Square D DU323 - 100A, 240V, 3-Pole, Safety Switch

Overview

The Square D DU323 Safety Switch is a purpose-built disconnect designed for industrial and commercial environments where safe, reliable electrical isolation is non-negotiable. With a 100 A rating operating at 240 V and a true 3-pole design, this switch ensures complete isolation of all three phases, enabling safer maintenance, servicing, and startup procedures.

Why the DU323 stands out

• Comprehensive 3-phase isolation: A dedicated 3-pole configuration guarantees full disconnection of each phase, reducing the risk of partial energization during servicing.
• Lockout/Tagout readiness: Designed to support proper lockout/tagout procedures, helping teams meet safety requirements and minimize downtime during maintenance.
• Load-safe switching: Engineered to deliver dependable disconnection when circuits are energized, providing reliable protection for personnel and equipment alike.
• Durable industrial design: Built to withstand the rigors of busy facilities, ensuring long-term performance in demanding environments.
• Straightforward integration: A practical solution for control panels, machine rooms, and service entrances where a compact, dependable safety switch is needed.

Ideal applications

• Industrial manufacturing lines requiring reliable isolation for routine maintenance and emergency servicing.
• Commercial facilities that rely on safe, code-compliant energy disconnection in electrical rooms and panels.
• Control panels and Electrical Distribution Systems (EDS) where three-phase protection is essential.
• Anywhere you need a robust, easy-to-operate safety switch that supports lockout/tagout environments.

Key specifications

• Amperage rating: 100 A
• Voltage rating: 240 V
• Number of poles: 3-Pole
• Product type: Safety Switch
• Brand: Square D
• Model: DU323

Practical benefits and use cases

• Safer maintenance windows: By providing a definitive isolation point, the DU323 minimizes the chance of accidental re-energization during service work.
• Aligned with 3-phase systems: The 3-pole configuration is ideal for three-phase equipment, ensuring all live conductors are isolated simultaneously.
• Consistent operation over time: Built for durability in busy facilities, reducing the need for frequent replacements or adjustments.
• Clear safety workflow: Supports a structured shutdown-and-restore process, helping teams execute lockout/tagout procedures with confidence.

Installation and best-practice tips

• Confirm compatibility with your panel cutout and mounting provisions before installation.
• Follow manufacturer guidance for wiring terminals and enclosure grounding to ensure optimal performance.
• Coordinate with your facility’s lockout/tagout program to maximize safety during servicing.
• Document the switch location in your maintenance logs to streamline future outages and resets.