es<\/strong><\/td>\r\n<td style=\"height: 24px;\">IEC 61643-11 (SPDs AC), UL 1449 (Am\u00e9rica do Norte)<\/td>\r\n<td style=\"height: 24px;\">IEC 61643-31 (SPDs CC, PV), UL 1449 (Am\u00e9rica do Norte, PV \u22641500 Vcc)<\/td>\r\n<\/tr>\r\n<tr style=\"height: 24px;\">\r\n<td style=\"height: 24px;\"><strong>Aplica\u00e7\u00f5es<\/strong><\/td>\r\n<td style=\"height: 24px;\">Resid\u00eancias, escrit\u00f3rios, pain\u00e9is de controle industrial, quadros de distribui\u00e7\u00e3o predial<\/td>\r\n<td style=\"height: 24px;\">Matrizes solares fotovoltaicas, armazenamento de bateria, carregamento de ve\u00edculos el\u00e9tricos, telecomunica\u00e7\u00f5es, turbinas e\u00f3licas<\/td>\r\n<\/tr>\r\n<\/tbody>\r\n<\/table>\r\n<h3>4.1 Caracter\u00edsticas da Corrente El\u00e9trica: CA vs.<\/h3>\r\nAC inverte a dire\u00e7\u00e3o periodicamente (onda senoidal), permitindo pontos naturais de cruzamento de zero. A CC flui continuamente em uma \u00fanica dire\u00e7\u00e3o (forma de onda plana), tornando a extin\u00e7\u00e3o do arco muito mais desafiadora.\r\n\r\n<strong>Implica\u00e7\u00e3o:<\/strong>\r\n<blockquote>Os SPDs CA se beneficiam do cruzamento zero para interrup\u00e7\u00e3o do arco, enquanto os SPDs CC exigem mecanismos de supress\u00e3o de arco mais robustos devido \u00e0s caracter\u00edsticas da forma de onda.<\/blockquote>\r\n<h3>4.2 Forma de onda de surto<\/h3>\r\n<ul data-spread=\"false\">\r\n \t<li>Os surtos de CA geralmente t\u00eam formas de onda senoidais mais suaves.<\/li>\r\n \t<li>Os surtos CC s\u00e3o mais curtos, mais r\u00e1pidos e mais abruptos com tens\u00e3o superior plana<\/li>\r\n<\/ul>\r\n<strong>Necessidades de tempo de resposta:<\/strong>\r\n<blockquote>Os SPDs DC normalmente exigem tempos de resposta mais r\u00e1pidos (\u226425ns) para prote\u00e7\u00e3o contra transientes r\u00e1pidos.<\/blockquote>\r\n<h3>4.3 Princ\u00edpios de Projeto e Opera\u00e7\u00e3o de DPSs<\/h3>\r\n<ul data-spread=\"false\">\r\n \t<li><strong>AC SPD:<\/strong> Projetado para polaridade de tens\u00e3o sim\u00e9trica e entrada de onda senoidal<\/li>\r\n \t<li><strong>DCSPD:<\/strong> Constru\u00eddo para circuitos sens\u00edveis \u00e0 polaridade e fluxo de corrente unidirecional<\/li>\r\n<\/ul>\r\n<strong>Tecnologia usada: <\/strong>Os dispositivos SPD CA e CC geralmente usam MOVs (varistores de \u00f3xido met\u00e1lico), desconex\u00f5es t\u00e9rmicas e, \u00e0s vezes, GDTs (tubos de descarga de g\u00e1s). Para entender como esses componentes funcionam dentro de um dispositivo de prote\u00e7\u00e3o contra surtos, consulte nosso guia detalhado em <strong><em><a href=\"https:\/\/www.britecelectric.com\/pt\/blog\/how-does-spd-surge-protection-device-work\/\" target=\"_blank\" rel=\"noopener\">como funciona um SPD<\/a>.<\/em><\/strong>\r\n<h3>4.4 Classifica\u00e7\u00f5es de tens\u00e3o e capacidade de surto<\/h3>\r\n<ul data-spread=\"false\">\r\n \t<li>SPDs AC: Faixa de 115V a 600V<\/li>\r\n \t<li>SPDs DC: Faixa de 500V a 1500V<\/li>\r\n<\/ul>\r\n<strong>Exemplo:<\/strong>\r\n<blockquote>DC SPD FLY1-40PV suporta at\u00e9 40kA; AC SPD USP2 varia at\u00e9 120kA, dependendo do modelo.<\/blockquote>\r\n<h3>4.5 Ambientes de Aplica\u00e7\u00e3o<\/h3>\r\n<ul data-spread=\"false\">\r\n \t<li><strong>AC SPD:<\/strong> Escrit\u00f3rios, resid\u00eancias, HVAC, pain\u00e9is de controle<\/li>\r\n \t<li><strong>DCSPD:<\/strong> Energia renov\u00e1vel, telecomunica\u00e7\u00f5es externas, sistemas de transporte<\/li>\r\n<\/ul>\r\n<strong>Toler\u00e2ncia Ambiental:<\/strong>\r\n<blockquote>Os SPDs DC geralmente suportam faixas mais amplas de temperatura e umidade relativa devido a aplica\u00e7\u00f5es externas.<\/blockquote>\r\n<h3>4.6 Extin\u00e7\u00e3o de Arco<\/h3>\r\n<ul data-spread=\"false\">\r\n \t<li><strong>CA:<\/strong> O arco se extingue naturalmente no cruzamento zero<\/li>\r\n \t<li><strong>CD:<\/strong> Requer extin\u00e7\u00e3o de arco mec\u00e2nico\/t\u00e9rmico devido \u00e0 falta de invers\u00e3o de polaridade.<\/li>\r\n<\/ul>\r\n<strong>Por que \u00e9 importante:<\/strong>\r\n<blockquote>A supress\u00e3o inadequada de arco em p\u00e1ra-raios CC pode causar fuga t\u00e9rmica e inc\u00eandio.<\/blockquote>\r\n<h3>4.7 Padr\u00f5es, Testes e Certifica\u00e7\u00e3o<\/h3>\r\n<ul data-spread=\"false\">\r\n \t<li><strong>Padr\u00f5es AC SPD:<\/strong> UL 1449, IEC 61643-11 (Tipo 1, 2, 3)<\/li>\r\n \t<li><strong>Padr\u00f5es DC SPD:<\/strong> EN 50539-11, IEC 61643-31, UL 1449 (foco PV, BESS, EV)<\/li>\r\n<\/ul>\r\n<strong>Exemplo:<\/strong>\r\n<blockquote>A classe de prote\u00e7\u00e3o contra surtos deve ser verificada por meio de etiquetas SPD certificadas pela TUV para conformidade com a rede.<\/blockquote>\r\n<h2>5. Como escolher o SPD certo<\/h2>\r\n<p data-start=\"408\" data-end=\"648\">A sele\u00e7\u00e3o do dispositivo de prote\u00e7\u00e3o contra surtos (SPD) correto n\u00e3o se trata apenas de classifica\u00e7\u00e3o de tens\u00e3o \u2013 envolve tamb\u00e9m posi\u00e7\u00e3o de instala\u00e7\u00e3o, coordena\u00e7\u00e3o de prote\u00e7\u00e3o e conformidade com padr\u00f5es internacionais. Aqui est\u00e3o os principais fatores a serem considerados:<\/p>\r\n\r\n<h3 data-start=\"655\" data-end=\"700\">1. Combine o SPD com a tens\u00e3o do seu sistema<\/h3>\r\n<ul data-start=\"701\" data-end=\"1201\">\r\n \t<li data-start=\"701\" data-end=\"930\">\r\n<p data-start=\"703\" data-end=\"744\"><strong data-start=\"703\" data-end=\"742\">Sistemas CA (IEC 61643-11 \/ UL 1449)<\/strong><\/p>\r\n\r\n<ul data-start=\"747\" data-end=\"930\">\r\n \t<li data-start=\"747\" data-end=\"803\">\r\n<p data-start=\"749\" data-end=\"803\">230\/400 V (redes TN\/TT): Escolha <strong data-start=\"781\" data-end=\"793\">Uc 275 V<\/strong> modelos.