{"id":2176,"date":"2025-08-26T10:11:09","date_gmt":"2025-08-26T02:11:09","guid":{"rendered":"https:\/\/www.britecelectric.com\/?post_type=blog&#038;p=2176"},"modified":"2025-08-26T10:16:08","modified_gmt":"2025-08-26T02:16:08","slug":"how-to-choose-single-phase-surge-protection-device","status":"publish","type":"blog","link":"https:\/\/www.britecelectric.com\/es\/blog\/how-to-choose-single-phase-surge-protection-device\/","title":{"rendered":"\u00bfC\u00f3mo elegir un dispositivo de protecci\u00f3n contra sobretensiones monof\u00e1sico?"},"content":{"rendered":"<h2 data-start=\"474\" data-end=\"492\">Introducci\u00f3n<\/h2>\r\n<p data-start=\"493\" data-end=\"937\">Las sobretensiones son una de las amenazas m\u00e1s subestimadas en los sistemas el\u00e9ctricos. Una sobretensi\u00f3n repentina, ya sea causada por un rayo, un cambio de red o incluso un equipo interno, puede degradar el aislamiento, disparar disyuntores o destruir dispositivos sensibles en un instante. Un dispositivo de protecci\u00f3n contra sobretensiones (SPD) monof\u00e1sico es la primera l\u00ednea de defensa. Desv\u00eda el exceso de energ\u00eda a tierra y garantiza que el voltaje que llega a su equipo se mantenga dentro de l\u00edmites seguros.<\/p>\r\n<p data-start=\"939\" data-end=\"1244\">Para los ingenieros el\u00e9ctricos y especialistas en adquisiciones, el desaf\u00edo no es si utilizar un SPD monof\u00e1sico, sino c\u00f3mo elegir el correcto. Esta gu\u00eda proporciona un enfoque claro, t\u00e9cnico y pr\u00e1ctico que combina est\u00e1ndares internacionales, mejores pr\u00e1cticas de ingenier\u00eda y experiencia del mundo real.<\/p>\r\n\r\n<h2 data-start=\"1251\" data-end=\"1304\">\u00bfQu\u00e9 es un dispositivo de protecci\u00f3n contra sobretensiones monof\u00e1sico?<\/h2>\r\n<p data-start=\"1305\" data-end=\"1604\">Se instala un dispositivo de protecci\u00f3n contra sobretensiones monof\u00e1sico en sistemas de CA monof\u00e1sicos de 230\/240 V para proteger contra sobretensiones transitorias. Funciona permaneciendo pasivo bajo voltaje normal, pero tan pronto como se produce una sobretensi\u00f3n, se convierte en una ruta de baja impedancia y redirige la sobrecorriente a tierra.<\/p>\r\n<p data-start=\"1606\" data-end=\"1905\">Los dispositivos de protecci\u00f3n monof\u00e1sicos se aplican ampliamente en tableros de distribuci\u00f3n residencial, edificios comerciales, sistemas solares fotovoltaicos y paneles de control industrial. En cada caso, extienden la vida \u00fatil de los equipos, reducen el tiempo de inactividad y cumplen con los requisitos de seguridad modernos.<\/p>\r\n<p data-start=\"1606\" data-end=\"1905\"><a href=\"https:\/\/www.britecelectric.com\/es\/blog\/how-to-choose-single-phase-surge-protection-device\/attachment\/br-20-4p-1type-2-surge-protection-device-jpg-3\/\" rel=\"attachment wp-att-2177\"><img class=\"alignnone wp-image-2177\" src=\"https:\/\/www.britecelectric.com\/wp-content\/uploads\/2025\/08\/BR-20-4P-1Type-2-Surge-Protection-Device.jpg-2-1024x1024.webp\" alt=\"\" width=\"914\" height=\"914\" \/><\/a><\/p>\r\n\r\n<h2 data-start=\"1912\" data-end=\"1954\">Normas IEC y clasificaci\u00f3n SPD<\/h2>\r\n<p data-start=\"1955\" data-end=\"2192\">La selecci\u00f3n de un dispositivo de protecci\u00f3n contra sobretensiones monof\u00e1sico debe estar alineado con los est\u00e1ndares internacionales, principalmente <a href=\"https:\/\/webstore.iec.ch\/en\/publication\/5682\" target=\"_blank\" rel=\"noopener\"><strong data-start=\"2071\" data-end=\"2087\">CEI 61643-11<\/strong><\/a> y <a href=\"http:\/\/IEC 61643-11\" target=\"_blank\" rel=\"noopener\"><strong data-start=\"2092\" data-end=\"2108\">CEI 61643-12<\/strong><\/a>. Estos definen las formas de onda de prueba, la clasificaci\u00f3n y las pautas de instalaci\u00f3n:<\/p>\r\n\r\n<ul data-start=\"2194\" data-end=\"2680\">\r\n \t<li data-start=\"2194\" data-end=\"2394\">\r\n<p data-start=\"2196\" data-end=\"2394\"><strong data-start=\"2196\" data-end=\"2210\">SPD tipo 1<\/strong>: Probado con forma de onda de 10\/350 \u00b5s, dise\u00f1ado para soportar corrientes directas de rayo. Instalado en la entrada de servicio donde haya l\u00edneas a\u00e9reas o sistemas de protecci\u00f3n contra rayos.<\/p>\r\n<\/li>\r\n \t<li data-start=\"2395\" data-end=\"2546\">\r\n<p data-start=\"2397\" data-end=\"2546\"><strong data-start=\"2397\" data-end=\"2411\">SPD tipo 2<\/strong>: Probado con forma de onda de 8\/20 \u00b5s, protege contra sobretensiones de conmutaci\u00f3n y rayos indirectos. Normalmente se instala en paneles de distribuci\u00f3n.<\/p>\r\n<\/li>\r\n \t<li data-start=\"2547\" data-end=\"2680\">\r\n<p data-start=\"2549\" data-end=\"2680\"><strong data-start=\"2549\" data-end=\"2563\">SPD tipo 3<\/strong>: Instalado cerca de cargas sensibles, garantiza una tensi\u00f3n residual muy baja (Up). Utilizado como \u00faltima etapa de protecci\u00f3n.