{"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\/es\/blog\/ac-vs-dc-surge-protection-whats-the-difference\/","title":{"rendered":"AC vs. DC Surge Protection: What&#8217;s the Difference?"},"content":{"rendered":"La protecci\u00f3n contra sobretensiones es fundamental para la seguridad y el tiempo de actividad de los sistemas el\u00e9ctricos modernos. Elegir lo correcto <a href=\"https:\/\/www.britecelectric.com\/es\/products\/\" target=\"_blank\" rel=\"noopener\"><strong data-start=\"1300\" data-end=\"1333\">Dispositivo de protecci\u00f3n contra sobretensiones (SPD)<\/strong><\/a> comienza con la comprensi\u00f3n de c\u00f3mo los sistemas de CA y CC se comportan de manera diferente bajo transitorios, especialmente la extinci\u00f3n del arco (cruce por cero de CA versus sin cruce de CC) y el dise\u00f1o de componentes (MOV bidireccionales versus unidireccionales). Esta gu\u00eda explica la diferencia entre el SPD de CA y el SPD de CC, mapea los est\u00e1ndares IEC\/UL que se aplican y muestra c\u00f3mo seleccionar un SPD que satisfaga sus necesidades de aplicaci\u00f3n y cumplimiento.\r\n<h2>1. Introducci\u00f3n<\/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>, un SPD limita la sobretensi\u00f3n y desv\u00eda la sobretensi\u00f3n en nanosegundos, protegiendo los equipos posteriores.\r\n<h2>2. \u00bfQu\u00e9 es la protecci\u00f3n contra sobretensiones de CA?<\/h2>\r\n<a href=\"https:\/\/www.britecelectric.com\/es\/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\/es\/product-category\/ac-power-surge-protection\/\" target=\"_blank\" rel=\"noopener\"><em><strong data-start=\"218\" data-end=\"241\">Protecci\u00f3n contra sobretensiones de CA<\/strong><\/em><\/a> est\u00e1 dise\u00f1ado para sistemas el\u00e9ctricos donde el voltaje alterna de direcci\u00f3n peri\u00f3dicamente, generalmente a 50 Hz o 60 Hz. Estos sistemas se utilizan ampliamente en viviendas residenciales, edificios comerciales, f\u00e1bricas y redes de automatizaci\u00f3n industrial. De acuerdo a <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>, Los SPD de CA se clasifican en Tipo 1, Tipo 2 y Tipo 3, cada uno destinado a un punto de instalaci\u00f3n diferente dentro del sistema de distribuci\u00f3n.\r\n<h3 data-start=\"652\" data-end=\"688\">Caracter\u00edsticas clave de los SPD de CA<\/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 dentro de voltajes de red comunes, como 115 V, 230 V, 400 V y hasta 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\">Operaci\u00f3n bidireccional para manejar la conmutaci\u00f3n de polaridad de ondas sinusoidales de CA.<\/p>\r\n<\/li>\r\n \t<li data-start=\"858\" data-end=\"983\">\r\n<p data-start=\"860\" data-end=\"983\">Extinci\u00f3n del arco mediante cruces por cero naturales de la forma de onda de CA, lo que hace que la desconexi\u00f3n sea m\u00e1s segura y eficiente.<\/p>\r\n<\/li>\r\n \t<li data-start=\"984\" data-end=\"1220\">\r\n<p data-start=\"986\" data-end=\"1220\">MOV (varistores de \u00f3xido met\u00e1lico) de uso com\u00fan para absorber sobretensiones; En los SPD de tipo 1, los MOV suelen combinarse con GDT (tubos de descarga de gas) o c\u00e1maras de arco para soportar impulsos de rayos de alta energ\u00eda (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\">Se requiere coordinaci\u00f3n con la protecci\u00f3n aguas arriba (MCB o fusible); La mejor pr\u00e1ctica es mantener la longitud del cable del SPD lo m\u00e1s corta posible, idealmente &lt;0,5 m, para minimizar el voltaje residual.