... CB,ISO9001,14001,IEC 5)OEM YCW1 Series Air Circuit Breaker CNC, Changcheng- China Famous Brandwww.cncelegroup.com ... used foe distributing energy and protecting the circuit and power supply device against short-circuit, under-voltage, single-phase ground fault ... power and improve the reliability of power supply.ApplicationThe products conform to IEC60947-2, IEC 60947-4 standards. YCW1 Series Air Circuit ...