What it is on the line
The XS618B1MAL01C is an inductive proximity sensor from Square D Switches & Sensors, sold under the Telemecanique XS6-series naming carried on this listing. Catalog identity on the row reads Telemecanique XS618B1MAL01C Proximity Sensor, matching the order code one-for-one, so a buyer cross-checking the box label against the BOM line gets a clean match.
Sourcing posture
Lifecycle stage is current, so the part is still on the brand's active line and a replacement search is not the immediate concern — the question is fit and lead time, not EOL.