This is a stackable case that fits the Marklin 72090 H0 distribution strip. Put the strip in the case and keep it in place with the small circular “lid”. Then connect all your connectors through the holes on the side and close the case with the lid.
You can stack multiple cases on top of each other but it's difficult to separate the lid from the bottom of the case again (the holes in the bottom of the case should probably be slightly bigger).
The model was created in Tinkercad.
The author marked this model as their own original creation.