Abb Technology Ag

Johan Abrahamsson

Olaf Hunger

Max Claessens

Martin Kriegel

Martin Holstein

The switching chamber for a heavy-duty circuit breaker has a first arcing contact piece, a second arcing contact piece, a heating chamber, and an insulating nozzle. The first or second arcing contact piece can be moved by means of a drive. The heating chamber is used for temporarily storing quenching gas heated by an arc that may burn between the contact pieces. An insulating nozzle has a throat that is connected to the heating chamber, and which is used for guiding a quenching gas flow. During an opening operation, the two arcing contact pieces reach a maximum relative speed that is at least 1.3 times as great as a relative speed of the two arcing contact pieces. The relative speed being required for capacitive switching.

Switching chamber and heavy-duty circuit breaker

The heavy-duty circuit breaker contains a first moveable arcing contact piece and a second moveable arcing contact piece as well as an auxiliary drive for driving the second arcing contact piece. An arc may burn between the arcing contact pieces. The heavy-duty circuit breaker has a heating chamber for temporarily storing quenching gas heated by the arc and a throat for guiding a quenching gas flow, which throat is connected to the heating chamber by a channel. The throat can be blocked by one of the two arcing contact pieces, which is the blocking contact piece. The auxiliary drive is designed such that, during an opening operation, a movement direction reversal of the second arcing contact piece from a movement in opposite directions to a movement in the same direction of the two arcing contact pieces takes place, if the throat is no longer blocked by the blocking contact piece.

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Wettingen, Switzerland

Johan Abrahamsson