A varistor (a.k.a. voltage-dependent resistor (VDR)) is a surge protecting electronic component with an electrical resistance that varies with the applied voltage. [2]

Aug 21, 2020 · The most common varistor is a metal oxide varistor (MOV), which contains a ceramic block composed of zinc oxide particles and a small number of other metal oxides or …

Nov 27, 2025 · Learn what varistors are, how they work and where they are used to protect circuits from voltage surges in modern electronic designs.

Aug 15, 2025 · A varistor is a device with a nonlinear voltage-current characteristic. It is primarily used to clamp voltage when a circuit is subjected to overvoltage, absorb excess current, and …

Jul 23, 2025 · What is a Varistor? A varistor is an electronic component that protects electrical circuits against overvoltage. Because its electrical resistance varies with applied voltage, it is …

Varistors are nonlinear two-element semiconductors that drop in resistance as voltage increases. Voltage dependent resistors are often used as surge suppressors for sensitive circuits. Here …

Unlike the fuse or circuit breaker which offers over-current protection, the varistor provides over-voltage protection by means of voltage-clamping in a similar way to the zener diode.

Jun 13, 2025 · A varistor is a special type of resistor that changes its resistance depending on the voltage applied across it. When the voltage stays within normal limits, the varistor acts like an …

Varistor - A varistor is a variable resistor made from semiconductor material, which is able to change its electrical resistance depending on the voltage applied to it. The principle of …

What is a Varistor? A varistor is an electrical component that protects circuits from sudden voltage surges. The word comes from “voltage-dependent resistor,” which describes how it works: its …