Square D H325N - 400A, 240V, 3-Pole, Fusible, Switch, NEMA 1

Meet the Square D H325N — a rugged 400A, 240V, 3-Pole Fusible Switch with a NEMA 1 enclosure, built to deliver reliable on/off isolation and robust overcurrent protection in demanding industrial and commercial settings.

Designed to act as a dependable motor disconnect and branch-circuit protector, the H325N blends a durable, easy-to-operate switch with replaceable fuse elements. This means you get quick, serviceable protection that keeps downtime to a minimum while safeguarding valuable equipment from overloads and faults.

Key advantages

• 400A amperage handling in a compact 3‑pole configuration, suitable for three‑phase motor loads and distribution circuits
• 3‑Pole design provides simultaneous isolation across all phases, enhancing safety during maintenance and servicing
• Fusible construction with replaceable fuse elements for straightforward protection and quick part swaps
• NEMA 1 enclosure for indoor, dry environments, offering protection from dust and incidental contact
• Compact, maintainable footprint that integrates cleanly into panelboards and motor disconnect assemblies
• Ideal for motor disconnects, panelboards, and branch circuits where a reliable, serviceable fusible switch is required

What makes the H325N stand out is its practical blend of protection and maintainability. The fuse-based approach delivers targeted overcurrent protection, while the rugged switch ensures dependable isolation when it’s needed most. This combination helps minimize arc flash risk during maintenance and provides clear, actionable protection for your critical loads.

Ideal use cases

• Indoor motor disconnects in manufacturing lines, process equipment, and packaging systems
• Protection and isolation for panelboards serving three-phase distribution networks
• Branch-circuit protection for high-inrush equipment such as compressors, fans, or presses

Specifications at a glance

• Model: H325N
• Amperage: 400A
• Voltage: 240V
• Poles: 3-Pole
• NEMA Rating: NEMA 1
• Fused: Fusible

Installation and maintenance tips

• Install by qualified personnel in accordance with local electrical codes and standards
• Keep spare fuse elements on hand and clearly labeled for rapid replacements
• Periodically inspect the enclosure for integrity and verify fuse status during routine maintenance
• Coordinate protection with upstream overcurrent devices and downstream equipment to ensure selective protection

The Square D H325N is a practical, purpose-built solution for reliable power control in environments where space, maintainability, and protection matter most. If you need a sturdy, serviceable fusible switch that delivers solid isolation and dependable motor/distribution protection at 400A and 240V, this is the choice that aligns with real-world industrial needs.