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

  • The current zero interruption, in oil and air blast circuit breaker, is achieved by lengthening of the gap or cooling the blast effect.
  • When a circuit breaker opens a circuit, an arc is created between the contacts due to the ionization of the air.
  • This arc continues to conduct current until the current reaches zero, at which point the arc must be extinguished to prevent further current flow.
  • In an oil or air blast circuit breaker, the arc is cooled and quenched by a high-velocity blast of oil or air, respectively.
  • This blast blows the arc away from the contacts and cools it, allowing the current to be interrupted.
  • The duration of the blast is carefully controlled to ensure that the arc is fully quenched and the current is interrupted at the zero crossing.