Metal Oxide Varistor Circuit

The energy of the incoming surge is partially conducted and partially absorbed protecting the circuit.

Metal oxide varistor circuit.

The circuit we will build is shown below. Varistors are voltage dependent nonlinear devices which have electrical characteristics similar to back to back zener diodes. These two are connected in parallel to the protected circuit. Metal oxide varistor circuit.

Metal oxide varistors or mov s are typically made from a small disk shaped metal zinc oxide material. The main components used to protect the circuit are fuse and varistor. Metal oxide varistors and multi layered varistors. The component starts conducting as soon as the voltage across it reaches the threshold voltage.

300vac metal oxide varistor. First let us consider the component to have an open circuit as shown in figure 1 a. 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. They are composed primarily of z n o with small additions of other metal oxides such as bismuth cobalt magnese and others.

The boundary between each grain and a neighbor forms a diode junction which allows. Metal oxide varistors movs are available in a variety of form factors and sizes for a broad range of applications. The metal oxide varistor or mov is. The circuit of the mov is shown below.

The resistance of the mov is very high. 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 most common type is the mov or metal oxide varistor. The most common modern type of varistor is the metal oxide varistor mov.

The components needed to build this circuit are shown below. When a high current passes through a mov its resistance value decreases and acts as a short. 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.

They are available in many values for specific voltage ranges. A metal oxide varistor is frequently used in different circuits along with a fuse. The metal oxide varistor is designed to protect various types of electronic devices and semiconductor elements from switching and induced lightning surges. The radial leaded disc type is the most common version.