Earthing switches complete the range of disconnectors and can be:
Two different types are available (depending on the rated voltage and the rated short-time withstand current):
Under special circumstances, when the distance between the fixed contact and ground is very big, the earthing switches can be of semi-pantograph type (see also HVDC equipment).
Special earthing switches are available for the connection to ground of neutral points: in this case, the earthing switches are equipped with suitable insulators both under the supporting frame and along the vertical driving shaft.
Rated voltage: 17.5 - 800 kV
Rated short-time withstand current: up to 75 kA (3 s)
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