Square D QMB324W - 200A, 240V, Fusible, Disconnect Switch

The Square D QMB324W 200A 240V Fusible Disconnect Switch is built for demanding industrial and commercial environments where reliable power isolation and circuit protection are non-negotiable. This rugged disconnect delivers clear on/off control and dependable overcurrent protection, helping maintenance teams and electricians keep equipment safe and downtime to a minimum.

Key specifications

• Model: QMB324W
• Amperage: 200A
• Voltage: 240V
• Fused: Fusible

Why this fusible disconnect stands out

Designed to protect both people and equipment, the QMB324W combines compact, space-conscious packaging with robust fusible protection. The fuse-based design helps coordinate circuit protection with motor starting and fault conditions, reducing the risk of electrical damage and arc events. Its straightforward construction makes routine maintenance and fuse replacement predictable and efficient, so critical lines stay protected without unnecessary downtime.

Ideal use cases

• Motor disconnects on manufacturing lines, conveyors, pumps, and fans
• Primary or branch circuit protection for panelboards in commercial facilities
• Compact protection for space-constrained electrical rooms and equipment enclosures

What problems it solves

• Provides immediate, dependable isolation for safe maintenance and servicing
• Offers overcurrent protection tailored to 240V circuits with a 200A rating
• Helps manage inrush and fault conditions on motor-driven loads
• Delivers a compact, maintainable solution suitable for tight installations

Practical tips for installation and use

• Pair the disconnect with correctly rated fuses to ensure proper protection; always match fuse type and rating to the circuit requirements
• Install in accordance with local electrical codes and enterprise safety standards
• Label clearly for maintenance crews and implement lockout/tagout procedures during service
• Use in environments where quick, reliable isolation of 240V circuits is needed for safety and downtime reduction

Who it's ideal for

Electrical engineers, facilities managers, and installation professionals who require a dependable, fusible disconnect for motor control, panelboard protection, and branch circuit safety in both industrial and commercial settings will appreciate the Square D QMB324W. It’s the right choice when you need a compact, durable solution that doesn’t compromise on protection or maintenance practicality.

With the Square D QMB324W, you get a trusted disconnect switch that prioritizes clear isolation, proven overcurrent protection, and a design that fits into tighter electrical spaces without sacrificing performance.