Medium tension circuit-breaker for indoor or outdoor use

A multi-pole medium-voltage circuit-breaker comprising one pole per phase, said circuit-breaker further comprising for each pole, an insulating feedthrough including a cylindrical first portion containing a vacuum bottle, said vacuum bottle comprising an insulating case closed by first and second metal endplates, the first metal endplate carrying a first terminal outside the case and a fixed contact inside the case, the second endplate having a moving metal rod passing therethrough in sealed manner and carrying a moving contact, the second endplate being electrically connected to said moving rod, the insulating feedthrough further including a second cylindrical portion having a metal tube disposed coaxially therein, said metal tube being mechanically connected to the vacuum bottle and electrically connected to said moving rod, said metal tube comprising a drive rod connected to said moving metal rod, the insulating feedthroughs of the poles being fixed to a common metal bar disposed substantially at the junction between the first and second portions of each feedthrough, said bar containing a control shaft common to the poles and connected to a drive mechanism, the drive rod of each pole being mechanically connected to said shaft by means of a lever hinged on an endpiece that is secured to the metal tube, and an insulating arm having a first end hinged to said lever and having a second end hinged to a crank secured to said shaft, said endpiece being mechanically and electrically connected to said metal tube and constituting a second terminal of the pole.