The Lot of 10 Bussmann Fusetron FNA-4 Dual Element Time Fuse is a set of electrical fuses designed for AC current type. With a time-delay/slow-blow fuse speed, these D-Type Cartridge fuses have a height of 2 inches and are suitable for single-phase electrical equipment. The Bussmann brand ensures quality and reliability in industrial settings, making these fuses a crucial component for maintaining the operation of electrical systems.