Square D QMB264W – 200A, 600V, 2-Pole Fusible Panelboard Switch – QMB Series

Meet the Square D QMB264W—a rugged 200 A, 600 V, 2-pole fusible panelboard switch engineered for dependable load disconnect and overcurrent protection within Schneider Electric’s Square D QMB Series. Designed to deliver reliable performance in commercial and light-industrial electrical distribution, this device helps you isolate faults quickly while safeguarding downstream equipment.

Key advantages

• Integrated protection and disconnect—when paired with the appropriate fuse class inside QMB fusible panelboards, the QMB264W provides both disconnect capability and overcurrent protection in a single, compact device.
• High-current capability—rated for 200 A at 600 V, enabling safe interruption of significant fault currents in main or sub-panels.
• Industrial-grade fault tolerance—KAIC rating of 200 kAIC supports the high-short-circuit currents common in commercial and industrial environments.
• Seamless compatibility—part of Schneider Electric’s QMB Series, ensuring straightforward integration with QMB fusible panelboards and standard Square D fuses.
• Flexible applications—ideal for service disconnects, main distribution panels, or branch protection in data centers, manufacturing facilities, retail spaces, and other larger buildings where quick, reliable fault isolation is essential.

Technical snapshot

• Amperage: 200 A
• Voltage: 600 V
• Poles: 2
• KAIC: 200 kAIC
• Series: QMB
• Manufacturer: Schneider Electric / Square D
• Part Number: QMB264W

How it works and practical use

The QMB264W functions as a two-pole fusible switch that combines a load disconnect with overcurrent protection when used with the correct fuse class inside a QMB fusible panelboard. In data centers, manufacturing facilities, or retail environments, this means you can rapidly isolate a fault at the main distribution level or protect individual branches without adding a separate protective device. The result is faster fault isolation, simpler panel design, and streamlined maintenance—backed by a robust 200 kAIC rating that stands up to demanding electrical environments.

Installation and compatibility considerations

• Designed for straightforward integration within existing QMB layouts, reducing custom engineering and easing panel upgrades.
• Works with standard Square D fuses chosen to match the QMB264W’s 200 A rating and 600 V operating range; consult applicable fuse class guidelines to ensure compliance and protection coordination.
• Ideal for service disconnects and main distribution roles in commercial or light-industrial panels where space, reliability, and fast fault isolation matter.

Who should consider the QMB264W

Electrical engineers, facilities managers, and electrical contractors responsible for service entrances, main distribution panels, or branch protection in data centers, manufacturing facilities, or large retail environments will appreciate the QMB264W’s combination of disconnect capability, overcurrent protection, and seamless QMB Series compatibility. It offers a concrete, field-proven solution for reliable fault isolation without complicating panel designs.

Why this matters

In environments where uptime and safety are non-negotiable, a dedicated fusible panelboard switch like the QMB264W delivers predictable protection, fast fault isolation, and simplified maintenance pathways. Its 200 A at 600 V rating, together with a 200 kAIC fault tolerance, means you’re prepared for demanding load conditions and short-circuit events, while staying aligned with Square D/QMB Series standards for easy integration and compliance.