Square D | FHF16045 | Circuit Breaker | 45A | 1-Pole | 277V

The Square D FHF16045 circuit breaker is a precise, plug-in solution for protecting 277-volt circuits with a single 1-pole design. Engineered for reliability in commercial electrical systems, this 45-amp unit provides fast, clean interruption of electrical faults to keep wiring and connected equipment safe.

Designed for maintenance, retrofit, and replacement projects where matching specs matters, the FHF16045 is the right reference point for compatibility. When ordering, rely on the part number as your strongest guide to ensure a correct fit and proper protection in your panelboard or switchboard when handling 277 V circuits.

Key specifications

• Amperage: 45 A
• Poles: 1-Pole
• Voltage rating: 277 V
• Part number reference: FHF16045
• Ideal for: maintenance, retrofit, and replacement in compatible Square D panels

Why this breaker stands out

What sets this 1-pole 45A 277V breaker apart is its exact matching of your existing protection profile. It’s a purpose-built replacement that helps maintain consistent trip characteristics and predictable performance in 277-volt circuits, reducing downtime and the guesswork involved in compatibility checks.

Use cases and application scenarios

• Restoring protection in aging commercial panels where 277V distribution is used for lighting and branch circuits.
• Retrofits that require a precise 45-amp, 1-pole solution to fit existing bus configurations without panel modifications.
• Maintenance cycles where quick, accurate part identification by number (FHF16045) minimizes sourcing delays.

Fit, compatibility, and installation tips

Before ordering, confirm fit and ratings against your panel’s listing and existing protection scheme. Use the part number FHF16045 as the primary reference for compatibility, and verify that your circuit operates at 277V with a 45A rating in a single-pole configuration. When installing, follow standard electrical safety practices: shut off power, use proper personal protective equipment, and ensure all connections are secure and compliant with local electrical codes. If you’re unsure about panel compatibility, consult a qualified electrician to validate alignment with your system’s specifications.

What you’ll gain

• Reliable, straightforward replacement that preserves protective coordination in 277V circuits.
• Streamlined sourcing with a clearly defined part number to minimize misfits and delays.
• Peace of mind from knowing you’re using a purpose-built Square D component designed for your specific amperage, voltage, and pole configuration.