The Siemens 3RK1405-0BQ20-0AA3 is an ASIsafe compact module in the K45F form factor — 2 safe digital inputs for mechanical switching contacts, paired with 2 standard solid-state outputs. It sits on a DIN rail or wall mount (mounting plate 3RK1901-2EA00 or 3RK1901-2DA00 ordered separately) and connects via four M12 sockets. The module draws its 24 V DC output supply from the AS-Interface bus, so no separate auxiliary power is needed for the outputs.
IP67 means the module and its M12 connectors tolerate washdown and dust — suitable for food-and-bev lines, packaging floors, or outdoor conveyor sections where hose-down cleaning is routine. The 34 mm depth and 45 mm width fit a standard DIN-rail footprint; the 80 mm height clears most enclosure lids. Each safe input draws a minimum of 5 mA at signal <1>, which is typical for mechanical contact sensors — no additional pull-up resistor needed. The solid-state outputs are rated 0.15 A each, short-circuit proof, so they can drive small indicators, solenoid pilot valves, or PLC input cards directly. The AS-Interface bus supplies 26.5 to 31.5 V DC to the module, and the module draws up to 250 mA from the bus total.