Vacuum switch tubes

A vacuum switch tube with a housing,

• which encompasses two contact pieces (2, 3) in the form of axial magnetic field contacts, which are axially movable relative to one another through a specified switching travel (S) and are each provided with a current feed bolt,
• and which has a first ceramic insulator (64) and a second ceramic insulator (65) of the same diameter (D2) arranged coaxially to it,
• each ceramic insulator encompassing a current feed bolt (4, 5) and the two ceramic insulators being joined to one another in a vacuum-tight manner at the end by means of a metal piece (67) inserted between them in the form of a switching chamber,
• cylindrical vapor shields (70, 73) being fixed to this inserted metal piece
• and the inside diameter (D2) of the ceramic insulators being less than the inside diameter (D3) of the switching chamber,
• characterized
• in that both the first (64) and the second (65) ceramic insulator each has associated with it a further, similar ceramic insulator (63, 66) coaxial and immediately adjacent to it,
• the two adjacent ceramic insulators (63, 64;
• 65, 66) each being joined to one another in a vacuum-tight manner by means of a metal piece (76, 77) inserted between them,
• in that a cylindrical vapor shield is fixed to each of the inserted metal pieces (76, 77) and
• in that all the vapor shields (70, 71, 72, 73, 74, 75) are arranged at an axial distance (Al) from one another.