What is a SF6 circuit breaker?

What is a SF6 circuit breaker?

SF6 is basically known as sulfur hexafluoride circuit breaker. And sulfur hexafluoride circuit breaker is a type of medium voltage circuit breaker. When sulfur hexafluoride gas is used to extinguish the arc, it is called an 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 stationary and moving contacts move away from each other during a trip or off condition. In this circuit breaker, as gas arcs in the enclosure, 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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