Square D QMB310-T - 100A, 240V, Fusible, Switch

Meet the Square D QMB310-T — a rugged 100A, 240V fusible switch designed for reliable on/off isolation and precise overcurrent protection in demanding industrial and commercial environments. This compact, maintainable switch brings motor disconnect capabilities and branch-circuit protection into a single, easy-to-service unit, helping you keep equipment running smoothly and safely.

Key advantages you’ll notice in daily operation:

• 100A at 240V capacity provides solid protection for motors, panelboards, and critical branch circuits without crowding your space.
• Fusible design combines fast-acting protection with a clean isolation path, reducing arc and wear on downstream conductors while meeting essential safety standards.
• Compact footprint fits tighter panels and skid-friendly installations, making it ideal for retrofit projects or space-constrained electrical rooms.
• Maintenance-friendly design simplifies fuse replacement and servicing, minimizing downtime during routine checks or fuse changes.
• Versatile protection purpose-built for motor disconnects, panelboards, and branch circuits, delivering a reliable, integrated protection solution in one device.

Use cases and practical applications

• Motor disconnects for conveyors, pumps, blowers, and fans in manufacturing facilities or processing plants.
• Feed protection and isolation for panelboards in commercial buildings or industrial closets.
• Branch circuit protection where quick, safe disconnection is required during maintenance or fault conditions.
• Control circuits in equipment racks and electrical rooms where space is at a premium but protection cannot be compromised.

Why choose the QMB310-T for your electrical protection strategy

• Reliability under load: the fusible switch design provides dependable isolation and current interruption exactly where and when you need it.
• Operational simplicity: straightforward fuse maintenance keeps your downtime to a minimum while preserving circuit protection integrity.
• Streamlined installation: the compact form factor reduces panel modification needs and accelerates integration into existing systems.
• Clear, purpose-built functionality: specifically engineered for environments that demand both disconnect and fuse protection in one unit, so you don’t have to compromise between safety and convenience.

Specifications at a glance

• Model: QMB310-T
• Amperage: 100A
• Voltage: 240V
• Fusible: Fusible (protective fuse integration)
• Applications: motor disconnects, panelboards, and branch circuit protection

Tips for installation and best practices

• Verify compatibility with your panel and wiring methods, and ensure the fuse type and rating align with the protected circuit requirements.
• Follow lockout/tagout procedures during maintenance to maintain a safe working environment.
• Position the switch for convenient fuse access and visual inspection of the fuse status during routine checks.
• Use the QMB310-T in configurations where a compact, maintainable solution is essential to minimize downtime and maximize uptime for critical loads.