Square D H365NR 400A 3P 600V Safety Switch, NEMA 3R, Fusible | AmpState

Square D H365NR 400A 3P 600V Safety Switch, NEMA 3R, Fusible — a purpose-built disconnect solution designed for dependable point-of-use isolation in demanding environments.

Engineered by Square D for robust industrial applications, this fusible safety switch handles up to 400 A with three poles at a voltage of 600 V. The NEMA 3R enclosure provides reliable outdoor protection against weather, dust, and other elements, so you can rely on safe operation in varied conditions.

• 400 A, 3-Pole configuration for efficient three-phase power distribution
• 600 V rating for compatibility with common industrial systems
• NEMA 3R enclosure for outdoor-ready protection
• Fusible design adds targeted overcurrent protection at the disconnect point
• OEM part number H365NR — ideal for replacement projects and keeping your BOM aligned with the original specification
• Point-of-use disconnect supports safe isolation during maintenance and servicing

This safety switch is especially valuable for facilities aiming to replace worn or obsolete disconnects while preserving exact BOM alignment. Its three-pole construction ensures reliable isolation for three-phase equipment, and the fusible design offers selectivity to minimize downtime during faults. Use it as the primary disconnect at the equipment end of feeders or in service entrances where outdoor resilience and straightforward maintenance are priorities.

Available from AmpState. Need help matching a part number or confirming compatibility? Message us and we’ll help you confirm fit.

Who benefits most from the Square D H365NR? Maintenance teams, electrical distributors, and OEMs who require a genuine Square D solution with predictable replacement cycles. If you’re updating a legacy installation or stocking a spare that aligns precisely with the original equipment, this 400 A, 3P, 600V fusible safety switch delivers dependable performance, clear safety benefits, and a straightforward path to continuity of operation.