Vacuum Circuit Breaker (VCB)


Vacuum Circuit Breaker (VCB)

A medium voltage vacuum breaker also known as vacuum  circuit breaker or VCB is used for  protecting the  system, specially the transformer. VCB’s  main part is  vacuum bottle  and it acts  as  arcing control medium. Higher contact resistance and lower insulation may produce higher arcing and  consequently can be caused fire or flowing overcurrent to the system. For this reason, a proper  maintenance  should  be  done  on VCB. NFPA 70B provides all the guidelines for a proper maintenance of a VCB. The capabilities of testing and inspection of VCB are as below.

Maintenance of a VCB according to NFPA 70B

  1. Visual Inspection
  2. Contact Resistance
  3. Hipot Testing
  4. Insulation Test

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