New modular fuse blocks for Class J and Class R Fuses simplify design and enhance safety. Optional high-clarity, see-through, IP20 finger-safe covers, with or without blown-fuse indication, have a built-in lockout-tagout feature that improves safety by preventing unauthorized fuse insertion or removal. The modular fuse blocks have a snap-together design and are UL Listed with creepage and clearance distances for feeder and branch circuits. 200A and larger fuse blocks also meet requirements for service entrance circuits. Modular Class J and Class R fuse blocks start at $21.50. Modular Class J power distribution fuse blocks combine fuse block functionality with power distribution capability eliminating the need for a separate power distribution block. Optional finger safe covers are also available. Modular Class J power distribution fuse blocks start at $27.50.