Wireless 230V receiver-transmitter with control signal supply - I am looking for a device

Welcome,

I am looking for such a device:

Receiver - Transmitter. When 230V appears on the transmitter, this transmitter gives a signal wirelessly to the receiver - the receiver starts the 230V device. When the voltage to the transmitter is cut, the device connected to the receiver is also switched off.

Unfortunately, I cannot connect a separate power supply to the transmitter, so the control signal must also be a power supply.

Is there such a thing?

The transmitter must have a separate power supply. No power, no transmission.....

It is not necessarily as Telbod writes. After all, you can support yourself with a battery power supply or using the fact that the transmitter is only supposed to be active when the "control signal is there", i.e. you can possibly also use it to power the transmitter. Here you can think of some miniature power supply for LEDs, for example, and adapt it to your specific solution.

Perhaps something like this would be suitable:

http://www.auraton.pl/pl/inf/regulatory_tempe...atory_bezprzewodowe/akcesoria/auraton_tx1_rth

What concerns me in this case is only one additional function of this kit: "In case of a possible lack of communication with the controller, the receiver executes the previously stored program". I don't know if it can be blocked.

Unfortunately, but this receiver stores events from the last 24 hours in a loop and, in the absence of control signals, it will recreate those from the last 24 hours.
You didn't state whether a delay in disconnecting the load in case of control signal loss is allowed and what time it is, e.g. 1 or 10 seconds.
It would be simpler to use 2 atmelk with radio modules. One transmits pulses when power is applied, the other receives them and switches on the load. If it does not receive a signal for e.g. 1 second, it disconnects the load.
Alternatively, the transmitter has a mains power failure detector and suitably large capacitors in the power supply allowing it to send a control signal failure data frame. Then the shutdown delay can be much lower in the order of 20-50ms.