Square D QMB324W - 200A, 240V, 3-Pole, Fusible, Switch

Meet the Square D QMB324W, a 200A, 240V, 3-pole fusible switch engineered for dependable power isolation and targeted overcurrent protection in demanding industrial and commercial environments. This isn't just a switch—it's a compact, maintainable disconnector designed to safeguard motor circuits, panelboards, and branch circuits where space and serviceability truly matter.

What makes it unique

• Robust protection with a simple, reliable design: a 3-pole arrangement delivers dependable isolation across all conductors while the fusible element provides fast, predictable current interruption.
• Compact form factor: a space-efficient footprint that fits where larger disconnects won’t.
• Maintenance-friendly: engineered for straightforward fuse replacement and routine servicing, reducing downtime.
• Versatile applications: ideal for motor disconnects, panelboards, and branch circuits that demand dependable power control.

Ideal use cases

• Motor-driven equipment in manufacturing, HVAC, pumping, and conveyors where immediate isolation is essential.
• Panelboard sections requiring a dedicated fusible disconnect for code-compliant overcurrent protection.
• Spaces constrained by footprint, where a compact, reliable switch helps simplify electrical layouts.

How it works

The QMB324W combines a switch with integrated fusible protection. In normal operation, flip the switch to connect or disconnect power. If a fault or overload occurs, the fused element provides fast current interruption, protecting downstream equipment and wiring from damage while providing a clear, safe isolation point for maintenance.

Technical snapshot

• Model: QMB324W
• Amperage: 200A
• Voltage: 240V
• Poles: 3-Pole
• Fused: Yes — Fusible

Installation and maintenance tips

Engage a qualified electrician to install the QMB324W in accordance with electrical codes. Use the appropriate fusible elements rated for 200A at 240V. Plan for regular inspection of the enclosure, fuse status, and disconnect operation to ensure reliable performance over time.