Square D QOU340 40A 3P 240V Circuit Breaker | AmpState

Square D QOU340 40A 3P 240V Circuit Breaker designed to deliver dependable overcurrent protection for panelboards, load centers, and electrical distribution systems. This 3-pole, 240V device provides coordinated protection across three conductors, helping keep critical circuits safe and uninterrupted.

Built by Square D, the QOU340 is a trusted choice for retrofit work and maintenance planning where keeping the exact part number matters. Maintaining a consistent part number streamlines ordering, minimizes downtime, and ensures your electrical system remains compliant with the right component in place.

Ideal applications

• Panelboards and load centers requiring multi-pole protection
• Electrical distribution setups that operate on 240V circuits
• Retrofit projects and ongoing maintenance where part-number consistency is important

Product specifications

• Manufacturer: Square D
• Part Number: QOU340
• Product Type: Circuit Breaker
• Amperage: 40 A
• Poles: 3 Poles
• Voltage: 240V

Why shop with AmpState

Available from AmpState, the QOU340 is ready to ship to keep your project on track. If you need help confirming compatibility or matching a part number, we’re here to assist. Need help matching a part number or confirming compatibility? Message us and we’ll help you confirm fit.

Practical guidance for use

• Choose this 3P 40A 240V breaker when your system requires reliable, multi-pole protection without compromising on part-number consistency.
• Plan maintenance around a known, available part to minimize panel downtime during replacements.
• Coordinate with your distribution strategy to ensure seamless integration with existing Square D components.