Square D | QOB21101021 | Circuit Breaker | 2-Pole | 240V | Bolt-On

Meet the Square D QOB21101021, a purpose-built 2-pole circuit breaker designed for reliable 240V protection in maintenance, retrofit, and replacement projects. Identified by part number QOB21101021, this bolt-on breaker is your precise compatibility match when upgrading or refreshing a panel that uses bolt-on Square D components.

Key Features and Benefits

• 2-Pole 240V protection—controls two conductors, delivering robust, dual-line circuit interruption for shared 240V circuits.
• Bolt-On mounting—engineered for quick, secure installation in compatible Square D panels, reducing installation time and ensuring a solid connection.
• Exact part reference—the QOB21101021 part number is the most reliable indicator of compatibility, helping you avoid mismatches during maintenance or replacements.
• Versatile use—designed for maintenance, retrofit, and replacement scenarios where the exact specs matter, making it a practical choice for service technicians and facilities managers.

Who This Is For

Ideal for licensed electricians, building facility managers, and maintenance teams working with Square D panels that require bolt-on 2-pole, 240V breakers. If your project involves upgrading aging equipment, replacing damaged components, or retrofitting a panel for a 240V circuit, this breaker provides a compatible, reliable solution.

Common Use Scenarios

• Replacing a worn or damaged 240V two-pole breaker in a Square D bolt-on panel.
• Retrofit projects where a bolt-on QOB-style breaker is required to match existing infrastructure.
• Maintenance cycles in commercial or light industrial settings where consistent, predictable 240V protection is needed.

Compatibility and Fit Verification

Before ordering, verify fit by cross-referencing with the panel labeling and the exact part number. The QOB21101021 is intended for use in panels designed to accept bolt-on Square D breakers of this family. Confirm that your installation is a 2-pole, 240V configuration and that bolt-on mounting is supported in your panel model. Using the correct part number helps ensure proper ratings, mechanical fit, and electrical performance.

Installation Considerations

For safety and optimal performance, disconnect power and follow all local electrical codes during installation. Because panel configurations can vary, this work is best performed by a qualified electrician who can confirm bolt-on compatibility and complete the secure mounting required for reliable circuit protection.

Why Choose This Square D Breaker

The Square D QOB21101021 stands out for its precise compatibility with bolt-on panels and its suitability for essential 240V circuits. By aligning with the exact part number, you reduce the guesswork in replacements and retrofit projects, helping you minimize downtime and ensure consistent electrical protection across your system.

If you’re planning maintenance, retrofit, or replacement in a Square D installation that requires a 2-pole, 240V bolt-on breaker, the QOB21101021 offers a reliable, targeted solution that aligns with your panel’s design and specifications.