SUBW1 series intelligent universal circuit breaker (hereinafter referred to as circuit breaker) is suitable for distribution of electric energy and protection circuit and power supply in distribution network with AC 50Hz, rated voltage up to 660V (690V) and below, rated current 200A~6300A. The equipment is protected from overload, undervoltage, short circuit, single phase grounding and other faults. The circuit breaker has intelligent protection function, and the selective protection is accurate, which can improve the reliability of power supply and avoid unnecessary power failure. At the same time, with an open communication interface, "four remote" can be carried out to meet the requirements of the control center and automation system. The circuit breaker has a pulse withstand voltage of 8000V at an altitude of 2000 meters (the altitude is corrected according to the standard, and the maximum is not more than 12000V). The circuit breaker does not have an intelligent controller and the sensor can be used as an isolator, marked as ＿/ l－x－. The circuit breaker complies with GB14048.2 "Low-voltage switchgear and control equipment low-voltage circuit breaker" and IEC60947-2 "Low-voltage switchgear and control equipment circuit breaker" and other standards.