The Siemens 3RG7652-3AB00 is a SIMATIC PXO230 M18S thru-beam sensor receiver — the receiving half of a rectangular-optics pair, sized M18×72 mm. It runs on 10-30 VDC, switches PNP light-on at up to 150 mA, and reaches 6 m through the beam. The M12 4-pole connector and IP67 rating let it live on a machine frame or conveyor rail without a secondary enclosure.
The 6 m sensing range is the through-beam maximum under clean conditions. PNP light-on output means the signal goes high when the receiver sees the emitter beam. The 150 mA load capacity covers a direct-connected relay or small solenoid.