Square D QOU310 - 10 A, 240 V, 3-Pole Bolt-On Circuit Breaker | AmpState

Meet the Square D QOU310 — a dependable bolt-on molded-case circuit breaker designed for branch circuit overcurrent and short-circuit protection in panelboards and load centers. With a 10-amp rating and 240-volt operation, this three-pole device is built to handle three-phase loads while staying compact and secure in your electrical enclosure.

Why this three-pole bolt-on breaker stands out

• Secure bolt-on mounting: A rigid connection to the bus minimizes vibration, reduces contact wear, and maintains consistent protection even in panels subject to movement or vibration.
• Thermal-magnetic trip unit: Combines precise thermal protection with instantaneous magnetic trip for short circuits, delivering stable, repeatable performance across temperatures and loads.
• OEM-compatible design: Engineered to pair with matching Square D OEM load centers and panelboards, ensuring reliable fit and electrical performance without aftermarket compatibility issues.
• Versatile for multiple sectors: Suitable for residential, commercial, and light industrial applications, making it a practical choice for a wide range of panel configurations.

Technical snapshot

• Manufacturer: Square D
• Part Number: QOU310
• Type: Thermal-magnetic molded case circuit breaker
• Amperage Rating: 10 A
• Voltage Rating: 240 V
• Poles: 3
• Mounting Style: Bolt-on
• Application: Branch circuit overcurrent and short-circuit protection

Practical use cases

In a three-phase panelboard or load center, the QOU310 protects branch circuits feeding motors, pumps, fans, and other equipment up to 10 A per pole. Its bolt-on design supports a tight, vibration-resistant bus connection, which is especially valuable in environments with equipment vibration or where panels are mounted in dynamic spaces such as mechanical rooms, rooftops, or industrial settings. For residential and light commercial panels, this breaker provides an extra layer of security for everyday three-phase loads while maintaining compatibility with your existing Square D infrastructure.

Installation and maintenance tips

• Ensure you are pairing the QOU310 with a matching OEM load center or panelboard to maintain rated performance and warranty coverage.
• Follow the manufacturer’s torque specifications for the mounting bolts to secure the breaker without over-tightening.
• Periodic inspection of bus connections and breaker alignment helps sustain optimal trip performance and reduces the risk of nuisance trips.
• Keep in mind this is a 3-pole unit designed for 240 V three-phase systems; verify your panel’s voltage and phasing before installation.

Why this solution stands apart

The Square D QOU310 isn’t just a breaker with a name; it’s a purpose-built protection device that prioritizes reliable, predictable performance in real-world panel environments. The combination of bolt-on mounting, a thermal-magnetic trip mechanism, and OEM compatibility translates into fewer compatibility headaches, easier servicing, and consistent protection for your critical circuits. When reliability and compatibility matter for your panelboards and load centers, the QOU310 delivers with clear, straightforward protections that installers and facility managers can trust.