Where should I cut off the power supply to replace the universal circuit breaker?

With the development of social science, technology and economy, people have higher and higher requirements for the stability and safety of electricity consumption. Universal circuit breakers are widely used in property power supply equipment of high-rise buildings, generally used as low-voltage main switches or high-capacity branch circuit switches, and play an important role in building power supply. Once a fault occurs, it will cause a large area of power failure. Through some examples in maintenance work, this paper expounds the fault analysis and treatment methods of universal circuit breaker in operation. ?

Button failure: mechanical failure of the button or poor contact of the wire contact will make the trip circuit impassable, resulting in no electricity in the shunt trip coil, failure of armature suction and failure of circuit breaker. Optional replacement button switch.

Faults of shunt tripping device: open circuit or short circuit of shunt tripping coil, and obstacles in attracting armature all affect the tripping of circuit breaker. Therefore, it is necessary to check the shunt release regularly, remove the obstacles that affect the armature attraction, and replace the open-circuit or short-circuit coil in time to ensure that the circuit breaker can break quickly when it needs to break the circuit.