Square D D321N Fusible Safety Disconnect Switch

The Square D D321N is a general‑duty, fusible safety disconnect switch rated for 30 A at 240 V, designed to safely isolate power to small loads in residential and light commercial settings. This 3‑pole, 4‑wire device provides a fusible disconnect option by accepting Class R fuses and offers a short‑circuit current rating of 100 kA at 240 V, making it suitable for protecting conductors and equipment up to about 7.5 HP at 240 V. Housed in a NEMA 1 indoor enclosure, the D321N is intended for reliable service where a dedicated disconnect is needed during maintenance or servicing of motors, fans, pumps and other light‑duty equipment. With a 30 A rating and 240 V operation, it serves as a compact, code‑reliable safety switch for disconnecting power to small industrial or commercial loads, enabling safe lockout and servicing while providing a clear, at‑a‑glance method to deenergize equipment.