Eaton HMCP400W5Y - 400 A, 600 V, 3-Pole Circuit Breaker | AmpState

Eaton HMCP400W5Y is a 400A, 600V, 3-pole molded case circuit breaker designed to deliver dependable branch circuit overcurrent and short-circuit protection in panelboards and loadcenters.

Engineered for precise, repeatable protection, the thermal-magnetic trip unit provides fast instantaneous response to short-circuit events while offering reliable long-term protection against overloads as temperatures shift. The compact molded-case design minimizes panel footprint, helping you maximize space without compromising safety or performance.

• Amperage Rating: 400A
• Voltage Rating: 600V
• Poles: 3
• Type: Thermal-magnetic molded case circuit breaker
• Protection: Branch circuit overcurrent and short-circuit protection
• Compatibility: Designed to be matched with OEM loadcenters and panelboards for seamless integration

Why this breaker matters for your electrical system

For residential, commercial, and light industrial environments, the HMCP400W5Y provides robust protection where large loads and multi‑unit circuits demand reliable interrupting capability. A 3‑pole configuration ensures balanced protection across three‑phase systems, reducing the risk of uneven loading and voltage fluctuations that can damage equipment or compromise safety. With a 600V rating, this breaker is built to handle higher transient voltages common in commercial and light industrial applications, giving you a safer, more resilient electrical distribution network.

Ideal use scenarios

• New installations in panelboards or loadcenters where space is at a premium, thanks to its compact design.
• Retrofits in Eaton-compatible panels where a high‑amperage, three‑phase protection device is required.
• Commercial HVAC, lighting, or machinery panels that demand reliable 400A protection with dependable short-circuit response.
• Residential and light industrial applications needing rigorous branch-circuit protection without frequent nuisance trips.

Practical guidance and benefits

Choosing the HMCP400W5Y means aligning with Eaton’s protected‑equipment ecosystem. Its compatibility with matching OEM loadcenters and panelboards simplifies installation, reduces mismatch risk, and supports consistent performance across your distribution system. The thermal‑magnetic trip mechanism provides predictable trip curves, so you can design protective coordination with upstream devices and downstream equipment, minimizing downtime and collateral damage when faults occur.

To get the most from this breaker, pair it with panels designed for high‑amp, three‑pole protection and follow the manufacturer's installation and torque guidelines. Ensure the panel is rated for 600V service and that the overall protection scheme matches your load profiles and safety requirements.

Whether you’re upgrading an aging service, expanding a commercial suite, or equipping a new light‑industrial installation, the Eaton HMCP400W5Y delivers reliable, space‑efficient protection with the confidence of an established electrical OEM name.

Key benefits at a glance:

• Robust 400A, 600V, 3‑pole protection for demanding circuits
• Compact design to maximize panel space
• Stable, repeatable protection via thermal‑magnetic trip
• Seamless compatibility with matching Eaton OEM loadcenters and panelboards
• Versatile for residential, commercial, and light industrial applications