<\/p>\r\n<\/li>\r\n \t<li data-start=\"806\" data-end=\"930\">\r\n<p data-start=\"808\" data-end=\"930\">Exemplo: Britec BR-40\/30FU \u2013 SPD Tipo 2, Uc 275 V, In 20 kA, Imax 40 kA, com fus\u00edvel integrado para prote\u00e7\u00e3o de backup.<\/p>\r\n<\/li>\r\n<\/ul>\r\n<\/li>\r\n \t<li data-start=\"931\" data-end=\"1201\">\r\n<p data-start=\"933\" data-end=\"987\"><strong data-start=\"933\" data-end=\"985\">Sistemas fotovoltaicos CC (IEC 61643-31 \/ UL 1449 \u22641500 Vcc)<\/strong><\/p>\r\n\r\n<ul data-start=\"990\" data-end=\"1201\">\r\n \t<li data-start=\"990\" data-end=\"1062\">\r\n<p data-start=\"992\" data-end=\"1062\">Matrizes de 600 Vcc, 1000 Vcc ou 1500 Vcc: Selecione a classifica\u00e7\u00e3o DC Uc correspondente.<\/p>\r\n<\/li>\r\n \t<li data-start=\"1065\" data-end=\"1201\">\r\n<p data-start=\"1067\" data-end=\"1201\">Exemplo: <strong data-start=\"1076\" data-end=\"1111\">Britec BRPV3-1000 (Uc 1000 Vcc)<\/strong> ou <strong data-start=\"1115\" data-end=\"1143\">BRPV3-1500 (Uc 1500 Vcc)<\/strong> \u2013 SPDs DC tipo 1+2 para caixas combinadoras fotovoltaicas e inversores.<\/p>\r\n<\/li>\r\n<\/ul>\r\n<\/li>\r\n<\/ul>\r\n<p data-start=\"1203\" data-end=\"1342\"><strong data-start=\"1205\" data-end=\"1212\">Dica<\/strong>: Verifique sempre se a Uc (tens\u00e3o de opera\u00e7\u00e3o cont\u00ednua) do SPD \u00e9 \u2265 1,2 \u00d7 tens\u00e3o nominal do sistema para evitar envelhecimento prematuro.<\/p>\r\n\r\n<h3 data-start=\"1349\" data-end=\"1424\">2. Aplique a classe (tipo) de prote\u00e7\u00e3o correta para cada n\u00edvel de instala\u00e7\u00e3o<\/h3>\r\n<ul data-start=\"1425\" data-end=\"2052\">\r\n \t<li data-start=\"1425\" data-end=\"1627\">\r\n<p data-start=\"1427\" data-end=\"1469\">Tipo 1 (corrente atmosf\u00e9rica de 10\/350 \u00b5s)<\/p>\r\n\r\n<ul data-start=\"1472\" data-end=\"1627\">\r\n \t<li data-start=\"1472\" data-end=\"1530\">\r\n<p data-start=\"1474\" data-end=\"1530\">Instalado na entrada de servi\u00e7o\/distribui\u00e7\u00e3o principal.<\/p>\r\n<\/li>\r\n \t<li data-start=\"1533\" data-end=\"1571\">\r\n<p data-start=\"1535\" data-end=\"1571\">Lida com correntes diretas de raios.<\/p>\r\n<\/li>\r\n \t<li data-start=\"1574\" data-end=\"1627\">\r\n<p data-start=\"1576\" data-end=\"1627\">Exemplo: <strong data-start=\"1585\" data-end=\"1610\">BR-12.5M Tipo 1+2 SPD<\/strong>, Iimp 12,5 kA.<\/p>\r\n<\/li>\r\n<\/ul>\r\n<\/li>\r\n \t<li data-start=\"1628\" data-end=\"1865\">\r\n<p data-start=\"1630\" data-end=\"1669\">Tipo 2 (surtos de comuta\u00e7\u00e3o de 8\/20 \u00b5s)<\/p>\r\n\r\n<ul data-start=\"1672\" data-end=\"1865\">\r\n \t<li data-start=\"1672\" data-end=\"1719\">\r\n<p data-start=\"1674\" data-end=\"1719\">Instalado em quadros de distribui\u00e7\u00e3o de piso.<\/p>\r\n<\/li>\r\n \t<li data-start=\"1722\" data-end=\"1792\">\r\n<p data-start=\"1724\" data-end=\"1792\">Protege contra surtos de comuta\u00e7\u00e3o e correntes residuais de raios.<\/p>\r\n<\/li>\r\n \t<li data-start=\"1795\" data-end=\"1865\">\r\n<p data-start=\"1797\" data-end=\"1865\">Exemplo: <strong data-start=\"1806\" data-end=\"1831\">BR-40\/30FU Tipo 2 SPD<\/strong> (com seccionador integrado).<\/p>\r\n<\/li>\r\n<\/ul>\r\n<\/li>\r\n \t<li data-start=\"1866\" data-end=\"2052\">\r\n<p data-start=\"1868\" data-end=\"1895\">Tipo 3 (ponto de uso)<\/p>\r\n\r\n<ul data-start=\"1898\" data-end=\"2052\">\r\n \t<li data-start=\"1898\" data-end=\"1983\">\r\n<p data-start=\"1900\" data-end=\"1983\">Instalado pr\u00f3ximo a equipamentos sens\u00edveis (computadores, servidores, dispositivos m\u00e9dicos).<\/p>\r\n<\/li>\r\n \t<li data-start=\"1986\" data-end=\"2052\">\r\n<p data-start=\"1988\" data-end=\"2052\">Protege contra surtos residuais n\u00e3o limitados pelos SPDs a montante.<\/p>\r\n<\/li>\r\n<\/ul>\r\n<\/li>\r\n<\/ul>\r\n<p data-start=\"2054\" data-end=\"2204\"><strong data-start=\"2056\" data-end=\"2076\">Regra de engenharia<\/strong>: Se o comprimento do cabo entre dois est\u00e1gios de prote\u00e7\u00e3o for <strong data-start=\"2131\" data-end=\"2140\">&gt;<\/strong>10 m, instale SPDs adicionais em ambas as extremidades para garantir a coordena\u00e7\u00e3o.<\/p>\r\n\r\n<h3 data-start=\"2211\" data-end=\"2261\">3. Garanta a coordena\u00e7\u00e3o com disjuntores e fus\u00edveis<\/h3>\r\n<ul data-start=\"2262\" data-end=\"2455\">\r\n \t<li data-start=\"2262\" data-end=\"2330\">\r\n<p data-start=\"2264\" data-end=\"2330\">Os SPDs devem ser coordenados com fus\u00edveis MCB\/RCB\/backup a montante.<\/p>\r\n<\/li>\r\n \t<li data-start=\"2331\" data-end=\"2455\">\r\n<p data-start=\"2333\" data-end=\"2455\">Alguns modelos, como <strong data-start=\"2351\" data-end=\"2372\">Britec BR-40\/30FU<\/strong>, integram seccionadores t\u00e9rmicos e prote\u00e7\u00e3o de backup, reduzindo espa\u00e7o e custos.<\/p>\r\n<\/li>\r\n<\/ul>\r\n<h3 data-start=\"2462\" data-end=\"2496\">4. Conformidade com os padr\u00f5es<\/h3>\r\n<ul data-start=\"2497\" data-end=\"2605\">\r\n \t<li data-start=\"2497\" data-end=\"2543\">\r\n<p data-start=\"2499\" data-end=\"2543\"><strong data-start=\"2499\" data-end=\"2510\">SPDs CA<\/strong>: IEC 61643-11, UL 1449<\/p>\r\n<\/li>\r\n \t<li data-start=\"2544\" data-end=\"2605\">\r\n<p data-start=\"2546\" data-end=\"2605\"><strong data-start=\"2546\" data-end=\"2560\">SPDs fotovoltaicos CC<\/strong>: IEC 61643-31, UL 1449 (\u22641500 Vcc)<\/p>\r\n<\/li>\r\n<\/ul>\r\n<p data-start=\"2607\" data-end=\"2731\">Certifique-se sempre de que o SPD possua as certifica\u00e7\u00f5es de teste CE, UL ou IEC adequadas, especialmente para projetos internacionais.