Eaton HMCP400J5C - 400 A, 600 V, 3-Pole Circuit Breaker | AmpState

The Eaton HMCP400J5C is a robust 3-pole molded case circuit breaker designed to protect your electrical distribution from overcurrent and short-circuit events. With a 400 A rating and a 600 V maximum, this unit is purpose-built for demanding panelboards and loadcenters in residential, commercial, and light industrial settings.

Why choose the HMCP400J5C

• Compact molded-case design maximizes panel space, allowing for more organized, reliable distribution without compromising protection or performance.
• Thermal-magnetic trip unit delivers stable, repeatable protection: the thermal element handles sustained overloads, while the magnetic element responds quickly to short circuits, helping minimize equipment damage and downtime.
• OEM-compatible installation engineered to be compatible with matching OEM loadcenters and panelboards, reducing retrofit hassles and ensuring a proper fit and electrical coordination.
• Versatile application suitable for a range of environments—from home electrical rooms to commercial offices and light industrial facilities—where reliable three-phase protection is required.

Technical snapshot

• Manufacturer: Eaton
• Part Number: HMCP400J5C
• 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 loadcenters

Practical use cases

In a three-phase distribution setup, the HMCP400J5C protects large branch circuits feeding equipment and machinery, preventing damage from overloads and fault conditions. It's ideal for upgrading existing panels that require higher current protection, or for new installations where a compact, reliable 3-pole solution is needed to manage multiple downstream loads in one go. When paired with compatible OEM panels, it ensures coordinated protection and straightforward maintenance.

What makes it stand out

This breaker combines a space-conscious design with a precise, dual-mode trip system. That means you don’t just flip a switch during a fault—you get predictable, repeatable performance that aligns with your protection strategy and panel scheduling. Its compatibility with OEM loadcenters simplifies procurement and reduces the risk of mismatched components during replacement or expansion.

For engineers, electricians, and facility managers seeking dependable, three-pole protection at a 400 A capacity, the Eaton HMCP400J5C delivers clear value through efficient panel use, proven protection theory in a compact package, and seamless integration with compatible panelboards.