Eaton HMCP400J5W - 400 A, 600 V, 3-Pole Circuit Breaker | AmpState

The Eaton HMCP400J5W is a 400A, 600V, 3-pole molded case circuit breaker engineered to deliver reliable branch circuit overcurrent and short-circuit protection in panelboards and loadcenters. Its compact design maximizes panel space without sacrificing performance, making it a practical choice for modern electrical assemblies where layout and safety matter.

• Space-efficient molded case design: a compact footprint that frees up panel real estate for additional devices and easier wiring routing.
• Thermal-magnetic trip unit: delivers stable, repeatable protection by sensing overcurrent conditions quickly and responding consistently across operating temperatures.
• 3-pole configuration (three-phase): ideal for commercial and light industrial electrical systems that require balanced protection across all phases.
• 400A, 600V rating: supports high-current branch circuits while accommodating the voltage levels typical in panelboards and industrial panels.
• OEM panel compatibility: designed to match Eaton OEM loadcenters and panelboards for straightforward replacement and dependable form-fit integration.
• Diverse applications: well-suited for residential, commercial, and light industrial installations where dependable protection is essential.

Technical snapshot

• Manufacturer: Eaton
• Part number: HMCP400J5W
• Type: Thermal-magnetic molded case circuit breaker
• Amperage rating: 400A
• Voltage rating: 600V
• Poles: 3
• Application: Branch circuit overcurrent and short-circuit protection

Practical use cases

In residential and commercial panelboards, the HMCP400J5W provides robust protection for high-load circuits such as HVAC feeds, electric water heaters, and heavy lighting circuits. In light industrial settings, it supports mixed-use panels where space is at a premium and reliability is non-negotiable. When upgrading aging panels or retrofitting OEM systems, this breaker’s compatibility with matching Eaton loadcenters simplifies installation and maintenance, reducing downtime and complexity.

Choosing the HMCP400J5W means prioritizing safety, panel efficiency, and long-term reliability. With its solid thermal-magnetic protection and OEM-aligned design, you get a dependable solution that protects both people and equipment while keeping your electrical distribution organized and responsive to changing loads.