Square D D-323N - 100A, 240V, 3-Pole, Fused Disconnect Switch

The Square D D-323N 100A, 240V, 3-Pole Fused Disconnect Switch is engineered for dependable electrical isolation in demanding industrial and commercial environments. It combines a robust fused disconnect with precise, safe switching to keep systems protected and maintenance teams safe. Designed to support lockout/tagout procedures, this switch helps operators control energy safely during servicing while ensuring reliable disconnection under load for long-term durability.

• Amperage Rating: 100A
• Voltage Rating: 240V
• Number of Poles: 3-Pole
• Product Type: Fused Disconnect Switch
• Brand: Square D
• Model: D-323N

Why the Square D D-323N stands out

In environments where motor loads, conveyors, pumps, and heavy equipment demand reliable isolation, the D-323N delivers. The fused design provides an extra layer of protection, reducing fault propagation and safeguarding both equipment and personnel. The 3-Pole configuration ensures all three phases are simultaneously disconnected, preventing unbalanced conditions during maintenance. Built with durability in mind, it’s designed to endure daily operations in busy facilities while maintaining consistent performance over time.

Key benefits and practical outcomes

• Enhanced safety during service: Integrated lockout/tagout compatibility lets technicians securely de-energize equipment before work begins.
• Reliable load disconnection: Fusing ensures clean, dependable isolation even under startup transients or fault conditions.
• Three-phase protection: The 3-Pole design safeguards all conductors in a 3-phase system, preventing partial energization.
• Durable industrial build: Ready for demanding environments where uptime matters and replacements are costly.
• Seamless integration: Compatible with standard electrical enclosures and service configurations that support Square D solutions.

Ideal applications

The Square D D-323N is well-suited for facilities that require reliable isolation for motors, pumps, conveyors, compressors, and other three-phase equipment. It’s an excellent choice for service disconnects, motor control centers, and maintenance sections where safe, lockable energy isolation is essential.

How it solves common problems

• Problem: Unreliable shutdown during maintenance. Solution: A fuse-backed disconnect that guarantees a solid, observable off-condition when opened.
• Problem: Energy hazards during servicing. Solution: Built-in support for lockout/tagout ensures the system cannot be re-energized accidentally.
• Problem: Inconsistent protection in 3-phase lines. Solution: 3-Pole switching guarantees all phases are isolated together, avoiding partial energization.

Tips for optimal use

Verify that your installation matches the 100A, 240V, 3-Pole specifications of the D-323N. When planning maintenance, implement lockout/tagout procedures and ensure the disconnect is readily accessible to authorized personnel. Schedule periodic inspections of the disconnect’s terminals and fuse elements to maintain dependable performance over time.

With the Square D D-323N, you’re choosing a trusted, purpose-built solution for safe, reliable electrical isolation in demanding environments. It’s not just a disconnect switch—it’s a proactive safeguard for people, equipment, and uptime.