#circuit breakers are prone to misoperation under the impact of surge. The surge withstand capacity is low. In order to obtain higher surge

[zhejiangleihaoelectric]

Function of backup protection device Folding advantages The backup protection devices of traditional surge protective devices are mostly circuit breakers and fuses. As backup protection devices, circuit breakers are prone to misoperation under the impact of surge. The surge withstand capacity is low. In order to obtain higher surge withstand capacity, the selected rated current will be relatively large, which will result in the inability to break the short circuit current to ground. The withstand capacity of fuse with the same rated current is lower than that of circuit breaker, and there is also the problem of larger selected rated current. SCB (special backup protection device for surge protector), as a new generation of backup protection device for surge protector, has strong breaking capacity and higher surge withstand capacity, and its short-circuit action current is far lower than the traditional backup protection device under the condition of considering both breaking capacity and surge endurance. It can effectively break the low short-circuit current and provide more sophisticated short-circuit protection for the surge protector.