Eaton HMCP400J5Y - 400 A, 600 V, 3-Pole Circuit Breaker | AmpState

The Eaton HMCP400J5Y is a 400A, 600V, 3-pole molded case circuit breaker engineered to safeguard panelboards and loadcenters with precise, dependable overcurrent protection. Built for real-world electrical layouts, it’s the solid choice when you need reliable performance in demanding environments.

• Compact molded-case design frees up valuable panel space, enabling cleaner installations and easier panel hardening in tight electrical rooms.
• Thermal-magnetic trip unit delivers stable, repeatable protection by automatically coordinating overload response with instantaneous short-circuit interruption, even as ambient conditions change.
• 3-pole configuration supports three-phase distribution and ensures synchronized protection across all conductors, simplifying panel wiring and trip coordination.
• 400 A, 600 V rating handles substantial branch-circuit loads and higher voltage distribution, making it suitable for commercial and light industrial feeders as well as residential service panels.
• OEM loadcenter compatibility is built to align with matching Eaton loadcenters and panelboards, reducing installation surprises and ensuring reliable operation from the moment it’s wired in.
• Versatile application supports residential, commercial, and light industrial systems that require robust protection for main feeders and critical circuits.

Designed to solve common protection challenges, the HMCP400J5Y responds quickly to short circuits while preventing nuisance trips from minor overloads. This means less downtime, fewer maintenance calls, and a safer, more dependable electrical system overall.

Use cases and scenarios

• Protecting main feeders in service panels and subpanels for multi-tenant or commercial spaces
• Providing branch-circuit protection for heavy equipment, HVAC controls, and motor loads in light industrial settings
• Supplying reliable three-phase protection in electrical rooms that rely on compact, space-efficient breakers

Technical snapshot

• Manufacturer: Eaton
• Part/Model: HMCP400J5Y
• 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

Ideal for professionals upgrading or outfitting panels, the HMCP400J5Y combines space efficiency, precise protection, and OEM-friendly compatibility to provide a practical, long-term solution for dependable electrical safety in a range of environments.