ZW20F-12 outdoor high voltage vacuum Circuit Breaker (watchdog switch) is an outdoor power distribution equipment with rated voltage of 12KV and three-phase AC 50 Hz. When the internal fault occurs in the user of the T-connection of the 12KV distribution line, or it occurs inside the user's incoming switch, but the protection action time limit and the substation outlet switch are improper protection, the substation outlet switch will be opened. If the fault is permanent and the substation coincides unsuccessully, an accident in the medium voltage user community will power down the entire distribution trunk.This kind of common accident in the power grid will cause great losses to society. ZW20F -12 outdoor high voltage Vacuum Circuit Breaker (watchdog switch), installed in the responsbility boundary of the overhead distribution line, which is the front end of the user's incoming line, will automatically remove the single- phase ground fault and the phase-to -phase short-circuit fault within the user, avoiding the faults in the user's boundary and the power transmission trunk, and ensuring the safety of the non-faulty users,to improve the reliability of electricity consumption.

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