<\/p>\r\n<\/li>\r\n<\/ul>\r\n<p data-start=\"2682\" data-end=\"2841\">Si desea profundizar en la clasificaci\u00f3n detallada de los SPD y c\u00f3mo se define cada tipo en est\u00e1ndares y aplicaciones pr\u00e1cticas, puede explorar nuestro art\u00edculo dedicado aqu\u00ed: <span style=\"text-decoration: underline; font-size: 20px;\"><a class=\"decorated-link\" href=\"https:\/\/www.britecelectric.com\/es\/blog\/classification-of-spds\/\" target=\"_blank\" rel=\"noopener\" data-start=\"1210\" data-end=\"1295\"><em><strong>Clasificaci\u00f3n de SPD<\/strong><\/em><\/a>.<\/span><\/p>\r\n\r\n<h2 data-start=\"2848\" data-end=\"2880\">Par\u00e1metros clave a considerar<\/h2>\r\n<p data-start=\"2881\" data-end=\"2984\">Al comparar diferentes SPD monof\u00e1sicos, varios par\u00e1metros son cr\u00edticos para una selecci\u00f3n adecuada:<\/p>\r\n\r\n<ul data-start=\"2986\" data-end=\"3881\">\r\n \t<li data-start=\"2986\" data-end=\"3181\">\r\n<p data-start=\"2988\" data-end=\"3181\"><strong data-start=\"2988\" data-end=\"3033\">Uc (voltaje m\u00e1ximo de funcionamiento continuo)<\/strong>: El voltaje RMS m\u00e1ximo que el dispositivo puede manejar sin degradaci\u00f3n. Para sistemas de 230\/240 V, el valor est\u00e1ndar es 275 V CA entre l\u00ednea y neutro.<\/p>\r\n<\/li>\r\n \t<li data-start=\"3182\" data-end=\"3307\">\r\n<p data-start=\"3184\" data-end=\"3307\"><strong data-start=\"3184\" data-end=\"3217\">Arriba (nivel de protecci\u00f3n de voltaje)<\/strong>: El voltaje fijado durante una sobretensi\u00f3n. La electr\u00f3nica sensible requiere hasta menos de 1,5\u20132,5 kV.<\/p>\r\n<\/li>\r\n \t<li data-start=\"3308\" data-end=\"3473\">\r\n<p data-start=\"3310\" data-end=\"3473\"><strong data-start=\"3310\" data-end=\"3344\">En (corriente de descarga nominal)<\/strong>: La corriente que el SPD puede descargar repetidamente sin fallar. Un buen SPD monof\u00e1sico debe manejar al menos 20 kA (8\/20 \u00b5s).<\/p>\r\n<\/li>\r\n \t<li data-start=\"3474\" data-end=\"3601\">\r\n<p data-start=\"3476\" data-end=\"3601\"><strong data-start=\"3476\" data-end=\"3512\">Imax (corriente de descarga m\u00e1xima)<\/strong>: La corriente m\u00e1xima que el SPD puede soportar en un solo evento, normalmente 40 kA o m\u00e1s.<\/p>\r\n<\/li>\r\n \t<li data-start=\"3602\" data-end=\"3759\">\r\n<p data-start=\"3604\" data-end=\"3759\"><strong data-start=\"3604\" data-end=\"3630\">Iimp (corriente de impulso)<\/strong>: Espec\u00edfico para SPD Tipo 1, probado con forma de onda de 10\/350 \u00b5s. Los valores comienzan en 12,5 kA; se recomiendan 25 kA en \u00e1reas de alto riesgo.<\/p>\r\n<\/li>\r\n \t<li data-start=\"3760\" data-end=\"3881\">\r\n<p data-start=\"3762\" data-end=\"3881\"><strong data-start=\"3762\" data-end=\"3779\">Tiempo de respuesta<\/strong>: Los SPD act\u00faan en nanosegundos. Cuanto m\u00e1s r\u00e1pida sea la reacci\u00f3n, mejor ser\u00e1 la protecci\u00f3n de los componentes electr\u00f3nicos sensibles.<\/p>\r\n<\/li>\r\n<\/ul>\r\n<p data-start=\"3883\" data-end=\"4010\">Estos par\u00e1metros siempre deben coincidir con el nivel de exposici\u00f3n del sistema, el tipo de conexi\u00f3n a tierra y la categor\u00eda de aislamiento del equipo.<\/p>\r\n\r\n<h2 data-start=\"4017\" data-end=\"4064\">Configuraciones de cableado y puesta a tierra del sistema<\/h2>\r\n<p data-start=\"4065\" data-end=\"4202\">El tipo de puesta a tierra muchas veces se pasa por alto, pero es uno de los factores m\u00e1s decisivos a la hora de elegir un Dispositivo de Protecci\u00f3n contra Sobretensiones Monof\u00e1sico.<\/p>\r\n\r\n<ul data-start=\"4204\" data-end=\"4774\">\r\n \t<li data-start=\"4204\" data-end=\"4497\">\r\n<p data-start=\"4206\" data-end=\"4497\"><strong data-start=\"4206\" data-end=\"4220\">Sistemas TT<\/strong>: Requiere SPD 1P+N (tambi\u00e9n llamado 1+1). Esta configuraci\u00f3n utiliza protecci\u00f3n MOV entre l\u00ednea y neutro, adem\u00e1s de un explosor o elemento dedicado entre neutro y PE. Garantiza una descarga controlada a tierra, lo cual es vital en TT, donde el potencial neutro puede aumentar durante las fallas.<\/p>\r\n<\/li>\r\n \t<li data-start=\"4498\" data-end=\"4670\">\r\n<p data-start=\"4500\" data-end=\"4670\"><strong data-start=\"4500\" data-end=\"4526\">Sistemas TN-S o TN-C-S<\/strong>: Puede utilizar 1P o 1P+N dependiendo del dise\u00f1o del cuadro de distribuci\u00f3n. Se deben proteger tanto las rutas de l\u00ednea a neutro como las de l\u00ednea a tierra.<\/p>\r\n<\/li>\r\n \t<li data-start=\"4671\" data-end=\"4774\">\r\n<p data-start=\"4673\" data-end=\"4774\"><strong data-start=\"4673\" data-end=\"4689\">Sistemas TN-C<\/strong>: Generalmente se aplican SPD 1P o 2P dependiendo de si el conductor PEN es accesible.