1)YCW1 Series Air Circuit Breaker 2)AC 50Hz rated voltage 400V, ... day 4)CE,CB,ISO9001,14001,IEC 5)OEM YCW1 Series Air Circuit Breaker CNC, Changcheng- China Famous Brandwww.cncelegroup.com ... . The ACBS has intelligent protection function and the key parts adopt intelligent release. The release can make the accurate selective ... conform to IEC60947-2, IEC 60947-4 standards. YCW1 Series Air Circuit Breaker