<\/p>\r\n<\/li>\r\n<\/ul>\r\n<blockquote>\r\n<h3 data-start=\"1412\" data-end=\"1447\">Tipos de SPD para aplicaciones de CA<\/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\">SPD tipo 1<\/strong> \u2013 Instalado en la entrada de servicio; Resiste corrientes directas de rayo (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\">SPD tipo 2<\/strong> \u2013 Instalado en cuadros de distribuci\u00f3n; protege contra sobretensiones de conmutaci\u00f3n y rayos indirectos (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\">SPD tipo 3<\/strong> \u2013 Instalado cerca de equipos sensibles; Proporciona una excelente protecci\u00f3n contra sobretensiones residuales.<\/p>\r\n<\/li>\r\n<\/ul>\r\n<h3 data-start=\"1802\" data-end=\"1828\">Aplicaciones 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\">Placas de entrada de servicio principales (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\">Cuadros de distribuci\u00f3n de edificios (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\">Cuadros de control en entornos industriales (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\">Protecci\u00f3n en el punto de uso o a nivel de enchufe para dispositivos sensibles alimentados por CA (Tipo 3)<\/p>\r\n<\/li>\r\n<\/ul>\r\n<h3 data-start=\"2055\" data-end=\"2094\">Ejemplo de <span style=\"text-decoration: underline;\"><a href=\"https:\/\/www.britecelectric.com\/es\/product-category\/ac-power-surge-protection\/\" target=\"_blank\" rel=\"noopener\"><strong><em>Producto SPD de CA Britec<\/em><\/strong><\/a> <\/span>Rango<\/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>: Clasificado para Uc 275\/320\/440 V, con Iimp hasta 25 kA (10\/350 \u00b5s); Ideal para protecci\u00f3n contra rayos en entradas de servicio en 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>: Maneja tanto impulsos de rayo como sobretensiones de conmutaci\u00f3n, lo que lo hace adecuado para instalaciones industriales.<\/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 y BR-30FU (Tipo 2)<\/strong>: Clasificado para Uc 275 V, con In 20 kA \/ Imax 40 kA (8\/20 \u00b5s); El BR-30FU integra un fusible de respaldo, lo que simplifica la instalaci\u00f3n y mejora la seguridad.<\/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>: Dise\u00f1ado para protecci\u00f3n de equipos terminales, con baja tensi\u00f3n residual (Hasta \u2264 1,5 kV).<\/p>\r\n<\/li>\r\n<\/ul>\r\n<\/blockquote>\r\n<h2>3. \u00bfQu\u00e9 es la protecci\u00f3n contra sobretensiones de CC?<\/h2>\r\n<a href=\"https:\/\/www.britecelectric.com\/es\/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 protecci\u00f3n contra sobretensiones de CC\" width=\"600\" height=\"600\" \/><\/a>\r\n\r\n<em><a href=\"https:\/\/www.britecelectric.com\/es\/product-category\/dc-surge-protector\/\" target=\"_blank\" rel=\"noopener\"><strong data-start=\"361\" data-end=\"384\">Protecci\u00f3n contra sobretensiones CC<\/strong><\/a><\/em> est\u00e1 dise\u00f1ado para sistemas de corriente continua, donde la electricidad fluye en una sola direcci\u00f3n sin cruces por cero naturales. A diferencia de los sistemas de CA que se benefician de las inversiones peri\u00f3dicas de voltaje, los sistemas de CC presentan un desaf\u00edo de ingenier\u00eda \u00fanico: los arcos no se autoextinguen. Esto significa que los SPD de CC requieren mecanismos de extinci\u00f3n de arco, desconexi\u00f3n t\u00e9rmica y liberaci\u00f3n mec\u00e1nica m\u00e1s robustos para garantizar la seguridad y evitar la fuga t\u00e9rmica.