{"id":26955,"date":"2024-11-12T13:32:21","date_gmt":"2024-11-12T05:32:21","guid":{"rendered":"https:\/\/www.cnspd.com\/?p=26955"},"modified":"2026-04-13T13:12:57","modified_gmt":"2026-04-13T05:12:57","slug":"comprehensive-guide-to-choosing-surge-protective-devices-spd-part-one","status":"publish","type":"post","link":"https:\/\/www.cnspd.com\/es\/guia-completa-para-la-eleccion-de-dispositivos-de-proteccion-contra-sobretensiones-spd-primera-parte\/","title":{"rendered":"Gu\u00eda completa para elegir dispositivos de protecci\u00f3n contra sobretensiones (SPD) (Primera parte)"},"content":{"rendered":"<div id=\"ez-toc-container\" class=\"ez-toc-v2_0_82_2 counter-hierarchy ez-toc-counter ez-toc-grey ez-toc-container-direction\">\n<div class=\"ez-toc-title-container\">\n<p class=\"ez-toc-title\" style=\"cursor:inherit\">\u00cdndice<\/p>\n<span class=\"ez-toc-title-toggle\"><a href=\"#\" class=\"ez-toc-pull-right ez-toc-btn ez-toc-btn-xs ez-toc-btn-default ez-toc-toggle\" aria-label=\"Alternar tabla de contenidos\"><span class=\"ez-toc-js-icon-con\"><span class=\"\"><span class=\"eztoc-hide\" style=\"display:none;\">Toggle<\/span><span class=\"ez-toc-icon-toggle-span\"><svg style=\"fill: #999;color:#999\" xmlns=\"http:\/\/www.w3.org\/2000\/svg\" class=\"list-377408\" width=\"20px\" height=\"20px\" viewbox=\"0 0 24 24\" fill=\"none\"><path d=\"M6 6H4v2h2V6zm14 0H8v2h12V6zM4 11h2v2H4v-2zm16 0H8v2h12v-2zM4 16h2v2H4v-2zm16 0H8v2h12v-2z\" fill=\"currentColor\"><\/path><\/svg><svg style=\"fill: #999;color:#999\" class=\"arrow-unsorted-368013\" xmlns=\"http:\/\/www.w3.org\/2000\/svg\" width=\"10px\" height=\"10px\" viewbox=\"0 0 24 24\" version=\"1.2\" baseprofile=\"tiny\"><path d=\"M18.2 9.3l-6.2-6.3-6.2 6.3c-.2.2-.3.4-.3.7s.1.5.3.7c.2.2.4.3.7.3h11c.3 0 .5-.1.7-.3.2-.2.3-.5.3-.7s-.1-.5-.3-.7zM5.8 14.7l6.2 6.3 6.2-6.3c.2-.2.3-.5.3-.7s-.1-.5-.3-.7c-.2-.2-.4-.3-.7-.3h-11c-.3 0-.5.1-.7.3-.2.2-.3.5-.3.7s.1.5.3.7z\"\/><\/svg><\/span><\/span><\/span><\/a><\/span><\/div>\n<nav><ul class='ez-toc-list ez-toc-list-level-1' ><li class='ez-toc-page-1 ez-toc-heading-level-2'><a class=\"ez-toc-link ez-toc-heading-1\" href=\"#\" data-href=\"https:\/\/www.cnspd.com\/es\/guia-completa-para-la-eleccion-de-dispositivos-de-proteccion-contra-sobretensiones-spd-primera-parte\/#i-understanding-surge-protective-devices-spd\" >I. Descripci\u00f3n de los dispositivos de protecci\u00f3n contra sobretensiones (SPD)<\/a><ul class='ez-toc-list-level-3' ><li class='ez-toc-heading-level-3'><a class=\"ez-toc-link ez-toc-heading-2\" href=\"#\" data-href=\"https:\/\/www.cnspd.com\/es\/guia-completa-para-la-eleccion-de-dispositivos-de-proteccion-contra-sobretensiones-spd-primera-parte\/#11-definition-and-working-principle\" >1.1 Definici\u00f3n y principio de funcionamiento<\/a><\/li><li class='ez-toc-page-1 ez-toc-heading-level-3'><a class=\"ez-toc-link ez-toc-heading-3\" href=\"#\" data-href=\"https:\/\/www.cnspd.com\/es\/guia-completa-para-la-eleccion-de-dispositivos-de-proteccion-contra-sobretensiones-spd-primera-parte\/#12-main-spd-types-applications\" >1.2 Principales tipos y aplicaciones de SPD<\/a><\/li><\/ul><\/li><li class='ez-toc-page-1 ez-toc-heading-level-2'><a class=\"ez-toc-link