M81582/04-B is a part manufactured by Bel Fuse, a company specializing in the manufacture of electrical components. It is a type 1, Class F, fuse block. This part has two pieces, an in-line fuse holder, and a terminal block. The in-line fuse holder has two 1/4 inch diameter barrel socket ports and a 1/4 inch round tab connection port. The terminal block has a single tab and two terminal screws, where the input and output wires can be connected. This part is designed for environments with a maximum temperature of 105°C, and an ambient temperature of -55°C to 85°C. It is UL recognized, CSA certified, and RoHS compliant.