... & Full iron plated-copper 4.CE .excellent qualityporcelain knife switch 3P100AD 1, Factory directly . 2, CE , RoHS approved 3, manufacturer ... 4, single/double throwCeramic knife switch with 3 pole1. Doulbe/ ... Colors: yellow or other cover;Knife switch,single/double throw switch,push button switch,electrical switch.1.Fuction :it is used to ...