Try searching on google for Teltonika 2-Pin EU Mains Power Supply, there you will be able to find shops that still sell the old power pin design.
It should look something like this:
Hello,i have a similar question,
for RUT240 there are 1 output and 1 input but are all connected in the same 4 pin power supply socket.
How can i use the input and output without destroy the power supply socket provided?