Siemens 3RG4013-3AA00 Proximity Switch, 5mm, PNP, NC, 10-65V

The 3RG4013-3AA00: The 5 mm sensing distance is the rated operating distance for a standard target (mild steel, 1 mm thick, square of side equal to the sensing face). The PNP normally-closed output means the output transistor is on when no target is present and switches off when the target enters the sensing field — useful for fail-safe monitoring where a loss of sensor should indicate an alarm state. The 10–65 VDC supply range covers common 12 V, 24 V, and 48 V control voltages, making it flexible for both machine-level and panel-level wiring.