Varistor

A metal oxide varistor (MOV) is an electronic component that is used to protect electrical circuits and devices from voltage spikes or surges. It is a type of voltage-dependent resistor (VDR) made from a ceramic material that contains metal oxide particles.

The resistance of an MOV is high when the applied voltage is below a certain level, called the threshold voltage. When the voltage exceeds the threshold voltage, the resistance of the MOV rapidly decreases, allowing it to conduct current and absorb the excess energy from the surge.

MOV devices are commonly used in power supplies, surge protectors, and other electronic equipment to protect against voltage spikes caused by lightning strikes, power outages, and other electrical disturbances. They are available in a range of sizes and voltage ratings, and can be used in both AC and DC circuits.

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