Eaton KDB3400X - 400 A, 600 V, 3-Pole Circuit Breaker | AmpState

Eaton KDB3400X is a 400 A, 600 V, 3-pole molded case circuit breaker engineered to deliver dependable branch circuit overcurrent and short-circuit protection in panelboards and loadcenters. Built for robust performance in demanding electrical environments, this unit helps protect wiring and equipment while keeping installations compact and organized.

• Compact molded case design maximizes panel space without sacrificing protection, making it ideal for modern loadcenter layouts.
• Thermal-magnetic trip unit provides stable, repeatable protection against both overloads and short circuits, helping to limit damage and downtime.
• Three-pole configuration supports balanced protection for three-phase circuits, suitable for wider commercial and light industrial applications.
• High-current, high-voltage rating at 400 A and 600 V, enabling it to handle demanding branch circuits in a single, reliable device.
• OEM compatibility designed to work seamlessly with matching Eaton OEM loadcenters and panelboards, simplifying installation and future maintenance.
• Versatile installation scope suitable for residential, commercial, and light industrial environments where dependable short-circuit protection is essential.

Technical snapshot

• Manufacturer: Eaton
• Part number: KDB3400X
• Type: Thermal-magnetic molded case circuit breaker
• Amperage rating: 400 A
• Voltage rating: 600 V
• Poles: 3
• Application: Branch circuit overcurrent and short-circuit protection

Practical use cases and scenarios

• In residential panels, it protects feeders and circuit branches with reliable trip performance in fault conditions.
• In commercial suites, it safeguards lighting and receptacle circuits, helping minimize disruption from electrical faults.
• In light industrial settings, it provides robust protection for motor and control circuits within panelboards and switchgear assemblies.

Why choose the KDB3400X

• Trustworthy protection that aligns with Eaton’s ecosystem of panelboards and loadcenters, reducing compatibility concerns during upgrades or replacements.
• A single, high-capacity 3-pole solution that simplifies panel design for three-phase systems while delivering precise overcurrent protection.
• Clear, practical compatibility and installation benefits for both installers and facility managers seeking long-term reliability.

Upgrade or install with confidence using the Eaton KDB3400X 400 A, 600 V, 3-pole molded case circuit breaker—a purpose-built solution for safe, efficient, and compliant electrical protection across residential, commercial, and light industrial applications.