KM3B400 - 400Amp Circuit Breaker

KM3B400 - 400Amp Circuit Breaker

The KM3B400 is a 400-amp, 3-pole Type KM3 molded case circuit breaker built around the specified Type ET 800 Ampere "KM" Frame. If you're sourcing one for equipment that's already in service, the physical footprint is worth noticing right away. At 9.00 "W x 15.50 "L x 4.00" D, this breaker has a defined size that can be checked against the existing installation before the job moves forward. Rather than relying on the 400A marking alone, compare the KM3 type, KM frame, three-pole configuration, dimensions, temperature specification, and interrupting rating at your system voltage with those of the breaker being replaced and the equipment requirements. When those characteristics line up, the KM3B400 may provide the required form, fit, and function for the application.

Key Features and Benefits

• 400-amp rating for applications requiring this specific current rating.
• A 3-pole configuration provides a clear point of identification when matching existing equipment.
• Type KM3 molit'scase circuit breaker configuration.
• Built around the specified Type ET 800 Ampere “KM” Frame.
• 40°C temperature specification gives you another rating to verify against the application.
• Suitable for existing and legacy electrical systems when the complete breaker configuration matches the equipment requirements.
  

Technical Specifications

• Part Number: KM3B400
  
• Product Type: Molded Case Circuit Breaker
  
• Type: KM3
  
• Frame: Type ET 800 Ampere “KM” Frame
  
• Amperage: 400A
  
• Poles: 3
  
• AIC at 600VAC: 22k
  
• AIC at 480VAC: 30k
  
• AIC at 240VAC: 42k
  
• Temperature Specification: 40°C
  
• Width: 9.00 in.
  
• Length/Height: 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

Specific certification and material-compliance information wasn't included in the supplied specifications for the KM3B400. For that reason, UL listing, RoHS, REACH, or other certifications shouldn't be assumed from the part number or breaker type alone.

Where It Works Best

The KM3B400 is best considered for existing and new electrical equipment that requires its particular combination of 400A capacity, three-pole, Type KM3 configuration, KM frame dimensions, and voltage-specific interrupting ratings.

For replacement work, put the important numbers next to the breaker being replaced. Confirm the 9.00" W x 15.50"L x 4.00"D footprint, then make sure the appropriate AIC rating works with the system voltage.