ez-toc-heading-4\" href=\"#\" data-href=\"https:\/\/www.cnspd.com\/es\/guia-completa-para-la-eleccion-de-dispositivos-de-proteccion-contra-sobretensiones-spd-primera-parte\/#ii-determining-protection-needs\" >II. Determinaci\u00f3n de las necesidades de protecci\u00f3n<\/a><ul class='ez-toc-list-level-3' ><li class='ez-toc-heading-level-3'><a class=\"ez-toc-link ez-toc-heading-5\" href=\"#\" data-href=\"https:\/\/www.cnspd.com\/es\/guia-completa-para-la-eleccion-de-dispositivos-de-proteccion-contra-sobretensiones-spd-primera-parte\/#21-assessing-system-sensitivity\" >2.1 Evaluaci\u00f3n de la sensibilidad del sistema<\/a><\/li><li class='ez-toc-page-1 ez-toc-heading-level-3'><a class=\"ez-toc-link ez-toc-heading-6\" href=\"#\" data-href=\"https:\/\/www.cnspd.com\/es\/guia-completa-para-la-eleccion-de-dispositivos-de-proteccion-contra-sobretensiones-spd-primera-parte\/#22-defining-protection-levels-and-standards\" >2.2 Definici\u00f3n de niveles y normas de protecci\u00f3n<\/a><\/li><\/ul><\/li><li class='ez-toc-page-1 ez-toc-heading-level-2'><a class=\"ez-toc-link ez-toc-heading-7\" href=\"#\" data-href=\"https:\/\/www.cnspd.com\/es\/guia-completa-para-la-eleccion-de-dispositivos-de-proteccion-contra-sobretensiones-spd-primera-parte\/#iii-choosing-the-right-spd\" >III. Elegir el DOCUP adecuado<\/a><ul class='ez-toc-list-level-3' ><li class='ez-toc-heading-level-3'><a class=\"ez-toc-link ez-toc-heading-8\" href=\"#\" data-href=\"https:\/\/www.cnspd.com\/es\/guia-completa-para-la-eleccion-de-dispositivos-de-proteccion-contra-sobretensiones-spd-primera-parte\/#31-matching-spd-to-system-needs\" >3.1 Adaptar el DOCUP a las necesidades del sistema<\/a><\/li><li class='ez-toc-page-1 ez-toc-heading-level-3'><a class=\"ez-toc-link ez-toc-heading-9\" href=\"#\" data-href=\"https:\/\/www.cnspd.com\/es\/guia-completa-para-la-eleccion-de-dispositivos-de-proteccion-contra-sobretensiones-spd-primera-parte\/#32-comparing-spd-types\" >3.2 Comparaci\u00f3n de tipos de DOCUP<\/a><\/li><\/ul><\/li><li class='ez-toc-page-1 ez-toc-heading-level-2'><a class=\"ez-toc-link ez-toc-heading-10\" href=\"#\" data-href=\"https:\/\/www.cnspd.com\/es\/guia-completa-para-la-eleccion-de-dispositivos-de-proteccion-contra-sobretensiones-spd-primera-parte\/#iv-key-technical-parameters\" >IV. Par\u00e1metros t\u00e9cnicos clave<\/a><ul class='ez-toc-list-level-3' ><li class='ez-toc-heading-level-3'><a class=\"ez-toc-link ez-toc-heading-11\" href=\"#\" data-href=\"https:\/\/www.cnspd.com\/es\/guia-completa-para-la-eleccion-de-dispositivos-de-proteccion-contra-sobretensiones-spd-primera-parte\/#41-continuous-operating-voltage-uc\" >4.1 Tensi\u00f3n continua de funcionamiento (Uc)<\/a><\/li><li class='ez-toc-page-1 ez-toc-heading-level-3'><a class=\"ez-toc-link ez-toc-heading-12\" href=\"#\" data-href=\"https:\/\/www.cnspd.com\/es\/guia-completa-para-la-eleccion-de-dispositivos-de-proteccion-contra-sobretensiones-spd-primera-parte\/#42-in-and-imax-values\" >4.2 Valores In e Imax<\/a><\/li><li class='ez-toc-page-1 ez-toc-heading-level-3'><a class=\"ez-toc-link ez-toc-heading-13\" href=\"#\" data-href=\"https:\/\/www.cnspd.com\/es\/guia-completa-para-la-eleccion-de-dispositivos-de-proteccion-contra-sobretensiones-spd-primera-parte\/#%e2%9c%85-final-summary-i%e2%80%93iv\" >\u2705 