<\/p>\r\n<\/li>\r\n<\/ul>\r\n<p data-start=\"4776\" data-end=\"5017\">Para todos los sistemas, las reglas de cableado siguen siendo las mismas: mantener la conexi\u00f3n a tierra del SPD lo m\u00e1s corta posible, idealmente menos de 0,5 m. Los cables largos aumentan la inductancia y, por lo tanto, aumentan el voltaje residual que ver\u00e1 el dispositivo protegido.<\/p>\r\n\r\n<h2 data-start=\"5024\" data-end=\"5058\">Gu\u00eda de selecci\u00f3n paso a paso<\/h2>\r\n<p data-start=\"5060\" data-end=\"5255\">Este es el coraz\u00f3n del proceso de toma de decisiones. Muchos ingenieros y compradores buscan espec\u00edficamente c\u00f3mo elegir un SPD monof\u00e1sico, por lo que esta secci\u00f3n proporciona una hoja de ruta pr\u00e1ctica y detallada:<\/p>\r\n\r\n<h3 data-start=\"5257\" data-end=\"5559\"><strong data-start=\"5257\" data-end=\"5295\">Paso 1: evaluar el riesgo y la exposici\u00f3n<\/strong><\/h3>\r\n<p data-start=\"5257\" data-end=\"5559\">Determinar si el edificio cuenta con un sistema externo de protecci\u00f3n contra rayos (SLP) o se alimenta mediante l\u00edneas a\u00e9reas. En caso afirmativo, es obligatorio un SPD Tipo 1 en la entrada de servicio. Para suministros subterr\u00e1neos en zonas de bajo riesgo, un tipo 2 de alta capacidad puede ser suficiente.<\/p>\r\n\r\n<h3 data-start=\"5561\" data-end=\"5803\"><strong data-start=\"5561\" data-end=\"5601\">Paso 2: identificar el sistema de puesta a tierra<\/strong><\/h3>\r\n<p data-start=\"5561\" data-end=\"5803\">Comprueba si tu instalaci\u00f3n es TT, TN-S, TN-C-S o TN-C. Esto determina si necesita un SPD 1P, un SPD 1P+N o un SPD 2P. Seleccionar una configuraci\u00f3n de cableado incorrecta puede hacer que el SPD sea ineficaz.<\/p>\r\n\r\n<h3 data-start=\"5805\" data-end=\"5846\"><strong data-start=\"5805\" data-end=\"5844\">Paso 3: Definir la etapa de protecci\u00f3n<\/strong><\/h3>\r\n<ul data-start=\"5847\" data-end=\"6077\">\r\n \t<li data-start=\"5847\" data-end=\"5908\">\r\n<p data-start=\"5849\" data-end=\"5908\">En la entrada de servicio: SPD Tipo 1 o Tipo 1+2 combinado.<\/p>\r\n<\/li>\r\n \t<li data-start=\"5909\" data-end=\"5978\">\r\n<p data-start=\"5911\" data-end=\"5978\">En cuadros de distribuci\u00f3n: Tipo 2, con In \u2265 20 kA e Imax \u2265 40 kA.<\/p>\r\n<\/li>\r\n \t<li data-start=\"5979\" data-end=\"6077\">\r\n<p data-start=\"5981\" data-end=\"6077\">En cargas sensibles: Tipo 3, para reducir por debajo la resistencia al aislamiento de los dispositivos electr\u00f3nicos.<\/p>\r\n<\/li>\r\n<\/ul>\r\n<h3 data-start=\"6079\" data-end=\"6159\"><strong data-start=\"6079\" data-end=\"6115\">Paso 4: seleccione las calificaciones t\u00e9cnicas<\/strong><\/h3>\r\n<p data-start=\"6079\" data-end=\"6159\">Haga coincidir las clasificaciones del SPD con su sistema:<\/p>\r\n\r\n<ul data-start=\"6160\" data-end=\"6369\">\r\n \t<li data-start=\"6160\" data-end=\"6197\">\r\n<p data-start=\"6162\" data-end=\"6197\">Uc: 275V AC para sistemas de 230\/240V.<\/p>\r\n<\/li>\r\n \t<li data-start=\"6198\" data-end=\"6304\">\r\n<p data-start=\"6200\" data-end=\"6304\">Arriba: Debe ser inferior a la categor\u00eda de aislamiento del equipo (IEC 60664: Cat II \u2248 2,5 kV, Cat III \u2248 4 kV).<\/p>\r\n<\/li>\r\n \t<li data-start=\"6305\" data-end=\"6369\">\r\n<p data-start=\"6307\" data-end=\"6369\">In\/Imax\/Iimp: Seg\u00fan nivel de instalaci\u00f3n y zona de riesgo.<\/p>\r\n<\/li>\r\n<\/ul>\r\n<h3 data-start=\"6371\" data-end=\"6689\"><strong data-start=\"6371\" data-end=\"6415\">Paso 5: Planificar la coordinaci\u00f3n entre etapas<\/strong><\/h3>\r\n<p data-start=\"6371\" data-end=\"6689\">Los SPD deben trabajar juntos. El dispositivo aguas arriba debe absorber energ\u00eda sin pasar voltaje destructivo aguas abajo, mientras que el SPD aguas abajo ajusta la protecci\u00f3n. Mantenga al menos 10 metros entre dispositivos o inserte una inductancia de desacoplamiento para garantizar un intercambio de energ\u00eda adecuado.<\/p>\r\n\r\n<h3 data-start=\"6691\" data-end=\"6928\"><strong data-start=\"6691\" data-end=\"6739\">Paso 6: Garantice una protecci\u00f3n adecuada contra sobrecorriente<\/strong><\/h3>\r\n<p data-start=\"6691\" data-end=\"6928\">Cada SPD requiere protecci\u00f3n de respaldo. A menos que el SPD incluya un fusible integrado, instale un MCB o un fusible en serie. Esto evita eventos de cortocircuito cuando el SPD llega al final de su vida \u00fatil.<\/p>\r\n\r\n<h3 data-start=\"6930\" data-end=\"7027\"><strong data-start=\"6930\" data-end=\"6979\">Paso 7: considere la vida \u00fatil y el mantenimiento<\/strong><\/h3>\r\n<p data-start=\"6930\" data-end=\"7027\">Los SPD se degradan con el tiempo. Elige modelos con:<\/p>\r\n\r\n<ul data-start=\"7028\" data-end=\"7241\">\r\n \t<li data-start=\"7028\" data-end=\"7093\">\r\n<p data-start=\"7030\" data-end=\"7093\">Ventanas de indicaci\u00f3n de estado que muestran condiciones verde\/roja.