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Mersen class T fuse block accommodate class T fuses up to 600A. Insulators are either durable, glass-filled polycarbonate (GFPC) or phenolic with verified dielectric strength in excess of 2500V. Mersen is the only manufacturer to offer Class T blocks with copper connectors. Recommended fuse usage: class T blocks (300V) use with A3T. Approvals: All fuse blocks meet the requirements of UL 4248, UL listed; guide IZLT, file E52283; UL recognized component guide IZLT2, file E52283; CSA certified class 6225, file 32169. Ampere rating: 30 GFPC insulator. Connector Torque in 20 pounds.