KM3B450 - 450Amp Circuit Breaker

KM3B450 - 450Amp Circuit Breaker

The KM3B450 is the kind of breaker where the details matter. It's rated at 450 amps, has a 3-pole configuration, and uses a Type ET 800 Ampere "KM" Frame. Just as important for replacement work, you have three clearly defined interrupting ratings to work from: 22k AIC at 600VAC, 30k AIC at 480VAC, and 42k AIC at 240VAC. Compare the KM3B450 with the breaker being replaced, paying attention to the KM3 type, frame, pole count, dimensions, system voltage, and required AIC rating. When those details align with the equipment requirements, the KM3B450 may be a suitable form, fit, and function replacement for compatible legacy electrical equipment.

Key Features and Benefits

• 450A, 3-pole configuration for equipment requiring these specific electrical characteristics.
• Type KM3 molded case circuit breaker with a Type ET 800 Ampere KM frame.
• 40°C specification gives you another useful point to confirm against the existing application.
• A useful choice for compatible legacy equipment when the catalog number, frame, electrical ratings, and physical requirements agree.
• Suitable for form, fit, and functional replacement where all relevant specifications have been verified.
  

Technical Specifications

• Part Number: KM3B450
  
• Breaker Type: Molded Case Circuit Breaker (MCCB)
  
• Type: KM3
  
• Frame: Type ET 800 Ampere “KM” Frame
  
• Amperage: 450A
  
• Poles: 3
  
• Interrupting Rating at 600VAC: 22k AIC
  
• Interrupting Rating at 480VAC: 30k AIC
  
• Interrupting Rating at 240VAC: 42k AIC
  
• Temperature Specification: 40°C
  
• Width: 9.00 in.
  
• Height/Length: 15.50 in.
  
• Depth: 4.00 in.
  
• Overall Dimensions: 9.00"W x 15.50"L x 4.00"D
  
• Approximate Weight: 40.00 lbs.
  

Material Compliance and Certifications

No specific certifications or material-compliance details were included in the supplied specifications for the KM3B450. For that reason, certifications such as UL or material standards such as RoHS and REACH should not be taken for granted.

Where It Works Best

The KM3B450 makes the most sense when you're maintaining equipment that already calls for this particular breaker configuration. In other words, start with the KM3 type and 450A, 3-pole rating, then look at the rest of the details rather than assuming another breaker with the same amperage will fit.

The physical footprint is especially worth checking. At 9.00 inches wide, 15.50 inches long, and 4.00 inches deep, this isn't a dimension you want to estimate by sight. Put those measurements alongside the existing breaker and available equipment space. From there, confirm the Type ET 800 Ampere KM frame and ensure the required interrupting capacity matches the system voltage.