Square D DU221RB - 30A, 240V, 2-Pole, Safety Switch

The Square D DU221RB is a purpose-built Safety Switch engineered for industrial and commercial environments that demand safe, reliable electrical isolation. With a clear focus on lockout/tagout (LOTO) procedures and dependable disconnection under load, this unit is built to stand up to demanding daily use and long-term service.

Key reasons to choose the DU221RB for your electrical safety plan:

• 30A, 240V, 2-Pole design — provides complete isolation for both hot legs in a 240V circuit, delivering a clean, definitive disconnect when maintenance or servicing is required.
• NEMA 3R enclosure — weather-resistant enclosure suitable for outdoor and semi-outdoor installations, protecting the switching mechanism from the elements while maintaining safe access for authorized personnel.
• Lockout/Tagout ready— specifically suited to compliant LOTO procedures, helping you meet safety and regulatory requirements during service and repair tasks.
• Reliable under-load disconnection — designed to interrupt current safely, reducing arc exposure and supporting safer, more efficient maintenance routines.
• Durable, user-focused design — Square D’s engineering delivers a robust, long-lasting solution that stands up to industrial use in demanding environments.

Who is this safety switch ideal for? Facilities that rely on robust electrical isolation for motors, pumps, fans, conveyors, HVAC equipment, and other 240V circuits will benefit from a dedicated disconnect that’s easy to access for maintenance while providing confident, documented safety controls.

How it fits into your safety and operations plan:

• Use as the primary service disconnect for equipment: clearly mark and control the power to downstream devices.
• Integrate with your lockout/tagout program to ensure circuits remain deenergized during repairs.
• Place in accessible locations to streamline routine testing, inspections, and emergency procedures.

Specifications at a glance

• Amperage rating: 30A
• Voltage rating: 240V
• Number of poles: 2-Pole
• Enclosure rating: NEMA 3R
• Product type: Safety Switch
• Brand: Square D
• Model: DU221RB

Bottom line: the Square D DU221RB delivers a precise, reliable, and compliant approach to electrical isolation in both indoor and outdoor settings. If you’re upgrading safety controls, standardizing maintenance shutoffs, or implementing a stricter lockout/tagout regime, this 30A, 240V, 2-pole safety switch is a practical, durable choice that clarifies power status, protects workers, and simplifies compliance.