KCW1 series universal type breaker ,hereinafter referred to as the main breaker is suitable for use in ac rated voltage isolator, working for 400V, 690V, rated current of the 6300A ~ for 400A in distribution network, distributed power and protect circuit and power equipment from overload, voltage, short circuit and grounding faults. 630A and below the motor can be used as a circuit breaker overload, owe voltage and short circuit protection. Circuit breaker using intelligent core components tripping device, which can protect the selectivity, avoiding unnecessary power, to improve the power supply reliability, safety and continuity. Product 14048.2 GB, GB 14048.4 and IEC 60947-2, 4-60947 IEC standard.