The Lot of 9 Bussmann Fusetron FRN-R-4 Dual Element Class RK5 Fuses are clip-on cartridge fuses designed for interior use in electrical equipment and supplies. With a maximum amperage of 250A and thermal overload protection, these fuses are suitable for single-phase systems and provide short circuit protection. Crafted in the United States, these fuses come in a pack of 9 and feature a copper finish. Ideal for various circuit applications, these fuses offer reliable on/off operation and current-limiting capabilities, making them a dependable choice for industrial and commercial settings.