Square D QMB225WT3 – 400A, 240V, 2-Pole Fusible Panelboard Switch – QMB Series (Class T fuse version)

The Square D QMB225WT3 is a rugged 400A, 240V two-pole fusible panelboard switch engineered for dependable load disconnect and precise overcurrent protection within QMB fusible panelboards. As a Class T fuse version, it delivers fast-acting, targeted protection for critical feeders while preserving a compact footprint—ideal for commercial and light-industrial settings where space and reliability matter.

Key Benefits

• High-capacity, space-efficient protection: 400 A at 240 V in a two-pole, fusible configuration eliminates the need for bulky standalone protection while still handling demanding feeder loads.
• Class T fuse integration: Specifically designed to work with Class T fuses, delivering tailored, fast-acting protection for essential circuits and motors.
• Massive fault tolerance: 200 kAIC interrupt rating helps safeguard upstream equipment during high-energy faults, reducing the risk of collateral damage.
• Clear load disconnect: Built-in, definite disconnect point supports safe maintenance, testing, and routine shutdowns without compromising protection.
• Seamless QMB ecosystem: Part of the Schneider Electric Square D QMB Series, ensuring cohesive performance with other QMB components and panelboards.

Ideal Use Scenarios

• Main or sub-feeder protection in QMB fusible panelboards across commercial facilities, warehouses, and light-industrial spaces.
• Motor control feeder lines that require Class T fuse coordination for reliable, fast-acting protection.
• Electrical distribution panels in data centers, manufacturing floors, and logistics hubs where protection density and space efficiency matter.

Why this design matters

Combining a robust disconnect with purpose-built overcurrent protection minimizes downtime and shields downstream equipment from damaging faults. The QMB225WT3’s two-pole footprint fits where space is at a premium, while its fuse-ready architecture streamlines installation—allowing you to deploy a complete, packaged protection solution without juggling separate components.

Installation and Compatibility

• Designed specifically for QMB fusible panelboards and paired with the appropriate Class T fuses to realize the stated protection characteristics.
• Follow local electrical codes and the manufacturer’s guidelines for safe, compliant installation and maintenance.
• Ideal for systems needing a dedicated, reliable disconnect with integrated overcurrent protection to simplify servicing and improve overall safety.

Specifications at a glance

• Amperage: 400 A
• Voltage: 240 V
• Poles: 2
• Fuse class: Class T (fuse version)
• KAIC: 200 kAIC
• Series: QMB
• Manufacturer: Schneider Electric / Square D
• Part Number: QMB225WT3

For reliable, maintainable feeder protection in commercial and light-industrial environments, the Square D QMB225WT3 delivers a compact, integrated solution that keeps systems safe, responsive, and easier to service over the long term.