Square D | QOB2110 | Circuit Breaker | 2-Pole | Bolt-On

The Square D QOB2110 circuit breaker is a reliable 2-pole bolt-on unit designed for maintenance, retrofit, and replacement projects where exact specifications matter. Built to align with your panel’s labeling, this breaker helps you restore safe, continuous protection with confidence.

Key details

• Poles: 2-Pole
• Mounting: Bolt-On
• Part number: QOB2110
• Compatibility note: Confirm fit and ratings before ordering; the part number is the best reference for compatibility.

Why the 2-pole bolt-on design matters

The two-pole configuration protects paired conductors, making it ideal for multi-wire circuits and panels that require synchronized protection. The bolt-on mounting delivers a robust, secure connection to the panel’s bus bars, helping reduce the risk of loose connections and ensuring dependable operation in everyday use and during service events.

Ideal use cases

• Routine maintenance on existing Square D panels requiring a like-for-like replacement
• Retrofit projects that standardize protection across aging electrical infrastructure
• Emergency replacement when a breaker fails and the panel references QOB2110 for compatibility

Fit, compatibility, and installation tips

To ensure correct operation, always verify that the panel’s rating matches the breaker's specifications. Use the QOB2110 part number as the primary compatibility reference, and consult the panel’s labeling before purchasing. When installing, power down the service, remove the old breaker, align with the bus bars, and secure the bolt-on mounting firmly to maintain a solid connection.