<\/p>\r\n<\/li>\r\n \t<li data-start=\"7094\" data-end=\"7162\">\r\n<p data-start=\"7096\" data-end=\"7162\">Contactos de se\u00f1alizaci\u00f3n remota para monitorizaci\u00f3n en sistemas de control.<\/p>\r\n<\/li>\r\n \t<li data-start=\"7163\" data-end=\"7241\">\r\n<p data-start=\"7165\" data-end=\"7241\">M\u00f3dulos enchufables reemplazables, por lo que el mantenimiento no requiere recableado.<\/p>\r\n<\/li>\r\n<\/ul>\r\n<p data-start=\"7243\" data-end=\"7418\">Seguir este proceso paso a paso garantiza que su SPD monof\u00e1sico no solo tenga la clasificaci\u00f3n correcta, sino que tambi\u00e9n est\u00e9 correctamente instalado y mantenido para una confiabilidad a largo plazo.<\/p>\r\n\r\n<h2 data-start=\"7425\" data-end=\"7476\">Consejos pr\u00e1cticos de instalaci\u00f3n y errores comunes<\/h2>\r\n<p data-start=\"7478\" data-end=\"7602\">Incluso los mejores dispositivos de protecci\u00f3n monof\u00e1sicos fallar\u00e1n si se instalan incorrectamente. Siga estos principios de ingenier\u00eda:<\/p>\r\n\r\n<ul data-start=\"7604\" data-end=\"7913\">\r\n \t<li data-start=\"7604\" data-end=\"7653\">\r\n<p data-start=\"7606\" data-end=\"7653\">Mantenga los cables cortos y directos, a menos de 0,5 m.<\/p>\r\n<\/li>\r\n \t<li data-start=\"7654\" data-end=\"7716\">\r\n<p data-start=\"7656\" data-end=\"7716\">Separe los cables de alimentaci\u00f3n y de se\u00f1al para evitar sobretensiones de acoplamiento.<\/p>\r\n<\/li>\r\n \t<li data-start=\"7717\" data-end=\"7769\">\r\n<p data-start=\"7719\" data-end=\"7769\">No junte los cables del SPD con circuitos protegidos.<\/p>\r\n<\/li>\r\n \t<li data-start=\"7770\" data-end=\"7844\">\r\n<p data-start=\"7772\" data-end=\"7844\">Conecte siempre la tierra del SPD a la barra de conexi\u00f3n equipotencial m\u00e1s cercana.<\/p>\r\n<\/li>\r\n \t<li data-start=\"7845\" data-end=\"7913\">\r\n<p data-start=\"7847\" data-end=\"7913\">Respetar las distancias de coordinaci\u00f3n entre las distintas etapas del SPD.<\/p>\r\n<\/li>\r\n<\/ul>\r\n<p data-start=\"7915\" data-end=\"8130\">Los errores comunes incluyen instalar solo una etapa, olvidar la protecci\u00f3n N-PE en sistemas TT o sobredimensionar los SPD sin una necesidad real. Cada uno de estos reduce la eficiencia de la protecci\u00f3n y aumenta los costos sin beneficio.<\/p>\r\n\r\n<h2 data-start=\"8137\" data-end=\"8163\">Aplicaciones de ejemplo<\/h2>\r\n<ul data-start=\"8165\" data-end=\"8850\">\r\n \t<li data-start=\"8165\" data-end=\"8343\">\r\n<p data-start=\"8167\" data-end=\"8343\"><strong data-start=\"8167\" data-end=\"8195\">Aplicaciones residenciales<\/strong>: Un SPD tipo 2 (En 20 kA, Imax 40 kA, Up &lt; 1,5 kV) instalado en el cuadro de distribuci\u00f3n principal protege los aparatos electr\u00f3nicos del hogar de las perturbaciones de la red.<\/p>\r\n<\/li>\r\n \t<li data-start=\"8344\" data-end=\"8498\">\r\n<p data-start=\"8346\" data-end=\"8498\"><strong data-start=\"8346\" data-end=\"8370\">Edificios Comerciales<\/strong>: Un SPD Tipo 1+2 en el tablero de distribuci\u00f3n principal combinado con SPD Tipo 2 en los paneles de distribuci\u00f3n del piso garantiza la continuidad del servicio.<\/p>\r\n<\/li>\r\n \t<li data-start=\"8499\" data-end=\"8673\">\r\n<p data-start=\"8501\" data-end=\"8673\"><strong data-start=\"8501\" data-end=\"8526\">Instalaciones Industriales<\/strong>: SPD Tipo 1 clasificados a 25 kA Iimp en la entrada de servicio, con SPD Tipo 2 coordinados en centros de control de motores y SPD Tipo 3 que protegen los PLC.<\/p>\r\n<\/li>\r\n \t<li data-start=\"8674\" data-end=\"8850\">\r\n<p data-start=\"8676\" data-end=\"8850\"><strong data-start=\"8676\" data-end=\"8696\">Sistemas solares fotovoltaicos<\/strong>: En el lado de CC, utilice SPD con clasificaci\u00f3n fotovoltaica. En el lado de CA, un SPD monof\u00e1sico tipo 2 en la salida del inversor protege tanto el inversor como la interfaz de red.<\/p>\r\n<\/li>\r\n<\/ul>\r\n<h2 data-start=\"8857\" data-end=\"8873\">Conclusi\u00f3n<\/h2>\r\n<p data-start=\"8875\" data-end=\"9090\">Elegir el dispositivo de protecci\u00f3n contra sobretensiones monof\u00e1sico adecuado requiere m\u00e1s que escanear una hoja de datos. Significa comprender su sistema, evaluar riesgos, aplicar est\u00e1ndares IEC y comparar par\u00e1metros cuidadosamente.<\/p>\r\n\r\n<ul data-start=\"9092\" data-end=\"9348\">\r\n \t<li data-start=\"9092\" data-end=\"9151\">\r\n<p data-start=\"9094\" data-end=\"9151\">En la entrada proteger contra rayos con Tipo 1.<\/p>\r\n<\/li>\r\n \t<li data-start=\"9152\" data-end=\"9203\">\r\n<p data-start=\"9154\" data-end=\"9203\">En la distribuci\u00f3n, conf\u00ede en dispositivos robustos de tipo 2.