The 3RG7641-0HD00 is a SIMATIC PXO220 M18S retro reflective sensor, polarized with straight optics, in an M18x52 threaded barrel. It runs on 10-30V DC, outputs NPN light-on at 150mA, and terminates in a 2-meter PUR cable with 4x0.34mm² conductors. IP67 rated, with surplus light detection capability.
The 3-meter sensing range is for a standard reflector (not included). Polarized optics reject false triggers from shiny targets. NPN light-on means the output sinks low when light returns to the receiver — common for PLC inputs that expect a sinking signal. The 150mA continuous load covers direct relay or small solenoid drive without an interposing module. PUR cable resists oil and flexing in machine-mount applications.