Knife Switch 1.Double/single throw 2.Good quality and fast delivery time 3.Porcelain ,Full copper, Zinc Alloy 4.Cheapest Porcelain knife switch 20A 1. Single throw2. rated voltage 110~600v .3. Electric current: 20A, 30A, 60A and 100A;4. Double throw, part number includes: 2P20, 2P30, 2P60 and 2P100; 3P20, 3P30, 3P60 and 3P100,3P200A; 4p60, 4p100; Fuse knife switch,three pole knife switch