The Marathon/Kulka 6J400A3BFBD is a robust Class J fuse holder engineered for demanding industrial applications. It features a phenolic laminate insulator base with a UL94 HB flammability rating and an operating temperature range of -35°C to 120°C. The fuse clip is constructed from tin-plated aluminum alloy, while terminal set screws and hardware utilize tin-plated aluminum and zinc-plated steel respectively. This fuse holder is approved for a 200,000 Amp Withstand Rating and is suitable for use with Class J fuses 201-400 Amps, accommodating wire ranges from 350 kcmil to #2 AWG. It is UL Listed and RoHS compliant, making it a reliable and environmentally responsible choice for various electrical systems.