A circuit breaker including a bellows member having a sufficient fatigue life is obtained. The circuit breaker includes a fixed electrode, a movable electrode, a container, a movable shaft, a bellows member, and a resin layer. The bellows member is disposed so as to surround a periphery of the movable shaft. The resin layer is connected to the plurality of uneven portions of the bellows member. The resin layer includes a first part, a second part, and a third part. The first part is connected to a first recess and has a first thickness. The second part is connected to a second recess and has a second thickness. The third part is connected to at least one of a plurality of intermediate recesses and has a third thickness. The third thickness is thinner than the first thickness and the second thickness.

A vacuum switch device has a housing body, a stationary electrical contact and a moving electrical contact, which is arranged within the housing body. With a movement of the moving contact towards the stationary contact, the contacts form an electrical contact. With a movement away the electrical contact is interrupted. A sliding bearing provides sliding support for the moving contact for its movement towards and away from the stationary contact. The sliding bearing has an electrically conductive material and at least partially electrically insulates the housing body. A spring element is supported on a spring support and presses the moving electrical contact in the direction of the stationary electrical contact. There is also provided a circuit with a main current path and a parallel auxiliary current path. The vacuum switch device is arranged in the auxiliary current path.

An electrical switchgear has a first switching contact piece and a second switching contact piece. The two switching contact pieces can be moved relative to one another by way of a kinematic chain. The kinematic chain has an axially movable drive element, which is guided in a guide element. A first pin is guided in a first gate and defines the trajectory of the drive element in the guide element.

A three-phase vacuum interrupter switch assembly for power distribution systems comprises an outer case having at least one window, a plurality of internal disconnect switch assemblies, and a plurality of vacuum interrupter bottle switch assemblies within the case. Each vacuum interrupter bottle switch is coupled in electrical series with a corresponding internal disconnect switch assembly. Because the open/closed state of a bottle switch is not directly observable owing to its sealed interior, a direct visible indication of the state of the three-phase vacuum interrupter switch assembly is provided by a visually detectable contact rod for each internal disconnect switch that is visible through the case window. To prevent potentially serious damage caused by arcing between the contacts of the internal disconnect switch, the internal disconnect switch is prevented from opening or closing when the bottle switches are closed. The case interior is preferably free of oil and/or SF.sub.6 gas.

The present disclosure relates to a vacuum interrupter, and particularly, to a vacuum interrupter having enhanced performance of discharging air from the interior of a bellows in a breaking operation.

A bellows protector for a vacuum interrupter with an external bellows for low, medium or high voltages has a first region, which is configured tapered and to receive a moving contact rod such that the moving contact rod is guided out of the bellows protector from an inner side of the bellows protector onto a second side outside the bellows protector. The tapered first region of the bellows protector is configured to lie against the moving contact rod such that the moving contact rod is guided through the bellows protector. A second region adjoins the first region, the second region is enlarged relative to the first region such that the bellows to be protected is received in the second region. A holding region is configured to fasten the bellows protector on or to the vacuum interrupter such that the bellows protector forms a guide for the moving contact rod.