Eaton HMCP400Y5W - 400 A, 600 V, 3-Pole Bolt-On Circuit Breaker | AmpState

Engineered for demanding panel installations, the Eaton HMCP400Y5W is a 400A, 600V, 3-pole bolt-on molded case circuit breaker designed to deliver dependable branch-circuit overcurrent and short-circuit protection in panelboards and load centers. Its bolt-on mounting provides a secure, vibration-resistant bus connection that stays solid through the vibrations and temperature swings common in busy electrical rooms.

What makes it unique

• Secure bolt-on mounting ensures a rigid, vibration-resistant bus connection for long-term reliability in panel installations.
• Thermal-magnetic trip unit delivers stable, repeatable protection with precise response to both overcurrent and short-circuit events.
• OEM-ready compatibility is designed to pair with matching Eaton OEM load centers and panelboards, simplifying upgrades and replacements.
• Versatility for multiple sectors suited for residential, commercial, and light industrial applications where high-current 3-pole protection is required.

Key specifications at a glance

• Manufacturer: Eaton
• Part Number: HMCP400Y5W
• Type: Thermal-magnetic molded case circuit breaker
• Amperage Rating: 400A
• Voltage Rating: 600V
• Number of Poles: 3
• Mounting Style: Bolt-on
• Application: Branch circuit overcurrent and short-circuit protection

Ideal use cases

• Main or subfeed protection in three-phase panelboards and load centers for commercial facilities and light industrial setups.
• Upgrading aging or undersized breakers in retrofit projects where a robust bolt-on solution is required.
• Protection for large electrical loads such as motors, HVAC equipment, and distribution networks where reliable, predictable trip characteristics matter.

Installation and compatibility tips

Choose this breaker for panelboards and load centers that specify compatible bolt-on molded case breakers. Follow OEM installation instructions for mounting torque and connection alignment to preserve the integrity of the bus connection. Because the unit uses a thermal-magnetic trip mechanism, expect consistent protection curves across varying ambient temperatures and load conditions, which helps reduce nuisance trips in steady-state operation.

Why choose the HMCP400Y5W over other options

Unlike lighter-duty or plug-in alternatives, the HMCP400Y5W is built for high-current, three-phase environments where secure mounting and durable protection are critical. The bolt-on design minimizes movement and arcing risks in environments with vibration or dynamic loads, while the thermal-magnetic trip provides a dependable response to both sustained overloads and instantaneous short circuits. When paired with compatible Eaton OEM load centers and panelboards, it offers a seamless, reliable protection solution with long-term serviceability.

Who should consider this breaker

Electrical professionals upgrading industrial, commercial, or residential panels that require a 400A, 600V, 3-pole bolt-on solution. It’s ideal for facilities aiming for robust protection, easier maintenance, and compatibility with existing Eaton panelboard ecosystems.

Ready to protect your panel with a proven, high-capacity 3-pole solution? The Eaton HMCP400Y5W delivers dependable branch-circuit and short-circuit protection with a secure, vibration-resistant installation for lasting performance.