Eaton Cutler-Hammer DK3400W 400A 3P 240V Circuit Breaker | AmpState

Meet the Eaton Cutler-Hammer DK3400W, a 400A, 3‑pole, 240V circuit breaker designed to deliver dependable protection in panelboards, load centers, and electrical distribution systems. Built for OEM compatibility and long-term reliability, this part keeps your electrical infrastructure aligned with the original specifications while guarding against overloads and faults.

Key specifications

• Amperage: 400 A
• Poles: 3
• Voltage: 240 V
• Part Number: DK3400W
• Manufacturer: Eaton Cutler-Hammer
• Product Type: Circuit Breaker

This DK3400W is ideal for replacement projects and stock spares, helping you maintain BOM alignment to the original part number while ensuring seamless integration with existing Eaton-based panelboards and distribution equipment. By choosing an OEM-aligned component, you reduce the risk of fitment issues and downtime during critical maintenance windows.

Why base your choice on this DK3400W?

• OEM compatibility: specifically designed to match the original Eaton Cutler-Hammer configuration for reliable performance.
• Focused application: suitable for panelboards, load centers, and broader electrical distribution tasks where robust 400A protection is required.
• Operational continuity: stocking this part helps you keep your electrical BOM consistent and minimizes project delays during replacements or upgrades.

Who benefits most

• Facilities with Eaton-based electrical systems seeking verified, OEM-aligned replacements.
• Maintenance teams planning proactive spare inventory to reduce downtime on critical equipment.
• Engineers and contractors aiming to preserve BOM integrity and compatibility across installations.

If you’re unsure about fit or compatibility, AmpState offers support to confirm whether the DK3400W matches your exact panel or distribution setup. Need help matching a part number or confirming compatibility? Message us and we’ll help you confirm fit.