Eaton HFD1100L - 100 A, 277 V, 1-Pole Bolt-On Circuit Breaker | AmpState

The Eaton HFD1100L is a purpose-built 100A, 277V, 1-pole bolt-on molded case circuit breaker designed to safeguard branch circuits in panelboards and load centers. With a rugged bolt-on mounting and a precise thermal-magnetic trip system, it delivers dependable overcurrent and short-circuit protection where reliability matters most.

Why this breaker stands out

• Secure bolt-on mounting delivers a rigid, vibration-resistant bus connection, reducing movement and wear over time for steadier performance in commercial and industrial environments.
• Thermal-magnetic trip unit provides stable, repeatable protection across temperature and load variations, automatically responding to both overloads and short circuits.
• 277V specialization ideal for commercial lighting and other 277V circuits, delivering appropriate protection exactly where these systems run.
• OEM-compatible design engineered to work with matching Eaton OEM load centers and panelboards, helping maintain system integrity and warranty coverage.
• Versatile applications suitable for residential, commercial, and light industrial use—great for new builds, retrofits, or panelboard upgrades.

Ideal use scenarios

Use the HFD1100L as the main or branch protection in panelboards and load centers where 277V circuits are present. It’s a solid choice for: 277V lighting runs in offices, schools, or retail spaces; subpanel feeders in residential or light commercial projects; and replacement or upgrade of existing Eaton bolt-on breakers in compatible panels.

What it protects and how it helps your system

• Overcurrent protection shields conductors and devices from prolonged overload, preventing insulation damage and fire risk.
• Short-circuit protection detects rapid fault currents and clears them quickly to minimize equipment damage and downtime.
• Durable, molded-case construction stands up to everyday panelboard environments, offering long-term reliability.
• Simplified installation bolt-on mounting reduces installation quirks and ensures a solid connection in vibration-prone settings.

Technical specifications

• Manufacturer: Eaton
• Part Number: HFD1100L
• Type: Thermal-magnetic molded case circuit breaker
• Amperage Rating: 100A
• Voltage Rating: 277V
• Number of Poles: 1
• Mounting Style: Bolt-on
• Application: Branch circuit overcurrent and short-circuit protection

Choose the Eaton HFD1100L for reliable, industry-aligned protection that aligns with your Eaton panelboards and delivers consistent performance in modern commercial and light industrial electrical systems.