Square D D325N - 400A, Fused Disconnect Switch

When safety, reliability, and rapid electrical isolation matter most, the Square D D325N stands ready. This 400A fused disconnect switch is purpose-built for demanding industrial and commercial environments where a clear, dependable disconnect under load is non-negotiable. With its robust construction and trusted Square D lineage, you can count on safe, repeatable performance during every shutdown, maintenance, and emergency repair.

• Precise 400A isolation — engineered to reliably interrupt heavy circuits, delivering confident disconnection when it’s most needed.
• Safe lockout/tagout compatibility — designed to support proper safety procedures, helping you meet stringent compliance requirements during maintenance.
• Long-term durability — built to endure frequent cycling and harsh environments in industrial and commercial settings.
• Clear, practical disconnecting solution — provides a visible, controlled break in power to protect personnel and equipment during service work.

Key specifications

• Amperage Rating: 400A
• Product Type: Fused Disconnect Switch
• Brand: Square D
• Model: D325N

Ideal use cases

• Electrical service upgrades in manufacturing facilities, warehouses, and large commercial buildings.
• Maintenance shutdowns and emergency isolation where a reliable, armored disconnect is required.
• Isolation for motors, feeders, and distribution panels where overcurrent protection is essential.
• Retrofits or panel replacements that demand compatibility with existing Square D components and safety standards.

Why this product stands out

Unlike generic disconnect options, the D325N combines the authoritative Square D engineering with a clear emphasis on safety-forward operation. Its fused design not only provides overcurrent protection but also promotes predictable behavior under load, reducing risk during start-up and shutdown cycles. The unit is purpose-built for environments where windows of maintenance demand a trusted, lockable isolation point, making it a practical cornerstone for safety programs and compliance initiatives.

Practical tips for installation and use

• Pair the D325N with correctly rated fuses and compatible enclosures to maintain enclosure integrity and safety clearances.
• Integrate with your lockout/tagout procedures by using standard hasp and label points to ensure personnel safety during servicing.
• Plan for quarterly inspections of contacts and fuse elements to sustain reliable isolation over time.
• Document the disconnect location and model details in your maintenance logs to streamline future outages and safety audits.

Investing in the Square D D325N means equipping your facility with a proven, purpose-built solution for safe, reliable electrical isolation. It’s the dependable choice for professionals who demand precise control, durable performance, and straightforward safety workflows in demanding environments.