Square D DU221RB - 30A, Non-Fusible, Safety Switch

Meet the Square D DU221RB 30A Non-Fusible Safety Switch—a rugged, reliable solution built for dependable on/off isolation in demanding industrial and commercial environments. This disconnect switch is designed to protect personnel and electrical circuits by providing a clear, safe means to de-energize motor loads and branch circuits for service, maintenance, or emergency shutdowns.

What it is and how it helps

The DU221RB is a non-fusible safety switch rated at 30A, intended for applications where a compact, easily maintained disconnect is needed. Because it does not include internal fuses, it offers straightforward maintenance and fast servicing while you rely on upstream protection devices to handle fault current. This makes it an ideal choice for motor disconnects, panelboards, and branch circuits where a reliable, simple isolation point is essential.

Key specifications

• Model: DU221RB
• Amperage rating: 30A
• Fused: Non-Fusible

Ideal applications

• Motor disconnects on conveyor lines, pumps, fans, and other motor-driven equipment
• Panelboard isolation points within control panels and electrical rooms
• Branch circuit protection where a compact, maintainable safety switch is preferred

What sets it apart

• Proven Square D reliability from a trusted brand in industrial electrical safety
• Compact footprint designed to fit into tight control panels and electrical spaces without sacrificing performance
• Simple maintenance thanks to the non-fusible design, enabling quicker inspections and service without fuse handling
• Clear isolation—provides a decisive, easily operable disconnect that enhances safety during servicing

Practical guidance for deployment

Choose the Square D DU221RB when you need a dependable 30A disconnect that pairs with downstream protection to guard motor circuits and branch lines. It integrates smoothly into control panels and panelboard assemblies where a robust, easily serviced safety switch is required. For best results, ensure downstream protection devices are correctly sized for your load, and incorporate standard lockout/tagout practices to maximize safety during maintenance.

Why this matters for your project

If your goal is to minimize downtime while preserving safety and control in demanding environments, the DU221RB delivers. It combines a proven safety mechanism with a compact, maintainable design, making it a practical, long-lasting choice for equipment rooms, manufacturing floors, and serviceable control panels where reliable isolation is non-negotiable.