Square D QMB-364 - 200A, 600V, Fusible, Switch

The Square D QMB-364 is a robust 200A, 600V fusible switch engineered for dependable on/off isolation and precise overcurrent protection in demanding industrial and commercial settings. This compact disconnect brings a controlled, field-serviceable solution to motor loads, panelboards, and branch circuits where space is at a premium but reliability isn’t optional.

• Model: QMB-364
• Amperage rating: 200A
• Voltage rating: 600V
• Fusing: Fusible design for immediate overcurrent interruption
• Purpose: Provides reliable on/off isolation and branch-circuit protection in a single, maintainable package
• Application fit: Ideal for motor disconnects, panelboards, and other circuits requiring a compact, serviceable fusible switch

Why choose a fusible switch like the QMB-364?

In environments where reliable equipment protection matters, a fusible switch delivers targeted protection right at the source. The QMB-364 combines a compact footprint with straightforward maintenance, making fuse replacement quick and downtime minimal. By providing both isolation and overcurrent protection in one unit, it helps you coordinate protection schemes and keep critical loads secure from faults.

Practical use cases

• Motor disconnects: Quickly isolate equipment for safe maintenance while protecting downstream circuits from overloads.

• Panelboards: Integrate a reliable disconnect with built‑in protection to simplify electrical distribution and improve safety.

• Branch circuits: Protect individual circuits or loads without sacrificing space or accessibility in crowded electrical enclosures.

Ideal for

Facilities and operations where a compact, maintainable electrical disconnect is needed without compromising protection. This includes industrial plants, commercial buildings with heavy electrical demands, and any setup requiring a dependable, fusible switch that can be serviced efficiently on-site.

With the Square D QMB-364, you gain a purpose-built solution that aligns with practical protection goals, supports safe maintenance practices, and fits where larger, more complex disconnects won’t. It’s a trusted choice for engineers and technicians who value clarity, reliability, and ease of service in a single, robust fusible switch.