Square D QOB310 10A 3P 240V Circuit Breaker, QO, Bolt-On | AmpState

The Square D QOB310 is a rugged, three-pole circuit breaker designed for reliable protection in QO panelboards, load centers, and electrical distribution systems. With a 10 A rating and 240V operation, this bolt-on unit fits seamlessly into existing circuits, delivering precise overcurrent protection where you need it most.

• Manufacturer: Square D
• Part Number: QOB310
• Type: QO Bolt-On Circuit Breaker
• Amperage: 10 A
• Poles: 3
• Voltage: 240V
• Compatibility: QO family, panelboards, load centers

Why this matters: bolt-on design provides secure mounting and dependable contact in demanding electrical environments. The QOB310 is ideal for replacement projects where maintaining BOM alignment with the original part number is critical, as well as for stocking spares to minimize downtime during service calls. This is a practical choice for technicians maintaining commercial or industrial panels that rely on consistent, long-lasting protection for 240V circuits.

Best-use scenarios

• Replacing a failed 3-pole, 240V circuit breaker in existing QO panels without changing other hardware.
• Keeping a purge spare on hand to preserve BOM integrity and ensure quick field swaps.
• Upgrading or stocking hardware for service vehicles and warehouses where original part compatibility matters.

What to expect in day-to-day use

• Stable, secure electrical connections thanks to bolt-on mounting designed for QO systems.
• Reliable 10 A protection for multi-pole 240V circuits such as motor loads, commercial equipment, and HVAC controls.
• Clear component traceability via the QOB310 part number for easy maintenance records and inventory control.

If you’re unsure about fit or compatibility, AmpState offers expert assistance to verify the correct part number and ensure a precise match for your panelboard or load center. Message us to confirm fit and avoid a mismatch in critical protection devices.