Eaton HMCP400A5C - 400 A, 600 V, 3-Pole Circuit Breaker | AmpState

Meet the Eaton HMCP400A5C — a 400A, 600V, 3-pole molded-case circuit breaker designed to deliver dependable branch-circuit overcurrent and short-circuit protection in panelboards and loadcenters. Available through AmpState, this device is built to fit seamlessly into Eaton and OEM panel systems while maximizing space efficiency.

• Compact molded-case design helps you make the most of valuable panel space without sacrificing protection.
• Thermal-magnetic trip unit provides stable, repeatable protection across varying temperatures and load conditions, delivering reliable performance when it matters most.
• Three-pole configuration supports balanced three-phase circuits, ideal for commercial and light industrial applications.
• 400A, 600V rating delivers robust protection for high-load feeders and main distribution paths in multi-family, commercial, and light industrial settings.
• OEM-compatible designed to install with matching Eaton loadcenters and panelboards, ensuring straightforward retrofits and replacements.

Why this matters in real-world setups: in busy electrical panels, you need protection that responds quickly to short circuits while minimizing nuisance trips during motor start-ups or peak inrush. The HMCP400A5C’s thermal-magnetic design achieves this balance, helping safeguard wiring, equipment, and the people who rely on them — with consistent trip behavior across temperature swings and load changes.

Practical use cases

• Main feeder protection in service panels for small to mid-size commercial buildings
• Protection of three-phase feeders feeding motors, pumps, compressors, and HVAC equipment
• Distribution protection in residential-turned-commercial or light-industrial panelboards
• Replacement option for aging or difficult-to-source breakers in compatible Eaton/OEM panels

Specifications and key details

• Manufacturer: Eaton
• Part Number: HMCP400A5C
• 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

Compatibility and installation notes

Designed for use with matching OEM loadcenters and panelboards, the HMCP400A5C should be installed by qualified personnel in systems that specify 600V, 3-pole molded-case protection. Verify panelboard compatibility and ensure correct mounting, electrical clearances, and conductor sizing per the manufacturer’s guidelines to maintain optimal performance and safety.