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Mersen open style class J fuse blocks accommodate all class J fuses ranging from 0-600A, 600V. A choice of screw, pressure plate, box and special order stud 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. All fuse clips are made of high conductivity tin-plated copper, with a choice of spring reinforced or non-spring reinforced clips. 600 Volts 30 amps Adder poles Non-reinforced Box connection.