Eaton HMCP400K5Y 400A 600V Circuit Breaker | AmpState

Meet the Eaton HMCP400K5Y 400 A, 600 V circuit breaker—built for everyday electrical work and the backbone of reliable panel protection. Designed to slot into panelboards, load centers, and electrical distribution with precision, this breaker delivers consistent performance while keeping your Eaton-based systems neatly aligned with a direct part-number match.

Why this breaker stands out

• Exact part-number match for Eaton panelboards and load centers, minimizing downtime and installation guesswork.
• 400 A rating provides robust protection for high-demand feeders and main circuits in commercial and industrial settings.
• 600 V maximum voltage suited for typical distribution networks, ensuring compatibility across a wide range of installations.
• Reliability in daily use—built to endure routine maintenance and repeated switching without compromise.
• Ideal for maintenance teams, panel builders, and spare inventories where having the exact Eaton part matters for fast, accurate replacements.
• Easy replacement in existing Eaton installations—no adapters, no guesswork, just straightforward protection.
• Available from AmpState for dependable procurement and quick access to essential parts.

Use cases and practical scenarios

• Replacing failed breakers in service panels or distribution panels within commercial buildings or light industrial facilities.
• Stocking spare inventory for maintenance teams when uptime is critical and exact part compatibility matters.
• Fabricating new panels or expanding electrical distribution with a trusted Eaton component that aligns with existing Eaton ecosystems.
• Ensuring consistent protection for high-draw feeders where a 400 A device is the right fit.

Need help matching a part number or confirming compatibility? Message us and we’ll help you confirm fit.

Specifications at a glance

• Manufacturer: Eaton
• Part Number: HMCP400K5Y
• Product Type: Circuit Breaker
• Amperage: 400 A
• Voltage: 600 V