Square D | QO120M100RB | Circuit Breaker | 100A | 240V

The Square D QO120M100RB circuit breaker is the trusted solution for protecting your 100A, 240V circuits within QO-style panels. Built for maintenance, retrofit, and replacement, this unit is designed to slot into existing systems where exact specs matter, delivering reliable performance when it’s needed most.

Key specifications

• Amperage: 100A
• Voltage: 240V

Why this breaker stands out

• Designed for Square D QO-series panels, offering a precise fit for compatible electrical systems.
• Ideal for maintenance, retrofit, and replacement projects where matching the original specs is essential.
• Part number QO120M100RB serves as the most reliable reference for compatibility—keep this reference handy when shopping for replacements.

Use cases and scenarios

• Upgrading or restoring a residential or commercial electrical panel to ensure continued protection of 100A circuits at 240V.
• Retrofit projects where existing breakers in a Square D QO panel require exact spec matching to maintain safety and code compliance.
• Maintenance replacements to restore optimal circuit protection after wear or trip history.

How to ensure a proper fit

• Confirm fit and ratings before ordering. The part number is the best reference for compatibility.
• Compare the panel model and the existing breaker to ensure the QO family alignment and electrical ratings match the required specifications.
• When installing, ensure the main power is off and that the breaker seats fully in its position for secure operation.

Practical guidance

If you’re maintaining or upgrading a panel, this QO120M100RB breaker provides a straightforward, standards-aligned path to restoring circuit protection without overhauling the whole system. Its 100A, 240V rating makes it suitable for mid-to-large residential circuits or light commercial installations where robust protection is essential. Keep a few on hand for quick replacements to minimize downtime and keep electrical systems running safely.