Square D DU323 100A 3P 240V Safety Switch, NEMA 1, Fusible, Non-Fusible | AmpState

From Square D, the DU323 safety switch delivers dependable equipment disconnect and isolation at the point of use. The DU323 is a 100 A, 3-pole, 240 V safety switch engineered for reliable performance in industrial panels, machine rooms, and demanding control environments. Available in NEMA 1 enclosures with both Fusible and Non-Fusible configurations, it adapts to a wide range of installation needs while keeping the original BOM intact.

Key capabilities that matter in the field

• 3-pole, 100 A, 240 V power disconnection with proven Square D reliability
• NEMA 1 enclosure designed for indoor, panel-mounted protection
• Fusible and Non-Fusible options to match your system's protection strategy
• Fast, point-of-use isolation to quicky de-energize equipment for maintenance or safe troubleshooting
• Original part number compatibility helps keep BOM alignment when replacing worn or failed switches

Ideal use cases

• Equipment disconnects and isolation in manufacturing lines, conveyors, and machine control panels
• Replacement projects where preserving the original BOM simplifies procurement and reduces wiring changes
• Spare parts stocking to minimize downtime when a primary switch fails or wears out
• Retrofits and upgrades that require a dependable, standards-aligned safety switch without panel redesigns

How this DU323 stands out

What sets this safety switch apart is its combination of robust current handling, flexible configuration, and BOM compatibility. The 3-pole design ensures coordinated disconnection across all phases, while the dual Fusible/Non-Fusible options let you tailor protection to your exact application. The NEMA 1 enclosure provides solid indoor enclosure protection, helping shield contacts and components from dust and incidental contact in typical workshop environments.

Support and compatibility

Need help confirming fit or matching a part number to your existing equipment? AmpState offers expert guidance to verify compatibility and ensure seamless replacement. Message us to confirm fit and keep your BOM aligned with the original DU323.