Siemens 3SF1234-1LC05-1BA1 is a 31 mm-wide SIRIUS position switch (Basisschalter) in the ASiSafe/SIRIUS lineup, featuring an M12 4‑pole device plug and two snap‑action normally closed (NC) contacts suitable for 24 V DC circuits. Designed for machine guarding, it serves as a safety‑position sensor in safety circuits and guard interlocks, enabling safe stop logic when a guard is opened. The unit carries IP65 protection and is documented in Siemens’ IC10 catalog under Position and safety switches as a single‑unit module.
