Varistor is a pressure limiting protection device. The nonlinear properties of varistor, when overvoltage appears in the varistor varistor between electrodes, the voltage can be clamped to a fixed voltage value, so as to realize the protection of the secondary circuit. The main parameters of varistors are: varistor voltage, current capacity, junction capacitance, response time. Main applications: power supply system, surge suppressors, security system, motor protection, automotive electronic systems, home appliances etc..