Square D QMB225W – 400A, 240V, 2-Pole Fusible Panelboard Switch – QMB Series

The Square D QMB225W is a rugged 400A, 240V, 2‑pole fusible panelboard switch engineered for the demanding environments of industrial electrical distributions. As part of Schneider Electric’s reliable Square D QMB Series, this unit provides a dependable main‑disconnect solution for QMB fusible panelboards, delivering both load disconnect and precise overcurrent protection when paired with the correct fuse class.

Why the QMB225W stands apart

• High-current capability: 400 A rating designed to manage heavy feeder loads with confidence, helping you simplify large‑scale distribution.
• Two-pole isolation: Simultaneous disconnection of both live conductors enhances safety during maintenance and servicing.
• 200 kAIC interrupt rating: Robust fault protection that stands up to high‑fault scenarios common in industrial facilities.
• Seamless compatibility with QMB fusible panelboards: Engineered to work with the correct fuse class, ensuring consistent protection and performance.
• Trusted brand lineage: Schneider Electric’s Square D heritage brings decades of panelboard protection expertise to your distribution system.

Ideal use cases

• Main feeder disconnects in industrial facilities, manufacturing floors, and distribution centers.
• Control rooms and mechanical spaces requiring a robust, code‑compliant fuse‑based switching solution.
• Retrofits or replacements within existing QMB fusible panelboards where a high‑current, two‑pole disconnect is needed.

Specifications at a glance

• Amperage: 400 A
• Voltage: 240 V
• Poles: 2
• KAIC: 200 kAIC
• Manufacturer: Schneider Electric / Square D
• Part Number: QMB225W
• Series: QMB

Practical considerations for installation and operation

• Pair the QMB225W with the appropriate fuse class specified for your QMB fusible panelboard to guarantee the intended overcurrent protection and clean load isolation under normal and fault conditions.
• Confirm that your panelboard rating, wiring gauge, and cooling capacity align with a 400A, 240V, two‑pole configuration before install.
• Follow all applicable electrical codes and standards during planning, wiring, and commissioning to ensure a safe and compliant installation.

With the QMB225W, you gain a purpose‑built main‑disconnect that combines heavy‑load capability, rapid isolation, and superior fault resilience, all backed by the proven Square D / Schneider Electric reliability you expect. It’s the smart choice for secure, efficient power distribution in demanding industrial settings.