<\/p>\r\n\r\n<h3 data-start=\"2738\" data-end=\"2756\">Principal vantagem<\/h3>\r\n<p data-start=\"2757\" data-end=\"2931\">Escolher o SPD certo significa combinar a tens\u00e3o, selecionar o tipo correto por n\u00edvel de instala\u00e7\u00e3o, garantir a coordena\u00e7\u00e3o adequada e cumprir os padr\u00f5es IEC\/UL.<\/p>\r\n<p data-start=\"2933\" data-end=\"3142\">Com <strong data-start=\"2938\" data-end=\"3007\">Portf\u00f3lio da Britec (BR-12.5M, BR-40\/30FU, BRPV3-1000, BRPV3-1500)<\/strong>, voc\u00ea pode cobrir aplica\u00e7\u00f5es solares residenciais, comerciais, industriais e fotovoltaicas com prote\u00e7\u00e3o contra sobretens\u00e3o certificada e de alto desempenho.<\/p>\r\n\r\n<h2>6. Conclus\u00e3o<\/h2>\r\nOs dispositivos de prote\u00e7\u00e3o contra surtos CA e CC podem parecer semelhantes, mas atendem a sistemas fundamentalmente diferentes. Os SPDs AC s\u00e3o otimizados para aplica\u00e7\u00f5es de onda senoidal em edif\u00edcios e redes. Os SPDs CC s\u00e3o adaptados para formas de onda de tens\u00e3o plana em infraestruturas CC renov\u00e1veis \u200b\u200be de alta tens\u00e3o.\r\n\r\n<strong>A escolha do SPD correto \u00e9 essencial para proteger o equipamento e manter a conformidade com os padr\u00f5es de seguran\u00e7a.<\/strong>\r\n\r\nPara garantir prote\u00e7\u00e3o ideal:\r\n<ul data-spread=\"false\">\r\n \t<li>Sempre combine o tipo de SPD com o sistema atual (CA ou CC)<\/li>\r\n \t<li>Considere a classifica\u00e7\u00e3o de tens\u00e3o, as caracter\u00edsticas da forma de onda e a capacidade de absor\u00e7\u00e3o de energia necess\u00e1ria.<\/li>\r\n \t<li>Escolha produtos certificados (TUV, UL, CE) com classifica\u00e7\u00f5es apropriadas de classe de prote\u00e7\u00e3o contra surtos.<\/li>\r\n<\/ul>\r\n<a href=\"https:\/\/www.britecelectric.com\/pt\/contact-us\/\" target=\"_blank\" rel=\"noopener\"><strong>Precisa de ajuda para selecionar seu SPD?<\/strong> Entre em contato com um eletricista certificado ou um fornecedor de prote\u00e7\u00e3o contra surtos para encontrar a solu\u00e7\u00e3o certa de prote\u00e7\u00e3o contra surtos de CC ou de CA para o seu sistema.<\/a>","protected":false},"featured_media":2114,"parent":0,"menu_order":130,"template":"","meta":{"_acf_changed":false},"blog_category":[9],"class_list":["post-2112","blog","type-blog","status-publish","has-post-thumbnail","hentry","blog_category-industry-news"],"acf":{"des":"This blog compares AC and DC surge protection devices (SPDs), explaining their key differences in waveform, voltage range, arc handling, and application scenarios. Whether you're protecting a home, solar system, or EV charger, understanding how to choose the right SPD is essential for system safety and compliance with standards like IEC 61643 and UL 1449.","txt":"Surge protection is fundamental to the safety and uptime of modern electrical systems. Choosing the right <a href=\"https:\/\/www.britecelectric.com\/products\/\" target=\"_blank\" rel=\"noopener\"><strong data-start=\"1300\" data-end=\"1333\">Surge Protective Device (SPD)<\/strong><\/a> starts with understanding how AC and DC systems behave differently under transients\u2014especially arc extinction (AC zero-crossing vs DC no zero-crossing) and component design (bi-directional vs uni-directional MOVs). This guide explains the difference between AC SPD and DC SPD, maps the IEC\/UL standards that apply, and shows how to select an SPD that meets your application and compliance needs.\r\n<h2>1. Introduction<\/h2>\r\nTransient overvoltages, also known as power surges, are short-duration spikes in voltage that can damage or destroy sensitive electronic equipment. These surges can be caused by lightning strikes, grid switching operations, large load switching, or inductive equipment startups. SPD devices, also called surge suppressors or surge arresters, are engineered to detect and divert these spikes before they reach protected equipment.\r\n\r\nBut not all surges\u2014or SPDs\u2014are created equal. AC (Alternating Current) and DC (Direct Current) systems exhibit very different electrical behaviors and, as such, require distinct surge protection approaches. Per <a href=\"https:\/\/webstore.iec.ch\/en\/publication\/26931\" target=\"_blank\" rel=\"noopener\"><strong><em>IEC 61643-11\/-31<\/em><\/strong><\/a>, an SPD limits surge voltage and diverts surge current within nanoseconds, protecting downstream equipment.\r\n<h2>2. What Is AC Surge Protection?<\/h2>\r\n<a href=\"https:\/\/www.britecelectric.com\/product-category\/ac-power-surge-protection\/\" rel=\"attachment wp-att-2114\"><img class=\"alignnone wp-image-2114\" src=\"https:\/\/www.britecelectric.com\/wp-content\/uploads\/2025\/06\/AC-Power-Surge-Protection-1024x1024.webp\" alt=\"\" width=\"600\" height=\"600\" \/><\/a>\r\n\r\n<a href=\"https:\/\/www.britecelectric.com\/product-category\/ac-power-surge-protection\/\" target=\"_blank\" rel=\"noopener\"><em><strong data-start=\"218\" data-end=\"241\">AC surge protection<\/strong><\/em><\/a> is designed for electrical systems where voltage alternates direction periodically\u2014typically at 50Hz or 60Hz. These systems are widely used in residential homes, commercial buildings, factories, and industrial automation networks. According to <a href=\"https:\/\/webstore.iec.ch\/en\/publication\/65314\" target=\"_blank\" rel=\"noopener\"><strong data-start=\"490\" data-end=\"506\">IEC 61643-11<\/strong><\/a>, AC SPDs are classified into Type 1, Type 2, and Type 3, each intended for a different installation point within the distribution system.