Square D | FDA140451 | Circuit Breaker | 45A | 1-Pole | 277V

Square D FDA140451 Circuit Breaker is a precise, OEM protection device designed for maintenance, retrofit, and replacement in commercial and industrial electrical panels. With a 45-amp rating, a single pole, and a 277-volt operation, this breaker is built to safeguard critical circuits in 277V environments.

• Amperage: 45A
• Poles: 1-Pole
• Voltage: 277V
• Part number: FDA140451

Why choose this FDA140451 circuit breaker? It’s tailored for environments where exact specifications matter. It provides reliable overcurrent protection for a single hot leg in 277V systems, helping prevent electrical faults, arc faults, and equipment damage in lighting, HVAC, or other 277V circuits. The 1-pole design is ideal for dedicated branch circuits where only one conductor requires protection, delivering targeted safety without unnecessary complexity.

Key benefits and differentiators

• OEM compatibility for exact fit: The part number is the strongest reference for matching panels and bus configurations, ensuring a seamless replacement that maintains panel labeling and electrical clearance.
• Application-ready for 277V systems: Specifically designed for commercial and industrial settings where 277V distribution is standard, delivering dependable protection where it matters most.
• Maintenance-friendly replacement: Designed to drop into compatible Square D panels with minimal downtime, helping facilities stay up and running with routine maintenance or retrofit projects.

Ideal applications and use cases

• Retrofit projects replacing worn or outdated 1-pole breakers on 277V circuits.
• New or upgraded panels in commercial buildings that require precise 45A protection for a single hot leg.
• Lighting and auxiliary circuits where a reliable 277V, 1-pole solution is needed.

Compatibility note: Before ordering, verify the fit and ratings against your panel’s labeling. The FDA140451 part number is the best reference to ensure you’re matching the correct model, bus compatibility, and mounting style for your specific Square D panel.

For technicians, facilities managers, and electricians, this FDA140451 circuit breaker offers a straightforward, dependable path to maintaining electrical safety and system performance in 277V applications. Add it to your cart to secure a precise replacement that aligns with your panel’s original design and electrical protection strategy.