Eaton EHD1090 - 90 A, 277 V, 1-Pole Bolt-On Circuit Breaker | AmpState

Eaton EHD1090 is a 1-pole, 90A bolt-on molded case circuit breaker designed to deliver dependable branch circuit overcurrent and short-circuit protection in panelboards and load centers. Built for reliable performance in demanding environments, this breaker safeguards electrical systems where 277V circuits are common.

• : provides a rigid, vibration-resistant bus connection that stays secure through equipment start-ups and ongoing operation.
• Thermal-magnetic trip unit: combines precise thermal overload protection with fast magnetic short-circuit sensing for stable, repeatable protection performance.
• OEM compatibility: engineered to be compatible with matching Eaton OEM load centers and panelboards, simplifying installation and ensuring cohesive protection across the panel.
• Versatile application: suitable for residential, commercial, and light industrial applications where 277V branch circuits require reliable protection.

Key specifications at a glance

• Manufacturer: Eaton
• Part Number: EHD1090
• Type: Thermal-magnetic molded case circuit breaker
• Amperage Rating: 90A
• Voltage Rating: 277V
• Number of Poles: 1
• Mounting Style: Bolt-on
• Application: Branch circuit overcurrent and short-circuit protection

Practical use cases

In commercial buildings with 277V lighting and equipment, the EHD1090 serves as a robust main or branch protection device for individual circuits. It’s ideal for panelboards that demand secure mounting and dependable trip behavior, reducing nuisance trips while delivering prompt response to fault conditions. For residential applications, it provides a reliable solution where higher-current 277V loads are present in mixed-use spaces or multi-unit environments. In light industrial settings, it can protect feeders and critical circuits that require steady thermal-magnetic coordination.

Why choose this Eaton breaker?

Choosing the EHD1090 means prioritizing connection integrity and predictable protection. The bolt-on design minimizes movement and arcing risk in vibration-prone installations, while the thermal-magnetic trip provides a clear, coordinated response to both overloads and short circuits. With OEM-panel compatibility, you can streamline replacement or expansion projects without sacrificing protection performance or panel harmony.

Tips for installation and care

• Verify the panelboard is rated for 277V and compatible with the EHD1090’s bolt-on style and 90A rating.
• Follow manufacturer torque and mounting guidelines to maintain the integrity of the bus connection.
• Only install in panels that specify protection for single-pole, 90A breakers of this type.
• Commission the circuit after installation by testing the trip behavior on a controlled setup and ensuring alignment with system protection coordination.

Upgrade or maintain your electrical distribution with the Eaton EHD1090—a purpose-built solution for secure, reliable 277V protection in panelboards and load centers across residential, commercial, and light industrial environments.