Eaton HMCP400R5 - 400 A, 600 V, 3-Pole Circuit Breaker | AmpState

Introducing the Eaton HMCP400R5 — a 400 A, 600 V, 3-pole molded case circuit breaker built for dependable branch circuit overcurrent and short-circuit protection in panelboards and loadcenters.

Where this breaker shines

• Compact molded-case design maximizes panel space without sacrificing protection, allowing efficient layouts in both new installations and panel upgrades.
• Thermal-magnetic trip unit delivers stable, repeatable protection performance for both overloads and high-current fault events, reducing nuisance trips and improving system reliability.
• OEM-ready compatibility ensures seamless substitution with matching Eaton and OEM loadcenters and panelboards, simplifying maintenance and stocking.
• 400 A at 600 V capability suits a wide range of distribution needs, from residential feeders to light commercial and small industrial applications.

What it protects and how it helps

The HMCP400R5 provides robust branch circuit protection by interrupting fault currents to prevent damage to wiring and equipment. The combined thermal and magnetic tripping mechanism responds appropriately to both sustained overloads and severe fault conditions, helping you maintain safe, code-compliant electrical distribution.

Ideal use cases

• Upgrading panelboards or loadcenters that require a reliable 3-pole, 400 A main or feeder breaker
• Residential subpanels, small to mid-size commercial spaces, and light-industrial installations needing dependable 3-phase protection
• Replacing aging or worn breakers to restore consistent protection and panel performance

Specifications at a glance

• Amperage rating: 400 A
• Voltage rating: 600 V
• Poles: 3
• Type: Thermal-magnetic molded case circuit breaker
• Manufacturer: Eaton
• Model/Part: HMCP400R5

Available from AmpState, this breaker is designed to align with Eaton’s OEM loadcenters for straightforward replacement, inventory simplicity, and dependable performance. With its compact profile and proven thermal-magnetic protection, the HMCP400R5 helps you maximize panel capacity while delivering predictable, long-lasting protection for your electrical distribution system.