The BK/HFB-R is a HFB-series 30A, 32VAC weatherproof cartridge In-line Fuse Holder with copper tin-plated crimp holder terminals, it features 18 to 12AWG copper wire, withstands many organic solvents and rigorous shock and vibration, high visibility, for use with 1/4 x 1-1/4 inch fuses. Ideal for water, salt spray, ultraviolet light, ozone harsh environments. RoHS compliant version.