The Siemens SIRIUS 3SF1124-1QV10-1BA2 is a mechanical safety switch in a metal block housing, designed for guard-door and position interlocking on machinery where a positive-opening contact is required per IEC 60947-5-1. The integrated LED (24 V supply) gives a quick visual on the AS-Interface bus status — pin 1 is ASI+, pin 3 is ASI-, pins 2 and 4 are unused. The ID1 code is set to F (hex, variable 0...F), which means the slave address on the AS-Interface network is configured via the code switch on the unit.
The IP66/IP67 rating means the metal enclosure with cathodic dip coating handles washdown environments — suitable for food processing, packaging lines, or outdoor conveyor transfer points where high-pressure spray is routine. The positive-opening function (guaranteed by the slow-action contacts) ensures the NC safety contacts physically break even if welded, which is the core requirement for safety circuits up to SIL 3 / PL e. With 1 safety-related NC contact and 2 additional NC auxiliary contacts (zero NO), this switch is wired as a series-connected safety chain — you get three NC paths for dual-channel monitoring plus a feedback loop. The mechanical service life of 1,000,000 cycles is typical for this class; the real wear item is the actuator alignment, not the switch body.
Screw fixing, any mounting position. The block housing is 56 mm wide and 124 mm long — roughly the footprint of a small contactor, so it fits on a standard sub-panel or machine frame without a DIN rail. The M12 plug (4-pole) carries the AS-Interface bus power and data; no separate control cable needed. Compatible actuators include the 3SE5000 family: standard, vertical-fixing, transverse-fixing, left/right radius, and universal. Choose the actuator that matches your guard-door hinge side and approach direction.