Square D QMB364W - 200A, 600V, 3-Pole Panelboard Switch / Switchboard Unit | AmpState

Meet the Square D QMB364W—a 3-pole fusible panelboard switch engineered by Square D (Schneider Electric) for dependable load switching and integrated protection in lighting and distribution panelboards. With a 200 A rating and a 600 V voltage capacity, this compact unit consolidates isolation and overcurrent protection in one robust device. Available from AmpState, a trusted source for reliable electrical distribution equipment.

Why the QMB364W stands out

• Integrated switching and protection: A fusible panelboard solution that combines switching and overcurrent protection in a single compact unit, reducing cabinet clutter and parts count.
• Three-pole simultaneous isolation: The 3-pole design ensures all conductors can be isolated at once, dramatically lowering arc exposure and simplifying service on lighting circuits or feeder paths.
• Coordinated protection when correctly configured: Requires the appropriate upstream protection and fuse class to support selective coordination, helping minimize downstream outages and safeguarding valuable equipment.
• Versatile applications: Ideal for lighting and distribution panelboards in commercial buildings, schools, hospitals, and retail spaces; suitable for feeder configurations in light-to-medium industrial environments; an excellent retrofit or upgrade option for reliable integrated protection.
• Long-term reliability: Rugged, purpose-built design engineered for demanding panel environments with straightforward maintenance access and a clear isolation point in the panel run.

Applications and use cases

• Central isolation and protection point in panelboard runs for new installs or upgrades
• Retrofits where a reliable fusible switch is preferred for integrated protection
• Lighting distribution in commercial spaces, educational facilities, healthcare environments, and retail floors
• Feeder configurations supporting coordinated protection in light-to-medium industrial settings

Installation at a glance

• Install the QMB364W as the main isolation/protection device within the panelboard run
• Pair with the correct upstream protection devices and fuse class per your system design
• Ensure compliance with local electrical codes during mounting, wiring, and commissioning
• Maintain accessible maintenance clearance to preserve serviceability and safe operation

Technical essence

• Amperage: 200 A
• Voltage rating: 600 V
• Poles: 3
• Part number: QMB364W
• Series: QMB
• Manufacturer: Square D (Schneider Electric)

Designed to deliver clear isolation and controlled fault current handling when used with the correct upstream protection strategy, the QMB364W is a practical, space-efficient solution for modern electrical distribution. It’s the dependable choice for facilities seeking coordinated protection without compromising on ease of maintenance or installation flexibility.