Square D QMB327WT3 – 800A, 240V, 3-Pole Fusible Panelboard Switch – QMB Series

Introducing the Square D QMB327WT3 — a dedicated three-pole fusible panelboard switch from Schneider Electric’s trusted Square D QMB Series.Precision-engineered for reliable load disconnect and robust overcurrent protection when used with the appropriate fuse class in QMB fusible panelboards, this unit is a cornerstone of safe, predictable power distribution in demanding environments.

Why the QMB327WT3 stands out

• High-capacity performance — 800 A at 240 V handles large, multi‑section loads without compromising protection.
• Balanced three-phase protection — 3-pole configuration ensures equal protection across all phases, reducing imbalance risks in commercial and industrial systems.
• Exceptional fault protection — 200 kAIC interrupting rating preserves upstream equipment during fault events, helping minimize downtime.
• Field-replaceable, compact design — compact form factor with a field-replaceable package streamlines maintenance and reduces service time on critical circuits.
• System-partnered reliability — explicitly designed for use within QMB fusible panelboards, delivering a cohesive, proven protection strategy.

Ideal use cases and who benefits

• Industrial facilities and manufacturing floors with heavy, multi-zone loads that require dependable phase protection.
• Commercial electrical rooms serving multi-zone facilities where rapid load isolation is essential for safe maintenance.
• Data centers or server rooms needing structured, safe maintenance procedures and robust overcurrent protection.
• Projects relying on Schneider Electric Square D QMB fusible panelboards for centralized power distribution.

Key specifications

• Series: QMB
• Part number: QMB327WT3
• Amperage: 800 A
• Voltage: 240 V
• Poles: 3-pole configuration
• Interrupting rating (KAIC): 200 kAIC
• Application: Fusible panelboard switch for QMB fusible panelboards
• Manufacturer: Schneider Electric / Square D

Installation and compatibility guidance

• Designed for use specifically with QMB fusible panelboards; pair with the appropriate fuse class to achieve the stated 200 kAIC capability.
• Three-pole configuration provides balanced protection across all three phases, making it ideal for three-phase power systems typical in industrial and commercial facilities.
• Verify system voltage and panelboard compatibility to ensure optimal protection and safe operation during maintenance and fault conditions.

Practical benefits in the real world

• Clear fault isolation path enables maintenance work without compromising the rest of the distribution system.
• Durable construction and field-replaceable design minimize downtime when circuits need service or replacement parts.
• By aligning with a proven QMB protection strategy, it supports safer, quicker maintenance workflows and reduces risk to critical loads.

How this component fits into your protection strategy

Choosing the QMB327WT3 means you’re building a robust, maintainable protection layer into centralized power distribution. It delivers decisive load isolation and dependable overcurrent protection for high-demand environments, while its 3-pole arrangement and high interrupting rating help keep essential equipment safe during faults. When integrated into a QMB fusible panelboard, it becomes a reliable backbone for safe maintenance, faster service, and reduced downtime across your facility.