... .Standard 1.International Standard:1)IEC60947-1(1998)<Low Switch Voltage Equipment and Control Equipment, part one ... Rules>.2)IEC60947-3(1999)<Low Switch Voltage Equipment and Control Equipment, Switch, Isolator, Isolation switch, and Combined Electric Equipment ... /T 14048.3-2002 <Low Switch Voltage Equipment and Control Equipment, Switch, Isolation ,Isolation switch, and Combined Electric Equipment ...