Square D QMB363HW - 100A, 600V, 3-Pole, 3-Phase, Fusible, Switch

The Square D QMB363HW is a robust, purpose-built fused switch designed to deliver dependable on/off isolation and overcurrent protection in demanding industrial and commercial settings. Built to withstand tough operating conditions, this 100A, 600V, 3-Pole, 3-Phase switch is the trusted choice when reliability and safety matter most.

Key features and benefits

• 100A capacity at 600V provides strong protection for motors, equipment, and branch circuits in three‑phase systems.
• 3-Pole, 3-Phase configuration ensures stable, balanced switching for multi‑phase power distribution, aiding orderly startup and shutdown of heavy loads.
• Fusible design combines switching with integrated overcurrent protection, enabling quick isolation and protection of downstream devices and wiring.
• Compact, maintainable construction offers easy installation and straightforward servicing, reducing downtime during routine maintenance or fuse replacement.
• Versatile applications ideal for motor disconnects, panelboards, and branch circuit protection where space‑conscious, reliable protection is required.

Why choose the Square D QMB363HW

In environments where downtime costs time and safety is non-negotiable, the QMB363HW delivers predictable performance with a design that prioritizes accessibility and serviceability. The fusible switch format provides a clear, intentional isolation path, making it easier to diagnose faults and protect downstream equipment without sacrificing speed or accuracy during maintenance or testing.

Practical use cases

• Motor disconnects in manufacturing lines where quick, definitive isolation is needed to safeguard personnel and equipment during maintenance.
• Panelboard protection in electrical distributions that require a compact, one‑box solution for controlling three‑phase circuits.
• Branch circuit protection in commercial facilities where space is at a premium but reliable overcurrent protection is essential.

With the Square D QMB363HW, you’re choosing a time‑tested, purpose‑built fused switch that aligns with real-world electrical protection needs. It’s not just a switch—it’s a dependable safeguard for your three‑phase power systems, designed to keep equipment running smoothly while simplifying maintenance and improving overall safety.