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Ceramic tube for use in a vacuum circuit breaker, the ceramic tube (10) being cylindrical in shape with a set length and a set internal diameter. Furthermore, the ceramic tube has a cylindrical end face (11) at each end of the cylinder shape, it being possible for a metal end cap (4, 6) to be secured in a vacuum-tight manner to each cylindrical end face (11) in order to form a vacuum chamber (8). The cylindrical end face (11) is shaped in such a manner that, in the assembled state, it makes contact with the metal end cap (4, 6) at least as far as the internal diameter of the ceramic tube (10). (FIG). 1