{"id":242,"count":19,"description":"Thermally protected varistors are a combination of varistors (MOVs) and thermal protection devices (thermal fuses). As varistors age and are subjected to increasing overvoltages, they degrade and leakage current increases. Furthermore, leakage currents result in power losses and cause corrosion in grounding systems. If a varistor operates near its threshold voltage for an extended period, it becomes very hot. This poses a fire hazard. For maximum protection, a thermal fuse is incorporated that trips in the event of overheating. This disconnects the varistor from the rest of the circuit or even disconnects the entire application from the power supply.      ","link":"https:\/\/www.alpha-therm.com\/en\/produkte\/overvoltage-protection\/thermally-protected-varistors\/","name":"Thermally protected varistors","slug":"thermally-protected-varistors","taxonomy":"product_cat","parent":281,"meta":[],"menu_order":34,"yoast_head":"<!-- This site is optimized with the Yoast SEO plugin v28.7 - https:\/\/yoast.com\/product\/yoast-seo-wordpress\/ -->\n<title>Thermally protected varistors - Alpha Therm<\/title>\n<meta name=\"robots\" content=\"index, follow, max-snippet:-1, max-image-preview:large, max-video-preview:-1\" \/>\n<link rel=\"canonical\" href=\"https:\/\/www.alpha-therm.com\/en\/produkte\/overvoltage-protection\/thermally-protected-varistors\/\" \/>\n<meta property=\"og:locale\" content=\"en_US\" \/>\n<meta property=\"og:type\" content=\"article\" \/>\n<meta property=\"og:title\" content=\"Thermally protected varistors - Alpha Therm\" \/>\n<meta property=\"og:description\" content=\"Thermally protected varistors are a combination of varistors (MOVs) and thermal protection devices (thermal fuses). As varistors age and are subjected to increasing overvoltages, they degrade and leakage current increases. Furthermore, leakage currents result in power losses and cause corrosion in grounding systems. If a varistor operates near its threshold voltage for an extended period, it becomes very hot. This poses a fire hazard. For maximum protection, a thermal fuse is incorporated that trips in the event of overheating. 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