Fuse block with molded glass-filled polycarbonate (GFPC) insulator with verified dielectric strength in excess of 2500 V. Box type connector. #2-14 aluminium/copper wire. Non-spring reinforced. fuse blocks feature a unique adder block configuration which can be snapped onto 3 pole block to form multi-pole segmented blocks of as many poles as desired. All fuse clips are made of high conductivity tin-plated copper alloy.