Square D HU365 - 400A, 600V, 3-Pole, Safety Switch

Introducing the Square D HU365 — a rugged 400A, 600V, 3-Pole Safety Switch built for dependable on/off isolation and precise overcurrent protection in demanding industrial and commercial environments. With a robust fusible switch design, this unit delivers reliable motor disconnect capability and branch circuit protection in a compact, maintainable package.

• Three-pole isolation for true three-phase control: Guards all live lines with a single, coordinated action, ensuring consistent protection across motors and equipment.
• 400A continuous rating at 600V: Designed to handle sizable motors and distribution circuits, making it suitable for mid- to large-scale installations.
• Fusible switch design for controlled protection: Provides overcurrent protection with straightforward fuse maintenance and replacement when needed.
• Compact, maintainable enclosure: Engineered for easy wiring, quick access for servicing, and seamless integration into standard panels and assemblies.
• Ideal applications: Perfect for motor disconnects, panelboard protection, and branch circuits where space-efficient, reliable safety switching is essential.

The HU365 stands out by combining heavy-duty performance with practical maintainability. Its compact footprint helps maximize usable panel space without sacrificing protection, making it a smart choice for facilities that demand continuous operation and rapid service when fuses need attention. Whether you’re upgrading existing equipment or designing a new system, this safety switch provides a straightforward path to safe, code-compliant isolation of three-phase power.

Use cases and installation considerations

• Motor control centers and main switchgear that require a dedicated three-pole disconnect with reliable current protection.
• Panelboard assemblies where a compact, easy-to-service safety switch reduces installation complexity and downtime.
• Branch circuit protection in industrial or commercial spaces where space-saving solutions are prioritized without compromising safety.