Square D | FHL16040 | Circuit Breaker | 40A | 1-Pole | 277V

Meet the Square D FHL16040 circuit breaker — a dependable single-pole protection device rated at 40 A for 277 V circuits. Designed for maintenance, retrofit, and replacement projects where exact specifications matter, this unit slots into standard panels to restore reliable overcurrent protection quickly.

• Amperage: 40 A
• Poles: 1-Pole
• Voltage: 277 V
• Part number: FHL16040
• Brand: Square D

Important compatibility notes: Confirm fit and ratings before ordering. The FHL16040 part number is the best reference for ensuring compatibility with your panel and load requirements.

Ideal applications

This 1-pole, 40 A breaker is well-suited for protecting individual branches in commercial and light industrial electrical systems that run on 277 V. Use it in maintenance scenarios, retrofit projects, or replacements where a precise match to existing specifications is essential to maintain system safety and reliability.

What makes this Square D breaker unique

With a dedicated 40 A rating and 277 V compatibility, this unit targets single-phase protection for circuits that power lighting, control circuits, or other essential loads in 277 V distributions. It’s selected specifically when the goal is to preserve original panel design and electrical protection characteristics without introducing mismatched components.

Practical guidance for use

• Keep a spare on hand for facilities with frequent panel maintenance to minimize downtime.
• When replacing, verify that the panel type accepts FHL-series breakers and that the 40 A rating aligns with the circuit’s conductor sizing and downstream equipment.
• Always rely on the part number for compatibility checks to avoid fit issues in the field.