Eaton KDB3400C - 400 A, 600 V, 3-Pole Circuit Breaker | AmpState

Introducing the Eaton KDB3400C — a 400 A, 600 V, 3-pole molded case circuit breaker designed to protect panelboards and loadcenters from overcurrent and short circuits. Built for three-phase systems, this unit delivers dependable, site-ready protection where it matters most in residential, commercial, and light industrial settings.

Efficient panel use — The compact molded case design helps maximize available space inside panels, making it easier to organize wiring and fit protective devices without crowding the enclosure.

Stable protection you can rely on — The thermal-magnetic trip unit provides stable, repeatable protection performance, balancing fast response to short circuits with reduced nuisance trips during normal load variations.

Designed for seamless integration — Compatible with matching OEM loadcenters and panelboards, the KDB3400C simplifies replacement, maintenance, and future upgrades across existing systems.

Ideal for a range of applications — This 3-pole breaker is well-suited for three-phase distribution in residential projects with higher protection needs, commercial spaces, and light industrial environments where robust branch-circuit protection is essential.

Technical snapshot

• Manufacturer: Eaton
• Part number: KDB3400C
• 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

In practice, the Eaton KDB3400C helps you protect critical circuits—from feeders to equipment motors—without sacrificing panel layout or serviceability. Its combination of compact design, reliable trip logic, and OEM-compatible compatibility makes it a practical choice for electricians, facilities managers, and maintenance teams looking to maintain safe, efficient electrical protection across mixed-use buildings.