Our product varistor cover is to protect the varistor.
Varistor "is a kind of resistance device with nonlinear volt-ampere characteristics. It is mainly used for voltage clamping when the circuit is subjected to overvoltage and absorbs excess current to protect sensitive devices. The resistor body of a varistor The material is a semiconductor, so it is a variety of semiconductor resistors. Nowadays, the "zinc oxide" (ZnO) varistor is widely used, and its main material is the divalent element zinc (Zn) and the hexavalent element oxygen (O) So from the point of view of materials, zinc oxide varistor is a kind of "II-VI group oxide semiconductor". In Taiwan, a varistor is called a "surge absorber", sometimes also called an "electric shock (surge) suppressor (absorber)".
Utilizing 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 realizing the protection of the subsequent circuit. The main parameters of varistor are: varistor voltage, current capacity, junction capacitance, response time, etc.
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