Square D | FC24040AC | Circuit Breaker | 2-Pole | Plug-In

The Square D FC24040AC is a two-pole plug-in circuit breaker designed for dependable overcurrent protection in compatible panels. Identified by the part number FC24040AC, this unit is ideal for maintenance, retrofit, and replacement projects where exact spec matching matters.

FC24040AC at a glance

Two-pole, plug-in configuration that fits Square D panels supporting this form factor. The FC24040AC model serves as a precise, drop-in replacement when your setup requires two hot conductors to be protected together, delivering reliable disconnection when fault current is detected.

Key use cases

• Maintenance: replace a failing or worn breaker without altering the panel’s architecture.
• Retrofit: upgrade or modify protection for multiwire branch circuits within compatible Square D systems.
• Replacement: restore original protection where the exact FC24040AC specification is required to maintain panel labeling and performance.

Compatibility & installation tips

• Best reference for compatibility: use the part number FC24040AC to verify fit with your Square D panel model and bus type.
• Before ordering, confirm your panel’s acceptance of plug-in two-pole breakers and ensure the ratings align with existing protection needs.
• During installation, power should be isolated, the old breaker removed, and the new FC24040AC seated firmly into the panel until the latch engages.

What makes it stand out

Unlike generic substitutes, this breaker is tied to a specific Square D specification set via the FC24040AC part number, reducing the risk of misfit issues and ensuring predictable performance in supported panels. The plug-in design enables quicker swaps and preserves the panel’s intended protection scheme, helping maintain electrical safety and system reliability.

Who should consider this model

• Electrical professionals performing routine panel maintenance or fault-related replacements on Square D systems.
• Facilities managers planning retrofits that require precise two-pole protection within existing Square D infrastructure.
• Homeowners or technicians restoring older panels where matching the FC24040AC specification is essential for continued protection and compliance.