High reliability is paramount in our always on, hyper-connected world. Application downtime or failure runs the gamut from frustrating to incredibly expensive. That is why overvoltage protection remains a consistent requirement. Users expect seamless system operation so guarding them against unstable electrical service swells, switching, and lightning voltage transients just makes sense.
In the overvoltage protection component arsenal, Metal Oxide Varistors or MOVs are popular solutions. New MOVs boast high current handling, high current absorption, and fast reaction time to protect against transient faults up to their rated limits. Power supplies, power systems, line voltage, telecom systems, white goods, and appliances are among the applications using MOVs for protection. Unfortunately, they are susceptible to degradation and failure issues in certain harsh and uncontrolled environment applications. These problems are well-documented, and UL requires extensive testing to guard against harmful failure modes. An MOV failure can occur from a thermal runaway condition, which defines the lifespan of an MOV. Thermal runaway conditions could also increase the risk of fire in an MOV, prompting designs to typically require additional thermal cutoff or fusing devices for safety.
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