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The current zero interruption, in oil and air blast circuit breakers, is achieved by

  • The current zero interruption, in oil and air blast circuit breakers, is achieved by both lengthening of the gap and cooling and blast effect.
  • When a circuit breaker opens, the current flowing through the contacts is interrupted, which causes an arc to form.
  • This arc needs to be extinguished quickly in order to prevent damage to the contacts and to the electrical system.
  • In oil and air blast circuit breakers, the arc is extinguished by using a blast of air or oil to cool and deionize the space between the contacts.
  • Lengthening of the gap is also used to help interrupt the arc.
  • By increasing the distance between the contacts, the voltage required to maintain the arc increases, which helps to extinguish the arc more quickly.