Metal knob with a mounting diameter of 16mm. This button has a red LED illuminated ring, which works on 12V via a separate circuit. In addition to the 2 LED connections, this button has 3 contact points, NO, Common and NC. The circuit remains switched on as long as the button is pressed, when the button is released, the circuit is also closed again (momentary). This button is suitable for a maximum current of 3A with a voltage of 250VAC.