The Siemens 3RG7212-6MC42 is a SIMATIC PXO630 K80 thru-beam sensor receiver. It works with a separate emitter to create a photoelectric beam across distances up to 50 m. The receiver outputs a relay C-contact (antivalent) and includes an adjustable timer from 0.1 to 10 s. Power supply is universal AC/DC 20-230 V, and the housing is IP67-rated with a PG11 cable gland.
The housing measures 83x61x25 mm, sized for a standard sensor footprint. The PG11 gland accepts cable diameters typical for 5-pole connections. The C-contact antivalent relay gives both normally-open and normally-closed outputs on the same switching element, which simplifies wiring to a PLC input module or a contactor coil. The built-in timer (0.1-10 s) delays the output after the beam is interrupted or restored, so you can filter out brief blockages in a conveyor or crusher feed.