What is SF6 Circuit Breaker?

What is SF6 Circuit Breaker? 

SF6 circuit breaker is basically known as sulfur hexafluoride circuit breaker and is a type of medium voltage circuit breaker. When sulfur hexafluoride gas is used to extinguish the arc, it is known as SF6 circuit breaker. This gas is known to extinguish the arc rapidly, as it has a very high dielectric strength and acts as an insulating medium. A large amount of arcing occurs when the fixed and moving contacts move away from each other during a trip or off condition. In SF6 circuit breakers, since the gas enclosure is arcing, the dielectric strength of the gas increases during arc formation. This automatically reduces or cancels the high current generated. SF6 circuit breakers have excellent insulating properties and high electro-negativity. It is used at voltages from 33KV to 800KV.

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