\r\n<h3 data-start=\"652\" data-end=\"688\">Key Characteristics of AC SPDs<\/h3>\r\n<ul data-start=\"689\" data-end=\"1410\">\r\n \t<li data-start=\"689\" data-end=\"777\">\r\n<p data-start=\"691\" data-end=\"777\">Operate within common grid voltages such as 115V, 230V, 400V, and up to 690V AC.<\/p>\r\n<\/li>\r\n \t<li data-start=\"778\" data-end=\"857\">\r\n<p data-start=\"780\" data-end=\"857\">Bi-directional operation to handle polarity switching of AC sine waves.<\/p>\r\n<\/li>\r\n \t<li data-start=\"858\" data-end=\"983\">\r\n<p data-start=\"860\" data-end=\"983\">Arc extinction through natural zero-crossings of the AC waveform, which makes disconnection safer and more efficient.<\/p>\r\n<\/li>\r\n \t<li data-start=\"984\" data-end=\"1220\">\r\n<p data-start=\"986\" data-end=\"1220\">Commonly used MOVs (Metal Oxide Varistors) to absorb surge energy; in Type 1 SPDs, MOVs are often combined with GDTs (Gas Discharge Tubes) or arc chambers to withstand high-energy lightning impulses (10\/350 \u00b5s waveforms).<\/p>\r\n<\/li>\r\n \t<li data-start=\"1221\" data-end=\"1410\">\r\n<p data-start=\"1223\" data-end=\"1410\">Coordination with upstream protection (MCB or fuse) is required; best practice is to keep the SPD lead length as short as possible, ideally&lt;0.5 m, to minimize residual voltage.<\/p>\r\n<\/li>\r\n<\/ul>\r\n<blockquote>\r\n<h3 data-start=\"1412\" data-end=\"1447\">SPD Types for AC Applications<\/h3>\r\n<ul data-start=\"1448\" data-end=\"1800\">\r\n \t<li data-start=\"1448\" data-end=\"1558\">\r\n<p data-start=\"1450\" data-end=\"1558\"><strong data-start=\"1450\" data-end=\"1464\">Type 1 SPD<\/strong> \u2013 Installed at the service entrance; withstands direct lightning currents (Iimp 10\/350 \u00b5s).<\/p>\r\n<\/li>\r\n \t<li data-start=\"1559\" data-end=\"1689\">\r\n<p data-start=\"1561\" data-end=\"1689\"><strong data-start=\"1561\" data-end=\"1575\">Type 2 SPD<\/strong> \u2013 Installed at distribution boards; protects against switching surges and indirect lightning (In\/Imax 8\/20 \u00b5s).<\/p>\r\n<\/li>\r\n \t<li data-start=\"1690\" data-end=\"1800\">\r\n<p data-start=\"1692\" data-end=\"1800\"><strong data-start=\"1692\" data-end=\"1706\">Type 3 SPD<\/strong> \u2013 Installed close to sensitive equipment; provides fine protection against residual surges.<\/p>\r\n<\/li>\r\n<\/ul>\r\n<h3 data-start=\"1802\" data-end=\"1828\">Typical Applications<\/h3>\r\n<ul data-start=\"1829\" data-end=\"2053\">\r\n \t<li data-start=\"1829\" data-end=\"1870\">\r\n<p data-start=\"1831\" data-end=\"1870\">Main service entrance panels (Type 1)<\/p>\r\n<\/li>\r\n \t<li data-start=\"1871\" data-end=\"1912\">\r\n<p data-start=\"1873\" data-end=\"1912\">Building distribution boards (Type 2)<\/p>\r\n<\/li>\r\n \t<li data-start=\"1913\" data-end=\"1967\">\r\n<p data-start=\"1915\" data-end=\"1967\">Control panels in industrial environments (Type 2)<\/p>\r\n<\/li>\r\n \t<li data-start=\"1968\" data-end=\"2053\">\r\n<p data-start=\"1970\" data-end=\"2053\">Point-of-use or socket-level protection for sensitive AC-powered devices (Type 3)<\/p>\r\n<\/li>\r\n<\/ul>\r\n<h3 data-start=\"2055\" data-end=\"2094\">Example from <span style=\"text-decoration: underline;\"><a href=\"https:\/\/www.britecelectric.com\/product-category\/ac-power-surge-protection\/\" target=\"_blank\" rel=\"noopener\"><strong><em>Britec AC SPD Product<\/em><\/strong><\/a> <\/span>Range<\/h3>\r\n<ul data-start=\"2095\" data-end=\"2701\">\r\n \t<li data-start=\"2095\" data-end=\"2257\">\r\n<p data-start=\"2097\" data-end=\"2257\"><strong data-start=\"2097\" data-end=\"2117\">BR-50GR (Type 1)<\/strong>: Rated for Uc 275\/320\/440 V, with Iimp up to 25 kA (10\/350 \u00b5s); ideal for service entrance lightning protection in TN\/TT systems.<\/p>\r\n<\/li>\r\n \t<li data-start=\"2258\" data-end=\"2392\">\r\n<p data-start=\"2260\" data-end=\"2392\"><strong data-start=\"2260\" data-end=\"2290\">BR-12.5M (Type 1+2 hybrid)<\/strong>: Handles both lightning impulse and switching surges, making it suitable for industrial facilities.<\/p>\r\n<\/li>\r\n \t<li data-start=\"2393\" data-end=\"2583\">\r\n<p data-start=\"2395\" data-end=\"2583\"><strong data-start=\"2395\" data-end=\"2425\">BR-40 and BR-30FU (Type 2)<\/strong>: Rated for Uc 275 V, with In 20 kA \/ Imax 40 kA (8\/20 \u00b5s); the BR-30FU integrates a backup fuse, simplifying installation and improving safety.<\/p>\r\n<\/li>\r\n \t<li data-start=\"2584\" data-end=\"2701\">\r\n<p data-start=\"2586\" data-end=\"2701\"><strong data-start=\"2586\" data-end=\"2613\">BR-230\/BR275-6 (Type 3)<\/strong>: Designed for terminal equipment protection, with low residual voltage (Up \u2264 1.5 kV).<\/p>\r\n<\/li>\r\n<\/ul>\r\n<\/blockquote>\r\n<h2>3. What Is DC Surge Protection?