Double-contact switch having vacuum switching chambers

A double-contact switch, comprising:

• a first and second tubular vacuum switching chamber formed as partial switching chambers of a switching tube;
• an electrode fixed in the switching tube and arranged between the first and second vacuum switching chambers and having a first fixed contact projecting into the first vacuum switching chamber and a second fixed contact projecting into the second vacuum switching chamber;
• a first electrode arranged in the first vacuum switching chamber and movable within it-the first vacuum switching chamber in an axial direction thereof, the first electrode having a region which bears a contact and is closed off in a gastight manner relative to an exterior of the first vacuum switching chamber;
• a second electrode arranged in the second vacuum switching chamber and movable within the second vacuum switching chamber in an axial direction thereof, the second electrode having a region which bears a contact and is closed off in a gastight manner relative to an exterior of the second vacuum switching chamber,
• the second electrode being fixed with respect to the switching tube,
• wherein the first electrode for opening and closing the contacts is movable with respect to the switching tube,
• wherein
• stop means are provided such a that an axial movement of the first electrode for opening the switching contacts in the vacuum switching chambers is limited to a preset distance relative to the switching tube, and when the stop means come up against each other a mechanical impulse acting on the switching tube is generated in a direction of the axial movement of the movable electrode in order to break apart any possibly existing welding of the contacts,. and
• wherein the stop means have a step on a shaft of the first electrode and a stop face for the step, which stop face is formed by an inner end face of a guide collar for the first electrode.