Cooper Bussmann NSB JJN350 Fuses

NSB JJN-350 fuse from Bussmann is a Limitron Class T fast-acting cartridge fuse engineered for high‑current protection in power distribution, motor control, and electric heating circuits. This 350 A device is rated for 300 VAC and 160 VDC, and it uses Bussmann's TRON Fast Acting design in a compact 1" x 2.75" body that fits standard fuse blocks and panelboards. As a current‑limiting fuse, it clears faults quickly to protect downstream equipment while allowing normal inrush currents to pass, with interrupting ratings listed up to 200 kA (AC) / 20 kA (DC) depending on conditions. The JJN‑350 is commonly used in industrial panels, disconnect switches, load centers, and electric heat circuits and is part of Eaton’s Bussmann Limitron family of fuses.