Eaton HMCP400X5Y - 400 A, 600 V, 3-Pole Circuit Breaker | AmpState

The Eaton HMCP400X5Y is a rugged 400A, 600V, 3-pole molded case circuit breaker engineered to protect electrical systems in panelboards and load centers. Built for reliability, it delivers precise overcurrent and short-circuit protection while optimizing space in the panel with its compact molded case design.

• Compact molded case design minimizes footprint in crowded panel spaces, helping you fit protection where it’s needed without sacrificing accessibility or serviceability.
• Thermal-magnetic trip unit provides stable, repeatable protection across varying loads and fault conditions, balancing long-term reliability with fast response to faults.
• OEM-ready compatibility designed to work with matching OEM load centers and panelboards for straightforward replacement and dependable performance.
• Versatile applications suitable for residential, commercial, and light industrial environments, delivering consistent protection for main feeds and critical branch circuits.

Key specifications

• Manufacturer: Eaton
• Part number: HMCP400X5Y
• 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 in panelboards and load centers

Why this model is a smart choice

The HMCP400X5Y is more than a breaker—it’s a strategic protection solution for controlled, reliable electrical distribution. The three-pole design ensures balanced protection across phases, which is crucial for three-phase panelboards and industrial-style loads. Its about-the-job practicality means fewer panel swaps or mismatches and more consistent performance over time.

Ideal for

• Electrical professionals upgrading or maintaining panelboards and load centers in homes, offices, retail spaces, and light industrial facilities.
• Systems requiring high-current protection with a compact footprint and OEM compatibility.
• Situations where predictable thermal-magnetic protection translates to safer, more reliable fault response.

Practical tips and considerations

When integrating the HMCP400X5Y, ensure you’re pairing it with compatible OEM load centers and panelboards to maintain calibration and labeling consistency. Follow the latest electrical codes and manufacturer installation guidelines, and torque lugs to the recommended specifications to preserve secure connections and optimal trip performance. This breaker is designed to be a robust backbone for main feeders and select branch circuits where dependable, repeatable protection matters most.