Patent ID: 6891122

Claim:
A vacuum switch tube with a housing, comprising: two contact pieces in the form of axial magnetic field contacts, which are axially movable relative to one another through a specified switching travel and are each provided with a current feed bolt; a first ceramic insulator and a second ceramic insulator of the same diameter arranged coaxially thereto, each ceramic insulator surrounding a respective current feed bolt and the two ceramic insulators being joined to one another in a vacuum-tight manner at the end by a respective metal piece inserted therebetween in the form of a switching chamber; cylindrical vapor shields being fixed to the inserted metal piece and the inside diameter of the ceramic insulators being less than an inside diameter of the switching chamber, wherein the first and the second ceramic insulator each has an associated ceramic insulator coaxial and adjacent thereto, the adjacent ceramic insulators each being joined to one another in a vacuum-tight manner by the respective metal piece inserted therebetween; and at least one of the cylindrical vapor shields is fixed to one of the inserted metal pieces, and the vapor shields are arranged at an axial distance from one another.