Don't know either. Thought mine was a limit switch. It was wired to something, but appeared to do nothing.
The guts of mine were gone, so I replaced the switch with this switch from Amazon
https://www.amazon.com/gp/product/B0...?ie=UTF8&psc=1
Switch didn't fit very well, but I wired it up anyway and still nothing.
You and I seem to be on parallel paths. I was also in the process of replacing my step slides when I discovered the same switch.
BTW . . . how's that slide seal project coming?