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What should I measure when performing circuit breaker testing?

 

The manufacturer should provide a list of the parameters and the range of values that should be expected. It can vary by breaker design but if no list is provided, at a minimum, the following should be measured:

  1. Contact times
  2. Max contact time difference between phases 
  3. Stroke
  4. Overtravel
  5. Rebound
  6. Velocity
  7. Coil current
  8. Station voltage
  9. Contact Resistance