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What are the functions of varistor

Release time:

2022-12-02 09:47

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1. "Varistor" is a kind of resistance device with nonlinear voltage-ampere characteristics. Resistor is generally directly called resistance in daily life. It is a current-limiting element. After the resistor is connected to the circuit, the resistance value of the resistor is fixed, usually two pins, which can limit the current through the branch it is connected to.

2. The response time of the varistor is ns, which is faster than the air discharge tube and slightly slower than the TVS tube. Generally, the response speed of the varistor used for overvoltage protection of electronic circuits can meet the requirements. Overvoltage refers to the long-term voltage change phenomenon that the root-mean-square value of AC voltage increases at power frequency, exceeds 10% of the rated value, and lasts for more than 1 minute. It belongs to an electromagnetic disturbance phenomenon in the power system.

3. The voltage/current acting on the varistor should be different according to the purpose of applying the varistor in different applications, so the requirements for the varistor are also different. It is important to distinguish this difference for correct use. Varistors can be divided into two categories: ① varistors for protection and ② varistors for circuit functions.

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