The 4512 is a single-pole fuse block manufactured by Bussmann Division (Cooper Industries) designed to accommodate 1/4 × 1 1/4 inch fuses. The fuse block features a compact design with overall dimensions of 3 inches in length and 2 7/16 inches in height, with a mounting depth of 3/16 inches. The terminal assembly includes a screen and terminal configuration with rivet-based construction, and the unit is marked with a white rubber stamp identifying it as "BUSS 4512". This fuse block is commonly used in electrical distribution and protection circuits where reliable fuse mounting and circuit protection are required.