Eaton HMCP400Y5Y - 400 A, 600 V, 3-Pole Circuit Breaker | AmpState

Eaton HMCP400Y5Y is a robust 400 A, 600 V, 3-Pole molded case circuit breaker designed to deliver dependable branch circuit overcurrent and short-circuit protection in panelboards and loadcenters. Built for reliable performance in three-phase systems, it pairs high-capacity protection with a compact footprint to maximize available space in modern electrical enclosures.

At the heart of this breaker is a thermal-magnetic trip unit, which provides stable, repeatable protection by quickly responding to both overloads and short circuits. This means fewer nuisance trips and more consistent protection for your critical circuits, even as ambient conditions fluctuate.

• Compact molded case design optimizes panel space, making it easier to fit large protection without compromising layout or accessibility.
• Thermal-magnetic trip unit delivers reliable coordination between overload protection and short-circuit protection for safer, more predictable operation.
• 600 V rating suitable for commercial and light industrial electrical distributions as a robust protective device.
• 400 A, 3-Pole configuration supports 3-phase systems and can function as main or feeder protection within panelboards and loadcenters.
• OEM compatibility designed to pair with matching Eaton OEM loadcenters and panelboards for seamless integration and simplified installation.
• Versatile applications ideal for residential, commercial, and light industrial environments where space is at a premium but protection must not be compromised.

Use cases and practical scenarios: install the HMCP400Y5Y in new or retrofit panelboards to guard large branch circuits, feed subpanels in commercial spaces, or serve as a reliable main/feeder breaker in compact, space-constrained installations. Its 3-pole design ensures balanced protection across all phases, reducing the risk of uneven loading and electrical faults in three-phase systems.

Why this matters: choosing a molded case breaker with a compact footprint and a proven thermal-magnetic trip unit translates to easier wiring, faster panel layouts, and long-term reliability in Eaton-powered systems. If you’re updating or expanding an electrical distribution with OEM-compatible hardware, the HMCP400Y5Y offers a precise fit that aligns with your existing loadcenter and panelboard ecosystem.

Technical at a glance

• Amperage rating: 400 A
• Voltage rating: 600 V
• Poles: 3
• Type: Thermal-magnetic molded case circuit breaker
• Applications: Branch circuit overcurrent and short-circuit protection in panelboards and loadcenters