Square D | FAP16100 | Circuit Breaker | 100A | 1-Pole | 277V

For technicians safeguarding 277V circuits, the Square D FAP16100 is a precise, single-pole circuit breaker engineered for maintenance, retrofit, and replacement projects. With a 100A rating, it delivers dependable protection for essential branch circuits in commercial and industrial settings, all while aligning with Square D’s trusted engineering standards.

Key specifications

• Amperage: 100 A
• Poles: 1-Pole
• Voltage: 277 V
• Part number: FAP16100

Why this particular model matters. The FAP16100 is designed to fit systems that require a 1-pole, 277V protection device, making it a reliable choice when upgrading or replacing aging breakers in existing Square D installations. The part number serves as the best reference to confirm compatibility with your panel or enclosure before you order.

Ideal use cases

• Retrofit projects in commercial buildings where 277V branch circuits power lighting and receptacle lines.
• Replacement for aging or failed single-pole breakers in Square D panels that operate at 277V.
• Maintenance campaigns to keep electrical systems tripping accurately and safely without overhauling entire panels.

Practical considerations for procurement and installation. Before ordering, verify that the panel’s rating and pole configuration match a 1-Pole, 277V device and that the 100A current rating aligns with the protected load. Using the exact part reference—FAP16100—helps ensure a seamless fit and reliable performance in your existing Square D electrical infrastructure.