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

Square D DU323 — 100A, 240V, 3-Pole, Fused Disconnect Switch is engineered for industrial environments that demand safe, reliable electrical isolation. This high-performance fused disconnect is purpose-built to support proper lockout/tagout procedures and provide dependable disconnection under load, delivering long-term durability in demanding settings.

Key benefits that matter in the field

• Three-pole, 100A, 240V design shields three live conductors with a single, consolidated disconnect, streamlining installation and maintenance across complex equipment and feeders.
• Fused protection integrates overcurrent protection directly into the disconnect, helping to minimize arcing and protect downstream equipment during faults or servicing.
• Industrial-grade reliability built by Square D delivers consistent performance in harsh environments, reducing nuisance trips and downtime over the life of the switch.
• Lockout/Tagout readiness engineered to support standard safety protocols, making it easier to lock out sources during maintenance and ensuring personnel safety.
• Safe, controlled isolation under load designed to provide a clean, mechanical path for disconnecting power without compromising safety or equipment integrity.

Ideal use cases

• Motor control centers and heavy machinery feeders in manufacturing and processing facilities
• Electrical service entrances and distribution panels requiring local isolation for maintenance
• Industrial HVAC and process equipment where rapid, reliable disconnection is essential
• Facilities requiring clear, enforceable lockout/tagout points to protect technicians

Why this fuse-based disconnect stands out

Unlike non-fused switches, the DU323 provides built-in protection that helps control fault energy and protects both personnel and equipment during electrical work. Its robust construction stands up to frequent operation, while the fused design allows you to pair the disconnect with the appropriate fuse type and rating for your specific circuit, giving you tailored protection without compromising accessibility.

Technical specifications

• Amperage Rating: 100A
• Voltage Rating: 240V
• Number of Poles: 3-Pole
• Product Type: Fused Disconnect Switch
• Brand: Square D
• Model: DU323

Practical guidance for installation and maintenance

Install by a qualified electrician following local electrical codes and safety standards. Use proper lockout/tagout procedures to secure the disconnect during maintenance. Regularly inspect fuse readiness and replace any blown fuses promptly to maintain protective performance. When in doubt, pair the DU323 with compatible Square D accessories to ensure a seamless, code-compliant installation that lasts for years of service.