<\/p>\r\n<\/li>\r\n \t<li data-start=\"9204\" data-end=\"9266\">\r\n<p data-start=\"9206\" data-end=\"9266\">Para componentes electr\u00f3nicos sensibles, agregue Tipo 3 en el punto de uso.<\/p>\r\n<\/li>\r\n \t<li data-start=\"9267\" data-end=\"9348\">\r\n<p data-start=\"9269\" data-end=\"9348\">Respete siempre su sistema de puesta a tierra, pr\u00e1cticas de cableado y necesidades de mantenimiento.<\/p>\r\n<\/li>\r\n<\/ul>\r\n<p data-start=\"9350\" data-end=\"9539\">Al aplicar estos principios, los ingenieros el\u00e9ctricos y los profesionales de adquisiciones pueden garantizar que sus sistemas no solo cumplan con las normas, sino que tambi\u00e9n sean resilientes, rentables y est\u00e9n preparados para el futuro.<\/p>","protected":false},"featured_media":2175,"parent":0,"menu_order":120,"template":"","meta":{"_acf_changed":false},"blog_category":[8],"class_list":["post-2176","blog","type-blog","status-publish","has-post-thumbnail","hentry","blog_category-company-news"],"acf":{"des":"This blog provides a comprehensive guide on how to choose Single-Phase Surge Protection Devices for residential, commercial, and industrial applications. It explains SPD classifications under IEC standards, technical parameters like Uc, Up, In, Imax, and Iimp, wiring configurations for TT and TN systems, and a detailed step-by-step selection process. With practical installation tips and real-world application cases, the article offers engineers and procurement specialists actionable insights to ensure reliable surge protection.","txt":"<h2 data-start=\"474\" data-end=\"492\">Introduction<\/h2>\r\n<p data-start=\"493\" data-end=\"937\">Surges are one of the most underestimated threats in electrical systems. A sudden overvoltage, whether caused by lightning, grid switching, or even internal equipment, can degrade insulation, trip breakers, or destroy sensitive devices in an instant. A Single-Phase Surge Protection Device (SPD) is the first line of defense. It diverts excess energy to earth and ensures that the voltage reaching your equipment stays within safe limits.<\/p>\r\n<p data-start=\"939\" data-end=\"1244\">For electrical engineers and procurement specialists, the challenge is not whether to use a single phase SPD, but how to choose the right one. This guide provides a clear, technical, and practical approach that combines international standards, engineering best practices, and real-world experience.<\/p>\r\n\r\n<h2 data-start=\"1251\" data-end=\"1304\">What is a Single-Phase Surge Protection Device?<\/h2>\r\n<p data-start=\"1305\" data-end=\"1604\">A Single-Phase Surge Protection Device is installed in 230\/240V single-phase AC systems to guard against transient overvoltages. It operates by remaining passive under normal voltage, but as soon as a surge occurs, it becomes a low-impedance path and redirects the surge current to the ground.<\/p>\r\n<p data-start=\"1606\" data-end=\"1905\">Single phase protection devices are widely applied in residential distribution boards, commercial buildings, solar photovoltaic systems, and industrial control panels. In each case, they extend the lifetime of equipment, reduce downtime, and provide compliance with modern safety requirements.<\/p>\r\n<p data-start=\"1606\" data-end=\"1905\"><a href=\"https:\/\/www.britecelectric.com\/blog\/how-to-choose-single-phase-surge-protection-device\/attachment\/br-20-4p-1type-2-surge-protection-device-jpg-3\/\" rel=\"attachment wp-att-2177\"><img class=\"alignnone wp-image-2177\" src=\"https:\/\/www.britecelectric.com\/wp-content\/uploads\/2025\/08\/BR-20-4P-1Type-2-Surge-Protection-Device.jpg-2-1024x1024.webp\" alt=\"\" width=\"914\" height=\"914\" \/><\/a><\/p>\r\n\r\n<h2 data-start=\"1912\" data-end=\"1954\">IEC Standards and SPD Classification<\/h2>\r\n<p data-start=\"1955\" data-end=\"2192\">The selection of a surge protection device single phase must be aligned with international standards, primarily <a href=\"https:\/\/webstore.iec.ch\/en\/publication\/5682\" target=\"_blank\" rel=\"noopener\"><strong data-start=\"2071\" data-end=\"2087\">IEC 61643-11<\/strong><\/a> and <a href=\"http:\/\/IEC 61643-11\" target=\"_blank\" rel=\"noopener\"><strong data-start=\"2092\" data-end=\"2108\">IEC 61643-12<\/strong><\/a>. These define the testing waveforms, classification, and installation guidelines:<\/p>\r\n\r\n<ul data-start=\"2194\" data-end=\"2680\">\r\n \t<li data-start=\"2194\" data-end=\"2394\">\r\n<p data-start=\"2196\" data-end=\"2394\"><strong data-start=\"2196\" data-end=\"2210\">Type 1 SPD<\/strong>: Tested with 10\/350 \u00b5s waveform, designed to withstand direct lightning currents. Installed at the service entrance where overhead lines or lightning protection systems are present.