The Siemens 3RG40233AF01 is a proximity detection switch with a PNP output, rated for 15-34VDC supply. It sits in the Limit and Proximity Switches category, subcategory Proximity Detection Switches.
Lifecycle is marked EOL hot. If you need to freeze a BOM or qualify a substitute, the RFQ process should include a request for the manufacturer's last-time-buy notice or a recommended replacement.