... 4.all kinds of electric current Porcelain knife switch 1)The specification:2P60AD,2P20A,2P30A,2P60A, 2p100A ... speclizes in porcelain lampholder, fuse unit,knife switch.Porcelain Knife switch are made of porcelain, which are ... porcelain knife switch,power knife switch,single/double throw isolating switch knife switch; Produce namedouble throw porcelain knife switch 2PMaterials:Bodyporcelain Knifeiron ...