The Siemens 3RG4013-3GB00 is an M18 inductive proximity switch with a 5 mm rated operating distance and a normally open switching output. It carries a 0.2 A rated operational current and operates across a -25 to 85 °C ambient range. The effective sensing window sits between 4.5 and 5.5 mm, with repeat accuracy of 0.15 mm and hysteresis of 0.04 to 1.15 mm.
The 5 mm rated operating distance (4.05 mm assured) means this sensor detects ferrous targets passing within that gap — typical for position sensing on conveyor rollers, actuator end stops, or cam profiles in a machine cell. The M18 threaded barrel mounts through a standard 18 mm hole or bracket; the 55 mm body length fits compact spaces. The 0.2 A switching current handles direct PLC inputs or small relay coils, but not motor contactors directly.