<\/h2>\r\n<a href=\"https:\/\/www.britecelectric.com\/product-category\/dc-surge-protector\/\" rel=\"attachment wp-att-2113\"><img class=\"alignnone wp-image-2113\" src=\"https:\/\/www.britecelectric.com\/wp-content\/uploads\/2025\/06\/Surge-Protection-Devices-For-Solar-PV-1024x1024.webp\" alt=\"DC Surge Protection Devices\" width=\"600\" height=\"600\" \/><\/a>\r\n\r\n<em><a href=\"https:\/\/www.britecelectric.com\/product-category\/dc-surge-protector\/\" target=\"_blank\" rel=\"noopener\"><strong data-start=\"361\" data-end=\"384\">DC surge protection<\/strong><\/a><\/em> is designed for direct current systems, where electricity flows in a single direction without natural zero-crossings. Unlike AC systems that benefit from periodic voltage reversals, DC systems present a unique engineering challenge: arcs do not self-extinguish. This means that DC SPDs require more robust arc quenching, thermal disconnection, and mechanical release mechanisms to ensure safety and prevent thermal runaway.\r\n<h3 data-start=\"820\" data-end=\"849\">Key Features of DC SPDs<\/h3>\r\n<ul data-start=\"850\" data-end=\"1855\">\r\n \t<li data-start=\"850\" data-end=\"1011\">\r\n<p data-start=\"852\" data-end=\"1011\"><strong data-start=\"852\" data-end=\"871\">Voltage Ratings<\/strong>: Typically designed for 500 Vdc to 1500 Vdc, covering solar PV arrays, battery storage systems (BESS), and DC fast-charging networks.<\/p>\r\n<\/li>\r\n \t<li data-start=\"1012\" data-end=\"1174\">\r\n<p data-start=\"1014\" data-end=\"1174\"><strong data-start=\"1014\" data-end=\"1047\">Unidirectional MOV selection<\/strong>: To accommodate DC polarity, DC SPDs use unidirectional MOVs, ensuring correct surge clamping for one-way current flow.<\/p>\r\n<\/li>\r\n \t<li data-start=\"1175\" data-end=\"1364\">\r\n<p data-start=\"1177\" data-end=\"1364\"><strong data-start=\"1177\" data-end=\"1196\">Arc Suppression<\/strong>: Because DC lacks a zero-crossing, DC SPDs integrate fast-acting thermal disconnects, gas discharge tubes (GDTs), or arc chambers to safely break fault currents.<\/p>\r\n<\/li>\r\n \t<li data-start=\"1365\" data-end=\"1538\">\r\n<p data-start=\"1367\" data-end=\"1538\"><strong data-start=\"1367\" data-end=\"1390\">High Surge Handling<\/strong>: Built to absorb high-energy surges with In\/Imax ratings up to 20\u201340 kA (8\/20 \u00b5s) and Type 1+2 devices rated for Iimp lightning impulses.<\/p>\r\n<\/li>\r\n \t<li data-start=\"1539\" data-end=\"1855\">\r\n<p data-start=\"1541\" data-end=\"1576\"><strong data-start=\"1541\" data-end=\"1573\">Compliance and Certification<\/strong>:<\/p>\r\n\r\n<ul data-start=\"1579\" data-end=\"1855\">\r\n \t<li data-start=\"1579\" data-end=\"1699\">\r\n<p data-start=\"1581\" data-end=\"1699\">Must comply with IEC 61643-31 (for PV DC SPDs) or <a href=\"https:\/\/www.nemasurge.org\/ul-1449-transient-voltage-surge-suppressors\/\" target=\"_blank\" rel=\"noopener\"><strong data-start=\"1635\" data-end=\"1646\">UL 1449<\/strong><\/a> (for DC systems in North America, up to 1500 Vdc).<\/p>\r\n<\/li>\r\n \t<li data-start=\"1702\" data-end=\"1855\">\r\n<p data-start=\"1704\" data-end=\"1855\">Depending on project or regional requirements, products may carry additional T\u00dcV, CB, or UL certifications for grid compliance and safety audits.<\/p>\r\n<\/li>\r\n<\/ul>\r\n<\/li>\r\n<\/ul>\r\n<h3 data-start=\"1857\" data-end=\"1906\">Typical Applications of DC Surge Protection<\/h3>\r\n<ul data-start=\"1907\" data-end=\"2261\">\r\n \t<li data-start=\"1907\" data-end=\"1999\">\r\n<p data-start=\"1909\" data-end=\"1999\">Solar PV arrays (string or combiner box protection, typically 1000 Vdc or 1500 Vdc).<\/p>\r\n<\/li>\r\n \t<li data-start=\"2000\" data-end=\"2084\">\r\n<p data-start=\"2002\" data-end=\"2084\">Battery Energy Storage Systems (BESS) for grid-scale or microgrid solutions.<\/p>\r\n<\/li>\r\n \t<li data-start=\"2085\" data-end=\"2162\">\r\n<p data-start=\"2087\" data-end=\"2162\">Electric Vehicle (EV) charging stations, especially DC fast charging.<\/p>\r\n<\/li>\r\n \t<li data-start=\"2163\" data-end=\"2261\">\r\n<p data-start=\"2165\" data-end=\"2261\">Telecom towers and renewable energy systems (wind turbine converters, hybrid DC networks).<\/p>\r\n<\/li>\r\n<\/ul>\r\n<h3 data-start=\"2263\" data-end=\"2304\">Examples from <span style=\"text-decoration: underline;\"><a href=\"https:\/\/www.britecelectric.com\/product-category\/dc-surge-protector\/\" target=\"_blank\" rel=\"noopener\">Britec\u2019s DC SPD<\/a><\/span> Range<\/h3>\r\n<ul data-start=\"2305\" data-end=\"2976\">\r\n \t<li data-start=\"2305\" data-end=\"2630\">\r\n<p data-start=\"2307\" data-end=\"2341\"><a href=\"https:\/\/www.britecelectric.com\/product\/brpv3-1000-20-1000v-20ka-t12-pv-surge-arrester\/\" target=\"_blank\" rel=\"noopener\"><em><strong data-start=\"2307\" data-end=\"2339\">BRPV3-1000 (Type 1+2 DC SPD)<\/strong><\/em><\/a><\/p>\r\n\r\n<ul data-start=\"2344\" data-end=\"2630\">\r\n \t<li data-start=\"2344\" data-end=\"2381\">\r\n<p data-start=\"2346\" data-end=\"2381\">Voltage rating: Uc = 1000 Vdc<\/p>\r\n<\/li>\r\n \t<li data-start=\"2384\" data-end=\"2429\">\r\n<p data-start=\"2386\" data-end=\"2429\">Nominal discharge current: In = 20 kA<\/p>\r\n<\/li>\r\n \t<li data-start=\"2432\" data-end=\"2489\">\r\n<p data-start=\"2434\" data-end=\"2489\">Maximum discharge current: Imax = 40 kA (8\/20 \u00b5s)<\/p>\r\n<\/li>\r\n \t<li data-start=\"2492\" data-end=\"2537\">\r\n<p data-start=\"2494\" data-end=\"2537\">Voltage protection level: Up \u2264 3.8 kV<\/p>\r\n<\/li>\r\n \t<li data-start=\"2540\" data-end=\"2630\">\r\n<p data-start=\"2542\" data-end=\"2630\">Features: Thermal disconnector + remote signaling for real-time monitoring.