Square D DU321RB Safety Switch – 3 Pole – 30A – 240VAC – Non-Fusible – General Duty – NEMA 3R

The Square D DU321RB is a Series E general duty safety switch designed by Schneider Electric for residential, commercial, and light-duty industrial applications. It is commonly used for disconnecting power to lighting systems, air conditioning units, and other general electrical loads where reliable isolation and safety are required.

Built with a NEMA 3R enclosure, this switch is suitable for outdoor installation and provides protection against rain and environmental exposure. Its non-fusible, single-throw design offers simple operation and dependable disconnect functionality without the need for fuse replacement.

This unit is designed for straightforward surface mounting and is suitable for service equipment applications when properly configured with grounding or neutral accessories as required by installation codes.

Specifications

• Brand: Square D
• Manufacturer: Schneider Electric
• Part Number: DU321RB
• Series: E Series
• Type: General Duty Safety Switch / Disconnect
• Configuration: 3 Pole, 3 Phase
• Amperage Rating: 30A
• Voltage Rating: 240VAC
• Duty Rating: General Duty
• Switch Style: Non-Fusible
• Action Type: Single Throw
• Interrupting Rating: 100kA @ 240V
• Mounting Type: Surface Mount
• NEMA Rating: 3R
• Wire Range:
  • Copper: AWG 14–6
  • Aluminum: AWG 12–6
• Number of Wires: 3 (as specified)

Applications

• Residential and commercial HVAC disconnects
• Lighting circuit isolation
• Small motor and appliance disconnects
• Air conditioning outdoor units
• Light commercial electrical distribution
• General-purpose load isolation

Construction Features

• Weather-resistant NEMA 3R enclosure for outdoor use
• General duty design optimized for cost-effective installations
• Non-fusible configuration for simplified maintenance
• Surface-mounted design for easy installation
• Compact footprint for residential/commercial panels
• Built for dependable switching in light-duty applications

Certifications & Approvals

• UL Listed
• CSA Certified (where applicable)
• Meets NEMA KS1 standards
• Authentic Square D / Schneider Electric product

Returns are easy

You may return items within 30 days of delivery for a refund.

FREE Shipping on orders over $149.

My Circuit Breakers offers one to five day delivery in the United States. The variation depends on the chosen shipping speed and the warehouse location for the product(s).

Same Day Shipping

We strive to ship out your items within one business day.

In rare circumstances, My Circuit Breakers may reserve up to 5 business days to complete shipment. Feel free to contact us if your order is time sensitive.

My Circuit Breakers provides a comprehensive 1-year warranty on both new and reconditioned products. Rest assured, all products are authentic OEM (original equipment manufacturer). Extended warranties are available upon request.