\r\n<h3 data-start=\"820\" data-end=\"849\">Caracter\u00edsticas clave de los SPD de CC<\/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\">Clasificaciones de voltaje<\/strong>: Normalmente dise\u00f1ado para 500 V CC a 1500 V CC, y cubre paneles solares fotovoltaicos, sistemas de almacenamiento de bater\u00edas (BESS) y redes de carga r\u00e1pida de 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\">Selecci\u00f3n MOV unidireccional<\/strong>: Para adaptarse a la polaridad de CC, los SPD de CC utilizan MOV unidireccionales, lo que garantiza una sujeci\u00f3n de sobretensiones correcta para el flujo de corriente unidireccional.<\/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\">Supresi\u00f3n de arco<\/strong>: Debido a que la CC carece de un cruce por cero, los SPD de CC integran desconexiones t\u00e9rmicas de acci\u00f3n r\u00e1pida, tubos de descarga de gas (GDT) o c\u00e1maras de arco para interrumpir de forma segura las corrientes de falla.<\/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\">Manejo de altas sobretensiones<\/strong>: Construidos para absorber sobretensiones de alta energ\u00eda con clasificaciones In\/Imax de hasta 20\u201340 kA (8\/20 \u00b5s) y dispositivos Tipo 1+2 clasificados para impulsos de rayos Iimpact.<\/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\">Cumplimiento y Certificaci\u00f3n<\/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\">Debe cumplir con IEC 61643-31 (para SPD PV CC) o <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 en Norteam\u00e9rica, hasta 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\">Dependiendo del proyecto o de los requisitos regionales, los productos pueden contar con certificaciones T\u00dcV, CB o UL adicionales para auditor\u00edas de seguridad y cumplimiento de la red.<\/p>\r\n<\/li>\r\n<\/ul>\r\n<\/li>\r\n<\/ul>\r\n<h3 data-start=\"1857\" data-end=\"1906\">Aplicaciones t\u00edpicas de protecci\u00f3n contra sobretensiones de 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\">Conjuntos solares fotovoltaicos (protecci\u00f3n de cadena o caja combinadora, normalmente 1000 V CC o 1500 V CC).<\/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 almacenamiento de energ\u00eda en bater\u00edas (BESS) para soluciones a escala de red o microrredes.<\/p>\r\n<\/li>\r\n \t<li data-start=\"2085\" data-end=\"2162\">\r\n<p data-start=\"2087\" data-end=\"2162\">Estaciones de carga de veh\u00edculos el\u00e9ctricos (EV), especialmente carga r\u00e1pida CC.<\/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 telecomunicaciones y sistemas de energ\u00edas renovables (convertidores de turbinas e\u00f3licas, redes h\u00edbridas de CC).