Intelligent universal circuit breaker (hereinafter referred to as circuit breaker), suitable for AC 50Hz, rated operating voltage 400V, 690V, rated current 630A-6300A distribution network; Mainly used to distribute power and protect lines and power equipment from overload, undervoltage, short circuit, single-phase grounding and other faults, the circuit breaker has a variety of intelligent protection functions, can be selective protection, and accurate action, avoid unnecessary power outage, improve power supply reliability.