The Lot of 10 Bussmann NON-1 One-Time Fuse is a set of electrical fuses designed for industrial applications. These plug-in fuses have a maximum amperage of 250A and are suitable for interior use. The D-Type Cartridge fuses are made of copper and are time-delay, slow-blow type with a voltage rating of 201-250V. With a smart home compatibility of universal, these NON-1 fuses are a reliable choice for protecting electrical equipment and supplies in a business or industrial setting. Made in the United States by the reputable brand Bussmann, these fuses offer a dependable operation method for on/off control.