SF6 Circuit breakers are made from 72-550kV with interruption current of 20 to 63 kA and rated current of 1,200 to 12000 amps.

Because of the properties of SF6 gas such as excellent arc quenching, high electronegative nature, and excellent dielectric strength SF6 circuit breakers are popular for high voltage applications and above.

SF6 Circuit Breakers Advantages:

  • Excellent insulating, arc extinguishing, physical and chemical properties of SF6 gas is greater advantage of SF6 circuit breakers
  • The gas is non-inflammable and chemically stable. The decomposition products are non-explosive i.e, rhere is no risk of fire or explosion
  • Electrical clearances are very much reduced because of high dielectric strength of SF6
  • Its performance is not affected due to variation in atmospheric conditions
  • It gives noiseless operation it does not make sound like air-blast circuit breaker during operation
  • Therefore is no reduction in dielectric strength of SF6 since no carbon particle is formed during the arcing

SF6 Circuit Breakers Applications:

SF6 Circuit breakers are mostly employed for High voltage applications. Because of the above said features and properties of SF6 gas they are mostly employed in switching duties related to high voltage and extra high voltage applications