Metal Oxide Varistor

They are composed primarily of z n o with small additions of other metal oxides such as bismuth cobalt magnese and others.

Metal oxide varistor.

It is called so as the component is made from a mixture of zinc oxide and other metal oxides like cobalt manganese and so on and is kept intact between two electrodes which are basically metal plates. But not like a potentiometer its resistance will change automatically depending on its voltage. There is no polarity for these leads and hence can be connected in both directions. It is also a non linear device and provides very good transient voltage surge protection.

The boundary between each grain and a neighbor forms a diode junction which allows. Once the voltage across the varistor increases the resistance will be decreased. Basic operation electrical characteristics and applications will be discussed. Metal oxide varistors are also connected in series to supply high voltage ratings.

The metal oxide varistor or mov is a voltage dependent nonlinear device that provides excellent transient voltage suppression. This type contains a ceramic mass of zinc oxide grains in a matrix of other metal oxides such as small amounts of bismuth cobalt manganese oxides sandwiched between two metal plates which constitute the electrodes of the device. This tutorial will provide an introduction to metal oxide varistors and mov product offerings from littelfuse. The term mov or metal oxide varistor is a variable resistor.

A metal oxide varistor mov is a protection component used in power supply circuits that is powered directly from ac mains it is used to protect the circuit from high voltage spikes by varying its resistance. When a high current passes through a mov its resistance value decreases and acts as a short. Metal oxide varistor is a voltage dependent resistor. The most common modern type of varistor is the metal oxide varistor mov.

Metal oxide varistor mov to overcome the limitations of semiconductor based varistors like silicon carbide varistors the metal oxide varistors mov have been developed. Metal oxide varistors are similar to resistors and has only two leads. The metal oxide varistor or mov is. There will also be a presentation of the different mov products littlefuse brings to the marketplace.

Mov is the most commonly used type of varistor. The metal oxide varistor is designed to protect various types of electronic devices and semiconductor elements from switching and induced lightning surges. Metal oxide varistors consist of approximately 90 zinc oxide as a ceramic base material plus other filler materials for the formation of junctions. A metal oxide varistor or mov is the blue or orange colored circular component that you can commonly spot on the ac input side of any power supply circuit the metal oxide varistor can be considered as another type of variable resistor that can vary its resistance based on the applied voltage across it.

Metal oxide varistors and multi layered varistors. Varistors are voltage dependent nonlinear devices which have electrical characteristics similar to back to back zener diodes.