Eaton DK3400W - 400 A, 2 V, 3-Pole Bolt-On Circuit Breaker | AmpState

Eaton DK3400W is a robust 400A, 3-pole bolt-on molded case circuit breaker engineered for dependable branch circuit overcurrent and short-circuit protection in panelboards and loadcenters. Built to survive demanding environments, it delivers a secure, vibration-resistant connection and precise protective performance when it matters most.

• Secure bolt-on mounting provides a rigid, vibration-resistant bus connection that stays put in challenging installations, reducing the risk of loose connections that can compromise protection.
• Thermal-magnetic trip unit delivers stable, repeatable protection across varying loads and ambient conditions, helping prevent nuisance trips while reliably opening on overloads or short circuits.
• 3-pole design for 3-phase systems and a 400A rating make it ideal for larger panelboards and commercial/industrial distributions that require solid 3-phase protection.
• OEM-compatible with matching Eaton loadcenters and panelboards to ensure proper fit, coordinated trip characteristics, and straightforward integration into existing equipment.
• Versatile application—suitable for residential, commercial, and light industrial environments where durable, field-installable protection is essential.

Who benefits from the DK3400W?

• Electrical contractors installing or upgrading Eaton-based panelboards and loadcenters
• Facilities managers overseeing service entrances, subpanels, or distributed loads in commercial spaces
• Panel builders and integrators seeking reliable bolt-on protection for large circuits

Key use cases

• Main service disconnects or feeder protections in Eaton-compatible panelboards
• Branch circuit protection for heavy loads in commercial or light industrial settings
• Replacement or retrofit in existing systems that require a 400A, 3-pole, bolt-on solution

Technical snapshot

• Manufacturer: Eaton
• Part number: DK3400W
• Type: Thermal-magnetic molded case circuit breaker
• Amperage rating: 400A
• Voltage rating: 2V
• Number of poles: 3
• Mounting style: Bolt-on
• Application: Branch circuit overcurrent and short-circuit protection

Installation & practical guidance

• Confirm compatibility with your OEM loadcenter or panelboard before installation to ensure coordinated protection characteristics.
• Follow proper bolt-on torque specifications and mounting practices to maintain a solid, vibration-resistant connection.
• Power down the system, verify clearance, and observe all safety protocols during installation or replacement.
• Consider the 3-pole configuration for balanced 3-phase protection in commercial or light industrial electrical distributions.

The Eaton DK3400W is more than a breaker—it's a reliable backbone for safe, efficient power distribution. With its bolt-on durability, thermal-magnetic protection, and OEM-ready compatibility, it delivers dependable performance for large-discipline panels and demanding installations. Invest in a breaker that aligns with your Eaton ecosystem and keeps critical circuits protected.