1812AFTC-492K-01 is a Fastron 12 VDC, 200 mA, 12 x 18 mm, Threaded Chassis Mount, Straight PC Pin, PTC Thermistor. It is designed to protect sensitive electronic equipment from over-heating caused by excessive current draw. The part has a resistance of 492K ohms at 25°C. It is UL and CUL recognized and RoHS compliant.