{"id":19296,"date":"2025-08-13T09:59:46","date_gmt":"2025-08-13T07:59:46","guid":{"rendered":"https:\/\/ganaenergia.com\/blog\/?p=19296"},"modified":"2026-08-06T10:14:02","modified_gmt":"2026-08-06T08:14:02","slug":"rele-termico","status":"publish","type":"post","link":"https:\/\/ganaenergia.com\/blog\/rele-termico\/","title":{"rendered":"Rel\u00e9 t\u00e9rmico: \u00bfQu\u00e9 es, c\u00f3mo funciona y c\u00f3mo elegir el adecuado?"},"content":{"rendered":"<p>Si alguna vez has tenido que proteger un motor el\u00e9ctrico de sobrecalentamientos o paradas inesperadas, es muy probable que te hayas topado con un <strong>rel\u00e9 t\u00e9rmico<\/strong>. Tras hablar con profesionales que han trabajado durante a\u00f1os con cuadros el\u00e9ctricos industriales, puedo decir que elegir el rel\u00e9 adecuado puede marcar la diferencia entre un sistema fiable y uno problem\u00e1tico. En esta gu\u00eda te explico todo lo que necesitas saber, con ejemplos reales, para que tomes la mejor decisi\u00f3n.<\/p>\n<h2>\u00bfQu\u00e9 es un rel\u00e9 t\u00e9rmico?<\/h2>\n<p>Un rel\u00e9 t\u00e9rmico es un dispositivo de protecci\u00f3n que se instala junto a un contactor para proteger motores el\u00e9ctricos frente a sobrecargas. Su funci\u00f3n principal es interrumpir el funcionamiento del motor cuando detecta que la corriente supera durante cierto tiempo el valor nominal para el que ha sido dise\u00f1ado.<\/p>\n<p>Est\u00e1 compuesto por elementos bimet\u00e1licos que se deforman al calentarse, activando un mecanismo de disparo que abre el circuito. Es una soluci\u00f3n econ\u00f3mica, fiable y muy utilizada en instalaciones industriales.<\/p>\n<p><img fetchpriority=\"high\" decoding=\"async\" class=\"aligncenter size-full wp-image-19308\" src=\"https:\/\/ganaenergia.com\/blog\/wp-content\/uploads\/2025\/08\/rele-termico-1.jpg\" alt=\"rele\u0301 te\u0301rmico\" width=\"593\" height=\"330\" srcset=\"https:\/\/ganaenergia.com\/blog\/wp-content\/uploads\/2025\/08\/rele-termico-1.jpg 593w, https:\/\/ganaenergia.com\/blog\/wp-content\/uploads\/2025\/08\/rele-termico-1-300x167.jpg 300w\" sizes=\"(max-width: 593px) 100vw, 593px\" \/><\/p>\n<h2>\u00bfC\u00f3mo funciona un rel\u00e9 t\u00e9rmico?<\/h2>\n<ol>\n<li>El motor arranca y empieza a consumir corriente.<\/li>\n<li>Si la corriente supera el valor nominal de forma continua (por ejemplo, por un eje bloqueado o una carga excesiva), el bimetal se calienta.<\/li>\n<li>Al alcanzar cierta temperatura, el bimetal se deforma y activa el disparo.<\/li>\n<li>El circuito se abre y el motor se desconecta para evitar da\u00f1os mayores.<\/li>\n<\/ol>\n<p>Este sistema es especialmente \u00fatil en aplicaciones donde no hay un control electr\u00f3nico avanzado o cuando se quiere a\u00f1adir una protecci\u00f3n sencilla a motores ya existentes.<\/p>\n<h2>Tipos de rel\u00e9 t\u00e9rmico<\/h2>\n<ul>\n<li><strong>Rel\u00e9 t\u00e9rmico bimet\u00e1lico:<\/strong> El m\u00e1s com\u00fan, mec\u00e1nico y econ\u00f3mico. Ideal para motores est\u00e1ndar.<\/li>\n<li><strong>Rel\u00e9 t\u00e9rmico electr\u00f3nico:<\/strong> M\u00e1s preciso, configurable y con m\u00e1s opciones de monitoreo. Recomendado para motores cr\u00edticos o sistemas automatizados.<\/li>\n<\/ul>\n<h2>\u00bfC\u00f3mo elegir el rel\u00e9 t\u00e9rmico adecuado?