Varistor
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A varistor is a surge protecting electronic component with an electrical resistance that varies with the applied voltage. It has a nonlinear, non-ohmic current–voltage characteristic that is similar t
Metal-oxide varistor manufactured by Siemens & Halske AG.
Western Electric 3B varistor made in 1952 for use as click suppressor in telephone sets
Western Electric Type 44A varistor for click suppression, mounted on a U1 telephone receiver element manufactured in 1958.
High voltage varistor
Surge protector
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A surge protector, spike suppressor, surge suppressor, surge diverter, surge protection device, transient voltage suppressor, or transient voltage surge suppressor is an appliance or device intended t
Varistor
…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. It has a nonlinear, non-ohmic current–voltage characteristic…
Surge protection device (SPD) for installation in a low-voltage distribution system
A power strip with built-in surge protector and multiple outlets
A whole house surge protector installed on a household electrical circuit breaker panelboard in 2012; this surge arrester provides protection to all the household electronic devices. Two green lamps indicate that the metal-oxide varistors in the unit are still functional.
Surge arresters