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What's the difference between a " Spring return " contact and a " Stay-put " contact?

A " Spring return " contact is a contact that returns to the zero position instantly upon hand release ( Via a spring ).  If the contact is NO, it remains closed as long as the user has his hand grib on it in a certain direction and vice versa ( for the NC contacts ).
As for the " Stay-put " contact, this contact remains in the position last selected by the operator. It returns to the " 0 " position only if the user returns it manually.
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