Square D DU321 - 30A, 240V, 3-Phase, Switch

The Square D DU321 - 30A, 240V, 3-Phase Switch is built for reliability in demanding industrial and commercial settings. This compact, maintainable fusible switch delivers dependable on/off isolation and robust overcurrent protection, helping you safeguard motors, control panels, and branch circuits without sacrificing valuable space.

Key benefits that matter in real-world operation

• Compact, maintainable design: engineered to fit tight panel spaces while offering straightforward access for routine maintenance and quick servicing.
• Three-phase efficiency: 3-Phase operation supports balanced loads and dependable motor control across industrial equipment.
• Reliable isolation and protection: provides safe disconnection combined with overcurrent protection to help minimize downtime and equipment wear.
• Versatile power rating: 30A at 240V makes it suitable for a range of motor disconnects, panelboards, and branch circuit protection needs.
• Durable, purpose-built for tough environments: designed to endure the rigors of industrial and commercial installations where performance matters.

Specifications at a glance

• Model: DU321
• Amperage: 30A
• Voltage: 240V
• Phase: 3-Phase

Ideal applications

• Motor disconnects in light to medium-duty industrial equipment and processing lines
• Panelboard isolation points where space is at a premium
• Branch circuit protection in control cabinets and equipment enclosures

Why choose the DU321 for your electrical protection needs

If you’re balancing safety, reliability, and space in a busy facility, the DU321 offers a practical, all-in-one solution. It pairs easy on/off control with built-in protection, reducing complex wiring and enabling faster maintenance cycles. Its 3-phase capability ensures smooth operation for multi-motor systems, while the 30A, 240V rating covers a wide range of common industrial loads.

Practical tips for deployment

• Plan layout in your control panel to minimize wire routing and maximize accessibility for routine checks.
• Install in accordance with local electrical codes and your facility’s motor protection strategy to ensure optimal safety and performance.
• Pair with appropriate fusing and protective devices as part of a coordinated motor control scheme to protect both the switch and connected equipment.