KD3350 - 350Amp Circuit Breaker

KD3350 - 350Amp Circuit Breaker

With the KD3350, there are quite a few details worth checking before deciding it's the right breaker for the job. This is a 350-amp, three-pole Series C molded case circuit breaker with a Type KD configuration, K frame, and T186 trip type. It's supplied as a complete breaker, with line and load terminals specified in aluminum. That's important with legacy electrical systems, where matching 350 amps alone doesn't tell you whether a breaker is appropriate for the application.

Key Features and Benefits

• 350A, three-pole breaker: Matches applications specifically requiring this amperage and pole arrangement.
• Complete breaker configuration: The KD3350 is classified as a complete molded-case circuit breaker, not a frame-only component.
• Series C, Type KD: Useful identification details when checking the breaker against existing electrical equipment.
• K frame and T186 trip type: Both provide additional reference points for confirming the required breaker configuration.
• 600VAC and 250VDC ratings: Clearly defined voltage specifications help take some of the guesswork out of matching an existing breaker.
• Line and load terminals: Both are specified for the KD3350, with aluminum identified as the terminal material.
• 50–60Hz operation: Another specification to compare with the existing system's requirements.
  

Technical Specifications

• Catalog Number: KD3350
  
• Product Type: Molded Case Circuit Breaker
  
• Series: Series C
  
• Circuit Breaker Type: KD
  
• Frame: K
  
• Frame Type: Complete Breaker
  
• Amperage: 350A
  
• Poles: 3
  
• Voltage Rating: 600VAC, 250VDC
  
• Interrupt Rating at 480VAC: 35k AIC
  
• Interrupt Rating at 240VAC: 65k AIC
  
• Trip Type: T186
  
• Frequency: 50–60Hz
  
• Terminals: Line and Load
  
• Terminal Material: Aluminum
  
• Length/Depth: 4.1 in.
  
• Height: 5.5 in.
  
• Width: 5.5 in.
  
• Product Weight: 11.5 lbs.
  
• UPC: 786679349182
  
• Certification: UL Listed
  

Material Compliance and Certifications

The KD3350 is UL Listed. Its supplied specifications also identify aluminum as the material used for the line and load terminals.

No specific RoHS, REACH, or other material-compliance designation was included in the information provided for this breaker. Those requirements shouldn't be assumed. If a job has a particular compliance requirement, check the breaker markings and applicable product and equipment documentation before installation.

Where It Works Best

The KD3350 makes the most sense in compatible existing or legacy electrical equipment that requires this particular 350A, three-pole Series C Type KD configuration. It's a product where checking the complete specification set is far more useful than simply looking for another 350-amp breaker.

Start with the catalog number and breaker type. From there, confirm the K frame, T186 trip type, three-pole arrangement, and 600 VAC/250 VDC ratings. The required interrupting capacity should also correspond to the KD3350's ratings of 35 kAIC at 480 VAC and 65 kAIC at 240 VAC.