Eaton HMCP400L5W - 400 A, 600 V, 3-Pole Bolt-On Circuit Breaker | AmpState

Engineered for dependable branch circuit protection, the Eaton HMCP400L5W is a 400 A, 600 V, 3-pole bolt-on molded case circuit breaker designed for panelboards and loadcenters. With secure bolt-on mounting and a thermal-magnetic trip unit, it delivers precise, repeatable protection for residential, commercial, and light industrial electrical systems, while staying fully compatible with Eaton’s OEM loadcenters and panelboards.

Key benefits

• Secure bolt-on mounting provides a rigid, vibration-resistant bus connection for reliable operation in demanding environments.
• Thermal-magnetic trip unit combines overload protection with instantaneous short-circuit protection for consistent performance across time and varying loads.
• 400 A at 600 V, 3-pole design delivers robust protection for larger feeders and multi-wire circuits in a single, compact package.
• Molded case construction built to withstand the rigors of commercial and light industrial installations, reducing nuisance trips and maintenance.
• OEM loadcenter compatibility ensures straightforward replacement and reliable integration with matching Eaton panelboards and loadcenters.

Technical specifications

• Manufacturer: Eaton
• Part number: HMCP400L5W
• 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 applications

• Residential panels and subpanels requiring dependable 400 A protection for main feeders or large branch circuits
• Commercial service panels and distribution boards where reliable short-circuit interruption is critical
• Light industrial electrical distributions that demand robust, durable protection with easy maintenance and compatible OEM components

Installation & compatibility insights

The bolt-on mounting design ensures a strong mechanical connection to bus bars, delivering stable current paths even in environments with vibration or movement. Designed to work with Eaton’s matching OEM loadcenters and panelboards, the HMCP400L5W simplifies replacement and minimizes integration issues across existing installations. When selecting this breaker, verify that the host panelboard or loadcenter supports a 3-pole, 400 A, 600 V device for optimal performance and warranty alignment.

Performance you can rely on

With a thermal-magnetic trip mechanism, this breaker responds to both sustained overloads and short-circuit events, helping protect downstream equipment, wiring, and connected loads. The 400 A rating accommodates substantial feeder circuits, making it a practical choice for mid-sized commercial spaces and controlled industrial environments where predictable protection and quick fault interruption are essential. Pair it with compatible panelboards for a cohesive, maintenance-friendly electrical distribution solution.