Bbc Brown, Boveri & Company, Limited

Jurg Ischi

Andreas Plessl

The gas-blast circuit breaker, which is preferably provided for switching medium-high voltages, has two arcing and two rated-current contacts each of which are located in a housing filled with insulating gas and operate in conjunction with each other. For purposes of a compact construction, electric connections, are carried into the interior of the housing transversely to the direction of movement of one moving contact of the two arcing contacts. The driving energy required for a switching process is intended to be kept as low as possible while retaining the compact construction. This is achieved by the fact that the moving rated-current contact is rotatably supported and that a drive, acting on the moving arcing and the moving rated-current contact has two rods which are pivoted at a driving crank, one of which rods is pivoted at the moving arcing contact and the other one of which is pivoted at the moving rated-current contact. In this arrangement, the two insulating rods are pivoted at the driving crank in such a manner that, during the disconnecting process, a thrust crank formed by the driving crank, one rod of insulating material and the moving arcing contact passes through a dead-center position before the disconnected condition has been reached.

Gas-blast circuit breaker

A compressed gas switch, preferably provided for switching medium voltages, has a casing filled with insulating gas. Two contacts are located relative to one another along an axis in this casing, which contacts, in the switched-on position, have their free ends led into a hot volume. The switch has a small installation length in the direction of the axis defining the movement of the contacts and simultaneously exhibits small contact consumption. This is achieved by the switch having current supply links led out of the casing transverse to the axis of movement of the contacts, each of which current supply links forming at least one offset in the casing. These offsets are located in a common plane and are designed in such a way that the current to be switched off flows through them in opposite directions.

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Wiler, Switzerland

Jurg Ischi