A question about the current input / output. The marking out 1 -> 8 is sandwiched between two terminals.
If each of the right of the two terminals of the power input.
Can what be damaged in a reverse polarity.
Many thanks for the answer
It’s hard to understand what you are asking.
If you are asking about the power supply for the board polarity does not matter since the board can accept AC or DC.
As far as the output the VM201 uses dry contacts (relays) this is just a electronic switch (in simple terms)
You can get some more information in this link.
http://www.vellemanusa.com/downloads/EngineeringNote-enu.pdf