The Lot of 10 Bussmann FNM-15 Time Delay Fuses are plug-in/snap-in cartridge fuses with a maximum amperage of 250A. These D-Type cartridge fuses are suitable for interior use and feature thermal overload protection. With a tripping characteristic of Type A and a time-delay/slow-blow fuse speed, these fuses are ideal for electrical equipment and supplies in a variety of industrial and commercial settings. The Bussmann brand ensures quality and reliability in electrical protection.