Eaton HMCP400A5 - 400 A, 600 V, 3-Pole Circuit Breaker | AmpState

Meet the Eaton HMCP400A5 — a 400 A, 600 V, 3-pole molded case circuit breaker engineered for reliable branch circuit protection in panelboards and loadcenters. Built to withstand the demands of modern electrical systems, this breaker delivers consistent performance where it matters most: protecting wiring, devices, and occupants from overcurrent and short circuits.

Why this breaker stands out

• Space-efficient design: The compact molded case form saves panel space, making it easier to fit into tight electrical enclosures without compromising protection.
• Thermal-magnetic trip unit: Combines thermal sensing for gradual overload protection with magnetic trip action for immediate response to short circuits, delivering stable, repeatable protection across a wide range of loads.
• OEM-compatible: Designed to pair seamlessly with matching Eaton OEM loadcenters and panelboards, ensuring reliable fit, wiring continuity, and straightforward replacement.
• Versatile for multiple sectors: Suitable for residential, commercial, and light industrial applications where robust branch circuit protection is essential.

Key specifications at a glance

• Manufacturer: Eaton
• Part Number: HMCP400A5
• 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

Ideal use scenarios

Efficiently protect feeder circuits in commercial panelboards housing HVAC drives, lighting power, or auxiliary loads. In residential settings, use this 3-pole unit where a three-phase supply or multi-wire branch protection is required in a compliant panel. In light industrial environments, it provides dependable protection for circuits with higher inrush or motor loads while maintaining panel density.

Practical benefits and outcomes

• Reduces nuisance trips by balancing thermal sensitivity with rapid magnetic response for short circuits.
• Supports safer, more predictable maintenance cycles thanks to a reliable trip mechanism and Eaton’s durability standards.
• Minimizes panel modification needs due to OEM compatibility, aiding quick upgrades and replacements in existing installations.
• Helps ensure compliance with electrical design intent for both new builds and retrofits in varied environments.

Installation and compatibility tips

• Always pair the HMCP400A5 with a compatible Eaton panelboard or loadcenter to guarantee full electrical and mechanical compatibility.
• Follow the manufacturer’s installation instructions for enclosure mounting, wiring, and trip settings to maximize reliability.
• Verify that the circuit’s load profile aligns with a 400 A, 600 V, 3-pole protection scheme to avoid unnecessary disconnections during normal operation.

Whether upgrading an aging panel, expanding a commercial electrical system, or supporting a robust light-industrial layout, the Eaton HMCP400A5 delivers precise protection, durable construction, and seamless compatibility. Invest in a trusted solution that keeps power flowing safely in demanding environments.