Eaton HMCP400N5Y - 400 A, 600 V, 3-Pole Circuit Breaker | AmpState

Introducing the Eaton HMCP400N5Y — a 400 A, 600 V, 3-pole molded case circuit breaker engineered to deliver dependable branch circuit overcurrent and short-circuit protection in panelboards and loadcenters. Its compact molded-case design makes the most of panel space, while the thermal-magnetic trip unit provides stable, repeatable protection across a range of operating conditions.

Why this breaker stands out

• Space-efficient design: The compact molded-case footprint frees valuable panel space, making installations neater and easier to wire.
• Thermal-magnetic protection: A thermal element handles overloads with predictable trip curves, while the magnetic element quickly clears high-energy short circuits for fast, reliable fault isolation.
• Three-phase suitability: With a 3-pole configuration, it is ideal for three-phase commercial and light industrial systems.
• High-capacity performance: Rated for 400 A and 600 V, it provides robust protection for feeders and main circuits in demanding environments.
• OEM-ready compatibility: Designed to pair with matching OEM loadcenters and panelboards, ensuring coordinated protection and streamlined service.
• Versatile application range: Suitable for residential, commercial, and light industrial applications, offering flexible protection across multiple installation scenarios.

Ideal use cases

• Main feeder protection for commercial panelboards and service equipment in offices, retail spaces, or multifamily buildings.
• Feeder protection for three-phase equipment in light industrial facilities, manufacturing lines, or HVAC systems.
• Replacement or upgrade in Eaton-compatible panels to maintain consistent protection characteristics and system coordination.

How it protects your system

The HMCP400N5Y uses a thermal-magnetic trip unit to balance protection speed and selectivity. Overload conditions trigger the thermal element for a controlled, predictable response, while short-circuit events engage the magnetic element for immediate fault clearing. The result is reliable, repeatable protection that minimizes downtime and protects wiring, devices, and downstream equipment.

Compatibility and installation at a glance

Designed for use with matching OEM loadcenters and panelboards, the HMCP400N5Y ensures a coordinated protection scheme with consistent trip characteristics. When paired with Eaton’s panel ecosystem, you’ll experience straightforward installation, simpler maintenance, and dependable performance over the life of the system.

Technical specifications at a glance

• 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

Whether you’re upgrading a panel, wiring a new commercial installation, or configuring a reliable protection point in a light industrial setting, the Eaton HMCP400N5Y delivers precise protection, efficient panel use, and seamless compatibility with Eaton’s panelboard lineup for long-term reliability.