The 3RK1901-1NR22 is an AS-Interface accessory — specifically an M12 branch that transitions the AS-i flat cable into an M12 connector with both AS-i power and auxiliary power (Uaux) carried through. It comes with a 2 m cable and an angled M12 socket, pre-wired for a clean drop from the trunk line. The IP67/68/69K rating means the body and the M12 connection survive washdown environments — food-and-bev lines, outdoor conveyor sections, anywhere you hose the gear down. The screw fixing lets you mount it to a bracket or panel, keeping the branch off the cable tray.
Rated for 4 A max load current on the contacts — that's the total through the M12 socket, so size your downstream sensors or actuators accordingly. The operating voltage range is 26.5 to 31.6 V, per the AS-Interface specification, which covers the standard AS-i bus voltage plus a little headroom. The pin assignment on the M12 socket is: 1 = AS-i +, 2 = Uaux -, 3 = AS-i -, 4 = Uaux +. If you're wiring a device that needs both AS-i power and a separate auxiliary supply, this branch handles both in one connector — no extra junction box needed. One note from the spec: the cable must not end in the feeder. That means this branch is a tap off the flat cable, not a termination point — the trunk line continues past this drop.