Resumen final (I-IV)<\/a><\/li><li class='ez-toc-page-1 ez-toc-heading-level-3'><a class=\"ez-toc-link ez-toc-heading-14\" href=\"#\" data-href=\"https:\/\/www.cnspd.com\/es\/guia-completa-para-la-eleccion-de-dispositivos-de-proteccion-contra-sobretensiones-spd-primera-parte\/#click-to-view-spd-guide-part-two\" >Haga clic para ver la segunda parte de la Gu\u00eda del DOCUP<\/a><\/li><\/ul><\/li><\/ul><\/nav><\/div>\n<h2 data-start=\"138\" data-end=\"188\"><span class=\"ez-toc-section\" id=\"i-understanding-surge-protective-devices-spd\"><\/span>I. Descripci\u00f3n de los dispositivos de protecci\u00f3n contra sobretensiones (SPD)<span class=\"ez-toc-section-end\"><\/span><\/h2>\n<h3 data-start=\"190\" data-end=\"230\"><span class=\"ez-toc-section\" id=\"11-definition-and-working-principle\"><\/span>1.1 Definici\u00f3n y principio de funcionamiento<span class=\"ez-toc-section-end\"><\/span><\/h3>\n<p data-start=\"232\" data-end=\"736\">Los dispositivos de protecci\u00f3n contra sobretensiones (SPD) protegen los equipos electr\u00f3nicos de las sobretensiones. Estas sobretensiones son el resultado de rayos, conmutaciones del sistema o fallos. Aunque breves, transportan una gran energ\u00eda. Los SPD proporcionan una v\u00eda de baja impedancia que dirige de forma segura la corriente de sobretensi\u00f3n a tierra. Las normas IEC garantizan que los SPD limitan las sobretensiones a niveles seguros, normalmente inferiores a 2,5 kV. Los SPD de alta calidad reaccionan en cuesti\u00f3n de nanosegundos. Elija los SPD en funci\u00f3n de las necesidades del sistema y las especificaciones t\u00e9cnicas. Esta combinaci\u00f3n garantiza la protecci\u00f3n cuando m\u00e1s importa.<\/p>\n<h3 data-start=\"738\" data-end=\"775\"><span class=\"ez-toc-section\" id=\"12-main-spd-types-applications\"><\/span>1.2 Principales tipos y aplicaciones de SPD<span class=\"ez-toc-section-end\"><\/span><\/h3>\n<p data-start=\"777\" data-end=\"804\">Los DOCUP pueden ser de tres tipos:<\/p>\n<ul data-start=\"806\" data-end=\"1142\">\n<li data-start=\"806\" data-end=\"907\">\n<p data-start=\"808\" data-end=\"907\"><strong data-start=\"808\" data-end=\"834\">SPD de conmutaci\u00f3n de tensi\u00f3n<\/strong> se adaptan a las l\u00edneas de transmisi\u00f3n de alta tensi\u00f3n. Act\u00faan con rapidez para detener fuertes sobretensiones.<\/p>\n<\/li>\n<li data-start=\"908\" data-end=\"1007\">\n<p data-start=\"910\" data-end=\"1007\"><strong data-start=\"910\" data-end=\"935\">SPD limitadores de tensi\u00f3n<\/strong> se adaptan a los sistemas de baja tensi\u00f3n. Frenan los picos de tensi\u00f3n en hogares y oficinas.<\/p>\n<\/li>\n<li data-start=\"1008\" data-end=\"1142\">\n<p data-start=\"1010\" data-end=\"1142\"><strong data-start=\"1010\" data-end=\"1027\">DOCUP combinados<\/strong> mezclan ambas caracter\u00edsticas. Util\u00edcelos en lugares como hospitales y centros de datos. Garantizan una reacci\u00f3n y protecci\u00f3n r\u00e1pidas.<\/p>\n<\/li>\n<\/ul>\n<p data-start=\"1144\" data-end=\"1304\">Seg\u00fan la CEI, debe evaluar la sensibilidad del sistema y elegir el SPD adecuado. Un estudio de caso realizado en un hospital demostr\u00f3 que los SPD limitadores de tensi\u00f3n reducen los fallos relacionados con sobretensiones en m\u00e1s de 70%.