Abb Patent Gmbh

Abb Ag

Patrick Claeys

Hans-Joachim Krokoszinski

Richard Kommert

Heinz-Erich Popa

Alexander Rab

Andreas Kahnert

Klaus Kling

Jürgen Dipl-Ing Hofmann

Richard Dipl-Ing Kommert

Klaus Dipl-Ing Kling

The invention proposes an electrical service device, in particular line circuit breaker or motor circuit breaker, having a housing having connection means () for the purpose of connecting busbars and/or connection lines on at least one end side, having at least one switching contact having a fixed and a movable switching contact piece, an arc () being produced in an arc prechamber area () between said fixed and movable switching contact pieces in the event of a disconnection, said arc entering a current-limiting arc-quenching device () via arc guide rails. Prechamber plates () are arranged in the region of the arc prechamber area (), return-flow channels () being formed by said prechamber plates () from the arc-quenching device () to the arc prechamber area () between the housing wall () and the prechamber plates (). The housing wall () is provided with cutouts (), which are accessible from the outside, in the region of the prechamber plates (), iron plates () being inserted into said cutouts () for the purpose of creating an AC heavy-duty switching device and permanent magnet plates () being inserted into said cutouts () for the purpose of creating a DC heavy-duty switching device.

Electrical service device having an arc prechamber area, prechamber plates and a current-limiting arc-quenching device

An electromagnetic release drive, particularly suitable for a residual current circuit breaker, includes a plunger loaded by a spring in a release direction, a permanent magnet configuration, a coil and a yoke. The coil generates in the yoke a magnetic flux opposed to the permanent magnet configuration when the coil is driven or released such that the spring force overcomes the attraction force of the permanent magnet configuration. The permanent magnet configuration and the pole shoe conducting the magnetic flux to the plunger are associated with the yoke and the plunger such that, in a first position, the plunger is located in the active range of the permanent magnet configuration and of the pole shoe and, in a second position, is located at least partly in the active range of the pole shoe. Thus, in a first position, both the magnetic flux of the coil and that of the permanent magnet configuration, the latter at least partly, run through the plunger and, in the second position of the plunger, a closed magnetic circuit is formed by the yoke, the plunger, the pole shoe, and the permanent magnet configuration. The invention achieves two advantages. First, the working point of the permanent magnet configuration is maintained even in the release position, i.e., the second position. Second, the permanent magnet configuration can be magnetized with the coil.

Electromagnetic release

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Darmstadt, Germany

Patrick Claeys