The XKW1 series intelligent universal circuit breaker (hereinafter referred to as the circuit breaker) is suitable for the AC 50Hz distribution network with a rated working voltage up to AC 690V and below, and a rated current of 400A to 6300A. It is used to distribute electrical energy and protect lines and power equipment from the hazards of overload, undervoltage, short circuit, single-phase grounding and other faults.