Eaton HMCP400K5W - 400 A, 600 V, 3-Pole Bolt-On Circuit Breaker | AmpState

Engineered for dependable branch circuit protection in demanding environments, the Eaton HMCP400K5W is a 400 A, 600 V, 3-pole bolt-on molded case circuit breaker. It’s built to anchor into panelboards and loadcenters with a secure bolt-on mounting, delivering a rigid, vibration-resistant bus connection that stays put under heavy electrical load and equipment startup surges.

Why this breaker stands out

• Secure bolt-on mounting provides a rigid, vibration-resistant bus connection that maintains reliable contact over time.
• Thermal-magnetic trip unit delivers stable, repeatable protection performance across varying temperatures and load conditions, responding to both overloads and short circuits.
• Compatibility with OEM load centers and panelboards for straightforward replacements and seamless system upgrades.
• Versatile 3-pole design suits 3-phase systems common in commercial and light industrial applications while accommodating residential panelboard configurations where needed.

Technical specifications at a glance

• Manufacturer: Eaton
• Part number: HMCP400K5W
• Type: Thermal-magnetic molded case circuit breaker
• Amperage rating: 400 A
• Voltage rating: 600 V
• Number of poles: 3
• Mounting style: Bolt-on
• Application: Branch circuit overcurrent and short-circuit protection

Ideal use scenarios

• Upgrading or expanding panelboards and loadcenters in commercial spaces where a robust 3-phase protection is required.
• Replacing aging breakers in Eaton-compatible OEM panel systems to restore reliable fault protection.
• Protecting large branch circuits feeding critical equipment, HVAC systems, motors, and distribution feeders in light industrial settings.

What this means in practice

Choosing the HMCP400K5W translates to long-term reliability and ease of installation in the field. The bolt-on design facilitates solid bus connections, reducing the risk of loose contacts that can lead to nuisance trips. The thermal-magnetic trip unit provides precise coordination between overload protection and short-circuit response, helping minimize downtime and equipment damage. Compatible with matching OEM load centers and panel boards, this breaker is a practical, scalable choice for upgrades or new builds that demand dependable, high-current protection in a compact form factor.