Technical terms related to the position of a push button (actuator)
(1) Free Position (FP)
State in which a pressing object does not touch the push button
(2) Operating Position (OP)
Position where the movable contact flips

(3) Total Travel Position (TTP) - Travel Limit Position -
Position where the push button is pressed to the limit

(4) Releasing Position (RP)
Position where the movable contact returns from the Operating Position to the original position

Summary
Technical terms related to the position of the push button (actuator)

Technical terms related to the movement of the push button (actuator)
(1) Pre-Travel (PT) - Movement from the Free Position to the Operating Position -
Distance covered by the push button from the Free Position to the Operating Position

(2) Over-Travel (OT) - Movement from the Operating Position to the Total Travel Position -
Distance covered by the push button from the Operating Position to the Total Travel Position

(3) Total-Travel (TT) - Entire Movement -
Total of 1. Pre-Travel, and 2. Over-Travel

(4) Movement Differential (MD) - Differential between the Operating Position and the Release Position -
Movement Differential = Differential between the Operating Position and the Release Position

Summary
Technical terms related to the movement of the push button (actuator)

Technical terms related to the forces applied to a push button (actuator)
(1) Operating Force (OF) - Force required to operate an actuator -
Force applied to move an actuator (push button) from the Free Position to the Operating Position
(2) Total Travel Force (TF)- Force Required for the Entire Push Button Movement -Required force applied to move an actuator from the Operating Position to the Total Travel Position

(3) Release Force (RF)- Force Required to Move a Push Button from TTP to RP
Required force applied to move an actuator from the Total Travel Position to the Release Position

Summary
Technical terms related to the forces applied to a push button (actuator)
