What is wrong with the created element?
Open the element-file with Element-editor, delete the "garbage" and save the element again.
When you then use QET_ElementScaler with a factor of 97 you'll get something like the attached file with a perfect scale of 1mm = 2px!
BUT:
For such a relatively simple part, I wouldn't do the work with dwg to dxf to elmt with all the imponderables and the resulting huge files! You'll have to edit these parts with Element-Editor anyway!
When I look at the real part, there are a handful of rectangles and circles that can be put together quite quickly with the element editor. Then you are also flexible if, for example, you want to have the entire series from the manufacturer as front view in QET.
In my opinion, a few rectangles and circles are enough for circuit diagram symbols anyway (see manufacturer parts Wago or Weidmüller).
[EDIT]:
In my opinion dxf2elmt produces "better" elements:
https://github.com/antonioaja/dxf2elmt/releases
[EDIT 2]:
LibreCAD can handle the dwg from your first post and can export dxf that can be read by dxf2elmt.
https://github.com/LibreCAD/LibreCAD/releases
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