KDC3125 - 125Amp Circuit Breaker

KDC3125 - 125Amp Circuit Breaker

If you’re searching for a KDC3125 circuit breaker, you probably already know that finding a 125-amp breaker is the easy part. The important part is making sure everything else matches the equipment you’re working on. The KDC3125 is a 125-amp, three-pole Series C Type KDC molded case circuit breaker supplied as a complete K-frame breaker with a T186 trip type. That matters in legacy electrical systems, where two breakers may share an amperage rating but differ in frame size, trip type, dimensions, terminals, or interrupting capacity.

Key Features and Benefits

• 125A, three-pole breaker: A clearly defined configuration for electrical equipment requiring a 125-amp, three-pole circuit breaker.
• Complete breaker configuration: The KDC3125 is supplied as a complete molded-case circuit breaker, rather than as a frame-only component.
• Series C, Type KDC: Important identifiers to compare with the existing breaker and equipment specifications.
• K frame with T186 trip type: Two more details that help narrow down the correct match for replacement applications.
• 600VAC and 250VDC rated: Makes the breaker's stated voltage capabilities easy to verify against the application.
• Line and load terminals included: Both connection sides are included, with aluminum terminal material specified.
• 50/60Hz operation: Suitable where the equipment requirements correspond with this frequency rating.
  

Technical Specifications

• Catalog Number: KDC3125
  
• Product Type: Molded Case Circuit Breaker
  
• Series: Series C
  
• Circuit Breaker Type: KDC
  
• Frame Type: Complete Breaker
  
• Frame: K
  
• Trip Type: T186
  
• Amperage Rating: 125A
  
• Number of Poles: 3
  
• Voltage Rating: 600VAC, 250VDC
  
• Interrupt Rating at 480VAC: 100 kAIC
  
• Interrupt Rating at 240VAC: 200 kAIC
  
• Frequency Rating: 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: 786679070895
  
• Certification: UL Listed
  

Material Compliance and Certifications

The KDC3125 is UL Listed, providing electricians, maintenance teams, and facility personnel with a specific certification to consult when reviewing installation requirements. The supplied specifications also identify aluminum as the material used for the line and load terminals.

Where It Works Best

The KDC3125 125 amp circuit breaker makes the most sense when you’re maintaining compatible existing or legacy electrical equipment that calls for this specific Series C, Type KDC, K-frame breaker configuration.

For a replacement application, start by confirming 125 amps and three poles, but don't stop there. Check the T186 trip type, the 600 VAC and 250 VDC voltage ratings, and the required interrupting capacity. The KDC3125 is rated at 100 kAIC at 480 VAC and 200 kAIC at 240 VAC.