Eaton HMCP400L5Y - 400 A, 600 V, 3-Pole Circuit Breaker | AmpState

Meet the Eaton HMCP400L5Y—a 400 A, 600 V, 3-pole molded case circuit breaker designed to shield panelboards and loadcenters from overcurrent and short-circuit events. Built for dependable protection in demanding electrical environments, this unit combines compact design with industrial-grade reliability.

• Compact molded case design maximizes panel space, making it easier to fit into existing enclosures and leave room for future expansions.
• Thermal-magnetic trip unit provides stable, repeatable protection across varying loads, reducing nuisance trips and ensuring consistent performance during peak demand.
• OEM-compatible reliability engineered to pair with matching Eaton OEM loadcenters and panelboards for seamless installation and long-term compatibility.
• 3-pole, 400 A, 600 V configuration ideal for three-phase residential, commercial, and light industrial circuits, including feeders and branch circuits requiring robust protection.
• Versatile applications suitable for subpanels, service upgrades, and new builds where high-current protection is a must.

Technical highlights

• Manufacturer: Eaton
• Part Number: HMCP400L5Y
• 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

Why electricians and facilities managers choose the HMCP400L5Y

• Protects wiring and downstream equipment from overloads and faults, helping prevent equipment downtime and costly damage.
• Streamlined upgrades and maintenance thanks to compatibility with Eaton panelboards and loadcenters, reducing substitute-fit risks.
• Provides a reliable, high-current solution for three-phase systems in commercial spaces, light industrial facilities, and well-equipped residential setups.
• Designed for practical integration in modular panels where space efficiency and dependable performance matter most.