Siemens 3SU1102-0AB20-1BA0 — SIRIUS ACT 22 mm command and signalling device. Panel-mount pushbutton, indicator lamp or emergency-stop actuator in the 22 mm cutout family. SIRIUS 3SU1 red pushbutton flat 22mm, 1NC contact module. Commonly used as "stop" in non-emergency-stop circuits. Installed in low-voltage switchgear panels, main and sub-distribution boards, motor control centres and DIN-rail consumer units.