Push Button is a control switch having an actuator intended to be operated by force exerted by a part of the human body, usually the finger or palm of the hand, and having stored energy (spring) return. The Key Actuators can only be operated as long as a key remains inserted & An Emergency Stop is a push button with spring return, but which remains in the actuated position until a latch is released by a separate action.
Contact Element consists of parts, fixed and moveable, conducting and insulating, of a control switch necessary to close and open one single conducting path of a circuit.