<\/p>\r\n<\/li>\r\n \t<li data-start=\"2395\" data-end=\"2546\">\r\n<p data-start=\"2397\" data-end=\"2546\"><strong data-start=\"2397\" data-end=\"2411\">Type 2 SPD<\/strong>: Tested with 8\/20 \u00b5s waveform, protects against switching surges and indirect lightning. Typically installed in distribution panels.<\/p>\r\n<\/li>\r\n \t<li data-start=\"2547\" data-end=\"2680\">\r\n<p data-start=\"2549\" data-end=\"2680\"><strong data-start=\"2549\" data-end=\"2563\">Type 3 SPD<\/strong>: Installed close to sensitive loads, ensures very low residual voltage (Up). Used as the last stage of protection.<\/p>\r\n<\/li>\r\n<\/ul>\r\n<p data-start=\"2682\" data-end=\"2841\">If you want a deeper dive into the detailed classification of SPDs and how each type is defined in standards and practical applications, you can explore our dedicated article here: <span style=\"text-decoration: underline; font-size: 20px;\"><a class=\"decorated-link\" href=\"https:\/\/www.britecelectric.com\/blog\/classification-of-spds\/\" target=\"_blank\" rel=\"noopener\" data-start=\"1210\" data-end=\"1295\"><em><strong>Classification of SPDs<\/strong><\/em><\/a>.<\/span><\/p>\r\n\r\n<h2 data-start=\"2848\" data-end=\"2880\">Key Parameters to Consider<\/h2>\r\n<p data-start=\"2881\" data-end=\"2984\">When comparing different single phase SPDs, several parameters are critical for proper selection:<\/p>\r\n\r\n<ul data-start=\"2986\" data-end=\"3881\">\r\n \t<li data-start=\"2986\" data-end=\"3181\">\r\n<p data-start=\"2988\" data-end=\"3181\"><strong data-start=\"2988\" data-end=\"3033\">Uc (Maximum Continuous Operating Voltage)<\/strong>: The maximum RMS voltage the device can handle without degradation. For 230\/240V systems, the standard value is 275V AC between line and neutral.<\/p>\r\n<\/li>\r\n \t<li data-start=\"3182\" data-end=\"3307\">\r\n<p data-start=\"3184\" data-end=\"3307\"><strong data-start=\"3184\" data-end=\"3217\">Up (Voltage Protection Level)<\/strong>: The clamped voltage during a surge. Sensitive electronics require Up below 1.5\u20132.5 kV.<\/p>\r\n<\/li>\r\n \t<li data-start=\"3308\" data-end=\"3473\">\r\n<p data-start=\"3310\" data-end=\"3473\"><strong data-start=\"3310\" data-end=\"3344\">In (Nominal Discharge Current)<\/strong>: The current the SPD can discharge repeatedly without failure. A good single-phase SPD should handle at least 20 kA (8\/20 \u00b5s).<\/p>\r\n<\/li>\r\n \t<li data-start=\"3474\" data-end=\"3601\">\r\n<p data-start=\"3476\" data-end=\"3601\"><strong data-start=\"3476\" data-end=\"3512\">Imax (Maximum Discharge Current)<\/strong>: The maximum current the SPD can withstand in a single event, typically 40 kA or more.<\/p>\r\n<\/li>\r\n \t<li data-start=\"3602\" data-end=\"3759\">\r\n<p data-start=\"3604\" data-end=\"3759\"><strong data-start=\"3604\" data-end=\"3630\">Iimp (Impulse Current)<\/strong>: Specific for Type 1 SPDs, tested with 10\/350 \u00b5s waveform. Values start at 12.5 kA, with 25 kA recommended in high-risk areas.<\/p>\r\n<\/li>\r\n \t<li data-start=\"3760\" data-end=\"3881\">\r\n<p data-start=\"3762\" data-end=\"3881\"><strong data-start=\"3762\" data-end=\"3779\">Response Time<\/strong>: SPDs act in nanoseconds. The faster the reaction, the better protection for sensitive electronics.<\/p>\r\n<\/li>\r\n<\/ul>\r\n<p data-start=\"3883\" data-end=\"4010\">These parameters should always be matched with the system\u2019s exposure level, earthing type, and equipment insulation category.<\/p>\r\n\r\n<h2 data-start=\"4017\" data-end=\"4064\">System Earthing and Wiring Configurations<\/h2>\r\n<p data-start=\"4065\" data-end=\"4202\">Earthing type is often overlooked, but it is one of the most decisive factors when choosing a Single-Phase Surge Protection Device.<\/p>\r\n\r\n<ul data-start=\"4204\" data-end=\"4774\">\r\n \t<li data-start=\"4204\" data-end=\"4497\">\r\n<p data-start=\"4206\" data-end=\"4497\"><strong data-start=\"4206\" data-end=\"4220\">TT Systems<\/strong>: Require 1P+N (also called 1+1) SPD. This configuration uses MOV protection between line and neutral, plus a spark gap or dedicated element between neutral and PE. It ensures controlled discharge to earth, which is vital in TT where neutral potential can rise during faults.<\/p>\r\n<\/li>\r\n \t<li data-start=\"4498\" data-end=\"4670\">\r\n<p data-start=\"4500\" data-end=\"4670\"><strong data-start=\"4500\" data-end=\"4526\">TN-S or TN-C-S Systems<\/strong>: Can use either 1P or 1P+N depending on the design of the distribution board. Both line-to-neutral and line-to-earth paths must be protected.<\/p>\r\n<\/li>\r\n \t<li data-start=\"4671\" data-end=\"4774\">\r\n<p data-start=\"4673\" data-end=\"4774\"><strong data-start=\"4673\" data-end=\"4689\">TN-C Systems<\/strong>: Usually apply 1P or 2P SPDs depending on whether the PEN conductor is accessible.