Square D FA14040C 40A 1-Pole 277 V Circuit Breaker

Meet the Square D FA14040C 40A 1-Pole 277 V Circuit Breaker — a compact, reliable safety device designed to protect 277-volt circuits in commercial and industrial electrical systems. With a 40-amp rating and a single-pole configuration, this breaker delivers targeted overcurrent protection while helping you maximize panel space and simplify wiring layouts.

• Part Number: FA14040C
• Brand: Square D
• Current rating: 40 A
• Poles: 1
• Voltage rating: 277 V

This 277-volt circuit breaker is purpose-built for commercial or light industrial applications where 277 V systems power essential loads such as lighting, control circuits, and select equipment. The 1-pole design provides dedicated protection for a single branch circuit, making it a practical choice for spaces where panel density matters and quick, straightforward replacements are valued.

Key benefits and use cases

• Precise overcurrent protection for a 277 V branch circuit, helping prevent damage from overloads without interrupting adjacent circuits.
• Space-efficient 1-pole format that fits neatly into standard Square D panels and compatible enclosures.
• Ideal for commercial lighting runs, small control circuits, and other 277 V applications within office buildings, retail spaces, and light industrial environments.
• Simple identification via clear part number (FA14040C) and consistent Square D design for quick inspections and maintenance.

Why choose this FA14040C breaker over alternatives? It delivers dedicated protection tailored to 277 V circuits in a compact, single-pole package from a trusted manufacturer. When you need reliable interruption at the right voltage and amperage for a specific branch, this Square D model offers a straightforward upgrade path or replacement in existing systems, minimizing downtime and keeping critical electrical loads protected.

Practical guidance — match this breaker to a compatible Square D panel or enclosure designed for FA-series devices, verify the circuit load aligns with the 40 A rating, and ensure proper torque and installation procedures during replacement. For best results, plan replacements in pairs or groups when upgrading an entire sub-panel or several feeders in a single project, ensuring consistent protection across the system.