KD3300 - 300Amp Circuit Breaker

KD3300 - 300Amp Circuit Breaker

The KD3300 is a 300-amp, three-pole molded case circuit breaker with a combination of specifications that makes careful matching important. It's a Series C, Type KD complete breaker built on a K frame and uses a T186 trip type. If you're working on existing electrical equipment, these are the details worth checking rather than stopping at the 300A rating. Size matters, too. Its frame, breaker type, trip type, pole count, terminals, dimensions, and electrical ratings should all agree with the requirements of the equipment. When they do, the KD3300 can provide the form, fit, and function needed for a compatible application.

Key Features and Benefits

• 300A, three-pole configuration: A clearly defined configuration for equipment requiring a 300-amp, three-pole breaker.
• Complete breaker: The KD3300 is specified as a complete molded case circuit breaker, not a frame-only component.
• Series C, Type KD: These identifiers give you two important details to compare when checking compatibility with existing equipment.
• K frame and T186 trip type: Useful specifications to verify when matching the KD3300 to the breaker or equipment already in service.
• 600VAC and 250VDC ratings: Supports applications specifically designed around these stated voltage ratings.
• Line and load terminals included: The specified terminals use aluminum.
• 50–60Hz frequency rating: Another important electrical characteristic to check against the application.
  

Technical Specifications

• Catalog Number: KD3300
  
• Product Type: Molded Case Circuit Breaker
  
• Series: Series C
  
• Circuit Breaker Type: KD
  
• Configuration: Complete Breaker
  
• Frame: K
  
• Trip Type: T186
  
• Amperage Rating: 300A
  
• Poles: 3
  
• Voltage Rating: 600VAC, 250VDC
  
• Interrupt Rating at 480VAC: 35k AIC
  
• Interrupt Rating at 240VAC: 65k AIC
  
• Frequency: 50–60Hz
  
• Terminals: Line and Load
  
• Terminal Material: Aluminum
  
• Width: 5.5 in.
  
• Height: 5.5 in.
  
• Length/Depth: 4.1 in.
  
• Product Weight: 11.5 lbs.
  
• UPC: 786679349175
  
• Certification: UL Listed
  

Material Compliance and Certifications

The KD3300 is UL Listed, giving buyers a specific certification they can verify when checking installation requirements. The supplied specifications also identify aluminum as the material used for the line and load terminals.

Where It Works Best

The KD3300 300-amp circuit breaker makes the most sense for compatible electrical equipment that calls for this particular Series C, Type KD, K-frame configuration. It's especially relevant when maintaining an existing or legacy electrical system, where the goal is to match the breaker already specified for the equipment.

Start with the basics: 300 amps, three poles, and T186 trip type. From there, compare the required voltage and interrupting capacity. The KD3300 is rated 600VAC and 250VDC, with interrupting ratings of 35 kAIC at 480VAC and 65 kAIC at 240VAC.