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Which of the following medium is employed for the extinction of arc in air circuit breakers?

  • Air medium is employed for the extinction of arc in air circuit breakers.
  • When an air circuit breaker interrupts an electrical current, the contacts separate and create a gap between them.
  • This gap causes a high-voltage arc to form, damaging the circuit and creating a potential hazard.
  • To extinguish the arc, the air surrounding the contacts is rapidly compressed and expanded, which causes it to cool and extinguish the arc.
  • This process is called arc quenching and is accomplished using air's properties as a medium.