<\/p>\r\n<\/li>\r\n<\/ul>\r\n<\/li>\r\n \t<li data-start=\"2632\" data-end=\"2976\">\r\n<p data-start=\"2634\" data-end=\"2668\"><a href=\"https:\/\/www.britecelectric.com\/product\/brpv3-1500-12-5-t1t2-1500v-12-5ka-pv-surge-protection-device\/\" target=\"_blank\" rel=\"noopener\"><strong data-start=\"2634\" data-end=\"2666\">BRPV3-1500 (Type 1+2 DC SPD)<\/strong><\/a><\/p>\r\n\r\n<ul data-start=\"2671\" data-end=\"2976\">\r\n \t<li data-start=\"2671\" data-end=\"2708\">\r\n<p data-start=\"2673\" data-end=\"2708\">Voltage rating: Uc = 1500 Vdc<\/p>\r\n<\/li>\r\n \t<li data-start=\"2711\" data-end=\"2756\">\r\n<p data-start=\"2713\" data-end=\"2756\">Nominal discharge current: In = 20 kA<\/p>\r\n<\/li>\r\n \t<li data-start=\"2759\" data-end=\"2806\">\r\n<p data-start=\"2761\" data-end=\"2806\">Maximum discharge current: Imax = 40 kA<\/p>\r\n<\/li>\r\n \t<li data-start=\"2809\" data-end=\"2854\">\r\n<p data-start=\"2811\" data-end=\"2854\">Voltage protection level: Up \u2264 4.5 kV<\/p>\r\n<\/li>\r\n \t<li data-start=\"2857\" data-end=\"2976\">\r\n<p data-start=\"2859\" data-end=\"2976\">Features: Arc chamber design + thermal cut-off, ensuring reliable operation in PV plants and EV infrastructure.<\/p>\r\n<\/li>\r\n<\/ul>\r\n<\/li>\r\n<\/ul>\r\n<h2>4. What\u2019s the Difference Between AC and DC Surge Protection?<\/h2>\r\nAlthough AC SPDs and DC SPDs look similar at first glance, their design principles, standards, and application requirements are very different. The table below summarizes the key differences between AC SPD and DC SPD:\r\n<table style=\"width: 100%; height: 336px;\">\r\n<thead>\r\n<tr style=\"height: 24px;\">\r\n<th style=\"height: 24px;\"><strong>Parameter<\/strong><\/th>\r\n<th style=\"height: 24px;\"><strong>AC SPD<\/strong><\/th>\r\n<th style=\"height: 24px;\"><strong>DC SPD<\/strong><\/th>\r\n<\/tr>\r\n<\/thead>\r\n<tbody>\r\n<tr style=\"height: 48px;\">\r\n<td style=\"height: 48px;\"><strong>Voltage Range<\/strong><\/td>\r\n<td style=\"height: 48px;\">115V \u2013 690V AC (common grids) Example: BR-40 (Uc 275 V, In 20 kA)<\/td>\r\n<td style=\"height: 48px;\">500V \u2013 1500V DC (PV, EV, BESS) Example: BRPV3-1500 (Uc 1500 Vdc, In 20 kA)<\/td>\r\n<\/tr>\r\n<tr style=\"height: 24px;\">\r\n<td style=\"height: 24px;\"><strong>Polarity Handling<\/strong><\/td>\r\n<td style=\"height: 24px;\">Bi-directional operation (AC sine wave polarity switching)<\/td>\r\n<td style=\"height: 24px;\">Unidirectional MOV selection for DC polarity stability<\/td>\r\n<\/tr>\r\n<tr style=\"height: 48px;\">\r\n<td style=\"height: 48px;\"><strong>Arc Extinguishing<\/strong><\/td>\r\n<td style=\"height: 48px;\">Natural zero-crossing aids arc interruption Type 1 SPDs often use MOV + GDT\/arc chamber for 10\/350 \u00b5s impulses<\/td>\r\n<td style=\"height: 48px;\">No zero-crossing \u2192 requires fast thermal disconnector, arc chamber, or GDT<\/td>\r\n<\/tr>\r\n<tr style=\"height: 24px;\">\r\n<td style=\"height: 24px;\"><strong>Response Time<\/strong><\/td>\r\n<td style=\"height: 24px;\">MOV-based SPDs typically respond in &lt;25 ns (device-dependent)<\/td>\r\n<td style=\"height: 24px;\">Same principle \u2013 MOV-based, &lt;25 ns (device-dependent)<\/td>\r\n<\/tr>\r\n<tr style=\"height: 24px;\">\r\n<td style=\"height: 24px;\"><strong>Waveform Type<\/strong><\/td>\r\n<td style=\"height: 24px;\">Sinusoidal (50\/60 Hz)<\/td>\r\n<td style=\"height: 24px;\">Constant DC voltage<\/td>\r\n<\/tr>\r\n<tr style=\"height: 48px;\">\r\n<td style=\"height: 48px;\"><strong>Surge Test Waveforms<\/strong><\/td>\r\n<td style=\"height: 48px;\">8\/20 \u00b5s (switching), 10\/350 \u00b5s (lightning current, Type 1)<\/td>\r\n<td style=\"height: 48px;\">Standardized same as AC (8\/20 \u00b5s, 10\/350 \u00b5s); key difference = arc extinction<\/td>\r\n<\/tr>\r\n<tr style=\"height: 48px;\">\r\n<td style=\"height: 48px;\"><strong>Energy Handling<\/strong><\/td>\r\n<td style=\"height: 48px;\">Per-pole rating depends on design (check datasheet: In\/Imax\/Iimp) Example: <strong>BR-30FU (In 20 kA, Imax 40 kA)<\/strong><\/td>\r\n<td style=\"height: 48px;\">Per-pole rating depends on design (In\/Imax\/Iimp) Example: BRPV3-1000 (In 20 kA, Imax 40 kA)<\/td>\r\n<\/tr>\r\n<tr style=\"height: 24px;\">\r\n<td style=\"height: 24px;\"><strong>Standards<\/strong><\/td>\r\n<td style=\"height: 24px;\">IEC 61643-11 (AC SPDs), UL 1449 (North America)<\/td>\r\n<td style=\"height: 24px;\">IEC 61643-31 (DC SPDs, PV), UL 1449 (North America, PV \u22641500 Vdc)<\/td>\r\n<\/tr>\r\n<tr style=\"height: 24px;\">\r\n<td style=\"height: 24px;\"><strong>Applications<\/strong><\/td>\r\n<td style=\"height: 24px;\">Homes, offices, industrial control panels, building distribution boards<\/td>\r\n<td style=\"height: 24px;\">Solar PV arrays, battery storage, EV charging, telecom, wind turbines<\/td>\r\n<\/tr>\r\n<\/tbody>\r\n<\/table>\r\n<h3>4.1 Electrical Current Characteristics: AC vs. DC<\/h3>\r\nAC reverses direction periodically (sine wave), allowing natural zero-crossing points. DC flows in a single direction continuously (flat waveform), making arc extinguishing much more challenging.\r\n\r\n<strong>Implication:<\/strong>\r\n<blockquote>AC SPDs benefit from zero-crossing for arc interruption, while DC SPDs require more robust arc suppression mechanisms due to waveform characteristics.<\/blockquote>\r\n<h3>4.2 Surge Waveform<\/h3>\r\n<ul data-spread=\"false\">\r\n \t<li>AC surges often have smoother, sinusoidal waveforms.<\/li>\r\n \t<li>DC surges are shorter, faster, and more abrupt with flat top voltage<\/li>\r\n<\/ul>\r\n<strong>Response Time Needs:<\/strong>\r\n<blockquote>DC SPDs typically require faster response times (\u226425ns) to protect against rapid transients.