Eaton DK3400K - 400 A, 240 V, 3-Pole Circuit Breaker | AmpState

Power reliability starts with the right protection. The Eaton DK3400K is a 400A, 240V, 3-pole molded case circuit breaker designed to guard every branch circuit in panelboards and loadcenters. Built for demanding environments, this unit delivers consistent protection where it matters most.

Why you’ll value the DK3400K

• High-capacity protection: 400 A at 240 V in a compact 3-pole molded case, ideal for large feeders and demanding branch circuits without crowding your panel.
• Thermal-magnetic trip unit: Provides stable, repeatable protection that responds accurately to both overloads and short circuits, reducing nuisance trips and downtime.
• Space-efficient design: Compact molded case helps maximize panel space while maintaining robust protection, simplifying panel layouts in both new builds and upgrades.
• OEM-compatible: Engineered to drop into matching Eaton loadcenters and panelboards, ensuring a seamless, reliable fit and straightforward serviceability.
• Versatile application: Suitable for residential, commercial, and light industrial applications where dependable branch-circuit protection is essential.

Key benefits and practical use cases

Install the DK3400K in panelboards and loadcenters where you need dependable protection for large branch circuits or critical feeders. Its thermal-magnetic mechanism adapts to fluctuating loads common in commercial spaces or light industrial environments, delivering protection without compromising on performance. Whether you’re upgrading an aging panel, stocking spare parts for a service fleet, or outfitting a new installation, the DK3400K provides the reliability Eaton customers count on.

Technical snapshot

• Manufacturer: Eaton
• Part Number: DK3400K
• Type: Thermal-magnetic molded case circuit breaker
• Amperage Rating: 400 A
• Voltage Rating: 240 V
• Poles: 3
• Application: Branch circuit overcurrent and short-circuit protection in panelboards and loadcenters

Designed for installers and facility managers who need a dependable, OEM-compatible solution, the Eaton DK3400K delivers predictable protection, straightforward installation, and long-term serviceability in a compact footprint.