Metal Oxide Varistors (MOV) / ZNR (Zinc Oxide Non-Linear Resistor)

ZNR stands for Zinc Oxide Non-linear Resistor. MOV devices are used to protect electronic equipment against voltage transients and surges. For example, a ZNR can protect circuits against a surge, such as lightning. The equivalent electrical circuit of the MOV would be back-to back Zener Diodes and a parallel connected Capacitor, that’s one MOV doing the job of three components. Metal Oxide Varistors can save board space and cost.

Panasonic discovered the ZNR Surge Absorber function in 1968 and was a pioneer in the use of Zinc Oxide as a Surge Absorber. Panasonic Metal Oxide Varistors are one of the top brands of Surge Absorbers and have been for over 40 years.