Eaton HMCP400A5X - 400 A, 600 V, 3-Pole Circuit Breaker | AmpState

Eaton HMCP400A5X is a 400 A, 600 V, 3-pole molded case circuit breaker engineered for dependable branch circuit overcurrent and short-circuit protection in panelboards and loadcenters.

Designed with space efficiency in mind, the compact molded case profile helps you maximize panel space without sacrificing protection. The three-pole configuration makes it ideal for three-phase systems common in commercial and light industrial environments, while the 600 V rating provides robust protection for higher-voltage applications.

Why this breaker stands out

• Compact molded case design enables efficient use of panel space, making it easier to fit into tight electrical rooms and crowded switchgear footprints.
• Thermal-magnetic trip unit delivers stable, repeatable protection performance, with fast magnetic response for short circuits and inverse-time thermal protection for overloads.
• OEM-friendly compatibility designed to work with matching Eaton loadcenters and panelboards for seamless installation, retrofit, or expansion.
• Three-pole configuration suited for three-phase systems, helping to protect feeders, motors, and other three-phase equipment efficiently.
• High-current capability 400 A rating makes it appropriate for medium-duty feeders and distribution paths in commercial and light industrial settings.

Ideal applications

This breaker is well-suited for residential, commercial, and light industrial environments where reliable overcurrent protection is essential. Use it in panelboards and loadcenters that service feeders, branch circuits, and motor loads, ensuring consistent protection across varied electrical demands.

What problems it solves

By combining a compact form factor with a reliable thermal-magnetic trip mechanism, the HMCP400A5X reduces nuisance trips while delivering fast response to actual faults. Its compatibility with OEM panel systems simplifies upgrades and reduces commissioning time, helping maintain safe electrical distribution with minimal disruption.

Key specifications

• Manufacturer: Eaton
• Part Number: HMCP400A5X
• Type: Thermal-magnetic molded case circuit breaker
• Amperage Rating: 400 A
• Voltage Rating: 600 V
• Number of Poles: 3
• Application: Branch circuit overcurrent and short-circuit protection

Practical tips for installation and use

Pair the HMCP400A5X with compatible Eaton panelboards or loadcenters to ensure optimal performance and coordinated protection. Verify that the system voltage, phase configuration, and feeder conductors align with the 600 V, 3-pole design, and ensure proper mounting and termination according to manufacturer guidelines for safe, reliable operation.