Proximity Switch LJ18A3-15-Z-B/Y

The Proximity Switch LJ18A3-15-Z-B/Y is an M18 inductive proximity sensor that detects metal objects without touching them. It has a 3-wire DC design with a PNP normally open (NO) output and runs on 6–36 VDC, so it connects directly to PLC inputs and industrial controllers. The threaded body mounts easily on brackets and machine frames, and an LED shows when a target is detected.Proximity Switch LJ18A3 Specifications Sensor type: Inductive (detects metal) Body: M18 threaded cylinder with mounting nuts Wiring: 3-wire DC: brown +V, blue 0 V, black signal Output: PNP, normally open (NO) Supply voltage: 6–36 VDC Targets: Iron and steel; other metals at a shorter distance Indicator: LED Proximity Switch LJ18A3 Applications Position and end-of-travel detection on machines Counting metal parts on conveyors Homing and limit sensing on CNC machines Speed detection on gears, bolts and shafts PLC input signals in industrial automation What's in the Box1 × LJ18A3 inductive proximity switch with mounting nutsTip: A PNP output switches the positive supply onto the signal wire, which suits PLC inputs wired for PNP sensors. If you power the sensor at 12–24 V and read it with an Arduino or ESP32, use a voltage divider or an optocoupler to protect the input pin.