Eaton HMCP400R5Y - 400 A, 600 V, 3-Pole Circuit Breaker | AmpState

The Eaton HMCP400R5Y is a 400 A, 600 V, 3-pole molded case circuit breaker designed to deliver dependable branch circuit protection for panelboards and load centers. Built to fit seamlessly into established Eaton systems, this breaker combines compact engineering with reliable protection, making it an ideal upgrade or installation choice for demanding electrical environments.

Key benefits that matter in the field

• Space-efficient design: The compact molded case form helps maximize panel space, simplifying layouts in crowded panels without compromising protection performance.
• Thermal-magnetic protection: A dual-action trip unit provides stable overload protection (thermal) and fast short-circuit clearance (magnetic), delivering repeatable, predictable response under varying load conditions.
• Three-pole configuration for 3-phase systems: Specifically suited for 3-phase electrical installations, aligning with common commercial and light industrial power distribution needs.
• OEM-compatible ecosystem: Engineered to pair with matching OEM load centers and panelboards, ensuring consistent electrical coordination and reliable fit.
• Versatile application range: Suitable for residential, commercial, and light industrial environments, making it a flexible choice for diversified electrical projects.

Technical snapshot at a glance

• 400 A
• 600 V
• 3
• Thermal-magnetic molded case circuit breaker
• HMCP400R5Y

Where and how you’ll use it

• Main or branch circuit protection in commercial panelboards and residential/light commercial load centers where 3-phase distribution is required
• Upgrading protection in existing Eaton-powered installations to enhance overcurrent and short-circuit response
• New installations that demand a compact breaker with reliable trip performance in constrained panel spaces

Practical considerations for installation and use

Choose the HMCP400R5Y when you need a rugged, compatible solution that aligns with OEM panelboards. Ensure proper mounting to maintain alignment with bus bars and follow standard electrical installation practices for torque and connection integrity. This breaker’s thermal-magnetic trip unit is designed to deliver stable protection across a range of operating temperatures and load profiles, reducing nuisance trips while maintaining safety against short circuits.

Why this Eaton breaker stands out

Unlike generic substitutes, the HMCP400R5Y is purpose-built to integrate with Eaton’s panelboard ecosystem, providing coordinated protection and dependable performance in real-world installations. The 3-pole design is ready for 3-phase applications, and its compact footprint helps you maximize panel capacity without sacrificing protection quality. Whether you’re protecting motors, feeders, or critical distribution circuits, this breaker offers precise, repeatable protection that electricians trust in residential, commercial, and light industrial settings.