Eaton | KD3400Y | Circuit Breaker | 400A | 3-Pole

The Eaton KD3400Y circuit breaker is a robust, OEM solution designed for demanding 3-phase electrical environments. With a 400A rating and 3-pole configuration, this unit is built to protect high-current distribution systems while delivering reliable, factory-fit performance. When you need an exact match for Eaton panels and spare parts, the KD3400Y stands out as the precise reference you can trust.

Precision fit for Eaton panels

Designed around Eaton’s standard dimensions and specifications, the KD3400Y delivers a seamless drop-in replacement for compatible Eaton installations. Using the exact part number as your compatibility reference minimizes guesswork and reduces installation downtime, so you can keep critical equipment protected without surprises.

Key features and benefits

• 400A current rating provides solid protection for high-demand, three-phase circuits.
• 3-pole design supports standard 3-phase distribution, aligning with common industrial and commercial power systems.
• OEM accuracy KD3400Y is the precise Eaton part reference, ensuring correct fit, labeling, and mechanical compatibility with existing gear.
• Maintenance-friendly replacement engineered for straightforward retrofits and replacements in aging or upgraded panels.
• Reliability with OEM standards built to meet Eaton’s performance expectations, helping to maintain system integrity and uptime.

Ideal use cases

• Retrofits in aging Eaton distribution panels where a like-for-like, high-current 3-pole breaker is required.
• Maintenance replacements to restore protection on critical 3-phase circuits in manufacturing facilities, data centers, and large commercial buildings.
• New installations that must match legacy system specifications without deviating from OEM part references.

Compatibility and ordering tips

Note: Confirm fit and ratings before ordering. The KD3400Y part number is the best reference for compatibility, so verify that your panel or switchgear documentation lists KD3400Y for a 400A, 3-pole configuration. If you’re replacing a worn or failed breaker, cross-check the exact amperage, pole count, and manufacturer to ensure a seamless match.

Why choose this OEM solution over alternatives

Choosing the KD3400Y means prioritizing exact physical fit, electrical ratings, and labeling consistency that align with Eaton’s system architecture. This reduces the risk of misfit components, improper trip coordination, or mislabeling that can occur with non-OEM substitutes. For critical protection in large-scale electrical infrastructure, sticking with the KD3400Y ensures predictable performance and easier maintenance over the long term.