Eaton Cutler-Hammer 4KES400T 400A 600V Circuit Breaker | AmpState

The Eaton Cutler-Hammer 4KES400T is built for everyday electrical work, delivering dependable circuit protection in panelboards, load centers, and electrical distribution networks. With a robust 400 A rating and a 600 V operating capability, this circuit breaker is designed to handle demanding commercial and light-industrial environments while maintaining reliable performance when it matters most.

Why choose the 4KES400T for your fleet or project? This model shines when a direct part-number match is essential. It’s a smart, plug-in replacement that minimizes downtime and keeps your installations code-compliant and consistent with your existing Eaton Cutler-Hammer lineup. Available from AmpState, it’s a practical addition to maintenance inventories, panel builders’ shops, and service fleets that rely on precise part matching to reduce guesswork and installation errors.

Who benefits most

• Maintenance teams maintaining and replacing protection in existing Eaton Cutler-Hammer installations
• Panel builders and electrical distributors stocking standard, ready-to-match parts
• Facilities managers and service providers seeking reliable, long-lead-time replacements
• Spare-inventory planners aiming to minimize construction delays with exact part-number availability

Practical use cases

• Replacing a blown or tripped 400 A circuit breaker in commercial panelboards or distribution boards
• Stocking a ready-to-go spare for critical feeders and main distribution circuits
• Upgrading or maintaining electrical distribution where a 600 V rating is required
• Ensuring consistency across multiple panels that use Eaton Cutler-Hammer protection devices

Specifications at a glance

• Manufacturer: Eaton Cutler-Hammer
• Part Number: 4KES400T
• Product Type: Circuit Breaker
• Amperage: 400 A
• Voltage: 600 V

If you’re unsure about fit or compatibility, AmpState is ready to help. Need help matching a part number or confirming compatibility? Message us and we’ll help you confirm fit. This commitment to precise, human-centered support ensures you get the right breaker for your panelboards and electrical distribution needs without unnecessary hassle.