The rest position is the position of the operating device when no external mechanical force is applied. The operating position is the position of the operating device at which the snap-action mechanism trips and note the distinct drop of force once the operating and release positions are crossed. The total travel position is the position of the operating device when an extreme force has moved it to the effective end of the available travel. The release position is the position of the operating device at which the snap-action mechanism trips back to its original position.