... service 3.double knife or more 1) Item name: knife switch ;2) Materials:Body: porcelain base and bakelite coverKnife: iron copper ... : 2P20,2P30,2P60,2P100: 3P20,3P30.3P60,3P1004)Electrucal specifications: Voltage:100-600V Electric current:20A,30A,60A,100A5) Colour: yellow ... carton or acconding to the customer's requirement porcelain knife switch