DK3300W - 300Amp Circuit Breaker

DK3300W - 300 Amp Circuit Breaker

If you’re working with serious electrical loads, you already know the breaker isn’t the place to cut corners. The Eaton DK3300W is built for that reality. This is a 300-amp, three-pole molded case circuit breaker designed to quietly do its job—protect your system, prevent damage, and keep everything running without interruption. It’s part of Eaton’s Series C line, which has a long track record in the field, not just on paper. What stands out here is the balance. You’ve got a compact K-frame that doesn’t eat up panel space, paired with a high interrupting capacity that can handle real fault conditions. The T186 trip unit responds the way you want it to—fast and consistent—so you’re not second-guessing your protection when it matters most. Whether you’re maintaining an existing setup or building out something new, this breaker fits into environments where reliability isn’t optional.

Key Features and Benefits

• 300-amp capacity suited for demanding electrical systems
• High interrupting rating (65 kAIC at 240 VAC) for solid fault protection
• Three-pole design for three-phase power distribution
• T186 trip unit delivers consistent, dependable tripping performance
• Compact K-frame helps conserve panel space
• Works with both 240 VAC and 250 VDC applications
• Backed by Eaton’s well-established Series C design

Technical Specifications

• Catalog Number: DK3300W
  
• UPC: 786679044674
  
• Type: Molded Case Circuit Breaker
  
• Series: Series C
  
• Frame: K Frame
  
• Amperage: 300A
  
• Voltage Rating: 240 VAC / 250 VDC
  
• Frequency: 50–60 Hz
  
• Interrupt Rating:
  • 65 kAIC @ 240 VAC
  • 10 kAIC @ 250 VDC
• Poles: 3
  
• Trip Type: T186
  
• Terminals: Without terminals
  
• Dimensions: 5.5" H × 5.5" W × 4.1" D
  
• Weight: 11.35 lbs
  

Material Compliance and Certifications

• UL Listed for use in accordance with U.S. safety standards
• Manufactured to meet established industry requirements for performance and protection

Where It Works Best

• You’ll typically find the DK3300W in commercial and industrial settings where higher amperage and dependable protection are required. Think manufacturing equipment, HVAC systems, motor control centers, and main distribution panels—places where downtime is expensive and protection needs to be consistent.