That thing with a screw in it is a saddle clamp used to grasp the electrical wire unto the bussbar.
Theres probably contacts somewhere else in the unit.
After edit
Im now thinking that this has no contacts in it at all. That its just a single unit that sits beside a row of these in a machine or something any the ínput wires go into the bottom of it & the machine part wires go into the top of it.
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