Gas-insulated electrical apparatus filled with a dielectric gas

A medium- or high-voltage gas-insulated switchgear comprising:

• a hermetically sealed enclosure that is filled with a dielectric gas, said gas comprising fluoronitrile, wherein a volume proportion of the fluoronitrile is less than or equal to 20%;
• a first electrical contact and a second electrical contact, the first electrical contact and the second electrical contact being arranged coaxially about a main axis of the enclosure,
• wherein the first electrical contact comprises a contact head including a first slot configured at an incline relative to the main axis of the enclosure,
• wherein the first electrical contact is movable axially in the enclosure between a closed position in which the first electrical contact and second electrical contact are in electrical contact with each other and an open position in which the first electrical contact and second electrical contact are spaced apart from each other,
• wherein the first slot causes current passing through the first electrical contact to have a magnetic field with a radial component,
• wherein the radial component of the magnetic field causes a rotation of an electrical arc about the main axis in the enclosure, and
• wherein the electrical arc, based on the rotation about the main axis, cools and extinguishes.