The Yageo BK16-400-SZ is a through-hole resettable polymeric positive temperature coefficient (PTC) fuse. This fuse is designed for over-current protection in a variety of electronic applications. It features a high-temperature resistant construction and a reset time of just ten milliseconds (10ms). Its resistance is modified by an internal heater, which increases the resistance when the current pass through exceeds the anticipated level. And when the temperature reaches a specified level, it will reset the circuit and protect the device. It is RoHS (Restriction of Hazardous Substances) certified and meets ISO-4013 standards. It has a maximum current rating of 16A and a voltage rating of 400VAC.