Eaton KDB3400Y - 400 A, 600 V, 3-Pole Circuit Breaker | AmpState

Eaton KDB3400Y: 400A, 600V, 3-Pole Molded Case Circuit Breaker

The Eaton KDB3400Y is a rugged 400A, 600V, 3-pole molded case circuit breaker engineered to deliver dependable branch circuit protection for panelboards and loadcenters. Its compact design helps you maximize panel space without compromising protection, making it an ideal choice for residential, commercial, and light industrial installations.

Why the KDB3400Y stands out

• Space-saving molded case design: Specifically crafted to make efficient use of panel space, so you can fit more circuits in a clean, organized enclosure.
• Thermal-magnetic trip unit: Provides stable, repeatable protection with fast magnetic response to short circuits, reducing the risk of damage to downstream equipment.
• OEM-ready compatibility: Designed to pair with matching Eaton OEM load centers and panelboards for a straightforward, reliable replacement or retrofit.
• Versatile across sectors: Suitable for a range of applications—from home electrical panels to commercial spaces and light industrial setups—where robust overcurrent and short-circuit protection is required.

Technical snapshot

• Manufacturer: Eaton
• Part Number: KDB3400Y
• Type: Thermal-magnetic molded case circuit breaker
• Amperage Rating: 400A
• Voltage Rating: 600V
• Number of Poles: 3
• Application: Branch circuit overcurrent and short-circuit protection

Real-world use cases

Use the KDB3400Y in main distribution panels or subpanels where a 400A, 3-pole solution is required. It’s well-suited for three-phase service environments or multi-branch configurations in commercial spaces, light industrial equipment rooms, or large residential installations where reliable protection and compact panel integration matter most.

What this means for you

Choosing the Eaton KDB3400Y means investing in a proven protection mechanism that balances panel efficiency with robust safety. The thermal-magnetic trip provides predictable performance during overloads and instantaneous response to short circuits, helping safeguard wiring, devices, and downstream equipment while keeping installation straightforward and compliant with compatible panelboards.