Siemens 3NW2040-0HG Fuse, Fast Acting Class CC

Siemens 3NW2040-0HG is a SENTRON cylindrical fuse link from the Class CC family, delivering fast-acting protection for 4 A circuits at up to 600 V AC. The compact body measures about 10.3 mm in diameter and 38.1 mm long (commonly listed as 10 × 38 mm) and drops into standard Class CC fuse holders to shield lighting installations, heating equipment, and control circuits from overloads and short circuits. As a 4 A quick-response device, it is designed to interrupt fault currents rapidly, helping preserve wiring, relays, and downstream electronics in industrial and commercial panels. Typical applications include protection of feeders and control circuits in 120/230/400 V environments and other low-to-medium power electrical installations where Siemens SENTRON CC protection is specified. The 3NW2040-0HG is part of Siemens' broader SENTRON protective components lineup, offering reliable, compact overcurrent protection within UL 248-4-compatible Class CC configurations.