porcelain fuse unit voltage:250V,500V Electrical current: 15A,30A,60A,100A,200A Material:copper,iron or zinc alloy porcelain fuse unitMaterial: iron plated copper/copperconnector is copper or zinc alloy Electrical specification: voltage:250V,500V Electrical current: 15A,30A,60A,100A,200A. Porcelain Fuse Unit