Square D HU365 - 400A, 600V, 3-Phase, Switch

Meet the Square D HU365—a rugged 400A, 600V, 3-Phase fusible switch engineered for reliability in demanding industrial and commercial settings. This switch delivers decisive on/off isolation and integrates overcurrent protection when paired with the appropriate fuse links, helping you keep critical equipment safe and systems running smoothly.

Why the HU365 stands out

• High-capacity, compact design: 400A at 600V in a space-conscious 3-Phase package that fits into existing panelboards and switchgear footprints without sacrificing performance.
• Fusible switch architecture: Combines immediate isolation with protective capability, reducing the need for multiple devices and simplifying electrical protection schemes.
• Reliable isolation for maintenance: Provides a clear, tangible disconnect so maintenance teams can work confidently and safely, minimizing downtime.
• Durable industrial build: Designed to endure the rigors of demanding environments, helping you lower replacement costs and keep downtime to a minimum.
• Ideal for motor disconnects and branch circuits: Perfect for applications where a compact, maintainable switch is required to protect feeders, feeders to panelboards, and critical branch circuits.

The HU365 is more than a switch—it's a trusted control point that streamlines protection, simplifies maintenance, and supports safer, more efficient operation of large electrical loads. Built by Square D, a name synonymous with robust electrical components, this unit is ready to perform in service bays, equipment rooms, and industrial facilities where dependable isolation matters most.

Practical uses and benefits

• Use as a dedicated motor disconnect to secure equipment during servicing while providing reliable fault protection.
• Panelboard integration: Seamlessly integrates with existing panelboard configurations to consolidate isolation and protection in one device.
• Branch circuit protection: Protect feeders and critical circuits from overcurrent conditions through the proper fuse links, reducing collateral damage downstream.
• Maintenance-driven downtime reduction: Clear isolation points enable quicker troubleshooting and safer, faster servicing.

Specifications at a glance: Model HU365 • Amperage 400A • Voltage 600V • Phase 3-Phase. For installations requiring a compact, maintainable solution that combines isolation with protective capability, the HU365 from Square D delivers precise performance where it matters most.