<\/h2>\n<p>Elegir un rel\u00e9 t\u00e9rmico no es solo mirar la <a href=\"https:\/\/ganaenergia.com\/blog\/corriente-nominal\/\" target=\"_blank\">corriente nominal<\/a>. Aqu\u00ed te comparto los factores clave que suelo tener en cuenta al seleccionar uno:<\/p>\n<ul>\n<li><strong>Corriente del motor:<\/strong> Elige un rel\u00e9 que cubra el rango de trabajo del motor (por ejemplo, 12\u201318 A).<\/li>\n<li><strong>Clase de disparo:<\/strong> Clase 10 es com\u00fan para motores est\u00e1ndar. Clase 20 o 30 para motores de arranque dif\u00edcil.<\/li>\n<li><strong>Compatibilidad con el contactor:<\/strong> Idealmente deben ser de la misma marca o serie para facilitar el montaje.<\/li>\n<li><strong>Tipo de rearme:<\/strong> Manual para seguridad, autom\u00e1tico para continuidad operativa.<\/li>\n<li><strong>Ambiente de trabajo:<\/strong> Algunos modelos compensan la temperatura ambiente, algo \u00fatil en salas t\u00e9cnicas sin climatizaci\u00f3n.<\/li>\n<\/ul>\n<h2>Ejemplo pr\u00e1ctico: instalaci\u00f3n de un rel\u00e9 t\u00e9rmico<\/h2>\n<p>Hace poco puede hablar con una persona que trabaj\u00f3 en una instalaci\u00f3n de bombas para una comunidad de regantes. Cada bomba ten\u00eda su motor trif\u00e1sico y necesitaban protecci\u00f3n contra sobrecarga. Optaron por rel\u00e9s t\u00e9rmicos bimet\u00e1licos con rearme manual y clase 10. El montaje fue directo sobre los contactores y en menos de una hora ten\u00edan todo protegido y en funcionamiento. Lo m\u00e1s importante: ning\u00fan motor se ha da\u00f1ado desde entonces.<\/p>\n<h2>Errores comunes al usar rel\u00e9s t\u00e9rmicos<\/h2>\n<ul>\n<li>No ajustar correctamente la corriente nominal (dejarlo al m\u00ednimo o al m\u00e1ximo).<\/li>\n<li>Ignorar la temperatura ambiente: puede hacer disparar el rel\u00e9 sin que haya una sobrecarga real.<\/li>\n<li>Conectar motores sin revisar el estado del rel\u00e9: si ha disparado, puede que no vuelva a arrancar hasta resetearlo.<\/li>\n<\/ul>\n<h2>\u00bfD\u00f3nde se usa un rel\u00e9 t\u00e9rmico?<\/h2>\n<ul>\n<li>Cuadros el\u00e9ctricos industriales<\/li>\n<li>Instalaciones de bombas de agua<\/li>\n<li>Sistemas HVAC<\/li>\n<li>M\u00e1quinas herramientas<\/li>\n<li>Ascensores y montacargas<\/li>\n<\/ul>\n<h2>Preguntas frecuentes<\/h2>\n<div class=\"faq-elementor\"><details class=\"faq-item\"><summary class=\"faq-summary\"><span class=\"faq-question\">\u00bfEs lo mismo un rel\u00e9 t\u00e9rmico que un disyuntor?<\/span><span class=\"faq-icon\"><svg xmlns=\"http:\/\/www.w3.org\/2000\/svg\"\n                    width=\"24\"\n                    height=\"24\"\n                    viewBox=\"0 0 24 24\"\n                    fill=\"none\"><path d=\"M12.1054 5.25L12.1055 12.25M12.1055 12.25L5.10547 12.25M12.1055 12.25L12.1055 19.2499M12.1055 12.25L19.1055 12.25\"\n                    stroke=\"#353646\"\n                    stroke-width=\"1.5\"\n                    stroke-linecap=\"round\"\n                    stroke-linejoin=\"round\"\/><\/svg><\/span><\/summary><div class=\"faq-answer\">No. El disyuntor protege frente a cortocircuitos y sobrecargas intensas. El rel\u00e9 t\u00e9rmico act\u00faa frente a sobrecargas prolongadas.<\/div><\/details><details class=\"faq-item\"><summary class=\"faq-summary\"><span class=\"faq-question\">\u00bfPuedo usar un rel\u00e9 t\u00e9rmico en motores monof\u00e1sicos?