The Siemens 3RG7211-6MC00 is a SIMATIC PXO620 K80 retro-reflective photoelectric sensor with an integrated polarization filter, rated for universal control voltage 20-230V AC/DC. It switches via a C-contact (antivalent) relay output, with a built-in timer adjustable from 0.1 to 10 seconds. The housing is 83x61x25 mm, sealed to IP67, with a 5-pole PG11 cable gland.
The 20-230V UC supply covers both AC and DC control circuits — common in mixed-voltage panels where a single sensor must work across a 24V DC PLC output and a 120V AC relay coil. The polarization filter rejects false reflections from shiny targets (bottles, cans, foil), so it's suited for packaging lines where standard retro-reflective sensors would chatter. The 0.1-10s timer on the output is useful for delaying a signal through a fast-moving object gap, but note it's a fixed range — no external potentiometer for fine adjustment.