3SU18020AB002AB1 3SU1802-0AB00-2AB1 Siemens

Enclosure for command devices, 22 mm, round, Enclosure material plastic, enclosure top part gray, 2 control points plastic, B=pushbutton green, label: I, 1 NO, screw terminal, A=pushbutton red, label: O, 1 NC, screw terminal, floor mounting, 1xM20 each on top and bottom