The Lot of 9 Bussmann FNA-3 Dual Element Fuse is a set of snap-in electrical fuses designed for interior use. These D-Type cartridge fuses have a maximum amperage of 125A and are suitable for circuits with 41-50 poles. The fuses have a tripping characteristic of Type K, a time-delay/slow-blow fuse speed, and are compatible with AC current type. Made of fiberglass/glass-reinforced plastic, these fuses provide protection for electrical equipment and supplies in a variety of industrial and commercial settings.