what is this GM limit switch?

Florida life

New member
I found this limit switch in a bin that had a lot of irrigation stuff in it when i bought my house. Maybe it was for the well pump? I have no idea what a limit switch is and what would it be used for at a house?

It is a GM PLUS 2 Limit Switch CR215GFJ and on the top it says CR215GH59

It has sort of spring loaded turn knob on it that returns to center when you let go.

Any ideas?
It is not a GM switch but raher a GE switch. General Electric. Sorry.
 
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