The Siemens 3RG7202-3BG00-0XB4 is a SIMATIC PXO630 K80 ATEX thru-beam sensor transmitter — the light-emitting half of a paired detection set, sized 83x61x25 mm with a DC 10-36V supply and M12 4-pole connector, IP67-rated, listed for Ex Zone 2/22.
Runs on 10-36 VDC, so it fits standard 24 VDC control panels without a dedicated supply. The M12 4-pole connector mates with common sensor cables; pinout follows the usual thru-beam transmitter convention — power and signal on separate pairs. IP67 lets it live on the machine frame or in wet washdown zones, and the ATEX marking for Zone 2/22 (gas and dust) means it's certified for potentially explosive atmospheres — not just a general-purpose photoelectric.