"A fuse from Bussmann is the most essential fuse for both commercial and industrial needs. With fast acting fuse speed, 400A fuse amps, an interrupt rating of 200kA at 250VAC, 100kA at 250VDC, and ktn-r series, this fuse is a must-have. The voltage rating is 250vac/dc. When it comes to product classification, this item can be grouped as RK1. It has a single element. As far as size goes, it is 2-1/16"" in diameter. It is a nonindicating fuse. Functionally equal to Mersen/Ferraz Shawmut A2K-R, Littelfuse KLNR, you'll thoroughly enjoy its use. The body is made of melamine material. Standards include: CE, UL 248-12 Guide JDDZ, File E4273, CSA C22.2 No. 248.12, Class 1422-02, File 53787.FeaturesElement: SingleFuse Amps: 400AItem: FuseLength: 8-5/8""Body Material: MelamineBody Style: BladeClass: RK1Series: KTN-RFunctionally Equal To: Mersen/Ferraz Shawmut A2K-R, Littelfuse KLNRStandards: CE, UL 248-12 Guide JDDZ, File E4273, CSA C22.2 No. 248.12, Class 1422-02, File 53787Diameter: 2-1/16""Indicating / Nonindicating: NonindicatingRejection / Nonrejection: RejectionFuse Voltage Rating: 250VAC/DCFuse Speed: Fast ActingFuse Interrupt Rating: 200kA at 250VAC, 100kA at 250VDC"