Patent ID: 7253379

Claim:
A circuit breaker having an elongated inner conductor and an outer conductor which surrounds the inner conductor like a housing, wherein at least one heat pipe is provided in order to dissipate thermal energy from the inner conductor, extends from the inner conductor to the outer conductor, and has an insulating hollow body in order to form an electrical insulating gap, the heat pipe contains a working medium for dissipation of the thermal energy by vaporization of the working medium in a section of the heat pipe which is referred to as an evaporator, and by condensation of the working medium in a section of the heat pipe which is referred to as a condenser, the condenser is in close thermal contact with the outer conductor and/or has an apparatus for heat emission, the evaporator is in close thermal contact with the inner conductor, and the heat pipe also contains an auxiliary gas, in addition to the working medium, in order to increase a dielectric strength of the insulating gap.