<\/p>\r\n<\/li>\r\n<\/ul>\r\n<h3 data-start=\"2263\" data-end=\"2304\">Ejemplos de <span style=\"text-decoration: underline;\"><a href=\"https:\/\/www.britecelectric.com\/es\/product-category\/dc-surge-protector\/\" target=\"_blank\" rel=\"noopener\">SPD DC de Britec<\/a><\/span> Rango<\/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\/es\/product\/brpv3-1000-20-1000v-20ka-t12-pv-surge-arrester\/\" target=\"_blank\" rel=\"noopener\"><em><strong data-start=\"2307\" data-end=\"2339\">BRPV3-1000 (SPD CC tipo 1+2)<\/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\">Clasificaci\u00f3n de voltaje: 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\">Corriente nominal de descarga: 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\">Corriente 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\">Nivel de protecci\u00f3n de voltaje: Hasta \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: Desconector t\u00e9rmico + se\u00f1alizaci\u00f3n remota para seguimiento en tiempo 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\/es\/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 (SPD de CC tipo 1+2)<\/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\">Clasificaci\u00f3n de voltaje: 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\">Corriente nominal de descarga: 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\">Corriente 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\">Nivel de protecci\u00f3n de voltaje: Hasta \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: Dise\u00f1o de c\u00e1mara de arco + corte t\u00e9rmico, lo que garantiza un funcionamiento confiable en plantas fotovoltaicas e infraestructura de veh\u00edculos el\u00e9ctricos.<\/p>\r\n<\/li>\r\n<\/ul>\r\n<\/li>\r\n<\/ul>\r\n<h2>4. \u00bfCu\u00e1l es la diferencia entre la protecci\u00f3n contra sobretensiones de CA y CC?<\/h2>\r\nAunque los SPD de CA y CC parecen similares a primera vista, sus principios de dise\u00f1o, est\u00e1ndares y requisitos de aplicaci\u00f3n son muy diferentes. La siguiente tabla resume las diferencias clave entre AC SPD y 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\u00e1metro<\/strong><\/th>\r\n<th style=\"height: 24px;\"><strong>SPD de CA<\/strong><\/th>\r\n<th style=\"height: 24px;\"><strong>SPD CC<\/strong><\/th>\r\n<\/tr>\r\n<\/thead>\r\n<tbody>\r\n<tr style=\"height: 48px;\">\r\n<td style=\"height: 48px;\"><strong>Rango de voltaje<\/strong><\/td>\r\n<td style=\"height: 48px;\">115V \u2013 690V AC (redes comunes) Ejemplo: BR-40 (Uc 275 V, In 20 kA)<\/td>\r\n<td style=\"height: 48px;\">500 V \u2013 1500 V CC (PV, EV, BESS) Ejemplo: BRPV3-1500 (Uc 1500 V CC, entrada 20 kA)<\/td>\r\n<\/tr>\r\n<tr style=\"height: 24px;\">\r\n<td style=\"height: 24px;\"><strong>Manejo de polaridad<\/strong><\/td>\r\n<td style=\"height: 24px;\">Operaci\u00f3n bidireccional (conmutaci\u00f3n de polaridad de onda sinusoidal de CA)<\/td>\r\n<td style=\"height: 24px;\">Selecci\u00f3n MOV unidireccional para estabilidad de polaridad CC<\/td>\r\n<\/tr>\r\n<tr style=\"height: 48px;\">\r\n<td style=\"height: 48px;\"><strong>Extinci\u00f3n de arco<\/strong><\/td>\r\n<td style=\"height: 48px;\">El cruce por cero natural ayuda a la interrupci\u00f3n del arco. Los SPD tipo 1 suelen utilizar MOV + GDT\/c\u00e1mara de arco para impulsos de 10\/350 \u00b5s.