Push button switch, normally closed, generic, four pins D Momentary Switch, single pole normally-open tactile switch https://www.ckswitches.com/media/1973/ksc7.pdf C&K Switches 1P1T SMD PTS125 Series 12mm Tact Switch with High Contact Reliability, Top-actuated Model, without Ground Terminal, with Boss SPST button switch with LCD screen E3 SAxxxx switch normally-open pushbutton.