Square D HU366 600A 3P 600V Safety Switch, NEMA 1, Fusible, Non-Fusible | AmpState

The Square D HU366 safety switch is a rugged, 3-pole disconnect designed for reliable point-of-use isolation in industrial environments. Built to support heavy loads, it offers both fusible and non-fusible configurations—making retrofit projects and maintenance planning simpler when the part number must stay consistent.

• Three-pole, 600 A rating provides a robust disconnect for demanding motors and equipment
• 600 V maximum voltage suitability for standard industrial distribution
• NEMA 1 enclosure ideal for indoor, dry environments with easy access for maintenance
• Fusible or Non-Fusible configurations give you installation flexibility to match your protection strategy
• Equipment disconnect and isolation at the point of use supports safe servicing, lockout/tagout, and quick Downtime planning
• Retrofit-friendly keeps the catalog part number intact, simplifying ordering and spare-part continuity

Why this matters in the field: HU366 is not just a switch—it's a strategic component that keeps downtime predictable and maintenance workflows efficient. The 3-pole design ensures balanced switching across phases, reducing electrical stress during disconnections and enabling clearer troubleshooting in complex panel layouts. The choice between fusible and non-fusible configurations lets you tailor protection without overhauling your control architecture.

Specifications

• Manufacturer: Square D
• Part Number: HU366
• Product Type: Safety Switch
• Amperage: 600 A
• Poles: 3
• Voltage: 600 V
• Enclosure: NEMA 1
• Configuration: Fusible or Non-Fusible

Available from AmpState, the HU366 is a dependable choice for facilities seeking a ready-to-install, configurable safety switch that aligns with retrofit projects and ongoing maintenance plans. Need help matching a part number or confirming compatibility? Message us and we’ll help you confirm fit.