Type of application of varistor in the circuit

The varistor is a voltage limiting type protection device. Using the non-linear characteristics of the varistor, when an overvoltage occurs between the two poles of the varistor, the varistor can clamp the voltage to a relatively fixed voltage value, thereby protecting the latter circuit. The main parameters of varistor are: varistor voltage, current capacity, junction capacitance, response time, etc. It is important to understand the parameters, types and applications of varistor.

Type 1: It is the connection between the power lines or between the power line and the earth. As a representative use case of the varistor, the signal line on the power line and the long distance encounters a lightning strike and the line has a surge pulse. Under the protection of electronic products. Generally, the varistor can be connected between the lines to induce pulses between the lines, and the varistor is connected between the line and the ground to induce pulses between the transmission line and the ground. If the line connection and the line connection are further combined, the surge pulse can be better absorbed.

Type 2: It is the connection in the load. It is mainly used to absorb the induced pulse caused by the sudden opening and closing of the inductive load to prevent the component from being damaged. Generally, it can be connected in parallel to the inductive load.

Type 3: It is the connection between the contacts. This connection is mainly to prevent the inductive charge switch contacts from being burned by the arc. Generally, the varistor is connected in parallel with the contacts.

Type 4: Mainly used for the protection connection of semiconductor devices. This connection method is mainly used for semiconductor devices such as thyristors and high-power transistors. Generally, it is connected in parallel with the protection device to restrict the voltage below the withstand voltage of the protected device. Grade, this is a good protection for semiconductor devices.

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