Siemens RONIS Key-operated switch, round, 2 pos O-I, 22mmProduct Overview The Siemens 3SU1050 4BF01 0AA0 is a key operated switch head from the SIRIUS ACT 3SU10 series. Designed for a 22 mm panel cut out and featuring a metal, shiny finish, it offers two switch positions (O I), latching actuation with a 90 rotation, and is supplied with two keys. Lock number SB30 is standard with optional special locks available. Key Features Key operated switch head (RONIS type) for 22 mm panel mounting Metal, shiny