Circuit arrangement

A circuit arrangement comprising:

• a switching unit having an input side connected to receive a preamble signal;
• a switching element having a switch position conducting a supply signal;
• and
• a control unit connected to said switching element and said switching unit and configured to provide the supply signal in dependence on the switch position of said switching element;
• said switching unit being configured to supply and control, as a function of the preamble signal, predefined components of the circuit for turning on said switching element;
• said switching unit being configured to detect, after said switching element has been switched on, a presence of the supply signal and, in dependence thereof, to switch over to supplying the predefined components by way of the supply signal;
• said switching unit including a switchover unit connected to receive the preamble signal, the supply signal, and a further supply signal;
• said switchover unit having a detection unit, a first switch connected to conduct the preamble signal or the supply signal and a second switch connected to conduct the further supply signal, said detection unit, depending on a presence of the further supply signal, causing said first switch to provide the preamble signal or the supply signal as a component supply signal, or causing said second switch to provide the further supply signal as the component supply signal.