Eaton HMCP400X5W - 400 A, 600 V, 3-Pole Bolt-On Circuit Breaker | AmpState

Introducing the Eaton HMCP400X5W — a robust 400 A, 600 V, 3-pole bolt-on molded case circuit breaker designed to safeguard your panels with precision. Engineered for dependable branch circuit overcurrent and short-circuit protection, this unit is built to perform in demanding residential, commercial, and light industrial environments.

Key advantages

• Secure bolt-on mounting for a rigid, vibration-resistant bus connection that stays dependable even in demanding installations.
• Thermal-magnetic trip unit delivers stable, repeatable protection performance across temperature variations and fault conditions.
• OEM-compatible with matching Eaton load centers and panelboards for a seamless, plug-and-protect installation.
• Versatile for residential, commercial, and light industrial applications where large branch circuits demand robust protection.

Technical snapshot

• Manufacturer: Eaton
• Part Number: HMCP400X5W
• 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 cases

Perfect for large residential service panels, commercial distribution boards, and light industrial panels where a single protective device must handle heavy-duty branch circuits. The bolt-on design simplifies retrofit work and ensures a solid connection to the panel’s bus bars, reducing motion-related wear and arcing risk over time.

Why this matters

The HMCP400X5W isn’t just a breaker—it’s a reliable guardian for your electrical system. Its thermal-magnetic characteristics help coordinate with other protective devices, minimizing nuisance trips while delivering fast, decisive action during faults. With 3 poles and a 600 V rating, it provides comprehensive protection for multi-phase circuits common in modern panel installations.

Practical tips

• Verify panel compatibility by selecting Eaton OEM family components to ensure optimal fit and electrical coordination.
• Follow the manufacturer’s torque specifications during bolt-on mounting to maintain a secure, vibration-resistant connection.
• Periodically inspect lug connections and mounting integrity in environments with high current or vibration to maintain peak performance.