The Edison JDL1 Class J fuse is a 600V fuse designed for use in electrical systems with high fault current levels. It is made of a ceramic body and silver-plated copper elements, which provide excellent electrical and thermal conductivity. It also features a time-delay characteristic, which allows it to clear moderate overloads without opening. This fuse is commonly used in industrial and commercial power distribution systems, including motor control centers, switchgear, and panelboards.