Eaton HMCP400R5 400A 3P 600V Circuit Breaker | AmpState

Introducing the Eaton HMCP400R5 — a robust 400 A, 3-pole, 600 V circuit breaker designed to protect essential power feeds in panelboards, load centers, and distributed electrical networks. When you need a reliable replacement that keeps your original design intact, this part from AmpState delivers.

Direct replacement that preserves your BOM

• Direct-fit replacement to maintain BOM alignment with the original Eaton part number, minimizing engineering changes and downtime.
• Three-pole (3P) construction for balanced three-phase protection across industrial and commercial systems.
• 400 A maximum current rating provides robust protection for main feeders and distribution circuits.
• 600 V voltage rating makes it suitable for general-purpose electrical distribution in many facilities.
• Ready-to-source from AmpState to support quick procurement and service continuity.

Smart replacement strategy for maintenance, upgrades, and spares

Stocking the HMCP400R5 helps you avoid future part mismatches during service calls. If a panel requires Eaton lineage, keeping this model on hand ensures you can restore protection without altering the existing electrical architecture. Need confirmation on fit? Message us and we’ll help verify compatibility with your panel or distribution setup.

Ideal use scenarios

• Replacing a blown or worn breaker in panelboards and load centers within industrial, commercial, or utility distribution environments.
• Spare part for service trucks and maintenance rooms to reduce downtime during outages.
• Feeder protection for three-phase circuits in motor control centers and power distribution networks.

Specifications at a glance

• Part Number: HMCP400R5
• Amperage: 400 A
• Poles: 3
• Voltage: 600 V
• Type: Circuit Breaker

Practical considerations for installation and longevity

To maximize protection and service life, match the breaker to a compatible Eaton panel, verify three-phase availability, and ensure your distribution system operates within the 600 V maximum. Maintain spare stock of the HMCP400R5 to support rapid field replacements and minimize disruption during maintenance windows.

Available from AmpState — your source for genuine Eaton components. Need help matching a part number or confirming compatibility? Message us and we’ll help you confirm fit.