It fits perfectly in Busch-Jaeger, Gira and other manufacturers.
Not suitable as child protection because of the handle.
The guide pins are printed separately to avoid supports. They should be secured with a drop of superglue. But you can also leave them out, they should only protect the contacts a little better.
I printed the part with Fillamentum ASA Extrafill, but other filaments should not be a problem. The color of Material4Print ASA Nature will match very well with Busch-Jaeger Cream White.

If the pins don't fit well, the flow rate should be varied.