The Lot of 10 Bussmann FNM-20 Time Delay Fuses are versatile electrical fuses suitable for interior use in any room. With a maximum amperage of 20A and voltage ranging from 201-250V, these cartridges are designed for AC current and offer overload protection. The panel and plug-in mounting style, along with their time-delay/slow-blow fuse speed, ensure reliable protection for electrical equipment and industrial machinery. With a waterproof resistance property, these fuses by Bussmann provide a safe and efficient solution for various electrical applications.