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

Square D QMB324W is a robust 200A, 240V, 3-pole fused disconnect switch built for demanding industrial and commercial environments where safe electrical isolation matters. This device is purpose-built to support lockout/tagout procedures and delivers dependable disconnection under load, helping protect workers and equipment during maintenance, repairs, and unexpected shutdowns. Its fused design provides overcurrent protection directly in the disconnect path, reducing fault energy and enabling safer service work.

Key capabilities

• Three-pole configuration: isolates all conductors in the circuit, ensuring complete de-energization when opened.
• 200A amperage rating: handles substantial feeder and motor circuits without sacrificing performance.
• 240V operation: compatible with standard industrial power distribution.
• Fused protection: integrated fusing to provide immediate, reliable current interruption under fault conditions.
• Lockout/Tagout ready: designed to support safety protocols that prevent accidental re-energization during service.
• Durable performance: engineered for long-term reliability in challenging environments.

Use cases and ideal applications

Great for service disconnects on large motors, conveyors, pumps, and HVAC systems. Ideal as a main shutdown point in electrical rooms or at the point of use on heavy-duty equipment. When you need a trusted, code-friendly isolation device that won’t drift or fail under load, the QMB324W delivers.

Why choose this fused disconnect over non-fused options?

Fused switches provide an extra layer of protection by interrupting current in the event of a fault, reducing arcing and safeguarding downstream gear. The Square D build quality further ensures consistent operation and predictable performance over time.

Specs at a glance

• Amperage Rating: 200A
• Voltage Rating: 240V
• Poles: 3-Pole
• Product Type: Fused Disconnect Switch
• Brand: Square D
• Model: QMB324W