K250R030 is a radial leaded, P=5.1mm, manufactured by Kailong, Resettable Fuses ROHS. It has a 220V operating voltage range, 0.03A current rating, 3A breaking capacity, and 1W power rating. It also has a -40?~+85? operating temperature, 0.06A hold current rating, 40O reaction time, 10s time delay, and 135O current limiting protection. This electronic part is ideal for protection against over-current or short-circuit.