<\/td>\r\n<td style=\"height: 48px;\">Sin cruce por cero \u2192 requiere un seccionador t\u00e9rmico r\u00e1pido, una c\u00e1mara de arco o GDT<\/td>\r\n<\/tr>\r\n<tr style=\"height: 24px;\">\r\n<td style=\"height: 24px;\"><strong>Tiempo de respuesta<\/strong><\/td>\r\n<td style=\"height: 24px;\">Los SPD basados \u200b\u200ben MOV normalmente responden en &lt;25 ns (dependiendo del dispositivo)<\/td>\r\n<td style=\"height: 24px;\">Mismo principio: basado en MOV, &lt;25 ns (depende del 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;\">Sinusoidal (50\/60 Hz)<\/td>\r\n<td style=\"height: 24px;\">Voltaje CC constante<\/td>\r\n<\/tr>\r\n<tr style=\"height: 48px;\">\r\n<td style=\"height: 48px;\"><strong>Formas de onda de prueba de sobretensi\u00f3n<\/strong><\/td>\r\n<td style=\"height: 48px;\">8\/20 \u00b5s (conmutaci\u00f3n), 10\/350 \u00b5s (corriente de rayo, Tipo 1)<\/td>\r\n<td style=\"height: 48px;\">Estandarizado igual que AC (8\/20 \u00b5s, 10\/350 \u00b5s); diferencia clave = extinci\u00f3n del arco<\/td>\r\n<\/tr>\r\n<tr style=\"height: 48px;\">\r\n<td style=\"height: 48px;\"><strong>Manejo de energ\u00eda<\/strong><\/td>\r\n<td style=\"height: 48px;\">La clasificaci\u00f3n por polo depende del dise\u00f1o (consulte la hoja de datos: In\/Imax\/Iimp) Ejemplo: <strong>BR-30FU (En 20 kA, Im\u00e1x 40 kA)<\/strong><\/td>\r\n<td style=\"height: 48px;\">La clasificaci\u00f3n por polo depende del dise\u00f1o (In\/Imax\/Iimp) Ejemplo: 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>Est\u00e1ndares<\/strong><\/td>\r\n<td style=\"height: 24px;\">IEC 61643-11 (SPD de CA), UL 1449 (Norteam\u00e9rica)<\/td>\r\n<td style=\"height: 24px;\">IEC 61643-31 (SPD de CC, fotovoltaico), UL 1449 (Norteam\u00e9rica, fotovoltaico \u22641500 Vcc)<\/td>\r\n<\/tr>\r\n<tr style=\"height: 24px;\">\r\n<td style=\"height: 24px;\"><strong>Aplicaciones<\/strong><\/td>\r\n<td style=\"height: 24px;\">Hogares, oficinas, paneles de control industriales, tableros de distribuci\u00f3n de edificios.<\/td>\r\n<td style=\"height: 24px;\">Paneles solares fotovoltaicos, almacenamiento de bater\u00edas, carga de veh\u00edculos el\u00e9ctricos, telecomunicaciones, turbinas e\u00f3licas<\/td>\r\n<\/tr>\r\n<\/tbody>\r\n<\/table>\r\n<h3>4.1 Caracter\u00edsticas de la corriente el\u00e9ctrica: CA versus CC<\/h3>\r\nLa CA invierte la direcci\u00f3n peri\u00f3dicamente (onda sinusoidal), lo que permite puntos de cruce por cero naturales. La CC fluye continuamente en una sola direcci\u00f3n (forma de onda plana), lo que hace que la extinci\u00f3n del arco sea mucho m\u00e1s desafiante.\r\n\r\n<strong>Implicaci\u00f3n:<\/strong>\r\n<blockquote>Los DPS de CA se benefician del cruce por cero para la interrupci\u00f3n del arco, mientras que los DPS de CC requieren mecanismos de supresi\u00f3n de arco m\u00e1s robustos debido a las caracter\u00edsticas de la forma de onda.<\/blockquote>\r\n<h3>4.2 Forma de onda de sobretensi\u00f3n<\/h3>\r\n<ul data-spread=\"false\">\r\n \t<li>Las sobretensiones de CA suelen tener formas de onda sinusoidales m\u00e1s suaves.<\/li>\r\n \t<li>Las sobretensiones de CC son m\u00e1s cortas, m\u00e1s r\u00e1pidas y m\u00e1s abruptas con un voltaje superior plano<\/li>\r\n<\/ul>\r\n<strong>Necesidades de tiempo de respuesta:<\/strong>\r\n<blockquote>Los SPD de CC normalmente requieren tiempos de respuesta m\u00e1s r\u00e1pidos (\u226425 ns) para proteger contra transitorios r\u00e1pidos.