Eaton HMCP400Y5 - 400 A, 600 V, 3-Pole Circuit Breaker | AmpState

Meet the Eaton HMCP400Y5 — a 400 A, 600 V, 3-pole molded case circuit breaker built to deliver dependable branch circuit overcurrent and short-circuit protection in panelboards and load centers. This unit is purpose‑built for durable performance in demanding electrical environments, from residential panel upgrades to commercial and light industrial installations.

Compact, space‑efficient design

The molded case form factor is purposefully compact, enabling efficient use of panel space without compromising protection or reliability. Its streamlined profile helps simplify bus bar layouts and reduces enclosure footprint, making it a practical choice for newer installations and panel upgrades where space is at a premium.

Thermal‑magnetic protection you can trust

The HMCP400Y5 features a thermal‑magnetic trip unit that delivers stable, repeatable protection across a range of operating temperatures and fault currents. The thermal element handles overload protection, while the magnetic mechanism provides rapid interruption during high‑fault conditions, helping minimize damage to wiring and equipment and reducing the risk of fire hazards.

OEM‑compatible and panel‑ready

Designed to fit with matching Eaton OEM load centers and panelboards, this 3‑pole breaker ensures seamless replacement and reliable coordination within existing electrical systems. Its compatibility simplifies upgrades and ensures consistent performance within Eaton‑matched assemblies.

Ideal for a variety of applications

Whether you’re outfitting residential spaces, commercial suites, or light industrial facilities, the HMCP400Y5 delivers robust protection for branch circuits. It’s well suited for large feeders and three‑phase distribution where dependable overcurrent and short‑circuit protection is essential.

Technical snapshot

• Manufacturer: Eaton
• Part Number: HMCP400Y5
• 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

Practical guidance for installation and use

Use the Eaton HMCP400Y5 in panelboards and load centers that are designed to accept this OEM‑matched breaker. Follow standard electrical installation practices and the panel manufacturer’s guidelines to ensure proper mounting, wiring, and safe operation. This breaker is designed to provide long‑term protection for high‑demand circuits, so pairing it with correctly rated conductors and a compatible panel is key to achieving reliable performance.

Who benefits most

• Electrical contractors and engineers working on panel upgrades or new installations requiring 3‑phase protection
• Maintenance teams in commercial facilities and light industrial settings seeking dependable, maintenance‑friendly protection
• Specifiers prioritizing compatibility and streamlined replacement within Eaton‑matched systems

With the Eaton HMCP400Y5, you get a trusted combination of compact design, precise thermal‑magnetic protection, and OEM compatibility — delivering reliable, long‑term protection for your panelboards and load centers.