Metal Oxide Varistor Circuit

The circuit we will build is shown below.

Metal oxide varistor circuit.

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. The components needed to build this circuit are shown below. This mov circuit will clamp up to 300vac if a power surge allowing transients into the circuit were to be that high. Metal oxide varistors and multi layered varistors.

Varistors are voltage dependent nonlinear devices which have electrical characteristics similar to back to back zener diodes. The energy of the incoming surge is partially conducted and partially absorbed protecting the circuit. 300vac metal oxide varistor. Metal oxide varistors movs are available in a variety of form factors and sizes for a broad range of applications.

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. The main components used to protect the circuit are fuse and varistor. The most common type is the mov or metal oxide varistor. When the circuit is exposed to a high voltage transient the varistor starts to conduct and clamps the transient voltage to a safe level.

The metal oxide varistor is designed to protect various types of electronic devices and semiconductor elements from switching and induced lightning surges. They are available in many values for specific voltage ranges. Metal oxide varistor circuit. 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.

The most common modern type of varistor is the metal oxide varistor mov. Metal oxide varistors or mov s are typically made from a small disk shaped metal zinc oxide material. The metal oxide varistor or mov is. The component starts conducting as soon as the voltage across it reaches the threshold voltage.

The radial leaded disc type is the most common version. First let us consider the component to have an open circuit as shown in figure 1 a. The metal oxide varistor or mov is a voltage dependent nonlinear device that provides excellent transient voltage suppression. The boundary between each grain and a neighbor forms a diode junction which allows.

The circuit of the mov is shown below. These two are connected in parallel to the protected circuit. Working of metal oxide varistor mov working of metal oxide varistor mov the working of a mov is shown in the figure above. The resistance of the mov is very high.