Eaton KDC3400Y - 400 A, 600 V, 3-Pole Bolt-On Circuit Breaker | AmpState

Engineered for reliability in electrical distribution, the Eaton KDC3400Y is a 400 A, 600 V, 3-pole bolt-on molded case circuit breaker designed to deliver dependable branch circuit overcurrent and short-circuit protection in panelboards and load centers. Built to endure demanding environments, it combines secure mounting, precise protection, and OEM compatibility into a single, robust solution.

Key Benefits

• Rigid bolt-on mounting provides a secure, vibration-resistant bus connection, helping prevent loose connections and nuisance trips in panels with movement or vibration.
• Thermal-magnetic trip unit offers stable, repeatable protection by responding to both long-term overloads and short-circuit conditions, with minimal nuisance trips due to temperature changes.
• Three-pole design ensures balanced protection across all phases in 3‑phase systems, reducing the risk of uneven currents damaging equipment.
• 600 V rated insulation suitable for commercial and light industrial distribution, enabling safe operation across higher voltage circuits.
• OEM-ready compatibility with matching Eaton OEM load centers and panelboards, facilitating straightforward replacements and upgrades.
• Versatile application suitable for residential, commercial, and light industrial environments, from service entrances to distribution panels.

Technical Specifications

• Manufacturer: Eaton
• Part Number: KDC3400Y
• 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 Use Scenarios

When upgrading a panelboard to support higher loads, the KDC3400Y provides a robust 400 A protection point for 3‑phase distribution. In new installations, it pairs with compatible Eaton panelboards to deliver reliable protection for commercial spaces, light industrial facilities, or critical equipment fed from 3‑phase 600 V networks. Its bolt-on design is well-suited for panels where a rigid, long-lasting connection is essential in environments with vibration or where serviceability is a priority.

Practical Tips

To get the most from the KDC3400Y, ensure your panelboard is compatible with 3‑pole, bolt-on molded case breakers and rated for 600 V. Follow the mounting guidelines to secure the breaker to the bus, and verify wiring gauge and terminal torque for each connection. When replacing an older breaker, confirm the bus connection and mounting pattern align with Eaton's KDC3400Y to maintain reliable protection and ease of maintenance.