Eaton Cutler-Hammer KD3400K 400A 3P Circuit Breaker | AmpState

The Eaton Cutler-Hammer KD3400K is a purpose-built circuit breaker designed to deliver dependable protection for panelboards, load centers, and broader electrical distribution networks. This 3-pole, 400 A device is crafted for retrofit work and maintenance planning, offering a consistent part number that simplifies stocking, ordering, and service schedules across projects.

Key specifications

• Manufacturer: Eaton Cutler-Hammer
• Part Number: KD3400K
• Product Type: Circuit Breaker
• Amperage: 400 A
• Poles: 3

Where this breaker shines

• Ideal for panelboards, load centers, and electrical distribution systems that demand robust overcurrent protection.
• Perfect for retrofit projects where maintaining the exact part number streamlines procurement, compatibility checks, and future maintenance.
• Suitable for three-phase power applications that require reliable, field-proven protection at the 400 A level.

Why choose the KD3400K from AmpState

• Availability in AmpState’s catalog ensures you can source this specific model when a consistent part number matters for your project timelines.
• Compatibility support is just a message away—our team can help you confirm fit for your panelboard or distribution system, minimizing downtime.
• Trustworthy lineage—part of Eaton Cutler-Hammer’s proven protection lineup, designed to meet rigorous electrical codes and project requirements.

Use cases and practical guidance

• In construction or renovation, install the KD3400K where a 3-pole, 400 A breaker is specified to protect feeders and distribution circuits in industrial facilities, commercial buildings, or data-center enclosures.
• During maintenance planning, keep a spare KD3400K on hand to reduce equipment downtime when replacing a failed 3-pole breaker in mid-life panels.
• When coordinating with OEMs or facilities teams, the exact KD3400K part number helps maintain consistency across drawings, spare parts lists, and service records.

Practical installation tips

• Always verify that the panelboard or distribution device is listed for 3-pole, 400 A breakers of the KD family before installation.
• Follow manufacturer torque specifications and electrical codes to ensure secure connections and reliable tripping performance.
• Coordinate with AmpState to confirm compatibility and lead times if you’re matching a legacy installation or refreshing a retrofit plan.

Ready to secure dependable overcurrent protection with the KD3400K? Contact AmpState to confirm compatibility and place your order for this exact Eaton Cutler-Hammer part, keeping your electrical distribution ready for today’s demands and tomorrow’s improvements.