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What is a metal oxide varistor?

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Quick Answer

A metal oxide varistor is a commonly used component that protects heavy electronic devices from voltage surges. It also causes the machine to short circuit rather than cause damage to the machine. A metal oxide varistor is made by combining zinc oxide and metal oxides, such as manganese and cobalt.

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Full Answer

Metal oxide varistors are typically placed between two metal plates that serve as electrodes. When it is produced, a metal oxide varistor is rated for a certain number of uses. If a device is shorted above the varistor's rating, the metal oxide can begin to deteriorate, making a replacement necessary.

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