Square D H221NRB Fusible Disconnect Enclosure

Square D H221NRB is a 30-amp, 240-volt heavy-duty fusible safety switch designed as a line-side disconnect in a NEMA 3R enclosure. This 2-pole, 3-wire device provides a cartridge fuse–protected path and includes a neutral conductor, making it suitable for interrupting single- or three-phase feeders up to the rated 30 A. The enclosure is rated NEMA 3R for indoor or outdoor use, with bolt-on hub provision to accommodate different conduit configurations. The unit is UL-listed for safety and reliability and is intended for applications where a code-compliant disconnect is required—such as motor circuits, pumps, irrigation systems, and other equipment requiring routine isolation. Fuse provisions accept cartridge fuses, and at 240 VAC (with voltage ratings up to 250 VDC in some configurations) it aligns with Square D’s safety-switch lineup, delivering a rugged, weather-resistant solution for service entrances, switchgear, outdoor enclosures, or load isolation in industrial settings.