Detailed Introduction of Four Typical Circuits of Varistor(II)

3) Application circuit between switch contacts

In the circuit, it is assumed that R1 is a varistor, which is connected between the two contacts of the power switch S1 to absorb the arc when the switch is disconnected and to prevent the switch contact from burning out by the arc.

4) Protect semiconductor device circuit

Varistors are used to protect semiconductor device circuits. In the circuit, it is assumed that R1 is a varistor, which is connected between the transistor VT1 collector and emitter to prevent the voltage between the VT1 collector and emitter from damaging the transistor.

This protection circuit can also be used in semiconductor devices such as thyristors, high-power transistors, etc. It is an effective protection circuit for semiconductor devices to limit the voltage level below the protected device.