Patent ID: 8766131

Claim:
A gas-insulated high-voltage switch comprising: a contact arrangement which includes a first contact member and a second contact member, both of the first and second contact members being movable along an axis, each of the contact members respectively including an arcing contact; a pretensioned spring; and an insulating nozzle attached at the first contact member, wherein: the arcing contact of the second contact member is supported axially displaceably against the pretensioned spring; when the contact arrangement is closed, free ends of the two arcing contacts are configured to be supported on one another to form a contact force generated by the pretensioned spring; the two arcing contacts, when the contact arrangement is opened, are configured to separate from one another, and while the contacts arrangements separate from one another, an arcing zone, which accommodates compressed arc gas, is produced which is delimited axially by the free ends of the two arcing contacts and radially by the insulating nozzle toward outside of the switch; the second contact member includes a piston/cylinder system with a compression space constituting a restoring device which communicates with the arcing zone and which, with increasing pressure of the compressed arc gas produced in the arcing zone, is configured to generate a restoring force supporting the repelling force of the pretensioned spring; and the arcing zone is connected to the compression space via an expansion space being annularly constructed around the arcing contact.