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What is a Metal Oxide Varistor (MOV) and how does it work?

April 26, 2017metal mov oxide varistor

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What is a Metal Oxide Varistor (MOV) and how does it work?

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A MOV is a sintered ceramic component with a suspended metal oxide screen. It acts much like a solid state switch, creating a low impedance path to ground. It is voltage dependent and begins to conduct when voltage on one surface exceeds a given threshold. This threshold is determined by the thickness of the component. The opposite side of the MOV is connected to the ground.