Eaton KDC3400C - 400 A, 600 V, 3-Pole Circuit Breaker | AmpState

The Eaton KDC3400C is a 400 A, 600 V, 3-pole molded case circuit breaker designed to deliver dependable branch circuit overcurrent and short-circuit protection in panelboards and loadcenters. From AmpState, this device pairs Eaton’s trusted reliability with a compact form that preserves valuable panel space while delivering precise protection for 3-phase systems.

Why the Eaton KDC3400C stands out

• Compact molded case design maximizes usable space in panelboards and loadcenters, making it easier to fit into layouts with limited clearance or crowded electrical rooms.
• Thermal-magnetic trip unit delivers stable, repeatable protection by combining overload (thermal) sensing with instantaneous short-circuit protection (magnetic), helping to prevent nuisance trips while safeguarding equipment.
• 3-pole configuration suits 3-phase systems common in commercial and light industrial environments, providing coordinated protection across all phases.
• OEM compatibility designed to work with matching Eaton panelboards and loadcenters, ensuring proper fit, electrical coordination, and straightforward replacement when upgrading or maintaining panels.
• Versatile application suitable for residential, commercial, and light industrial settings where reliable protection and space efficiency matter.

Technical snapshot

• Manufacturer: Eaton
• Part number: KDC3400C
• Type: Thermal-magnetic molded case circuit breaker
• Amperage rating: 400 A
• Voltage rating: 600 V
• Number of poles: 3
• Application: Branch circuit overcurrent and short-circuit protection

Ideal use cases

• Main or feeder protection in 3-phase commercial panels where space is at a premium and robust short-circuit protection is required.
• Replacement or upgrade in existing Eaton panelboards and loadcenters to maintain consistent protection characteristics with the surrounding system.
• Small-to-midsize industrial electrical rooms that demand reliable, trip-coordinated performance across all three phases.

Practical considerations and tips

• Match the KDC3400C with the corresponding OEM loadcenter or panelboard to preserve protection coordination and ease of maintenance.
• Leverage the thermal-magnetic trip’s fast response to limit fault currents and reduce cascading damage in energized electrical setups.
• When planning installations, verify that the 400 A rating aligns with your panel’s bus rating and conductor sizing to ensure safe and compliant operation.