The Siemens 3RG7212-6MC18 is a SIMATIC PXO630 K80 thru-beam sensor receiver. It works with a separate emitter to detect objects across a gap up to 50 meters, outputting a relay signal via a changeover contact. It runs on universal control voltage 20-230V UC, so it fits both AC and DC control circuits without swapping modules. Housed in a 83x61x25 mm package with a PG11 cable gland and IP67 rating, it's built for wet, dusty environments on a conveyor line or a rotating-equipment route. The built-in timer (0.1-10 seconds) lets you stretch or delay the output pulse — handy for clearing a jam without a separate delay relay.
The 50-meter range is the maximum clear-air spec — real-world reach drops with dust, steam, or misalignment, so plan your mounting accordingly. The UC 20-230V supply means you can wire it into 24V DC or 120V AC control panels without a separate power supply, but watch the relay contact rating if you're switching a motor starter coil directly. The IP67 enclosure keeps out dust and temporary submersion, but the PG11 cable entry needs a proper seal — don't leave the gland loose out here in the grease. The 5-pole connection includes the changeover contact (C-contact, antivalent) plus supply, so you get both NO and NC signals from one sensor head.