<\/span><span class=\"faq-icon\"><svg xmlns=\"http:\/\/www.w3.org\/2000\/svg\"\n                    width=\"24\"\n                    height=\"24\"\n                    viewBox=\"0 0 24 24\"\n                    fill=\"none\"><path d=\"M12.1054 5.25L12.1055 12.25M12.1055 12.25L5.10547 12.25M12.1055 12.25L12.1055 19.2499M12.1055 12.25L19.1055 12.25\"\n                    stroke=\"#353646\"\n                    stroke-width=\"1.5\"\n                    stroke-linecap=\"round\"\n                    stroke-linejoin=\"round\"\/><\/svg><\/span><\/summary><div class=\"faq-answer\">S\u00ed, aunque es m\u00e1s com\u00fan en trif\u00e1sicos. Solo necesitas verificar que el modelo sea compatible con ese tipo de conexi\u00f3n.<\/div><\/details><details class=\"faq-item\"><summary class=\"faq-summary\"><span class=\"faq-question\">\u00bfCu\u00e1ndo cambiar un rel\u00e9 t\u00e9rmico?<\/span><span class=\"faq-icon\"><svg xmlns=\"http:\/\/www.w3.org\/2000\/svg\"\n                    width=\"24\"\n                    height=\"24\"\n                    viewBox=\"0 0 24 24\"\n                    fill=\"none\"><path d=\"M12.1054 5.25L12.1055 12.25M12.1055 12.25L5.10547 12.25M12.1055 12.25L12.1055 19.2499M12.1055 12.25L19.1055 12.25\"\n                    stroke=\"#353646\"\n                    stroke-width=\"1.5\"\n                    stroke-linecap=\"round\"\n                    stroke-linejoin=\"round\"\/><\/svg><\/span><\/summary><div class=\"faq-answer\">Si el dispositivo dispara sin raz\u00f3n aparente, no rearma correctamente o ha estado expuesto a condiciones extremas. Revisar el estado es parte del mantenimiento preventivo.<\/div><\/details><\/div><br\/>\n<h2>Conclusi\u00f3n<\/h2>\n<p>El rel\u00e9 t\u00e9rmico es una herramienta fundamental para proteger motores el\u00e9ctricos de sobrecargas. Su correcta elecci\u00f3n e instalaci\u00f3n no solo alarga la vida \u00fatil de los equipos, sino que tambi\u00e9n evita costosas paradas de producci\u00f3n. Tras escuchar el an\u00e1lisis de un profesional, te aseguro que dedicar tiempo a elegir el rel\u00e9 correcto es una inversi\u00f3n en seguridad y eficiencia.<\/p>\n<p>Y si quieres llevar esa mentalidad de eficiencia tambi\u00e9n a tu factura de luz, en <strong>Gana Energ\u00eda<\/strong> tenemos tarifas de luz pensadas para que tu consumo sea siempre inteligente y sin complicaciones. Porque igual que proteges tu instalaci\u00f3n, proteger tu bolsillo tambi\u00e9n cuenta. Echa un vistazo a nuestras <a href=\"https:\/\/ganaenergia.com\/tarifas-luz\/\">tarifas de luz<\/a> y <a href=\"https:\/\/ganaenergia.com\/tarifas-gas\/\">tarifas de gas<\/a> y empieza a ahorrar energ\u00eda de la forma m\u00e1s pr\u00e1ctica.<\/p>\n\n\n<div class=\"kk-star-ratings kksr-auto kksr-align-left kksr-valign-bottom\"\n    data-payload='{&quot;align&quot;:&quot;left&quot;,&quot;id&quot;:&quot;19296&quot;,&quot;slug&quot;:&quot;default&quot;,&quot;valign&quot;:&quot;bottom&quot;,&quot;ignore&quot;:&quot;&quot;,&quot;reference&quot;:&quot;auto&quot;,&quot;class&quot;:&quot;&quot;,&quot;count&quot;:&quot;2&quot;,&quot;legendonly&quot;:&quot;&quot;,&quot;readonly&quot;:&quot;&quot;,&quot;score&quot;:&quot;4.5&quot;,&quot;starsonly&quot;:&quot;&quot;,&quot;best&quot;:&quot;5&quot;,&quot;gap&quot;:&quot;5&quot;,&quot;greet&quot;:&quot;Punt\u00faa este Post&quot;,&quot;legend&quot;:&quot;4.5\\\/5 - (2 votos)&quot;,&quot;size&quot;:&quot;20&quot;,&quot;title&quot;:&quot;Rel\u00e9 t\u00e9rmico: \u00bfQu\u00e9 es, c\u00f3mo funciona y c\u00f3mo elegir el adecuado?