Ferraz Shawmut Class H Fuse Blocks accommodate all Class H power fuses. A choice of screw, pressure plate, and box connectors fit a wide range of stranded or solid copper or aluminum wire. 30, 60 and 100A fuse blocks feature a unique adder block which can be snapped onto 1, 2, or 3‑pole blocks to form multi‑pole segmented blocks of as many poles as desired. All fuse clips are made of high conductivity tin‑plated copper, with a choice of spring reinforced or non‑spring reinforced clips in 30A and 60A.