This device is a resettable fuse, manufactured by JDT, with ROHS certification. It is rated with a voltage of 10-30V, 3 amps, 0.5 watts, 0.9 ohms, 1 second time delay and a 6 ohms 0603 RoHS package. It has a current rating of 15V 0.1A 40A. It can be used to protect components from short-circuits and over-current conditions, as well as providing a reset function in case of an over-current event.