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]

Nov 27, 2025 · Varistors are composed of semiconductor elements that provide overvoltage protection in a circuit. Their functionality is similar to a Zener diode, allowing voltages below the limit to pass …

Jul 23, 2025 · A Varistor is an electronic component designed to protect electrical circuits from excessive voltage surges or transients. It is a nonlinear resistor whose electrical resistance varies significantly …

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.

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 are …

Nov 8, 2025 · The solution to mitigating transient voltage spikes is a component known as a varistor, which is an acronym for variable resistor. This device is a non-linear, voltage-dependent resistor …

Aug 15, 2025 · This article delves into the varistor’s symbol, characteristics, types, working principles, and testing methods, providing a comprehensive guide to this essential electronic component.

Oct 1, 2025 · Just as thermistors the varistor is fabricated from a compressed and sintered powder compound that consists of silicon carbide (SiC) or zinc oxide (ZnO). The ZnO varistor has superior …

In this project, we go over how to build a simple varistor circuit so that it can protect sensitive electronics from excess voltage.

A varistor is a blend of the words “varying resistor” because its resistance varies as the voltage applied to it changes. At low applied voltages, the varistor’s resistance is high, and as the applied voltage …