Eaton HMCP400K5C - 400 A, 600 V, 3-Pole Circuit Breaker | AmpState

Meet the Eaton HMCP400K5C, a purpose-built 400A, 600V, 3-pole molded case circuit breaker crafted for dependable branch circuit protection in panelboards and load centers. Designed for real-world environments—from home electrical racks to light commercial installs—this breaker delivers reliable performance when it matters most.

Why this breaker stands out

• Compact molded case design maximizes panel density, freeing up space for wiring and future expansion without compromising protection.
• Thermal-magnetic trip unit provides stable, repeatable protection by blending precise overload sensing with fast short-circuit interruption, reducing nuisance trips and protecting downstream equipment.
• 3-pole configuration ensures balanced protection across all three phases, making it ideal for 3‑phase feeders and equipment that relies on synchronized phase protection.
• Guaranteed compatibility is built in—this breaker is designed to drop in with matching OEM loadcenters and panelboards, preserving electrical characteristics and safeguarding system listings.
• Versatile applications suited for residential, commercial, and light industrial environments, from upgrading aging panels to powering new office or small-scale manufacturing setups.

Technical snapshot

• Manufacturer: Eaton
• Part number: HMCP400K5C
• 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 in panelboards and load centers

Practical use, real-world scenarios

In a busy office building, the HMCP400K5C can act as a main feeder breaker for a 3‑phase panel, delivering robust protection across all major equipment loads. In a residential retrofit or light commercial project, it helps safeguard large subpanels and distribution circuits, preventing damage from overloads and short circuits. Its compact footprint is particularly valuable in cramped electrical rooms or retrofit projects where panel space is at a premium.

How it compares to other options

The combination of a molded case design with a thermal-magnetic trip unit offers a balanced solution that handles both overloads and short circuits without sacrificing space or reliability. The 3‑pole arrangement provides synchronized protection for all phases, which is essential for maintaining system stability in 3‑phase installations. And because it’s designed to work with matching Eaton loadcenters and panelboards, you get consistent trip characteristics and easier maintenance over the life of the installation.

Tips for best results

• Pair this breaker with Eaton HMCP‑series panels to ensure seamless fit and performance.
• Plan panel layout with the 3-pole design in mind for balanced protection of 3-phase equipment.
• Label circuits clearly and maintain documentation so future expansions or troubleshooting are straightforward.
• Follow manufacturer guidelines for installation torque and inspection to maintain listing and reliability.

Optimized for performance, space efficiency, and dependable protection, the Eaton HMCP400K5C is a practical, long-term solution for safeguarding heavy-duty 3‑phase electrical systems in panelboards and load centers.