The Siemens 3RK1901-1NR04 is an AS-Interface 4-fold M12 feeder that transitions an AS-i flat cable into four M12 sockets, carrying both the AS-i bus signal and auxiliary power (Uaux) to each port. It uses an insulation-piercing connection method — no stripping or special tools needed on the flat cable, which saves time when you're adding drops on an existing line. Each M12 socket follows a fixed pinout: pin 1 = AS-i +, pin 2 = Uaux -, pin 3 = AS-i -, pin 4 = Uaux +. The operating voltage range is 26.5 to 31.6 V per the AS-Interface specification, and each socket is rated up to 4 A continuous. That 4 A per port matters when you're feeding multiple sensors or actuators through one drop — keep the total draw under that per-socket limit. Rated IP67, so it handles washdown and wet environments — suitable for food-and-bev lines, car washes, or outdoor conveyor sections where you don't want a junction box. The housing mounts to a wall or standard DIN rail, and the delivery includes the mounting plate.
Temperature range is -25 to +85 °C for both operation and storage, which covers most industrial enclosures and outdoor cabinets in moderate climates. The insulation-piercing design means you run the flat cable through the housing and close the clamp — no need to break the cable or add a separate tap. That keeps the IP67 seal intact and avoids a potential leak point.