Eaton HMCP400A5Y - 400 A, 600 V, 3-Pole Circuit Breaker | AmpState

The Eaton HMCP400A5Y is a 400A, 600V, 3-pole molded case circuit breaker (MCCB) designed to deliver dependable branch circuit overcurrent and short-circuit protection in panelboards and load centers. Built for steady performance, this unit helps electrical systems handle demanding loads with a precise, repeatable trip profile.

• Compact molded case design: Optimizes panel space, leaving room for essential wiring and additional protection devices.
• Thermal-magnetic trip unit: Combines steady thermal overload sensing with immediate magnetic tripping for fast, reliable responses to both overloads and short circuits.
• OEM-compatible fit: Engineered to drop into matching Eaton load centers and panelboards, ensuring a seamless installation and consistent electrical performance.
• High-current capability: With a 400A rating and 600V rating, this breaker is well-suited as a main feeder or large branch breaker in residential, commercial, and light industrial applications.
• Versatile use cases: Ideal for service equipment, distribution panels, data centers, and industrial control panels that require robust, scalable protection.

Why this matters: the HMCP400A5Y provides synchronized protection across all three phases, reducing the risk of unbalanced currents and enabling clean shutdowns when faults occur. Its reliable, repeatable trip behavior helps protect wiring, motors, and downstream equipment from damage, while maintaining system uptime in busy electrical environments.

Who benefits most: electricians, panel designers, and facilities engineers working with Eaton-based systems who need a dependable 400A, 600V MCCB that integrates smoothly with OEM panels. If you’re upgrading existing Eaton installations or stocking spare parts for service fleets, this breaker delivers durability and predictable performance backed by Eaton’s engineering legacy.

Practical tips for optimal performance: verify panel compatibility with your specific Eaton model, follow torque specifications from the manufacturer, and ensure proper labeling and thermal management within the enclosure. Always have a qualified electrician perform installation in accordance with local codes and electrical standards.