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Hi Klaus,

First, thank you for spending time. I'm not PCB expert and appreciate your opinions.

I couldnt login my account so use this way instead.

1-) The relay will not switch AC it will switch 12VDC.  So both the relay coil and the contacts will work with same voltage 12VDC. So I didn't get why you mentioned, do I still need galvanic isolation(?)

Or maybe you already meant that I shouldn't worry? Just to be sure Im asking if I get it correct.

2-) Relay part hole is connected GISO ground and the other three holes are big plate are signal ground. So even they are connected at a point, there will be no ground loop through copper plates I will use isolated plastic standoffs.

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(Print says GND but they are indeed GISO)

The reason I asked this question whether it makes sense to remove ground plane in this case. If you think PCB A which is current verison is fine then I wont remove the ground plane. Im sorry if I sound stupid, its just I dont have enough expertise.