Square D DU221RB 30A 2P 240V Safety Switch, NEMA 3R, Fusible, Non-Fusible | AmpState

Meet the Square D DU221RB, a rugged safety switch designed for reliable equipment disconnect and precise isolation at the point of use. This 30 A, 2-pole device delivers clean 240 V control with a NEMA 3R enclosure that withstands weather and harsher environments.

Key features at a glance

• Amperage: 30 A
• Poles: 2
• Voltage: 240 V
• Enclosure: NEMA 3R for dependable protection in outdoor or damp settings
• Configurations: Fusible or Non-Fusible options available within the same part-number family
• Part Number: DU221RB
• Brand: Square D (Schneider Electric)

Why this matters for your operation

• Point-of-use isolation with a dependable disconnect that minimizes downtime during maintenance, service, or fault conditions.
• Two-pole design protects both hot legs for safer, code-compliant shutdown of 240 V equipment.
• NEMA 3R rating shields the interior from rain, dust, and incidental moisture—ideal for outdoor panels, equipment rooms, and loading areas.
• Fusible and Non-Fusible configurations offer flexibility: use fusible when you want integrated circuit protection, or non-fusible when you need a straightforward disconnect paired with separate protection downstream.
• Direct part-number match supports quick, accurate sourcing for maintenance teams and panel builders, reducing mis-orders and downtime.

Ideal use cases

• Isolation for industrial motors, pumps, conveyors, and compressors that require reliable, safe shutoff at the load point.
• Outdoor or moisture-prone installations where a rugged NEMA 3R safety switch ensures continued operation and easier serviceability.
• Spare parts inventory for facilities managers who rely on standardized, field-tested components from a trusted brand.

How it stacks up against generic disconnects

• Consistent Square D quality with a durable enclosure designed for real-world conditions.
• Clear part-number fidelity reduces procurement ambiguity in large projects or busy maintenance shops.
• Flexible fusible/non-fusible options in a single device mean fewer SKUs to stock and manage.

Need help confirming compatibility or finding the exact fit for your panel? AmpState can verify part numbers, clarify fusible vs non-fusible configurations, and ensure you’re ordering the right safety switch for your electrical system.