<\/blockquote>\r\n<h3>4.3 Principios de dise\u00f1o y funcionamiento de los SPD<\/h3>\r\n<ul data-spread=\"false\">\r\n \t<li><strong>VELOCIDAD CA:<\/strong> Dise\u00f1ado para polaridad de voltaje sim\u00e9trica y entrada de onda sinusoidal<\/li>\r\n \t<li><strong>SPD CC:<\/strong> Construido para circuitos sensibles a la polaridad y flujo de corriente unidireccional<\/li>\r\n<\/ul>\r\n<strong>Tecnolog\u00eda utilizada: <\/strong>Tanto los dispositivos SPD de CA como de CC suelen utilizar MOV (varistores de \u00f3xido met\u00e1lico), desconexiones t\u00e9rmicas y, a veces, GDT (tubos de descarga de gas). Para comprender c\u00f3mo funcionan estos componentes dentro de un dispositivo de protecci\u00f3n contra sobretensiones, consulte nuestra gu\u00eda detallada sobre <strong><em><a href=\"https:\/\/www.britecelectric.com\/es\/blog\/how-does-spd-surge-protection-device-work\/\" target=\"_blank\" rel=\"noopener\">c\u00f3mo funciona un SPD<\/a>.<\/em><\/strong>\r\n<h3>4.4 Clasificaciones de voltaje y capacidad de sobretensi\u00f3n<\/h3>\r\n<ul data-spread=\"false\">\r\n \t<li>SPD de CA: rango de 115 V a 600 V<\/li>\r\n \t<li>SPD de CC: rango de 500 V a 1500 V<\/li>\r\n<\/ul>\r\n<strong>Ejemplo:<\/strong>\r\n<blockquote>DC SPD FLY1-40PV maneja hasta 40kA; AC SPD USP2 var\u00eda hasta 120kA, seg\u00fan el modelo.<\/blockquote>\r\n<h3>4.5 Entornos de aplicaci\u00f3n<\/h3>\r\n<ul data-spread=\"false\">\r\n \t<li><strong>VELOCIDAD CA:<\/strong> Oficinas, hogares, HVAC, paneles de control.<\/li>\r\n \t<li><strong>SPD CC:<\/strong> Energ\u00edas renovables, telecomunicaciones exteriores, sistemas de transporte.<\/li>\r\n<\/ul>\r\n<strong>Tolerancia ambiental:<\/strong>\r\n<blockquote>Los SPD de CC suelen admitir rangos de temperatura y humedad relativa m\u00e1s amplios debido a aplicaciones en exteriores.<\/blockquote>\r\n<h3>4.6 Extinci\u00f3n de arco<\/h3>\r\n<ul data-spread=\"false\">\r\n \t<li><strong>C.A:<\/strong> El arco se extingue naturalmente en el cruce por cero.<\/li>\r\n \t<li><strong>CORRIENTE CONTINUA:<\/strong> Requiere extinci\u00f3n mec\u00e1nica\/t\u00e9rmica del arco debido a la falta de inversi\u00f3n de polaridad.<\/li>\r\n<\/ul>\r\n<strong>Por qu\u00e9 es importante:<\/strong>\r\n<blockquote>Una supresi\u00f3n inadecuada del arco en los descargadores de sobretensiones de CC puede provocar fugas t\u00e9rmicas e incendios.<\/blockquote>\r\n<h3>4.7 Est\u00e1ndares, pruebas y certificaci\u00f3n<\/h3>\r\n<ul data-spread=\"false\">\r\n \t<li><strong>Est\u00e1ndares de SPD de CA:<\/strong> UL 1449, IEC 61643-11 (Tipo 1, 2, 3)<\/li>\r\n \t<li><strong>Est\u00e1ndares de SPD de CC:<\/strong> EN 50539-11, IEC 61643-31, UL 1449 (enfoque fotovoltaico, BESS, EV)<\/li>\r\n<\/ul>\r\n<strong>Ejemplo:<\/strong>\r\n<blockquote>La clase de protecci\u00f3n contra sobretensiones debe verificarse mediante etiquetas SPD certificadas por TUV para cumplir con la red.<\/blockquote>\r\n<h2>5. C\u00f3mo elegir el SPD adecuado<\/h2>\r\n<p data-start=\"408\" data-end=\"648\">Seleccionar el dispositivo de protecci\u00f3n contra sobretensiones (SPD) correcto no se trata solo de la clasificaci\u00f3n de voltaje, sino que tambi\u00e9n implica la posici\u00f3n de instalaci\u00f3n, la coordinaci\u00f3n de la protecci\u00f3n y el cumplimiento de los est\u00e1ndares internacionales. Estos son los factores clave a considerar:<\/p>\r\n\r\n<h3 data-start=\"655\" data-end=\"700\">1. Haga coincidir el SPD con el voltaje de su 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 de 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): Elegir <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\">Ejemplo: Britec BR-40\/30FU \u2013 SPD tipo 2, Uc 275 V, In 20 kA, Imax 40 kA, con fusible integrado para protecci\u00f3n de respaldo.