<\/p>\r\n<\/li>\r\n<\/ul>\r\n<p data-start=\"4776\" data-end=\"5017\">For all systems, wiring rules remain the same: keep the SPD\u2019s connection to earth as short as possible, ideally less than 0.5 m. Long leads increase inductance and therefore increase the residual voltage that the protected device will see.<\/p>\r\n\r\n<h2 data-start=\"5024\" data-end=\"5058\">Step-by-Step Selection Guide<\/h2>\r\n<p data-start=\"5060\" data-end=\"5255\">This is the heart of the decision-making process. Many engineers and buyers search specifically for how to choose a single phase SPD, so this section provides a detailed, practical roadmap:<\/p>\r\n\r\n<h3 data-start=\"5257\" data-end=\"5559\"><strong data-start=\"5257\" data-end=\"5295\">Step 1: Evaluate Risk and Exposure<\/strong><\/h3>\r\n<p data-start=\"5257\" data-end=\"5559\">Determine whether the building has an external lightning protection system (LPS) or is supplied by overhead lines. If yes, a Type 1 SPD at the service entrance is mandatory. For underground supplies in low-risk areas, a high-capacity Type 2 may be sufficient.<\/p>\r\n\r\n<h3 data-start=\"5561\" data-end=\"5803\"><strong data-start=\"5561\" data-end=\"5601\">Step 2: Identify the Earthing System<\/strong><\/h3>\r\n<p data-start=\"5561\" data-end=\"5803\">Check whether your installation is TT, TN-S, TN-C-S, or TN-C. This determines if you need a 1P SPD, a 1P+N SPD, or a 2P SPD. Selecting the wrong wiring configuration can render the SPD ineffective.<\/p>\r\n\r\n<h3 data-start=\"5805\" data-end=\"5846\"><strong data-start=\"5805\" data-end=\"5844\">Step 3: Define the Protection Stage<\/strong><\/h3>\r\n<ul data-start=\"5847\" data-end=\"6077\">\r\n \t<li data-start=\"5847\" data-end=\"5908\">\r\n<p data-start=\"5849\" data-end=\"5908\">At the service entrance: Type 1 or Type 1+2 combined SPD.<\/p>\r\n<\/li>\r\n \t<li data-start=\"5909\" data-end=\"5978\">\r\n<p data-start=\"5911\" data-end=\"5978\">At distribution panels: Type 2, with In \u2265 20 kA and Imax \u2265 40 kA.<\/p>\r\n<\/li>\r\n \t<li data-start=\"5979\" data-end=\"6077\">\r\n<p data-start=\"5981\" data-end=\"6077\">At sensitive loads: Type 3, to reduce Up below the insulation withstand of electronic devices.<\/p>\r\n<\/li>\r\n<\/ul>\r\n<h3 data-start=\"6079\" data-end=\"6159\"><strong data-start=\"6079\" data-end=\"6115\">Step 4: Select Technical Ratings<\/strong><\/h3>\r\n<p data-start=\"6079\" data-end=\"6159\">Match the SPD\u2019s ratings to your system:<\/p>\r\n\r\n<ul data-start=\"6160\" data-end=\"6369\">\r\n \t<li data-start=\"6160\" data-end=\"6197\">\r\n<p data-start=\"6162\" data-end=\"6197\">Uc: 275V AC for 230\/240V systems.<\/p>\r\n<\/li>\r\n \t<li data-start=\"6198\" data-end=\"6304\">\r\n<p data-start=\"6200\" data-end=\"6304\">Up: Must be lower than the equipment insulation category (IEC 60664: Cat II \u2248 2.5 kV, Cat III \u2248 4 kV).<\/p>\r\n<\/li>\r\n \t<li data-start=\"6305\" data-end=\"6369\">\r\n<p data-start=\"6307\" data-end=\"6369\">In\/Imax\/Iimp: According to installation level and risk zone.<\/p>\r\n<\/li>\r\n<\/ul>\r\n<h3 data-start=\"6371\" data-end=\"6689\"><strong data-start=\"6371\" data-end=\"6415\">Step 5: Plan Coordination Between Stages<\/strong><\/h3>\r\n<p data-start=\"6371\" data-end=\"6689\">SPDs must work together. The upstream device must absorb energy without passing destructive voltage downstream, while the downstream SPD fine-tunes protection. Maintain at least 10 meters between devices, or insert decoupling inductance to ensure proper energy sharing.<\/p>\r\n\r\n<h3 data-start=\"6691\" data-end=\"6928\"><strong data-start=\"6691\" data-end=\"6739\">Step 6: Ensure Proper Overcurrent Protection<\/strong><\/h3>\r\n<p data-start=\"6691\" data-end=\"6928\">Every SPD requires backup protection. Unless the SPD includes an integrated fuse, install an MCB or fuse in series. This prevents short-circuit events when the SPD reaches end of life.<\/p>\r\n\r\n<h3 data-start=\"6930\" data-end=\"7027\"><strong data-start=\"6930\" data-end=\"6979\">Step 7: Consider Service Life and Maintenance<\/strong><\/h3>\r\n<p data-start=\"6930\" data-end=\"7027\">SPDs degrade over time. Choose models with:<\/p>\r\n\r\n<ul data-start=\"7028\" data-end=\"7241\">\r\n \t<li data-start=\"7028\" data-end=\"7093\">\r\n<p data-start=\"7030\" data-end=\"7093\">Status indication windows that show green\/red conditions.<\/p>\r\n<\/li>\r\n \t<li data-start=\"7094\" data-end=\"7162\">\r\n<p data-start=\"7096\" data-end=\"7162\">Remote signaling contacts for monitoring in control systems.<\/p>\r\n<\/li>\r\n \t<li data-start=\"7163\" data-end=\"7241\">\r\n<p data-start=\"7165\" data-end=\"7241\">Replaceable plug-in modules, so maintenance does not require rewiring.