The Siemens SIRIUS 3SF1324-1SE21-1BA1 is a mechanical safety position switch with a tumbler mechanism and a separate actuator (3SE5000-0AV0, ordered separately). It integrates ASIsafe communication — channel 1 monitors the actuator (1 NC), channel 2 monitors the magnet (1 NC), with additional monitoring contacts (2 NC/1 NO for actuator, 2 NC/1 NO for magnet). The switch is spring-locked, meaning the guard stays locked until the magnet coil (24 V DC/AC) releases it.
Enclosure is IP66/IP67 — dust-tight and protected against powerful water jets (IP66) plus temporary immersion (IP67). That makes it suitable for washdown zones in food processing or outdoor conveyor lines. The plastic housing and M12 fixed connector (4-pole, ASI+ on pin 1, ASI- on pin 3) simplify wiring: just one AS-Interface cable carries both power and safety data. Mounting position is any orientation; screw fixing is standard. The actuator can approach from five directions, which gives flexibility in gate alignment. Mechanical service life is 1 000 000 cycles typical — a solid figure for a safety switch in moderate-duty guarding applications.