The Yageo 781KD14 is a through-hole, RoHS-compliant varistor rated at 640 volts and 780–858 pico farads (pF). It has a 1290 volts maximum surge energy and 4.5 kilo amperes (kA) let-through rating. It is used to protect equipment from over-voltage, high currents, or transients. Typically, this type of part is used in automotive, power supply, telecommunications, and home electronics applications.