Voltage Switching Surge Protector

Voltage switch type surge protective device. It presents high impedance when there is no transient overvoltage. Once it responds to lightning transient overvoltage, the impedance surge protector suddenly changes to low impedance, allowing lightning current to pass. It is also called "short-circuit switch type surge protection device".

Even when a significant amount of lightning energy is absorbed by the first-stage surge protector, some energy, too great for the equipment or third-stage surge protector, is still transmitted and needs to be further absorbed by the second-stage surge protector. Simultaneously, the transmission line passing through the first-stage surge protector will also be induced by the lightning electromagnetic pulse radiation. When the line is long enough, the induced lightning energy becomes large enough that the second-stage surge protector is required to further dissipate the lightning energy.