Square D | FHF16040 | Circuit Breaker | 40A | 1-Pole | 277V

Square D FHF16040 Circuit Breaker is a genuine, reliable overcurrent protection device designed specifically for 277V circuits. This 40A, 1-Pole breaker is ideal for maintenance, retrofit, and replacement projects where exact specifications matter and compatibility is critical.

Key specifications

• Amperage: 40A
• Poles: 1-Pole
• Voltage: 277V
• Part number: FHF16040
• Brand: Square D

Compatibility and ordering guidance

Notes: Confirm fit and ratings before ordering. The part number FHF16040 is the best reference for compatibility, helping you select the right breaker for your Square D panel and 277V circuits.

Common use scenarios

• Replacing a failed or worn 277V, 40A circuit breaker in compatible Square D panels.
• Retrofit or upgrade projects that require a single-pole, 40A protection device.
• Maintenance work in commercial or light industrial settings where 277V distribution is used.

Why this matters

• Authentic Square D construction ensures reliable performance and seamless panel compatibility.
• A precise 40A rating provides appropriate protection for circuits designed to carry that load.
• Designed to fit where 1-Pole, 277V specifications are required, reducing the risk of mismatched equipment and nuisance trips.

Practical installation tips

• Power down the service and verify that the panel is rated for 277V before replacing the breaker.
• Keep the part number (FHF16040) handy to confirm compatibility with your panel labeling.
• Store spare breakers in a dry, cool environment to maintain long-term reliability.