DK3400 - 400Amp Circuit Breaker

DK3400 - 400Amp Circuit Breaker

When you're maintaining an existing power distribution system, finding the right replacement circuit breaker is about more than matching an amperage rating. The Eaton DK3400 molded case circuit breaker is designed to provide the form, fit, and function required for compatible electrical systems that rely on a 400 Amp, 3-pole K-Frame breaker. Whether you're replacing a failed unit during routine maintenance or sourcing components for a facility modernization project, matching the original breaker specifications helps keep installation straightforward and minimizes unnecessary system modifications.

Part of Eaton's well-established Series C product line, the DK3400 combines a 400 Amp current rating, T186 thermal magnetic trip unit, and a 65kA interrupting capacity at 240 VAC in a complete molded case circuit breaker assembly. Designed to help protect electrical equipment from overloads and short circuits, this breaker supports the continued operation of existing electrical infrastructure while maintaining the ratings and characteristics specified by the original system design.

Key Features and Benefits

• 400 Amp continuous current rating
• Three-pole molded case circuit breaker
• Eaton Series C K-Frame construction
• Complete breaker assembly
• T186 thermal magnetic trip unit
• Line and load terminal configuration
• Aluminum terminal material
• 65kAIC interrupting capacity at 240 VAC
• 10kAIC interrupting capacity at 250 VDC
• Rated for 240 VAC and 250 VDC applications within specified limits
• Designed for operation in 50/60 Hz electrical systems
• Helps protect circuits from overloads and short circuits
• Commonly used in commercial and industrial power distribution systems

Technical Specifications

• Catalog Number: DK3400
  
• Manufacturer: Eaton
  
• Product Type: Molded Case Circuit Breaker
  
• Series: Series C
  
• Circuit Breaker Type: DK
  
• Frame Size: K-Frame
  
• Breaker Configuration: Complete Breaker
  
• Amperage Rating: 400 Amps
  
• Number of Poles: 3
  
• Voltage Rating: 240 VAC, 250 VDC
  
• Trip Unit: T186 Thermal Magnetic
  
• Interrupting Capacity: 65kAIC @ 240 VAC
  
• Interrupting Capacity (DC): 10kAIC @ 250 VDC
  
• Frequency Rating: 50/60 Hz
  
• Terminal Configuration: Line and Load Terminals
  
• Terminal Material: Aluminum
  
• Length/Depth: 14 in.
  
• Height: 6.5 in.
  
• Width: 7 in.
  
• Weight: 12.6 lbs.
  
• UPC: 786679044155
  

Material Compliance and Certifications

• UL Listed: Manufactured as part of Eaton's Series C molded case circuit breaker family.
• Application Requirements: Designed for use in electrical distribution systems requiring properly rated overcurrent protection.
• Code Compliance: Intended for installation in accordance with applicable electrical codes and equipment specifications.
• Installation Guidance: Suitable for installation and servicing by qualified electrical professionals.
• Manufacturing Standards: Manufactured to meet applicable Eaton certification and compliance requirements.
  

Where It Works Best

• Commercial electrical distribution systems
• Industrial manufacturing facilities
• Processing and production plants
• Institutional and educational campuses
• Municipal and government facilities
• Feeder circuit protection applications
• Switchboards and switchgear assemblies
• Panelboards requiring compatible K-Frame breakers
• Electrical distribution equipment maintenance projects
• Facility modernization and refurbishment programs
• Existing Eaton Series C K-Frame systems requiring a compatible replacement breaker