<\/p>\n<hr data-start=\"1306\" data-end=\"1309\" \/>\n<h2 data-start=\"1311\" data-end=\"1346\"><span class=\"ez-toc-section\" id=\"ii-determining-protection-needs\"><\/span>II. Determinaci\u00f3n de las necesidades de protecci\u00f3n<span class=\"ez-toc-section-end\"><\/span><\/h2>\n<h3 data-start=\"1348\" data-end=\"1384\"><span class=\"ez-toc-section\" id=\"21-assessing-system-sensitivity\"><\/span>2.1 Evaluaci\u00f3n de la sensibilidad del sistema<span class=\"ez-toc-section-end\"><\/span><\/h3>\n<p data-start=\"1386\" data-end=\"1701\">La sensibilidad del sistema depende de la tolerancia del dispositivo a los picos de tensi\u00f3n. Por ejemplo, los servidores y controles son muy sensibles. Los motores y la iluminaci\u00f3n toleran m\u00e1s. Las normas IEEE clasifican esta sensibilidad. Un centro de datos sufri\u00f3 p\u00e9rdidas millonarias antes de instalar los SPD. Debe evaluar la sensibilidad para elegir el SPD adecuado.<\/p>\n<h3 data-start=\"1703\" data-end=\"1751\"><span class=\"ez-toc-section\" id=\"22-defining-protection-levels-and-standards\"><\/span>2.2 Definici\u00f3n de niveles y normas de protecci\u00f3n<span class=\"ez-toc-section-end\"><\/span><\/h3>\n<p data-start=\"1753\" data-end=\"2055\">Los niveles de protecci\u00f3n se seleccionan seg\u00fan la norma IEC 61643. Los edificios residenciales necesitan niveles m\u00e1s bajos. Los sistemas cr\u00edticos necesitan mayor protecci\u00f3n. Una planta qu\u00edmica que sigui\u00f3 la norma IEC 61643-11 experiment\u00f3 un descenso de 70% en fallos de equipos. Compruebe tambi\u00e9n las certificaciones UL 1449 y EN 61643. Confirman el cumplimiento de la normativa local.<\/p>\n<hr data-start=\"2057\" data-end=\"2060\" \/>\n<h2 data-start=\"2062\" data-end=\"2092\"><span class=\"ez-toc-section\" id=\"iii-choosing-the-right-spd\"><\/span>III. Elegir el DOCUP adecuado<span class=\"ez-toc-section-end\"><\/span><\/h2>\n<h3 data-start=\"2094\" data-end=\"2130\"><span class=\"ez-toc-section\" id=\"31-matching-spd-to-system-needs\"><\/span>3.1 Adaptar el DOCUP a las necesidades del sistema<span class=\"ez-toc-section-end\"><\/span><\/h3>\n<p data-start=\"2132\" data-end=\"2365\">Empiece por examinar su instalaci\u00f3n el\u00e9ctrica. Para equipos sensibles, como los servidores de centros de datos o de diagn\u00f3stico por imagen de hospitales, utilice SPD con niveles de protecci\u00f3n de baja tensi\u00f3n (VPL). La norma IEC 61643-11 recomienda que los VPL se mantengan por debajo de la ventana de tolerancia del sistema.<\/p>\n<p data-start=\"2367\" data-end=\"2547\">Para entornos de alta energ\u00eda, como plantas qu\u00edmicas, seleccione SPD con corrientes de descarga nominal (In) y m\u00e1xima (Imax) adecuadas. Aseg\u00farese de que Imax cumple con la corriente de sobretensi\u00f3n m\u00e1xima esperada.<\/p>\n<p data-start=\"2549\" data-end=\"2686\">Los SPD para exteriores necesitan un dise\u00f1o robusto: resistentes a la intemperie, a la corrosi\u00f3n y al calor. Esto incluye plataformas marinas o climas adversos.