<\/p>\r\n<\/li>\r\n<\/ul>\r\n<p data-start=\"7243\" data-end=\"7418\">Following this step-by-step process ensures that your single phase SPD is not only correctly rated but also correctly installed and maintained for long-term reliability.<\/p>\r\n\r\n<h2 data-start=\"7425\" data-end=\"7476\">Practical Installation Tips and Common Errors<\/h2>\r\n<p data-start=\"7478\" data-end=\"7602\">Even the best single phase protection devices will fail if installed incorrectly. Follow these engineering principles:<\/p>\r\n\r\n<ul data-start=\"7604\" data-end=\"7913\">\r\n \t<li data-start=\"7604\" data-end=\"7653\">\r\n<p data-start=\"7606\" data-end=\"7653\">Keep leads short and direct, less than 0.5 m.<\/p>\r\n<\/li>\r\n \t<li data-start=\"7654\" data-end=\"7716\">\r\n<p data-start=\"7656\" data-end=\"7716\">Separate power and signal cables to avoid coupling surges.<\/p>\r\n<\/li>\r\n \t<li data-start=\"7717\" data-end=\"7769\">\r\n<p data-start=\"7719\" data-end=\"7769\">Do not bundle SPD leads with protected circuits.<\/p>\r\n<\/li>\r\n \t<li data-start=\"7770\" data-end=\"7844\">\r\n<p data-start=\"7772\" data-end=\"7844\">Always connect the SPD earth to the closest equipotential bonding bar.<\/p>\r\n<\/li>\r\n \t<li data-start=\"7845\" data-end=\"7913\">\r\n<p data-start=\"7847\" data-end=\"7913\">Respect the coordination distances between different SPD stages.<\/p>\r\n<\/li>\r\n<\/ul>\r\n<p data-start=\"7915\" data-end=\"8130\">Common mistakes include installing only one stage, forgetting N-PE protection in TT systems, or oversizing SPDs without actual need. Each of these reduces protection efficiency and increases costs without benefit.<\/p>\r\n\r\n<h2 data-start=\"8137\" data-end=\"8163\">Example Applications<\/h2>\r\n<ul data-start=\"8165\" data-end=\"8850\">\r\n \t<li data-start=\"8165\" data-end=\"8343\">\r\n<p data-start=\"8167\" data-end=\"8343\"><strong data-start=\"8167\" data-end=\"8195\">Residential Applications<\/strong>: A Type 2 SPD (In 20 kA, Imax 40 kA, Up &lt; 1.5 kV) installed in the main distribution board protects household electronics from grid disturbances.<\/p>\r\n<\/li>\r\n \t<li data-start=\"8344\" data-end=\"8498\">\r\n<p data-start=\"8346\" data-end=\"8498\"><strong data-start=\"8346\" data-end=\"8370\">Commercial Buildings<\/strong>: A Type 1+2 SPD at the main switchboard combined with Type 2 SPDs at floor distribution panels ensures continuity of service.<\/p>\r\n<\/li>\r\n \t<li data-start=\"8499\" data-end=\"8673\">\r\n<p data-start=\"8501\" data-end=\"8673\"><strong data-start=\"8501\" data-end=\"8526\">Industrial Facilities<\/strong>: Type 1 SPDs rated at 25 kA Iimp at the service entrance, with coordinated Type 2 SPDs in motor control centers and Type 3 SPDs protecting PLCs.<\/p>\r\n<\/li>\r\n \t<li data-start=\"8674\" data-end=\"8850\">\r\n<p data-start=\"8676\" data-end=\"8850\"><strong data-start=\"8676\" data-end=\"8696\">Solar PV Systems<\/strong>: On the DC side, use PV-rated SPDs. On the AC side, a Type 2 single-phase SPD at the inverter output protects both the inverter and the grid interface.<\/p>\r\n<\/li>\r\n<\/ul>\r\n<h2 data-start=\"8857\" data-end=\"8873\">Conclusion<\/h2>\r\n<p data-start=\"8875\" data-end=\"9090\">Choosing the right Single-Phase Surge Protection Device requires more than scanning a datasheet. It means understanding your system, evaluating risks, applying IEC standards, and matching parameters carefully.<\/p>\r\n\r\n<ul data-start=\"9092\" data-end=\"9348\">\r\n \t<li data-start=\"9092\" data-end=\"9151\">\r\n<p data-start=\"9094\" data-end=\"9151\">At the entrance, protect against lightning with Type 1.<\/p>\r\n<\/li>\r\n \t<li data-start=\"9152\" data-end=\"9203\">\r\n<p data-start=\"9154\" data-end=\"9203\">In distribution, rely on robust Type 2 devices.<\/p>\r\n<\/li>\r\n \t<li data-start=\"9204\" data-end=\"9266\">\r\n<p data-start=\"9206\" data-end=\"9266\">For sensitive electronics, add Type 3 at the point of use.<\/p>\r\n<\/li>\r\n \t<li data-start=\"9267\" data-end=\"9348\">\r\n<p data-start=\"9269\" data-end=\"9348\">Always respect your earthing system, wiring practices, and maintenance needs.<\/p>\r\n<\/li>\r\n<\/ul>\r\n<p data-start=\"9350\" data-end=\"9539\">By applying these principles, electrical engineers and procurement professionals can ensure that their systems are not only compliant but also resilient, cost-effective, and future-ready.<\/p>"},"_links":{"self":[{"href":"https:\/\/www.britecelectric.com\/es\/wp-json\/wp\/v2\/blog\/2176","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\/2175"}],"wp:attachment":[{"href":"https:\/\/www.britecelectric.com\/es\/wp-json\/wp\/v2\/media?parent=2176"}],"wp:term":[{"taxonomy":"blog_category","embeddable":true,"href":"https:\/\/www.britecelectric.com\/es\/wp-json\/wp\/v2\/blog_category?post=2176"}],"curies":[{"name":"wp","href":"https:\/\/api.w.org\/{rel}","templated":true}]}}