The performance of varistor is related to quality

The varistor is a non-linear resistance element with zinc oxide as its main component. The surge current tolerance and nonlinear coefficient of the device are very large. When the threshold voltage is lower than the threshold voltage, the resistance is very high, and almost no current flows. If the threshold voltage is exceeded. The resistance is drastically reduced, and the amplified current can be discharged. Due to this characteristic, as a protective element for electronic and electrical equipment, the absorption of abnormal voltage and the absorption of lightning surges play a large role.

The varistor is generally used in parallel in the circuit. When the voltage across the resistor changes abruptly, the short circuit of the resistor blows the current fuse to protect it. Varistors are used in circuits and are often used for power supply overvoltage protection and regulation. Since the varistor has a large parasitic capacitance, it is used in an AC power system, and a considerable leakage current is generated. When the varistor with poor performance is used for a period of time, the leakage current may become hot due to the leakage current becoming large.

The quality of the varistor is related to performance. Therefore, when purchasing the varistor, we have to purchase it from a regular manufacturer. The advantage is that it can extend the life of the resistor and reduce unnecessary trouble.