Square D QMJ364H - 200A, 600V, Fusible, Switch

Square D QMJ364H is a robust 200A, 600V fusible switch built for reliable on/off isolation and precise overcurrent protection in demanding industrial and commercial environments. Its compact, maintainable design makes it a practical choice where space is at a premium but reliability isn’t negotiable.

Designed to meet the needs of motor control and distribution applications, the QMJ364H serves as a trusted motor disconnect switch and panelboard protection point. When you need a dedicated, fuse-protected disconnect that’s easy to service, this unit delivers straightforward isolation with dependable protection for downstream circuits.

Key specifications

• Model: QMJ364H
• Amp rating: 200A
• Voltage rating: 600V
• Fusible: Fusible design (requires compatible fuses)

Why this fusible switch stands out

• Targeted protection—By integrating fuse protection at the point of use, the QMJ364H helps limit fault currents to protect conductors, equipment, and downstream devices, while providing a clean isolation point for maintenance.
• Compact, maintainable form—The switch’s footprint is designed to fit into tighter installations without sacrificing accessibility for fuse replacement and service checks.
• Versatile application—Ideal for motor disconnects, panelboards, and branch circuits where a reliable, easy-to-service protective switch is required to meet diverse industrial or commercial needs.
• Reliability in demanding environments—Built to perform consistently in environments where robust isolation and dependable protection are essential for uptime and safety.

Practical use cases

• Motor control centers and machinery rooms requiring a dedicated, fuse-protected disconnect for maintenance or service work.
• Panelboard upgrades or new installations where a compact, fusible disconnect is preferred for branch circuit protection.
• Locations needing a clear, safe isolation point to quickly shut down a circuit during fault conditions or routine servicing.

How it helps your operation

The Square D QMJ364H provides a decisive balance between protection and practicality. By combining a fusible protection scheme with a reliable isolation switch, it helps you manage fault currents effectively, coordinate with upstream protection, and simplify maintenance workflows. In environments with frequent servicing or high motor loads, having a dedicated, easy-to-service disconnect reduces downtime and supports safer lockout/tagout procedures.

Tips for optimal use

• Pair the QMJ364H with appropriately rated fuses to ensure complete protection of the protected circuit.
• Plan for straightforward fuse replacement by choosing an installation location with unobstructed access and clear labeling.
• Ensure compatible wiring practices and correct terminal tightness during installation to maintain reliable contact and minimize heat buildup.
• Use this fusible switch as a dedicated isolation point in motor circuits and branch feeds to maximize protection and serviceability.

Whether you’re configuring a new motor control scheme or upgrading an existing panelboard, the Square D QMJ364H delivers a focused combination of rated 200A at 600V, fusible protection, and easy maintenance—a steadfast choice for professional-grade isolation and circuit protection.