<\/p>\n<h3 data-start=\"2688\" data-end=\"2715\"><span class=\"ez-toc-section\" id=\"32-comparing-spd-types\"><\/span>3.2 Comparaci\u00f3n de tipos de DOCUP<span class=\"ez-toc-section-end\"><\/span><\/h3>\n<ul data-start=\"2717\" data-end=\"3065\">\n<li data-start=\"2717\" data-end=\"2860\">\n<p data-start=\"2719\" data-end=\"2860\"><strong data-start=\"2719\" data-end=\"2750\">Tipo 1 (conmutaci\u00f3n de tensi\u00f3n):<\/strong> Controla los rayos directos. Se instala en la entrada de servicio. En rangos de 10 kA a 120 kA seg\u00fan IEC 61643-11.<\/p>\n<\/li>\n<li data-start=\"2861\" data-end=\"2958\">\n<p data-start=\"2863\" data-end=\"2958\"><strong data-start=\"2863\" data-end=\"2893\">Tipo 2 (limitador de tensi\u00f3n):<\/strong> Dise\u00f1ado para la protecci\u00f3n interna contra sobretensiones. In es t\u00edpicamente 5-40 kA.<\/p>\n<\/li>\n<li data-start=\"2959\" data-end=\"3065\">\n<p data-start=\"2961\" data-end=\"3065\"><strong data-start=\"2961\" data-end=\"2981\">H\u00edbrido\/Combinado:<\/strong> Ofrece protecci\u00f3n en toda la gama. Aunque es m\u00e1s caro, ahorra tiempo de inactividad y mantenimiento.<\/p>\n<\/li>\n<\/ul>\n<p data-start=\"3067\" data-end=\"3123\">Equilibrar costes y prestaciones para garantizar la seguridad a largo plazo.<\/p>\n<hr data-start=\"3125\" data-end=\"3128\" \/>\n<h2 data-start=\"3130\" data-end=\"3161\"><span class=\"ez-toc-section\" id=\"iv-key-technical-parameters\"><\/span>IV. Par\u00e1metros t\u00e9cnicos clave<span class=\"ez-toc-section-end\"><\/span><\/h2>\n<h3 data-start=\"3163\" data-end=\"3204\"><span class=\"ez-toc-section\" id=\"41-continuous-operating-voltage-uc\"><\/span>4.1 Tensi\u00f3n continua de funcionamiento (Uc)<span class=\"ez-toc-section-end\"><\/span><\/h3>\n<p data-start=\"3206\" data-end=\"3467\">Uc indica la tensi\u00f3n m\u00e1s alta que puede soportar el SPD sin activarse. Para sistemas de 230 VCA, elija Uc al menos 10-20% por encima de la tensi\u00f3n nominal. Los datos de la industria muestran que los SPDs infravalorados se activan m\u00e1s a menudo, aumentando el mantenimiento. Elija sabiamente para equilibrar coste y fiabilidad.<\/p>\n<h3 data-start=\"3469\" data-end=\"3495\"><span class=\"ez-toc-section\" id=\"42-in-and-imax-values\"><\/span>4.2 Valores In e Imax<span class=\"ez-toc-section-end\"><\/span><\/h3>\n<ul data-start=\"3497\" data-end=\"3686\">\n<li data-start=\"3497\" data-end=\"3585\">\n<p data-start=\"3499\" data-end=\"3585\"><strong data-start=\"3499\" data-end=\"3534\">Corriente nominal de descarga (In):<\/strong> Corriente sostenida que el SPD maneja repetidamente.<\/p>\n<\/li>\n<li data-start=\"3586\" data-end=\"3686\">\n<p data-start=\"3588\" data-end=\"3686\"><strong data-start=\"3588\" data-end=\"3625\">Corriente m\u00e1xima de descarga (Imax):<\/strong> La corriente de sobretensi\u00f3n m\u00e1s alta que el SPD puede tolerar en un evento.<\/p>\n<\/li>\n<\/ul>\n<p data-start=\"3688\" data-end=\"3700\">Por ejemplo:<\/p>\n<ul data-start=\"3701\" data-end=\"3781\">\n<li data-start=\"3701\" data-end=\"3737\">\n<p data-start=\"3703\" data-end=\"3737\">In = 20 kA se encarga de las sobretensiones t\u00edpicas.<\/p>\n<\/li>\n<li data-start=\"3738\" data-end=\"3781\">\n<p data-start=\"3740\" data-end=\"3781\">Imax = 40 kA puede soportar casos extremos.