Eaton HMCP400F5X - 400 A, 600 V, 3-Pole Bolt-On Circuit Breaker | AmpState

Eaton HMCP400F5X is a 400A, 600V, 3-pole bolt-on molded case circuit breaker designed to deliver dependable branch circuit overcurrent and short-circuit protection in panelboards and loadcenters. Built for solid, long-lasting performance, it combines rugged mounting with precise protection so you can trust your electrical distribution to stay safe and reliable.

• Secure bolt-on mounting provides a rigid, vibration-resistant bus connection that helps maintain optimal electrical contact even in demanding environments.
• Thermal-magnetic trip unit delivers stable, repeatable protection by combining thermal and magnetic sensing to respond quickly to faults while minimizing nuisance trips from normal load fluctuations.
• OEM-compatible design works with matching Eaton OEM loadcenters and panelboards for seamless integration, easier replacements, and scalable protection across your system.
• Versatile industrial-ready protection suitable for residential service panels, commercial distribution, and light industrial applications where dependable protection matters most.

Technical snapshot

• Manufacturer: Eaton
• Part Number: HMCP400F5X
• Type: Thermal-magnetic molded case circuit breaker
• Amperage Rating: 400A
• Voltage Rating: 600V
• Number of Poles: 3
• Mounting Style: Bolt-on
• Application: Branch circuit overcurrent and short-circuit protection

Who benefit most

This 3-pole breaker is ideal for installers and facility managers who need robust three-phase protection in panelboards and loadcenters. It’s a practical choice when upgrading existing service equipment, expanding capacity, or consolidating protection for commercial spaces and light industrial setups.

What problems does it solve?

• Prevents damage from short circuits and sustained overloads in 3-phase distributions
• Reduces vibration-related wear on bus connections through secure bolt-on mounting
• Minimizes downtime with reliable, repeatable trip behavior that matches system demand

Practical tips for installation and use

• Pair this breaker with matching Eaton loadcenters or panelboards for optimal fit and performance.
• Ensure the mounting hardware is tightened to specification to maintain the integrity of the bus connection.
• Use in applications where a dedicated 3-pole protective device is required to manage three-phase circuits safely and efficiently.
• Regularly inspect panel interiors for signs of wear and confirm that the trip unit operates within expected parameters during routine testing.

With the Eaton HMCP400F5X, you gain a robust, purpose-built solution for reliable electrical protection across residential, commercial, and light industrial environments. Its bolt-on design, thermal-magnetic protection, and OEM compatibility offer a focused, practical approach to safeguarding your distribution system and keeping power running where it matters most.