The Telemecanique XS8C2A4DAM12 is a block/rectangular inductive proximity sensor from Square D Switches & Sensors, wired as a DC normally-open 2-wire device. It detects the presence of ferrous metal targets without physical contact, making it a standard pick for position sensing on conveyor lines, machine stops, and automated gateways where a rectangular housing fits the mounting footprint better than a barrel style.
The DC NO 2-wire output means it sinks current when a target enters the sensing field — no separate power wire needed, just two connections for supply and load. That simplifies wiring in a crowded panel but limits the load to DC only; you cannot run it on AC control voltage. The block/rectangular body gives you a stable mounting base with two through-holes for M4 or #8 screws, which is handy when vibration is a concern on a machine frame.