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SF6 (Sulfur Hexaflouride) is the god of gaseous dielectrics. It is a VERY poor conductor, and when it does decompose in an arc, it re-assembles itself in short order. It is also dense, so that it sinks to the floor, and pools in the lowest spot it can get to. This also makes it great in breaking arcs, because it makes it highly thermally conductive, stealing the heat from the arc & diffusing it. SF6 breakers are generally smaller than other types (of the same handling capacity), and therefore lighter. There's nothing we've found better with high voltage.

Vacuum is decent. It has fair dielectric strength, can break an arc pretty well. It has one massive advantage over SF6: It is environmentally benign. SF6 is pretty destructive, and has a 3200 year life in the atmosphere. That's tenacity !

So, it has been suggested that if your application is below 36kv or so, you should stick with the VCBs, but you can't beat the handling of SF6 as you go higher.

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