Square D HU364 - 200A, 3-Pole, Fused Safety Switch

The Square D HU364 200A, 3-Pole, Fused Safety Switch is built for rigorous industrial and commercial environments where safe electrical isolation matters most. With a robust fused disconnect design, it delivers reliable disconnection under load while supporting proper lockout/tagout procedures, helping maintenance teams work safely and efficiently.

Why the HU364 stands out

• High-current reliability: 200 ampere rating provides confident isolation for medium-to-large electrical circuits without sacrificing responsiveness during servicing.
• Three-pole configuration: Three-phase control and protection for balanced, stable operation in motor drives, conveyors, and HVAC systems.
• Fused safety protection: Built-in overcurrent protection with a clear, immediate path to disconnect power, reducing arc-risk and enabling safer maintenance under load.
• Safety-first design: Optimized to support lockout/tagout procedures, ensuring that equipment remains safely isolated during service or repair work.
• Durable, long-term performance: Engineered for demanding environments, delivering dependable operation across years of daily use in industrial settings.

Ideal use cases

• Industrial facilities and manufacturing lines needing secure isolation for motors, pumps, and conveyors
• Commercial power rooms where reliable disconnection under load is essential for maintenance
• Repair and service projects requiring strict lockout/tagout compliance

What problems it solves

• Provides a clear, verifiable disconnect point to protect technicians during servicing
• Offers built-in overcurrent protection to guard equipment and wiring from faults
• Supports safe, compliant maintenance workflows by aligning with lockout/tagout best practices

How it compares to alternatives

The HU364 integrates fused protection directly into the disconnect, delivering immediate, visible disconnection under load—an advantage when safe maintenance and rapid fault isolation are priorities. Its three-pole design ensures balanced phase control, which helps reduce electrical stress on three-phase equipment compared with single-pole disconnects.

Practical tips for use

• Pair the HU364 with established lockout/tagout procedures to maximize worker safety during maintenance.
• Use on three-phase circuits where reliable, load-safe isolation is needed, such as motors and large electrical distribution branches.
• Schedule periodic inspections of the switch and fuses to maintain dependable performance over time.
• Follow all local electrical codes and manufacturer installation guidelines to ensure correct mounting and electrical connections.

Product details

• Amperage Rating: 200A
• Number of Poles: 3-Pole
• Product Type: Fused Safety Switch
• Brand: Square D
• Model: HU364