SF6 circuit breaker uses sulfur hexafluoride gas as an arc quenching medium. SF6 gas is used because it has high dielectric strength which acts as a good arc-quenching medium. SF6 is an electro-negative gas and has a high capacity to absorb free electrons.<\/p>\n\n\n\n

Breakers’ contacts are opened in the high-pressure flow of SF6 gas and the arc is stuck between the breaker’s contact. The free electrons in the arc are suddenly absorbed by gas to form negative immobile ions and the arc gets quenched rapidly.<\/p>\n\n\n\n

SF6 circuit breaker<\/a> is manufactured for voltage ratings from 6.6Kv to 760Kv.It is an inert, non-toxic, non-flammable gas. <\/p>\n\n\n\n

SF6 gas has a dielectric strength of 2.35 times that of air at atmospheric pressure.<\/p>\n\n\n\n