Sulfur hexafluoride circuit breaker is a type of circuit breaker that uses sulfur hexafluoride (SF6) gas as the arc extinguishing medium and insulation medium. Short for SF6 circuit breaker. The use of sulfur hexafluoride as an arc extinguishing medium in circuit breakers began in the early 1950s. Due to the excellent characteristics of this gas, the single break of this circuit breaker is significantly higher in voltage and current parameters than compressed air circuit breakers and low oil circuit breakers, and does not require high air pressure and a considerable number of series breaks. In the 1960s and 1970s, SF6 circuit breakers were widely used in ultra-high voltage and large capacity power systems. In the early 1980s, SF6 circuit breakers with 363 kV single break, 550 kV double break, and rated breaking currents of 80 and 100 kA were successfully developed
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