Square D QMB364W - 200A, 600V, Fusible, Switch

Meet the Square D QMB364W — a robust 200A, 600V Fusible Switch designed to deliver reliable on/off isolation and precise overcurrent protection in demanding industrial and commercial environments. This compact, maintainable switch is purpose-built for motor disconnects, panelboards, and branch circuit protection where space is limited but dependable protection is essential.

Why the QMB364W stands out

• Fusible protection for targeted overcurrent interruption, helping to safeguard motors and feeders while enabling straightforward fuse replacements when servicing is required.
• High current at elevated voltage with a 200A rating and support up to 600V, making it ideal for serious motor disconnects and distribution tasks in both industrial and commercial settings.
• Compact, maintainable design that fits tight electrical rooms or panel layouts without sacrificing ease of service — designed to minimize downtime during inspections or fuse changes.
• Versatile applications perfect for standalone motor disconnects, integration within panelboards, or serving as a dedicated branch circuit protection point.

Practical applications and scenarios

In a production line, the QMB364W can act as the primary disconnect for a large motor, allowing rapid isolation for maintenance while protecting the circuit from overcurrent events. In a distribution panel, it serves as a dedicated fused switch that coordinates with protective devices downstream, helping to isolate faults quickly and safely. For facilities with multiple low- to mid-voltage feeders, this switch provides a compact, reliable solution where space and serviceability matter most.

Key considerations for selecting and installing

• Ensure the 200A current rating and 600V maximum voltage align with your system requirements and conductor sizing.
• Use compatible fuses to achieve the desired protection coordination and to simplify field maintenance.
• Plan for accessible fuse replacement and a mounting footprint that fits your enclosure or switchgear configuration.
• Follow standard electrical safety practices during installation and maintenance to ensure reliable operation and worker safety.

With the Square D QMB364W, you gain a purpose-built fusible switch that delivers dependable isolation and protective capability in a compact, maintainable package — a practical, long-term solution for motor control and circuit protection in demanding environments.