Mersen class H and K fuse blocks accommodate all class H and K power fuses. A choice of screw, pressure plate, and box connectors fit a wide range of stranded or solid copper or aluminum wire. Insulators are either molded glass-filled polycarbonate (GFPC) or phenolic with verified dielectric strength in excess of 2500V. 30, 60, 100 and 200A fuse blocks feature a unique adder block to form multi-pole segmented blocks of as many poles as desired. All fuse clips are made of high conductivity tin-plated copper Class H/K 250 Volts 30 amps 1 poles Non-reinforced Screw connection.