Q.What is the failure mode of a varistor?

Voltage / Current / Temperature Protection Devices >  Voltage Protection Devices >  Chip Varistors / Ceramic Transient Voltage Suppressors

A. The varistor short circuits when an overpotential caused by ESD or lightning surges is applied to it. When using a varistors this way, be careful to select one with good durability against repeated surges.

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