The Siemens 3RG7241-3CH44-0HA0 is a SIMATIC PXO520 C40 retro-reflective photoelectric sensor with a built-in polarization filter. It runs on DC 10-30 V, delivers a PNP output rated at 200 mA, and has a 6 m sensing range. The housing is 40x40x55 mm, sealed to IP67, and terminates in a 4-pole M12 connector. Output logic is programmable between light-on and dark-on, with a factory default of light-on setup.
The 6 m range on a retro-reflective sensor with polarization filter means it handles shiny targets that would fool a standard retro — the filter rejects mirror-like reflections from the target itself, so it only sees the reflector. The 10-30 V DC supply is standard for industrial 24 V panels; the 200 mA PNP output drives a PLC input or a small relay directly. IP67 lets it live on a machine frame or conveyor section where washdown happens. The M12 connector is a 4-pole, so you get power, output, and a programming line — the fourth pin is typically used for the light/dark select wire.