The Siemens 3RG4012-0KB00 is an inductive proximity switch sensor in a cylindrical metal housing with a front sensing face. It detects ferrous targets at 2 mm flush-mounted — meaning the sensor face can be level with the mounting surface, no dead zone around the head. This matters when you're fitting into a tight bore or a machined pocket where standoff isn't an option. Rated IP67, the housing and cable entry withstand washdown and temporary immersion — suitable for machine tools, packaging lines, or conveyor transfer stations where coolant or washdown hits the sensor body. The operating voltage range is 20…265 V AC/DC.
Rated operational current is 0.2 A — this is a signal-level sensor, not a power-switching device. It drives a PLC input, a relay coil, or a contactor coil with a suitable interface. Do not expect it to switch a motor load directly. Switching frequency: 1200 Hz on DC, 25 Hz on AC. If your target passes at line speed, the DC mode handles fast counting (up to 1200 events per second). On AC supply, the sensor is limited to 25 Hz — fine for position detection on a slow-moving conveyor, not for a high-speed pick-and-place. Output is normally open (NO) with two wires. Two-wire DC sensors have an off-state leakage current. Connection is via an M12 connector with a 2 m PUR cable pigtail. Ambient temperature range is -25…85°C. The sensor can live inside a warm cabinet or near a hot process line, but the cable jacket and connector seal are the limiting factors at the high end — keep the connector body out of direct radiant heat.