Abstract: A switching apparatus includes an energy store and two measuring devices connected to the control apparatus, the energy store being connected in series between the supply connection and the power supply via the first measuring device, the control apparatus can ascertain if the supply voltage attached to the primary side of the power supply falls short of a first voltage threshold value and, via the second measuring device, if the supply voltage of the power supply attached to the secondary side of the power supply falls short of a second voltage threshold value, the control apparatus evaluates the time between falling short of the first voltage threshold value and falling short of the second voltage threshold value.

Abstract: A switching device includes an energy store and a measuring device connected to a control apparatus. The energy store is connected in series between the supply connection and the power supply. The control apparatus can monitor the energy supply of the switching device in the area between the supply connection and the power supply taking place via the supply connection via the measuring device. If the energy supply monitored by the measuring device falls into a critical range, and using the energy from the energy store: the control apparatus connects the semiconductor switch in an electrically conductive manner and then opens the second switch; and subsequently switches the semiconductor switch to an electrically non-conductive state and then opens the first switch.

Abstract: A switching device includes an energy store and a measuring device connected to a control apparatus. The energy store is connected in series between the supply connection and the power supply. The control apparatus can monitor the energy supply of the switching device in the area between the supply connection and the power supply taking place via the supply connection via the measuring device. If the energy supply monitored by the measuring device falls into a critical range, and using the energy from the energy store: the control apparatus connects the semiconductor switch in an electrically conductive manner and then opens the second switch; and subsequently switches the semiconductor switch to an electrically non-conductive state and then opens the first switch.

Abstract: A switching apparatus includes an energy store and two measuring devices connected to the control apparatus, the energy store being connected in series between the supply connection and the power supply via the first measuring device, the control apparatus can ascertain if the supply voltage attached to the primary side of the power supply falls short of a first voltage threshold value and, via the second measuring device, if the supply voltage of the power supply attached to the secondary side of the power supply falls short of a second voltage threshold value, the control apparatus evaluates the time between falling short of the first voltage threshold value and falling short of the second voltage threshold value.