Square D | FAL14040 | Circuit Breaker | 40A | 1-Pole | 277V | 18kA

Meet the Square D FAL14040 Circuit Breaker — a purpose-built, dependable safety device designed for commercial and industrial electrical systems. This 40A, 1-pole breaker is rated for 277V operation and delivers an impressive 18 kA interrupting capacity, making it a solid choice for protecting circuits with moderate to higher fault currents.

Designed for maintenance, retrofit, and replacement projects where exact specifications matter, the FAL14040 ensures you’re using a device that matches the original protection scheme. The part number FAL14040 is your best reference for compatibility—always confirm fit and ratings before ordering.

Key specifications

• Amperage: 40 A
• Poles: 1-Pole
• Voltage: 277 V
• Interrupting capacity: 18 kA
• Brand/Series: Square D (FAL family)
• Part number: FAL14040

Ideal use cases

• Commercial lighting and multi-load circuits powered by 277V systems
• Retrofit installations that require an exact 40A, 1-pole protection device
• Replacement of worn or outdated breakers in panels designed for the FAL series
• Maintenance projects where precise compatibility with existing Square D gear is essential

Why this breaker stands out

Unlike generic substitutes, the FAL14040 aligns with Square D’s protection philosophy: reliable tripping performance, consistent electrical characteristics, and a form factor suited to panels that accept FAL-type devices. The 1-pole design is ideal for single-leg circuits or branch circuits that don’t require a dual-pole arrangement, while the 277V rating expands the range of lighting and auxiliary loads you can safely protect.

How it helps you keep systems safe

• Predicable protection for circuits prone to nuisance trips on moderate fault currents
• Efficient replacement workflow thanks to explicit part number matching
• Peace of mind knowing the device supports up to 18 kA fault current, reducing risk during short circuits

Practical tips for installation and verification

• Before ordering, verify fit by cross-checking the part number FAL14040 against your panel’s accept list and ratings
• Power down the panel and use proper lockout/tagout procedures before removing or installing breakers
• Inspect the bus connection and mounting mechanism to ensure secure seating and proper alignment with the panel door labeling
• Keep a copy of your panel’s documentation handy to confirm that a 1-pole 40A 277V device with 18 kA interrupting capacity is appropriate for the circuit