Siemens Ronis key-operated switch, lock number SB31Product Overview RONIS key operated switch, 22 mm, round, metal, shiny, lock number SB30, with 2 keys, 2 switch positions O I, latching, actuating angle 90, 10: 30h 13: 30h, key removal O+I, possible special locks: SB31, 421, 455. Part of the SIRIUS ACT series, this key operated switch provides secure switching control with RONIS lock technology and latching operation. The key can be removed from both switch positions, offering maximum flexibility for