<\/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\">Conjuntos de 600 VCC, 1000 VCC o 1500 VCC: seleccione la clasificaci\u00f3n DC Uc correspondiente.<\/p>\r\n<\/li>\r\n \t<li data-start=\"1065\" data-end=\"1201\">\r\n<p data-start=\"1067\" data-end=\"1201\">Ejemplo: <strong data-start=\"1076\" data-end=\"1111\">Britec BRPV3-1000 (Uc 1000 Vcc)<\/strong> o <strong data-start=\"1115\" data-end=\"1143\">BRPV3-1500 (Uc 1500 Vcc)<\/strong> \u2013 SPD CC tipo 1+2 para inversores y cajas combinadoras fotovoltaicas.<\/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\">Consejo<\/strong>: Siempre verifique que el Uc (voltaje de funcionamiento continuo) del SPD sea \u2265 1,2 \u00d7 voltaje nominal del sistema para evitar el envejecimiento prematuro.<\/p>\r\n\r\n<h3 data-start=\"1349\" data-end=\"1424\">2. Aplique la clase (tipo) de protecci\u00f3n adecuada a cada nivel de instalaci\u00f3n<\/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 (corriente de rayo 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 en entrada de servicio\/distribuci\u00f3n principal.<\/p>\r\n<\/li>\r\n \t<li data-start=\"1533\" data-end=\"1571\">\r\n<p data-start=\"1535\" data-end=\"1571\">Maneja corrientes directas de rayo.<\/p>\r\n<\/li>\r\n \t<li data-start=\"1574\" data-end=\"1627\">\r\n<p data-start=\"1576\" data-end=\"1627\">Ejemplo: <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 (sobretensiones de conmutaci\u00f3n 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 en tableros de distribuci\u00f3n 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 sobretensiones de maniobra y corrientes residuales de rayo.<\/p>\r\n<\/li>\r\n \t<li data-start=\"1795\" data-end=\"1865\">\r\n<p data-start=\"1797\" data-end=\"1865\">Ejemplo: <strong data-start=\"1806\" data-end=\"1831\">BR-40\/30FU Tipo 2 SPD<\/strong> (con 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 (punto 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 cerca de equipos sensibles (computadoras, 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 sobretensiones residuales no limitadas por los SPD aguas arriba.<\/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\">regla de ingenier\u00eda<\/strong>: Si la longitud del cable entre dos etapas de protecci\u00f3n es <strong data-start=\"2131\" data-end=\"2140\">&gt;<\/strong>10 m, instale SPD adicionales en ambos extremos para garantizar la coordinaci\u00f3n.<\/p>\r\n\r\n<h3 data-start=\"2211\" data-end=\"2261\">3. Garantizar la coordinaci\u00f3n con disyuntores y fusibles<\/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\">Los SPD deben coordinarse con MCB\/RCB\/fusibles de respaldo aguas arriba.<\/p>\r\n<\/li>\r\n \t<li data-start=\"2331\" data-end=\"2455\">\r\n<p data-start=\"2333\" data-end=\"2455\">Algunos modelos, como <strong data-start=\"2351\" data-end=\"2372\">Britec BR-40\/30FU<\/strong>, integran seccionadores t\u00e9rmicos y protecci\u00f3n de respaldo, reduciendo espacio y costo.