... 60HZ,Current :63-800A,Voltage:400V,500V,690V,800V.. YKM1 series of molded case circuit breaker (short for circuit breaker), is ... the latest circuit breaker of advanced technology. The insulation voltage is 800V, (YKM1-63: ... and infrequently starting. The circuit breaker have the functions of overload, short circuit and undervoltage protection which can protect ...