<\/p>\n<\/li>\n<\/ul>\n<p data-start=\"3783\" data-end=\"3948\">Elegir los valores adecuados previene aver\u00edas en los equipos y evita sustituciones innecesarias. El adagio de Franklin es v\u00e1lido: \"M\u00e1s vale prevenir que curar\".<\/p>\n<hr data-start=\"3950\" data-end=\"3953\" \/>\n<h3 data-start=\"3955\" data-end=\"3981\"><span class=\"ez-toc-section\" id=\"%e2%9c%85-final-summary-i%e2%80%93iv\"><\/span>\u2705 Resumen final (I-IV)<span class=\"ez-toc-section-end\"><\/span><\/h3>\n<p data-start=\"3983\" data-end=\"4009\">Esta secci\u00f3n de la gu\u00eda cubre:<\/p>\n<ul data-start=\"4010\" data-end=\"4202\">\n<li data-start=\"4010\" data-end=\"4050\">\n<p data-start=\"4012\" data-end=\"4050\">Conceptos b\u00e1sicos de los DOCUP: finalidad y funcionamiento.<\/p>\n<\/li>\n<li data-start=\"4051\" data-end=\"4085\">\n<p data-start=\"4053\" data-end=\"4085\">Tipos de DOCUP y d\u00f3nde utilizarlos.<\/p>\n<\/li>\n<li data-start=\"4086\" data-end=\"4148\">\n<p data-start=\"4088\" data-end=\"4148\">Evaluar la sensibilidad del sistema y los niveles de protecci\u00f3n necesarios.<\/p>\n<\/li>\n<li data-start=\"4149\" data-end=\"4202\">\n<p data-start=\"4151\" data-end=\"4202\">Especificaciones clave: Uc, In, Imax y selecci\u00f3n de aplicaciones.<\/p>\n<\/li>\n<\/ul>\n<p data-start=\"4204\" data-end=\"4321\" data-is-last-node=\"\" data-is-only-node=\"\">La siguiente secci\u00f3n abordar\u00e1 la instalaci\u00f3n, el mantenimiento, la normativa, la econom\u00eda y los estudios de casos.<\/p>\n<h3><span class=\"ez-toc-section\" id=\"click-to-view-spd-guide-part-two\"><\/span><a href=\"https:\/\/www.cnspd.com\/es\/guia-completa-para-la-eleccion-de-dispositivos-de-proteccion-contra-sobretensiones-spd-segunda-parte\/\">Haga clic para ver la segunda parte de la Gu\u00eda del DOCUP<\/a><span class=\"ez-toc-section-end\"><\/span><\/h3>\n<p>&nbsp;<\/p>","protected":false},"excerpt":{"rendered":"<p>I. Comprensi\u00f3n de los dispositivos de protecci\u00f3n contra sobretensiones (SPD) 1.1 Definici\u00f3n y principio de funcionamiento Los dispositivos de protecci\u00f3n contra sobretensiones (SPD) protegen los equipos electr\u00f3nicos de las sobretensiones. Estas sobretensiones son el resultado de rayos, conmutaciones del sistema o fallos. Aunque breves, transportan una gran energ\u00eda. Los SPD proporcionan una v\u00eda de baja impedancia que dirige de forma segura la corriente de sobretensi\u00f3n a tierra. Las normas IEC garantizan que los SPD limitan las sobretensiones a...<\/p>","protected":false},"author":18,"featured_media":26956,"comment_status":"closed","ping_status":"open","sticky":false,"template":"","format":"standard","meta":{"footnotes":""},"categories":[1,488,422],"tags":[],"class_list":["post-26955","post","type-post","status-publish","format-standard","has-post-thumbnail","hentry","category-news","category-surge-protection","category-industry-news"],"acf":[],"yoast_head":"<!-- This site is optimized with the Yoast SEO plugin v27.2 - https:\/\/yoast.com\/product\/yoast-seo-wordpress\/ -->\n<title>Guide to Choosing Surge Protective Devices<\/title>\n<meta name=\"description\" content=\"This blog is about Guide to Choosing Surge Protective Devices . 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