Square D QMB310 - 100A, 240V, 3-Pole Panelboard Switch / Switchboard Unit | AmpState

The Square D QMB310 is a purpose-built, non-fusible panelboard switch designed to reliably control three-phase loads in commercial and industrial environments. Delivering 100 A at 240 V across three poles, it provides sturdy, clear-cut isolation for downstream circuits within lighting and distribution panelboards. Built by Schneider Electric, this unit blends proven performance with a compact, robust form factor that fits seamlessly into your panelboard infrastructure.

Why choose the QMB310

• Three-pole, 100 A at 240 V—efficiently manage three-phase circuits with a single, dependable switch designed for demanding distribution work.
• Non-fusible design—offers clear isolation of downstream loads. Upstream protection and a suitable fuse class must be provided to tailor overcurrent protection to your installation.
• QMB compatibility—seamless integration with lighting and distribution panelboards using the proven QMB mounting, terminals, and form factor for straightforward installation.
• Durable Schneider Electric construction—built to endure panel enclosures and tough operating environments, reducing maintenance concerns over time.
• Maintenance-friendly operation—easy to switch off and isolate circuits during service or upgrades, with clear labeling to confirm status at a glance.

Ideal use cases

Perfect for commercial lighting panels, industrial distribution panels, and retrofit projects where a robust, non-fusible switch is needed to control power to downstream circuits. It serves well in switchgear assemblies, service entrances, and any panelboard setup that requires reliable load interruption and straightforward maintenance access.

Key specifications

• Amperage: 100 A
• Voltage: 240 V
• Poles: 3
• Manufacturer: Schneider Electric / Square D
• Part Number: QMB310
• Series: QMB

Practical considerations and tips

Because the QMB310 is non-fusible, ensure the upstream protection device matches the installation’s protection requirements (fuse class and rating) to deliver appropriate overcurrent protection. Use this switch where straightforward isolation and reliable control of downstream three-phase loads are critical—such as during servicing, panel upgrades, or lifecycle replacements. The QMB310’s compatibility with the QMB family means familiar mounting, terminals, and form factor simplify replacement or retrofit projects, helping to reduce downtime and installation risk.

Available from AmpState, the Square D QMB310 delivers a dependable, well-supported switching solution for panelboard infrastructure that demands predictable performance and easy maintenance in demanding environments.