Eaton HFD1045L - 45 A, 277 V, 1-Pole Circuit Breaker | AmpState

Eaton HFD1045L is a 45A, 277V, 1-pole molded case circuit breaker designed to protect branch circuits in panelboards and loadcenters with dependable overcurrent and short-circuit protection.

Its compact molded-case design makes efficient use of limited panel space, while a thermal-magnetic trip unit provides stable, repeatable protection under varying loads and ambient conditions. The magnetic element reacts quickly to short circuits, helping prevent damage to wiring and connected equipment, and the thermal element guards against nuisance trips from gradual overloads.

Designed for seamless compatibility, the HFD1045L is made to pair with Eaton's own OEM loadcenters and panelboards, ensuring reliable fit and consistent trip characteristics across assemblies. This makes replacement, retrofits, and service simple, reducing downtime in critical electrical systems.

Key specifications and capabilities

• Amperage rating: 45 A
• Voltage rating: 277 V
• Poles: 1
• Type: Thermal-magnetic molded case circuit breaker
• Application: Branch circuit overcurrent and short-circuit protection

Ideal use cases

• Residential distribution panels where 277V branch circuits are present in multi-phase commercial spaces
• Commercial lighting and power distribution on 277V systems, where reliable protection is critical
• Light industrial panels needing compact breakers that leave space for future circuits

Why choose the Eaton HFD1045L

With its compact form factor and a trusted thermal-magnetic trip profile, this 1-pole breaker delivers predictable protection across temperatures and load conditions. By aligning with Eaton’s panelboard standards, it simplifies stocking and maintenance while delivering long-term reliability in everyday service.

Installation and compatibility tips

Ensure the HFD1045L is used in matching Eaton panelboards or loadcenters and follow the installer’s guide for wiring terminals and terminations. Keep electrical ratings consistent with the panel’s specifications, and refer to Eaton’s installation instructions for proper torque guidance and wiring practices to avoid loose connections and electrical faults.

Whether you’re upgrading an older system or stocking parts for future projects, the Eaton HFD1045L 45A 277V 1-Pole Molded Case Circuit Breaker provides targeted protection where it matters most—keeping circuits safe, panels organized, and service interruptions minimal.