KM3B500 - 500Amp Circuit Breaker

KM3B500 - 500Amp Circuit Breaker

The KM3B500 is the kind of breaker where the numbers tell most of the story. It's a 500-amp, 3-pole Type KM3 molded case circuit breaker using the specified Type ET 800 Ampere "KM" Frame. If you're sourcing this breaker for equipment that has been in service for years, it pays to look beyond amperage. Put the old breaker and the KM3B500 specifications side by side. Check the KM3 type, frame, three-pole arrangement, physical dimensions, voltage, and interrupting rating. When those details align with the equipment requirements, the KM3B500 can be considered for form, fit, and function replacement in a compatible legacy application.

Key Features and Benefits

• 500-amp rating for equipment requiring a breaker of this amperage.
• 3-pole design for compatible three-pole applications.
• Type KM3 molded case circuit breaker (MCCB) configuration.
• Uses the specified Type ET 800 Ampere "KM" Frame.
• Specified for 40°C.
• A practical choice to evaluate when maintaining compatible legacy electrical equipment that calls for the same form, fit, ratings, and function.
  

Technical Specifications

• Part Number: KM3B500
  
• Breaker Type: Molded Case Circuit Breaker (MCCB)
  
• Type: KM3
  
• Frame: Type ET 800 Ampere “KM” Frame
  
• Amperage: 500A
  
• Number of 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.
  
• 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 details were not included in the supplied KM3B500 specifications. Because of that, certifications such as UL listing, RoHS, REACH, or other compliance standards should not be assumed.

Where It Works Best

The KM3B500 makes the most sense for existing and legacy electrical equipment that requires a 500A, 3-pole Type KM3 molded-case circuit breaker with the specified KM frame.

Before settling on it for a replacement, take a close look at the breaker coming out of the equipment. Does it have the same KM3 type and three-pole configuration? Does the 9.00" W x 15.50 "L x 4.00 "D footprint work with the existing installation? Just as important, does the system voltage correspond with the appropriate KM3B500 interrupting rating—22k at 600VAC, 30k at 480VAC, or 42k at 240VAC?