High Quality SF6 Circuit Breakers for Medium & High Voltage
Discover SF6 circuit breakers with IEC certification, 50-63kA breaking current, and IP40 protection for reliable power transmission.
SF6 Circuit Breaker are type of Outdoor Circuit Breaker used in AIS Substations and GIS Substations for Power Circuit Breaking. There are various types of SF6 Circuit Breakers like – Live Tank SF6 Circuit Breaker, Dead Tank SF6 Circuit Breaker.
The first high-voltage SF 6 circuit breaker with a high short-circuit current capability was produced by Westinghouse in 1959. This circuit breaker in a grounded tank (called a dead tank), could interrupt 41.8 kA under 138 kV (10,000 MV·A) and 37.6 kA under 230 kV (15,000 MV·A).
The achievement around 1983 of the first single-break 245 kV and the corresponding 420 kV to 550 kV and 800 kV, with respectively 2, 3, and 4 chambers per pole, led to the dominance of SF 6 circuit breakers in the complete range of high voltages. Several characteristics of SF 6 circuit breakers can explain their success:
The self-blast technique described above is also widely used in SF 6 generator circuit breakers, in which the contact system is driven by a low-energy, spring-operated mechanism. An example of such a device is shown in the figure below; this circuit breaker is rated for 17.5 kV and 63 kA.
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