Cooper Bussmann JCW-3E Fuse

The Cooper Bussmann JCW-3E is a 3 A, E-rated medium-voltage fuse designed for potential-transformer (PT) circuits, providing current-limiting protection in high‑voltage installations. As part of Bussmann’s JCW line, the JCW-3E is a single‑element fuse with ferrule ends (X ferrule end connection) and a one‑barrel construction intended for PT protection and other medium‑voltage applications where reliable interruption of fault current is critical. It is rated for 2.4 kV / 5.5 kV and offers a RMS symmetrical interrupt rating of 40 kA, helping limit energy delivered to protected equipment during faults. The physical form is a long, cylindrical unit measured at about 7.31 inches in length (185 mm) and 1.56 inches in diameter (39.7 mm), designed for mounting in standard medium‑voltage fuse holders. Typical applications include protection of potential transformers in electrical distribution networks and other high‑voltage protection scenarios where current limiting and predictable performance are required for system reliability.