Square D QMB364W - 200A, 600V, 3-Pole, Fusible, Switch

Square D QMB364W is a rugged 3-pole fusible switch designed to deliver dependable on/off isolation and robust overcurrent protection in demanding industrial and commercial environments. With a 200 A rating and 600 V capacity, this switch handles motor disconnects and branch-circuit protection while maintaining a compact footprint suitable for tight panel layouts.

• Model: QMB364W
• Amperage: 200 A
• Voltage: 600 V
• Poles: 3-Pole
• Fusible: Fusible

Ideal for motor disconnects, panelboards, and branch circuit protection, the QMB364W combines a switch with fuse-based protection in a single, compact unit. This makes it a practical choice when you need reliable isolation plus built-in overcurrent protection without adding extra enclosure space or components.

Key benefits and real-world use

• Integrated protection for three-phase systems: Ensures balanced guarding of all conductors in 3-phase applications, reducing the risk of uneven loading and fault propagation.
• Compact and maintainable design: Fits into standard panelboard configurations while keeping serviceability straightforward when fuse links or connections require attention.
• Reliable motor disconnect capability: Quickly isolate motor circuits for safe maintenance or protective shutdown during faults, minimizing downtime.
• Versatile protection point: Serves as a convenient protection and isolation point for branch circuits, helping simplify electrical distribution in commercial spaces and industrial floors.

This Square D fusible switch is a practical choice for facilities seeking a dedicated, single-device solution that delivers both isolation and overcurrent protection in one compact package. Whether upgrading an existing panelboard, wiring a new motor circuit, or consolidating protective devices, the QMB364W provides clear, dependable control with the reliability you expect from Square D.