Understanding Circuit Breaker B, C, and D Trip Curves

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Most circuit breakers have two tripping technologies in them which makes the trip curve charts difficult to read. There is a magnetic trip curve for short circuit protection which is where the B, C, and D come from and there is a thermal trip curve which is for our longer duration overload events.

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  1. Tim Wilborne
  2. Allen Bradley PLC Training
  3. Industrial Automation
  4. PLC Programming
  5. Manufacturing
  6. Tim Wilborne
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Hey Tim, as a Maintenance Technician turning OEM Technician, this is awesome stuff! I had experience in working with in rushes and sizing for motor, but this chart is an excellent resource!

justinramkarran