Square D H321DS Disconnect Switch

Square D H321DS is a fusible, three-pole safety disconnect switch rated for 30 A at 240 VAC, designed to safely isolate three-phase power in industrial and commercial equipment. This single-throw disconnect uses H, J, K, L, or R fuse types (ships with H/J/K/L/R options) and can be field modified to use J fuses, enabling flexible protection for motors and equipment. The unit is enclosed in a NEMA 4/4X rated enclosure, providing protection against moisture, dust, and corrosion in indoor or outdoor installations. With three-pole construction for 3-phase circuits and a 240 VAC rating, it is commonly used as a service or equipment disconnect for motors, pumps, compressors, conveyors, and HVAC equipment. The H321DS is part of Square D's heavy-duty safety switch line and is documented in Schneider Electric's Square D catalog, ensuring compatibility with standard safety switch accessories.