<\/blockquote>\r\n<h3>4.3 Design and Operating Principles of SPDs<\/h3>\r\n<ul data-spread=\"false\">\r\n \t<li><strong>AC SPD:<\/strong> Designed for symmetrical voltage polarity and sine wave input<\/li>\r\n \t<li><strong>DC SPD:<\/strong> Built for polarity-sensitive circuits and unidirectional current flow<\/li>\r\n<\/ul>\r\n<strong>Technology Used: <\/strong>Both AC and DC SPD devices commonly use MOVs (metal oxide varistors), thermal disconnects, and sometimes GDTs (gas discharge tubes). To understand how these components function inside a surge protection device, see our detailed guide on <strong><em><a href=\"https:\/\/www.britecelectric.com\/blog\/how-does-spd-surge-protection-device-work\/\" target=\"_blank\" rel=\"noopener\">how an SPD works<\/a>.<\/em><\/strong>\r\n<h3>4.4 Voltage Ratings and Surge Capacity<\/h3>\r\n<ul data-spread=\"false\">\r\n \t<li>AC SPDs: Range from 115V to 600V<\/li>\r\n \t<li>DC SPDs: Range from 500V to 1500V<\/li>\r\n<\/ul>\r\n<strong>Example:<\/strong>\r\n<blockquote>DC SPD FLY1-40PV handles up to 40kA; AC SPD USP2 ranges up to 120kA, depending on the model.<\/blockquote>\r\n<h3>4.5 Application Environments<\/h3>\r\n<ul data-spread=\"false\">\r\n \t<li><strong>AC SPD:<\/strong> Offices, homes, HVAC, control panels<\/li>\r\n \t<li><strong>DC SPD:<\/strong> Renewable energy, outdoor telecom, transportation systems<\/li>\r\n<\/ul>\r\n<strong>Environmental Tolerance:<\/strong>\r\n<blockquote>DC SPDs usually support wider temperature ranges and relative humidity due to outdoor applications.<\/blockquote>\r\n<h3>4.6 Arc Extinguishing<\/h3>\r\n<ul data-spread=\"false\">\r\n \t<li><strong>AC:<\/strong> Arc naturally extinguishes at the zero-crossing<\/li>\r\n \t<li><strong>DC:<\/strong> Requires mechanical\/thermal arc quenching due to lack of polarity reversal.<\/li>\r\n<\/ul>\r\n<strong>Why It Matters:<\/strong>\r\n<blockquote>Inadequate arc suppression in DC surge arresters can lead to thermal runaway and fire.<\/blockquote>\r\n<h3>4.7 Standards, Testing, and Certification<\/h3>\r\n<ul data-spread=\"false\">\r\n \t<li><strong>AC SPD Standards:<\/strong> UL 1449, IEC 61643-11 (Type 1, 2, 3)<\/li>\r\n \t<li><strong>DC SPD Standards:<\/strong> EN 50539-11, IEC 61643-31, UL 1449 (PV, BESS, EV focus)<\/li>\r\n<\/ul>\r\n<strong>Example:<\/strong>\r\n<blockquote>Surge protection class must be verified via TUV-certified SPD labels for grid compliance.<\/blockquote>\r\n<h2>5. How to Choose the Right SPD<\/h2>\r\n<p data-start=\"408\" data-end=\"648\">Selecting the correct Surge Protective Device (SPD) is not only about voltage rating \u2013 it also involves installation position, protection coordination, and compliance with international standards. Here are the key factors to consider:<\/p>\r\n\r\n<h3 data-start=\"655\" data-end=\"700\">1. Match the SPD to Your System Voltage<\/h3>\r\n<ul data-start=\"701\" data-end=\"1201\">\r\n \t<li data-start=\"701\" data-end=\"930\">\r\n<p data-start=\"703\" data-end=\"744\"><strong data-start=\"703\" data-end=\"742\">AC systems (IEC 61643-11 \/ UL 1449)<\/strong><\/p>\r\n\r\n<ul data-start=\"747\" data-end=\"930\">\r\n \t<li data-start=\"747\" data-end=\"803\">\r\n<p data-start=\"749\" data-end=\"803\">230\/400 V (TN\/TT grids): Choose <strong data-start=\"781\" data-end=\"793\">Uc 275 V<\/strong> models.<\/p>\r\n<\/li>\r\n \t<li data-start=\"806\" data-end=\"930\">\r\n<p data-start=\"808\" data-end=\"930\">Example: Britec BR-40\/30FU \u2013 Type 2 SPD, Uc 275 V, In 20 kA, Imax 40 kA, with integrated fuse for backup protection.<\/p>\r\n<\/li>\r\n<\/ul>\r\n<\/li>\r\n \t<li data-start=\"931\" data-end=\"1201\">\r\n<p data-start=\"933\" data-end=\"987\"><strong data-start=\"933\" data-end=\"985\">PV DC systems (IEC 61643-31 \/ UL 1449 \u22641500 Vdc)<\/strong><\/p>\r\n\r\n<ul data-start=\"990\" data-end=\"1201\">\r\n \t<li data-start=\"990\" data-end=\"1062\">\r\n<p data-start=\"992\" data-end=\"1062\">600 Vdc, 1000 Vdc, or 1500 Vdc arrays: Select matching DC Uc rating.<\/p>\r\n<\/li>\r\n \t<li data-start=\"1065\" data-end=\"1201\">\r\n<p data-start=\"1067\" data-end=\"1201\">Example: <strong data-start=\"1076\" data-end=\"1111\">Britec BRPV3-1000 (Uc 1000 Vdc)<\/strong> or <strong data-start=\"1115\" data-end=\"1143\">BRPV3-1500 (Uc 1500 Vdc)<\/strong> \u2013 Type 1+2 DC SPDs for PV combiner boxes and inverters.<\/p>\r\n<\/li>\r\n<\/ul>\r\n<\/li>\r\n<\/ul>\r\n<p data-start=\"1203\" data-end=\"1342\"><strong data-start=\"1205\" data-end=\"1212\">Tip<\/strong>: Always check that the SPD\u2019s Uc (continuous operating voltage) is \u2265 1.2 \u00d7 nominal system voltage to avoid premature ageing.<\/p>\r\n\r\n<h3 data-start=\"1349\" data-end=\"1424\">2. Apply the Right Protection Class (Type) to Each Installation Level<\/h3>\r\n<ul data-start=\"1425\" data-end=\"2052\">\r\n \t<li data-start=\"1425\" data-end=\"1627\">\r\n<p data-start=\"1427\" data-end=\"1469\">Type 1 (10\/350 \u00b5s lightning current)<\/p>\r\n\r\n<ul data-start=\"1472\" data-end=\"1627\">\r\n \t<li data-start=\"1472\" data-end=\"1530\">\r\n<p data-start=\"1474\" data-end=\"1530\">Installed at service entrance \/ main distribution.<\/p>\r\n<\/li>\r\n \t<li data-start=\"1533\" data-end=\"1571\">\r\n<p data-start=\"1535\" data-end=\"1571\">Handles direct lightning currents.<\/p>\r\n<\/li>\r\n \t<li data-start=\"1574\" data-end=\"1627\">\r\n<p data-start=\"1576\" data-end=\"1627\">Example: <strong data-start=\"1585\" data-end=\"1610\">BR-12.5M Type 1+2 SPD<\/strong>, Iimp 12.5 kA.