KD3400 - 400Amp Circuit Breaker

KD3400 - 400Amp Circuit Breaker

Tracking down a KD3400 usually means you need a fairly specific breaker, not simply something with a 400A rating. The KD3400 is a 400-amp, three-pole Series C molded case circuit breaker with a K frame, supplied as a complete breaker. When the catalog number, K frame, T186 trip type, poles, electrical ratings, terminals, and dimensions agree with the application, the KD3400 can provide the required form, fit, and function. Properly selected, installed, and operated within its specified ratings, it's built to last in the equipment it was designed to serve.

Key Features and Benefits

• 400A, three-pole configuration: Gives you two of the first specifications to check when identifying the breaker required by existing equipment.
• Complete molded-case circuit breaker: The KD3400 is specified as a complete breaker, not a frame-only component.
• Series C, Type KD construction: Helps narrow down the correct breaker configuration for compatible equipment.
• K frame: A key identification point that should correspond with the requirements of the existing installation.
• T186 trip type: Provides another specific characteristic to verify before determining compatibility.
• 600VAC and 250VDC ratings: Clearly identifies the stated AC and DC voltage ratings.
• Line and load terminals: Both are specified, with aluminum terminal material.
• 50–60Hz operation: Makes the specified frequency range easy to confirm against the application.
  

Technical Specifications

• Catalog Number: KD3400
  
• Product Type: Molded Case Circuit Breaker
  
• Series: Series C
  
• Circuit Breaker Type: KD
  
• Frame: K
  
• Frame Type: Complete Breaker
  
• Amperage Rating: 400A
  
• Number of Poles: 3
  
• Voltage Rating: 600VAC, 250VDC
  
• Trip Type: T186
  
• Interrupt Rating at 480VAC: 35k AIC
  
• Interrupt Rating at 240VAC: 65k AIC
  
• Frequency Rating: 50–60Hz
  
• Terminals: Line and Load
  
• Terminal Material: Aluminum
  
• Product Length/Depth: 4.25 in.
  
• Product Height: 1 in.
  
• Product Width: 3.75 in.
  
• Product Weight: 11.5 lbs.
  
• UPC: 786679349199
  
• Certification: UL Listed
  

Material Compliance and Certifications

The KD3400 is UL Listed. The supplied specifications also identify aluminum as the material used for its line and load terminals.

No specific RoHS, REACH, or other material-compliance designation was included in the supplied product information, so it wouldn't be appropriate to assume those certifications. If a specific material standard or certification is required for the job, check the markings on the breaker and the applicable product and equipment documentation.

Where It Works Best

The KD3400 makes sense for compatible existing or legacy electrical equipment that specifically calls for this 400A, three-pole Type KD, K-frame configuration. In this kind of replacement work, the goal is to get the required form, fit, electrical ratings, and function right.

Start with the KD3400 catalog number, then check the details behind it. The application should correspond to the 400A rating, three-pole, K-frame, T186 trip type, and 50–60Hz frequency rating. The system voltage and the required interrupting capacity also need to be checked. The KD3400 is rated at 600VAC and 250VDC, with 35 kAIC at 480VAC and 65 kAIC at 240VAC.