The Bussmann LPJ-450SP Class J fuse is a high‑current, dual‑element time‑delay fuse rated for 450 A and 600 V AC (300 V DC), designed for bolted blade end installation in industrial power circuits. It combines time‑delay operation with current limiting to handle motor inrush and protect feeders, delivering interrupting ratings of 300 kAIC at 600 Vac and 100 kAIC at 300 Vdc. Physically, the unit measures 8 inches long with a 2.5 by 2.5 inch cross section and weighs about 1.39 lb, and it uses non‑indicating bolted blade end connections. Typical applications include motor control centers, drives, and other high‑inrush, high‑current circuits where Class J protection is required.
