A special type of palm-head momentary pushbutton is a 3-position momentary switch that is at-rest in a third neutral position.
This position allows the palm head to be either pushed in for one set of contacts to be momentarily held open, or to be pulled out for the other set of contacts to be momentarily held open.
With the third neutral position, both sets of switching contacts are held closed:
Neither operating position (push nor pull) can open both sets of contacts.
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