Eaton HMCP400D5Y - 400 A, 600 V, 3-Pole Circuit Breaker | AmpState

The Eaton HMCP400D5Y is a 400 A, 600 V, 3-pole molded-case circuit breaker purpose-built to protect branch circuits in panelboards and loadcenters. Available through AmpState, this device is designed to deliver dependable overcurrent and short-circuit protection while fitting neatly into Eaton’s OEM panel ecosystems.

• Compact molded-case design optimizes panel space and reduces enclosure depth, enabling cleaner, more efficient panel layouts in residential, commercial, and light-industrial applications.
• Thermal-magnetic trip unit provides stable, repeatable protection by combining overload sensing with fast magnetic interruption for short circuits, helping to prevent damage and downtime.
• 400 A at 600 V rating handles substantial feeders and large branch circuits without sacrificing performance or reliability.
• 3-pole configuration supports three-phase systems and balanced protection, with coordinated trip behavior across all poles for safer, more predictable operation.
• OEM loadcenter compatibility designed to pair with matching Eaton panels and other OEM loadcenters for straightforward installation and streamlined serviceability.

This breaker is ideal for electrical professionals tasked with upgrading or expanding electrical infrastructure in homes, commercial spaces, and light industrial facilities. It delivers a robust protection solution that pairs tightly with Eaton panelboards, helping ensure protective coordination, easier maintenance, and fewer unexpected trips in demanding environments.

Why this 3-pole molded-case breaker stands out

• Precise protection the thermal-magnetic mechanism delivers a reliable response to both sustained overloads and instantaneous short circuits, reducing wear on conductors and downstream equipment.
• Space-efficient reliability its compact design frees up panel space while maintaining strong electrical protection for critical feeders.
• Seamless system integration engineered to work with Eaton’s OEM loadcenters and compatible panelboards, simplifying stocking, ordering, and field service.

Technical overview
Manufacturer: Eaton
Part number: HMCP400D5Y
Type: Thermal-magnetic molded-case circuit breaker
Amperage rating: 400 A
Voltage rating: 600 V
Poles: 3
Application: Branch circuit overcurrent and short-circuit protection