<\/p>\r\n<\/li>\r\n<\/ul>\r\n<\/li>\r\n \t<li data-start=\"1628\" data-end=\"1865\">\r\n<p data-start=\"1630\" data-end=\"1669\">Type 2 (8\/20 \u00b5s switching surges)<\/p>\r\n\r\n<ul data-start=\"1672\" data-end=\"1865\">\r\n \t<li data-start=\"1672\" data-end=\"1719\">\r\n<p data-start=\"1674\" data-end=\"1719\">Installed at floor distribution boards.<\/p>\r\n<\/li>\r\n \t<li data-start=\"1722\" data-end=\"1792\">\r\n<p data-start=\"1724\" data-end=\"1792\">Protects against switching surges and residual lightning currents.<\/p>\r\n<\/li>\r\n \t<li data-start=\"1795\" data-end=\"1865\">\r\n<p data-start=\"1797\" data-end=\"1865\">Example: <strong data-start=\"1806\" data-end=\"1831\">BR-40\/30FU Type 2 SPD<\/strong> (with integrated disconnector).<\/p>\r\n<\/li>\r\n<\/ul>\r\n<\/li>\r\n \t<li data-start=\"1866\" data-end=\"2052\">\r\n<p data-start=\"1868\" data-end=\"1895\">Type 3 (point-of-use)<\/p>\r\n\r\n<ul data-start=\"1898\" data-end=\"2052\">\r\n \t<li data-start=\"1898\" data-end=\"1983\">\r\n<p data-start=\"1900\" data-end=\"1983\">Installed close to sensitive equipment (computers, servers, medical devices).<\/p>\r\n<\/li>\r\n \t<li data-start=\"1986\" data-end=\"2052\">\r\n<p data-start=\"1988\" data-end=\"2052\">Protects against residual surges not clamped by upstream SPDs.<\/p>\r\n<\/li>\r\n<\/ul>\r\n<\/li>\r\n<\/ul>\r\n<p data-start=\"2054\" data-end=\"2204\"><strong data-start=\"2056\" data-end=\"2076\">Engineering rule<\/strong>: If the cable length between two protection stages is <strong data-start=\"2131\" data-end=\"2140\">&gt;<\/strong>10 m, install additional SPDs at both ends to ensure coordination.<\/p>\r\n\r\n<h3 data-start=\"2211\" data-end=\"2261\">3. Ensure Coordination With Breakers &amp; Fuses<\/h3>\r\n<ul data-start=\"2262\" data-end=\"2455\">\r\n \t<li data-start=\"2262\" data-end=\"2330\">\r\n<p data-start=\"2264\" data-end=\"2330\">SPDs must be coordinated with upstream MCB\/RCB\/backup fuses.<\/p>\r\n<\/li>\r\n \t<li data-start=\"2331\" data-end=\"2455\">\r\n<p data-start=\"2333\" data-end=\"2455\">Some models, like <strong data-start=\"2351\" data-end=\"2372\">Britec BR-40\/30FU<\/strong>, integrate thermal disconnectors and backup protection, reducing space and cost.<\/p>\r\n<\/li>\r\n<\/ul>\r\n<h3 data-start=\"2462\" data-end=\"2496\">4. Compliance With Standards<\/h3>\r\n<ul data-start=\"2497\" data-end=\"2605\">\r\n \t<li data-start=\"2497\" data-end=\"2543\">\r\n<p data-start=\"2499\" data-end=\"2543\"><strong data-start=\"2499\" data-end=\"2510\">AC SPDs<\/strong>: IEC 61643-11, UL 1449<\/p>\r\n<\/li>\r\n \t<li data-start=\"2544\" data-end=\"2605\">\r\n<p data-start=\"2546\" data-end=\"2605\"><strong data-start=\"2546\" data-end=\"2560\">PV DC SPDs<\/strong>: IEC 61643-31, UL 1449 (\u22641500 Vdc)<\/p>\r\n<\/li>\r\n<\/ul>\r\n<p data-start=\"2607\" data-end=\"2731\">Always ensure the SPD carries the proper CE, UL, or IEC test certifications, especially for international projects.<\/p>\r\n\r\n<h3 data-start=\"2738\" data-end=\"2756\">Key Takeaway<\/h3>\r\n<p data-start=\"2757\" data-end=\"2931\">Choosing the right SPD means matching the voltage, selecting the correct Type per installation level, ensuring proper coordination, and complying with IEC\/UL standards.<\/p>\r\n<p data-start=\"2933\" data-end=\"3142\">With <strong data-start=\"2938\" data-end=\"3007\">Britec\u2019s portfolio (BR-12.5M, BR-40\/30FU, BRPV3-1000, BRPV3-1500)<\/strong>, you can cover residential, commercial, industrial, and PV solar applications with certified, high-performance surge protection.<\/p>\r\n\r\n<h2>6. Conclusion<\/h2>\r\nAC and DC surge protection devices may look similar, but they serve fundamentally different systems. AC SPDs are optimized for sine wave applications in buildings and grids. DC SPDs are tailored for flat voltage waveforms in renewable and high-voltage DC infrastructures.\r\n\r\n<strong>Choosing the correct SPD is essential to safeguarding equipment and maintaining compliance with safety standards.<\/strong>\r\n\r\nTo ensure optimal protection:\r\n<ul data-spread=\"false\">\r\n \t<li>Always match the SPD type to the current system (AC or DC)<\/li>\r\n \t<li>Consider voltage rating, waveform characteristics, and required energy absorption capability.<\/li>\r\n \t<li>Choose certified products (TUV, UL, CE) with appropriate surge protection class ratings.<\/li>\r\n<\/ul>\r\n<a href=\"https:\/\/www.britecelectric.com\/contact-us\/\" target=\"_blank\" rel=\"noopener\"><strong>Need help selecting your SPD?<\/strong> Contact a certified electrical professional or surge protection provider to find the right DC surge protection or AC surge protection solution for your system.<\/a>"},"_links":{"self":[{"href":"https:\/\/www.britecelectric.com\/pt\/wp-json\/wp\/v2\/blog\/2112","targetHints":{"allow":["GET"]}}],"collection":[{"href":"https:\/\/www.britecelectric.com\/pt\/wp-json\/wp\/v2\/blog"}],"about":[{"href":"https:\/\/www.britecelectric.com\/pt\/wp-json\/wp\/v2\/types\/blog"}],"wp:featuredmedia":[{"embeddable":true,"href":"https:\/\/www.britecelectric.com\/pt\/wp-json\/wp\/v2\/media\/2114"}],"wp:attachment":[{"href":"https:\/\/www.britecelectric.com\/pt\/wp-json\/wp\/v2\/media?parent=2112"}],"wp:term":[{"taxonomy":"blog_category","embeddable":true,"href":"https:\/\/www.britecelectric.com\/pt\/wp-json\/wp\/v2\/blog_category?post=2112"}],"curies":[{"name":"wp","href":"https:\/\/api.w.org\/{rel}","templated":true}]}}