Electrical Porcelain Knife Switch 1)3P30AS 600V 2) iron,copper, zinc alloy 3)Safe usage, good quality & low factory ... base and handle,inner accessories :copper or aluminium availableis in iron,copper, zinc alloy etc.or can be customised3.Different sizes ... throw3020A4PCS24/2236*30*36 low factory price 3P30AS porcelain knife switch