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 polymers, …

1 day ago · Learn how varistors protect circuits from voltage spikes, understand their operation, and discover where they are most effectively applied.

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 commonly …

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 protect …

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 …

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 …

Varistors provide reliable and economical protection against high voltage transients and surges which may be produced, for example, by lightning, switching or electrical noise on AC or DC power lines.

Jun 16, 2024 · Varistors, also known as Voltage Dependent Resistors (VDRs), are essential components used to protect electronic circuits from voltage surges and spikes.