DK3400Y - 400Amp Circuit Breaker

DK3400Y - 400 Amp Circuit Breaker

When you’re dealing with high-demand electrical systems, reliability isn’t optional—it’s critical. The Eaton DK3400Y molded case circuit breaker delivers consistent, high-performance protection for commercial and industrial power distribution. Built within Eaton’s trusted Series C line, this 400-amp, three-pole breaker is engineered to handle substantial electrical loads while maintaining precise fault protection. Its compact yet durable design allows for efficient installation without sacrificing performance, making it a smart choice for professionals who need dependable circuit protection in demanding environments. With its advanced trip mechanism and strong interrupting capacity, the DK3400Y helps minimize downtime and protects valuable equipment from overloads and short circuits.

Key Features and Benefits

• High Capacity Protection: Rated at 400 amps, ideal for large-scale electrical systems
• Three-Pole Configuration: Ensures reliable protection across multiple phases
• Strong Interrupting Ratings: 65 kAIC at 240 Vac and 10 kAIC at 250 Vdc for enhanced fault handling
• Precision Trip Unit (T186): Provides accurate and consistent circuit interruption
• Shunt Trip Capability: 12–24 Vac/dc rear-mounted shunt trip with left pigtail for remote operation
• Compact, Space-Efficient Design: Optimized dimensions for easier panel integration
• Durable Construction: Built for long-term use in demanding commercial and industrial settings

Technical Specifications

• Catalog Number: DK3400Y
  
• Product Type: Molded Case Circuit Breaker
  
• Series: Eaton Series C
  
• Frame Type: K Frame
  
• Breaker Type: DK
  
• Amperage Rating: 400 A
  
• Voltage Rating: 240 Vac / 250 Vdc
  
• Frequency Rating: 50–60 Hz
  
• Interrupt Rating:
  • 65 kAIC at 240 Vac
  • 10 kAIC at 250 Vdc
• Number of Poles: 3
  
• Trip Type: T186
  
• Shunt Trip: 12–24 Vac/dc (rear-mounted, left pigtail)
  
• Terminals: Line side
  
• Dimensions (H x W x D): 5.5 in x 5.5 in x 4.1 in
  
• Weight: 11.5 lbs
  

Material Compliance and Certifications

• UL Listed: Meets stringent safety and performance standards for North American applications
• Manufactured in accordance with industry-recognized electrical protection requirements, ensuring dependable operation in regulated environments

Where It Works Best

The DK3400Y is well-suited for commercial buildings, industrial facilities, manufacturing plants, and large-scale electrical distribution systems where high amperage and reliable fault protection are essential. It performs especially well in environments that demand consistent uptime, such as data centers, processing facilities, and heavy equipment operations. Its shunt trip capability also makes it a strong fit for systems requiring remote shutdown or emergency control integration.