Metal Oxide Varistor Circuit

First let us consider the component to have an open circuit as shown in figure 1 a.

Metal oxide varistor circuit.

They are composed primarily of z n o with small additions of other metal oxides such as bismuth cobalt magnese and others. Metal oxide varistors or mov s are typically made from a small disk shaped metal zinc oxide material. The most common type is the mov or metal oxide varistor. The metal oxide varistor is designed to protect various types of electronic devices and semiconductor elements from switching and induced lightning surges.

These two are connected in parallel to the protected circuit. The circuit of the mov is shown below. Working of metal oxide varistor mov working of metal oxide varistor mov the working of a mov is shown in the figure above. When the circuit is exposed to a high voltage transient the varistor starts to conduct and clamps the transient voltage to a safe level.

Metal oxide varistors and multi layered varistors. The most common modern type of varistor is the metal oxide varistor mov. When a high current passes through a mov its resistance value decreases and acts as a short. The boundary between each grain and a neighbor forms a diode junction which allows.

They are available in many values for specific voltage ranges. Metal oxide varistors movs are available in a variety of form factors and sizes for a broad range of applications. 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. An mov s voltage rating called the varistor voltage is the voltage across a varistor when a current of 1ma is passed through the device.

Varistors are voltage dependent nonlinear devices which have electrical characteristics similar to back to back zener diodes. A metal oxide varistor is frequently used in different circuits along with a fuse. The circuit we will build is shown below. The components needed to build this circuit are shown below.

The resistance of the mov is very high. The component starts conducting as soon as the voltage across it reaches the threshold voltage. This mov circuit will clamp up to 300vac if a power surge allowing transients into the circuit were to be that high. Metal oxide varistor circuit.

The metal oxide varistor or mov is. The metal oxide varistor or mov is a voltage dependent nonlinear device that provides excellent transient voltage suppression. 300vac metal oxide varistor. The main components used to protect the circuit are fuse and varistor.