Eaton HMCP400F5W - 400 A, 600 V, 3-Pole Circuit Breaker | AmpState

The Eaton HMCP400F5W delivers dependable protection for high-current branch circuits in panelboards and load centers. With a 400 A rating and a 600 V capacity, this 3-pole molded case circuit breaker is designed to handle demanding residential, commercial, and light industrial environments while preserving panel space and system reliability.

Why the HMCP400F5W stands out

• Compact molded case design optimizes panel space, making it easier to fit high-capacity protection in tighter electrical rooms and compact enclosures.
• Thermal-magnetic trip unit provides stable, repeatable protection by smoothly reacting to both overload currents and short-circuit events, helping to minimize nuisance trips and improve system uptime.
• OEM-compatible reliability is built to pair with matching Eaton OEM load centers and panelboards, enabling straightforward installation, maintenance, and future upgrades without compatibility concerns.
• High-current, versatile protection for branch circuits up to 400 A at 600 V, suitable for demanding distribution setups in a variety of settings.
• Ideal for multiple sectors—residential, commercial, and light industrial applications benefit from robust protection and streamlined panel layouts.

What it is and how it works

The HMCP400F5W is a 3-pole molded case circuit breaker engineered to provide branch circuit overcurrent protection as well as short-circuit protection. Its thermal-magnetic trip mechanism combines reliable overload protection with rapid response to high-energy faults, helping protect wiring, devices, and the overall electrical system from damage and downtime.

Practical use cases

• Main distribution protection in commercial panelboards where high-current feeders require reliable, space-efficient breakers.
• Retrofit installations in existing load centers that demand an Eaton-compatible, high-amperage solution with consistent trip characteristics.
• Residential-commercial hybrids or small industrial setups where a 400 A, 3-pole device provides essential protection without oversized gear.
• New construction where compact form factors help maximize panel density without compromising protection standards.

Specifications at a glance

• Manufacturer: Eaton
• Part Number: HMCP400F5W
• 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

Installation and compatibility tips

To maximize performance and reliability, pair the HMCP400F5W with matching Eaton OEM load centers and panelboards designed for molded case breakers. Before installation, verify that the panel’s rating and bus configuration align with the 400 A, 600 V, 3-pole specifications. Regularly inspect for secure connections and ensure the breaker’s trip unit remains within rated operating conditions for consistent protection across varying temperatures and loads.