&quot;,&quot;width&quot;:&quot;110&quot;,&quot;_legend&quot;:&quot;{score}\\\/{best} - ({count} {votes})&quot;,&quot;font_factor&quot;:&quot;1.25&quot;}'>\n            \n<div class=\"kksr-stars\">\n    \n<div class=\"kksr-stars-inactive\">\n            <div class=\"kksr-star\" data-star=\"1\" style=\"padding-right: 5px\">\n            \n\n<div class=\"kksr-icon\" style=\"width: 20px; height: 20px;\"><\/div>\n        <\/div>\n            <div class=\"kksr-star\" data-star=\"2\" style=\"padding-right: 5px\">\n            \n\n<div class=\"kksr-icon\" style=\"width: 20px; height: 20px;\"><\/div>\n        <\/div>\n            <div class=\"kksr-star\" data-star=\"3\" style=\"padding-right: 5px\">\n            \n\n<div class=\"kksr-icon\" style=\"width: 20px; height: 20px;\"><\/div>\n        <\/div>\n            <div class=\"kksr-star\" data-star=\"4\" style=\"padding-right: 5px\">\n            \n\n<div class=\"kksr-icon\" style=\"width: 20px; height: 20px;\"><\/div>\n        <\/div>\n            <div class=\"kksr-star\" data-star=\"5\" style=\"padding-right: 5px\">\n            \n\n<div class=\"kksr-icon\" style=\"width: 20px; height: 20px;\"><\/div>\n        <\/div>\n    <\/div>\n    \n<div class=\"kksr-stars-active\" style=\"width: 110px;\">\n            <div class=\"kksr-star\" style=\"padding-right: 5px\">\n            \n\n<div class=\"kksr-icon\" style=\"width: 20px; height: 20px;\"><\/div>\n        <\/div>\n            <div class=\"kksr-star\" style=\"padding-right: 5px\">\n            \n\n<div class=\"kksr-icon\" style=\"width: 20px; height: 20px;\"><\/div>\n        <\/div>\n            <div class=\"kksr-star\" style=\"padding-right: 5px\">\n            \n\n<div class=\"kksr-icon\" style=\"width: 20px; height: 20px;\"><\/div>\n        <\/div>\n            <div class=\"kksr-star\" style=\"padding-right: 5px\">\n            \n\n<div class=\"kksr-icon\" style=\"width: 20px; height: 20px;\"><\/div>\n        <\/div>\n            <div class=\"kksr-star\" style=\"padding-right: 5px\">\n            \n\n<div class=\"kksr-icon\" style=\"width: 20px; height: 20px;\"><\/div>\n        <\/div>\n    <\/div>\n<\/div>\n                \n\n<div class=\"kksr-legend\" style=\"font-size: 16px;\">\n            4.5\/5 - (2 votos)    <\/div>\n    <\/div>\n","protected":false},"excerpt":{"rendered":"<p>Si alguna vez has tenido que proteger un motor el\u00e9ctrico de sobrecalentamientos o paradas inesperadas, es muy probable que te hayas topado con un rel\u00e9 t\u00e9rmico.<\/p>\n","protected":false},"author":26,"featured_media":22469,"comment_status":"open","ping_status":"open","sticky":false,"template":"","format":"standard","meta":{"_acf_changed":false,"footnotes":""},"categories":[875],"tags":[872],"class_list":["post-19296","post","type-post","status-publish","format-standard","has-post-thumbnail","hentry","category-luz","tag-destacado-principal"],"acf":[],"yoast_head":"<!-- This site is optimized with the Yoast SEO Premium plugin v28.0 (Yoast SEO v28.0) - https:\/\/yoast.com\/product\/yoast-seo-premium-wordpress\/ -->\n<title>\u00bfQu\u00e9 es un rel\u00e9 t\u00e9rmico y c\u00f3mo funciona? - Gu\u00eda 2026<\/title>\n<meta name=\"description\" content=\"Descubre qu\u00e9 es un rel\u00e9 t\u00e9rmico, c\u00f3mo protege motores el\u00e9ctricos de sobrecargas y qu\u00e9 factores considerar para elegir el modelo ideal. 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