In the distribution network with AC 50Hz, rated voltage up to 400V, 690V and rated current 630A-6300A, this product is used to distribute electric energy and protect the circuit and power equipments from hazards of overload, undervoltage, short circuit, single-phase grounding. It has intelligent protection functions and precise selective protection, which can enhance the reliability of power supply and avoid unnecessary power outage. This circuit breaker has a open communication interface to realize “four-remotes”, so as to meet the demands of the control center and automation system. It has no intelligent controllers and sensors, and can be used as an isolator.