![]() In the electrical or electronic circuits that varistors intend to protect, this energy may be released either in a predictable manner via controlled switching actions, or randomly induced into a circuit from external sources. In this context, “voltage transients” are defined as short-duration surges of electrical energy. Peak current ratings range from 20 to 70,000 A, while peak energy ratings range from 0.01 to 10, 000 J. They also offer a wide voltage range, high energy absorption, and fast response to voltage transients. Voltage TransientsVaristors feature high durability, which is essential for withstanding repeated high-peak pulse currents and high-energy surge transients. Essentially, these voltage-dependent, nonlinear devices have electrical characteristics similar to back-to- back Zener diodes. Varistors, also called metal-oxide varistors (MOVs), are used to protect sensitive circuits from a variety of overvoltage conditions.
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