Eaton HMCP400Y5X - 400 A, 600 V, 3-Pole Circuit Breaker | AmpState

Powerful protection for panelboards and loadcenters in demanding environments—the Eaton HMCP400Y5X is a 400 A, 600 V, 3-pole molded case circuit breaker built to keep critical circuits safe. Whether wiring a residential subpanel, a commercial distribution board, or light industrial panels, this unit delivers reliable, code-aligned protection when it matters most.

• Compact molded case design—minimizes footprint to maximize panel space and allow clean, organized installations in dense panels.
• Thermal-magnetic trip unit—provides stable, repeatable protection against both overloads and short-circuits with fast, predictable tripping, reducing nuisance trips and equipment damage.
• 400 A, 600 V, 3-pole configuration—handles three-phase feeders and large branch circuits with a single, rugged device designed for heavy-duty service.
• OEM-compatible—designed to pair with matching Eaton OEM loadcenters and panelboards, ensuring proper fit, listing, and straightforward installation without compatibility headaches.
• Versatile across settings—suitable for residential, commercial, and light industrial applications, from apartment buildings to small manufacturing or data-collection environments, where stable protection is critical.

In practice, the HMCP400Y5X shines when you need a high-current solution that does not consume valuable panel space. The 3-pole design is ideal for three-phase systems common in commercial and industrial projects, reducing the number of devices inside the panel and simplifying wiring. The thermal-magnetic trip unit gives you deterministic behavior—overcurrent protection that trips on genuine overloads while resisting nuisance trips from normal inrush currents, thanks to its designed trip curve.

Technical specifications

• Manufacturer: Eaton
• Part number: HMCP400Y5X
• 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