Schneider Electric D321N Fusible Safety Switch

Schneider Electric's Square D D321N is a general-duty fusible safety switch that provides a hard disconnect with built-in overload protection for 3‑phase equipment. Rated for 30 A at 240 V AC, this 3‑pole, 4‑wire device is housed in a NEMA 1 indoor enclosure with a neutral terminal and is specified as a Type 1 safety switch with neutral. The unit is designed for indoor installations in light commercial and industrial settings and is commonly used to isolate loads such as motors, pumps, and HVAC equipment, enabling safe servicing and maintenance. It features a rugged steel enclosure suitable for surface‑mount installation with lug terminals, and, as a fusible disconnect, requires appropriately sized fuses to protect the circuit it guards. This combination of disconnecting capability and fuse protection makes the D321N a compact, code-appropriate solution when a dedicated 240 V disconnect is required.