SY557 porcelain fuse unit 1.30A,380- 500V 2.stability, anti-aging, high temperature resistance 3.low factory price Low factory price ! RCIA porcelain fuse unitfuse , fuse unit, fuse holder, porcelain fuse unit, ceramic fuse , porcelain fuse,30amp fuse 1. Material: porcelain, accessories: copper, iron, aluminum, iron with zinc or nickel plated, also can be customized.2.Type :30A,380-500V3. ...