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 …

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 polymers, …

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 …

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 …

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 …

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 …

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 …

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 …

Oct 26, 2023 · At normal voltage levels, a varistor behaves like an insulator, allowing minimal current to pass through. However, when voltage surpasses a certain threshold, the varistor transforms into a …