KM3B250 - 250Amp Circuit Breaker

KM3B250 - 250Amp Circuit Breaker

The KM3B250 is a 250-amp, 3-pole Type KM3 molded case circuit breaker built around the specified Type ET 800 Ampere "KM" Frame. For maintenance work on existing electrical equipment, that frame information is every bit as useful as the breaker amperage. If you're trying to keep legacy equipment in service, include those details alongside the breaker being removed rather than relying on the 250A rating alone. The pole configuration, KM3 type, KM frame, dimensions, and applicable AIC rating all help establish whether the breaker has the required form, fit, and function for the installation.

Key Features and Benefits

• 250-amp rating for electrical equipment requiring this current.
• 3-pole configuration for applications designed around a three-pole breaker.
• Type KM3 molded case circuit breaker configuration.
• Specified with a Type ET 800 Ampere "KM" Frame, an important identifier when evaluating compatibility with existing equipment.
• 40°C temperature specification provides another nameplate characteristic to confirm against the application.
• Suitable for consideration in existing and legacy electrical systems when the complete breaker configuration corresponds with equipment requirements.
  

Technical Specifications

• Part Number: KM3B250
  
• Product Type: Molded Case Circuit Breaker
  
• Type: KM3
  
• Frame: Type ET 800 Ampere “KM” Frame
  
• Amperage: 250A
  
• Poles: 3
  
• AIC Rating at 600VAC: 22k
  
• AIC Rating at 480VAC: 30k
  
• AIC Rating 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 Shipping Weight: 40.00 lbs.
  

Material Compliance and Certifications

Specific certifications and material-compliance standards were not included in the supplied specifications for the KM3B250. For that reason, certifications such as UL listing, RoHS, REACH, or other compliance designations should not be assumed.

Where It Works Best

The KM3B250 is best considered for maintenance and replacement work involving existing or legacy electrical equipment that requires a 250A, 3-pole Type KM3 molded case circuit breaker with the specified Type ET 800 Ampere "KM" Frame.

Before installation, look beyond the catalog number. Make sure the KM3 type, 250A rating, three-pole configuration, frame designation, physical dimensions, and 40°C specification agree with the equipment. System voltage also matters because the breaker's interrupting capacity changes accordingly: 22k AIC at 600VAC, 30k AIC at 480VAC, and 42k AIC at 240VAC.