1)YCW1 Series Air Circuit Breaker 2)AC 50Hz rated voltage 400V,690V 3) ... Breaker CNC, Changcheng- China Famous Brandwww.cncelegroup.com YCW1 series intelligent air circuit breaker (hereinafter called ACCBS) are applied to the network ... conform to IEC60947-2, IEC 60947-4 standards. YCW1 Series Air Circuit Breaker