<\/p>\r\n<\/li>\r\n<\/ul>\r\n<h3 data-start=\"2462\" data-end=\"2496\">4. Cumplimiento de las normas<\/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\">SPD de 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\">SPD 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\">Aseg\u00farese siempre de que el SPD cuente con las certificaciones de prueba CE, UL o IEC adecuadas, especialmente para proyectos internacionales.<\/p>\r\n\r\n<h3 data-start=\"2738\" data-end=\"2756\">Conclusi\u00f3n clave<\/h3>\r\n<p data-start=\"2757\" data-end=\"2931\">Elegir el SPD correcto significa hacer coincidir el voltaje, seleccionar el tipo correcto por nivel de instalaci\u00f3n, garantizar una coordinaci\u00f3n adecuada y cumplir con los est\u00e1ndares IEC\/UL.<\/p>\r\n<p data-start=\"2933\" data-end=\"3142\">Con <strong data-start=\"2938\" data-end=\"3007\">Cartera de Britec (BR-12.5M, BR-40\/30FU, BRPV3-1000, BRPV3-1500)<\/strong>, puede cubrir aplicaciones solares residenciales, comerciales, industriales y fotovoltaicas con protecci\u00f3n contra sobretensiones certificada de alto rendimiento.<\/p>\r\n\r\n<h2>6. Conclusi\u00f3n<\/h2>\r\nLos dispositivos de protecci\u00f3n contra sobretensiones de CA y CC pueden parecer similares, pero sirven para sistemas fundamentalmente diferentes. Los SPD de CA est\u00e1n optimizados para aplicaciones de onda sinusoidal en edificios y redes. Los SPD de CC est\u00e1n dise\u00f1ados para formas de onda de voltaje plano en infraestructuras de CC renovables y de alto voltaje.\r\n\r\n<strong>Elegir el SPD correcto es esencial para proteger el equipo y mantener el cumplimiento de las normas de seguridad.<\/strong>\r\n\r\nPara garantizar una protecci\u00f3n \u00f3ptima:\r\n<ul data-spread=\"false\">\r\n \t<li>Siempre haga coincidir el tipo de SPD con el sistema actual (CA o CC)<\/li>\r\n \t<li>Considere la clasificaci\u00f3n de voltaje, las caracter\u00edsticas de la forma de onda y la capacidad de absorci\u00f3n de energ\u00eda requerida.<\/li>\r\n \t<li>Elija productos certificados (TUV, UL, CE) con clasificaciones de clase de protecci\u00f3n contra sobretensiones adecuadas.<\/li>\r\n<\/ul>\r\n<a href=\"https:\/\/www.britecelectric.com\/es\/contact-us\/\" target=\"_blank\" rel=\"noopener\"><strong>\u00bfNecesita ayuda para seleccionar su SPD?<\/strong> Comun\u00edquese con un profesional el\u00e9ctrico certificado o un proveedor de protecci\u00f3n contra sobretensiones para encontrar la soluci\u00f3n de protecci\u00f3n contra sobretensiones de CC o CA adecuada para su 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\/es\/wp-json\/wp\/v2\/blog\/2112","targetHints":{"allow":["GET"]}}],"collection":[{"href":"https:\/\/www.britecelectric.com\/es\/wp-json\/wp\/v2\/blog"}],"about":[{"href":"https:\/\/www.britecelectric.com\/es\/wp-json\/wp\/v2\/types\/blog"}],"wp:featuredmedia":[{"embeddable":true,"href":"https:\/\/www.britecelectric.com\/es\/wp-json\/wp\/v2\/media\/2114"}],"wp:attachment":[{"href":"https:\/\/www.britecelectric.com\/es\/wp-json\/wp\/v2\/media?parent=2112"}],"wp:term":[{"taxonomy":"blog_category","embeddable":true,"href":"https:\/\/www.britecelectric.com\/es\/wp-json\/wp\/v2\/blog_category?post=2112"}],"curies":[{"name":"wp","href":"https:\/\/api.w.org\/{rel}","templated":true}]}}