Abstract: Power switches are provided with measures for preventing a recommendation of the arc from the secondary current path to the main current path and/or measures for returning the current limiter during the recommutation of the light art. A corresponding arrangement for carrying out the method is provided with means in the power switch and/or current limiter for preventing a switch failure of the current limiter disposed in the secondary current path of the power switch. The current limiter can be especially a PTC current limiter.

Abstract: Methods for operating a power switch with at least one main current path and associated secondary current path with an arc extinguisher are known from the art. A current limiter can be used which switches from non-current limiting operation to the current limiting operation at high current loads. The invention is characterized by measures for returning the current limiter during the transition from the current limiting operation to the non-current limiting operation. Specifically power switches are provided with measures for preventing a recommutation of the arc from the secondary current path to the main current path and/or measures for returning the current limiter during the recommutation of the light art. A corresponding arrangement for carrying out the inventive method is provided with means (30 to 50) in the power switch (20) and/or current limiter (1) for preventing a switch failure of the current limiter (1) disposed in the secondary current path of the power switch (20).

Abstract: An electromagnetic switching device includes a contact arrangement with three contacts which couple a three-phase load to three phases of a three-phase power supply system, and disconnect the three-phase load from the three phases. Switching erosion takes place on the contacts. An overall erosion is determined for each contact, and is supplied to a drive circuit. The contact arrangement is operated by the drive circuit as a function of the overall erosion such that the overall erosion of the contacts are approximated to one another.

Abstract: A switching device with an arc extinguishing device includes filigree-shaped arc splitters of an arcing chamber to be mounted and fixed in an operationally reliable manner. Branches and bases of the arc splitters are kept apart by spacers, in particular by grooves formed on the outside of an arcing chamber insert.

Abstract: A switching device is provided having an optimally used arcing chamber. To this end, a lower arc runner plate extends into a space located behind the arcing chamber, and an upper arc runner plate is positioned off from this space by an appropriate design of an insulating strip of the arcing chamber (10). The insulating strip is provided with projecting tabs for this purpose.

Abstract: A switching device including a movable contact member. The movable contact member produces an isolating distance and includes an integral semiconductor switching element.

Abstract: The switching functions of switching a load on and off in normal operation and in fault operation are implemented in a simple manner in an electronic branch circuit switch, which is advantageously made with silicon carbide semiconductor switching elements and has a potential-free control device, a device for detection and immediate shutoff in the event of a short-circuit, and a protection device for detection and shutoff against overload currents, as well as an overvoltage limiting device.