What is varistor?
Using the non-linear characteristics of varistor, When the overvoltage occurs between the two poles of the varistor, The varistor can clamp the voltage to a relatively fixed voltage value, Absorbs excess voltage to protect sensitive devices. So as to achieve the protection of the post-stage circuit. Varistor resistance of the main parameters are: varistor voltage, flow capacity, junction capacitance, response time.
English name is called "Voltage Dependent Resistor" abbreviated as "VDR",Or "Varistor". The resistive material of the varistor is a semiconductor. So it is a variety of semiconductor resistors.Now widely used "zinc oxide" (ZnO) varistor, Its main material has a divalent element zinc (Zn) and hexavalent element oxygen (O) formed. So from the material point of view, The zinc oxide varistor is a "II-VI oxide semiconductor". The varistor is called a "surge absorber"Sometimes referred to as "electric shock (surge) suppressor (absorber)".