Schneider Electric DU321 Enclosed Disconnect Switch

Schneider Electric DU321 is a 30 A general‑duty, non‑fusible safety disconnect switch designed for indoor use in a 240 V, 3‑pole configuration. Housed in a Type 1 (NEMA 1) enclosure, the unit provides a safe, single‑throw means to interrupt a 3‑wire, 240 VAC circuit, and it is surface‑mounted for convenient installation in utility rooms or behind equipment. This DU321 model is commonly used as a dedicated disconnect for residential and light commercial loads such as pumps, fans, HVAC equipment, and other 240 V circuits requiring reliable isolation. It carries a 30 A rating and offers a short‑circuit current rating up to 100 kA at 240 V, depending on system conditions, enabling robust fault isolation. As part of Square D’s general‑duty safety switch family, the DU321 employs three poles with three‑wire operation to ensure proper disconnection of all conductors, meeting typical code requirements for equipment disconnects in indoor applications.