The 781KD25 with Varistors 640V 780 (702~858) 1290V 15KA Through Hole RoHS manufactured by Yageo is a particular type of varistor (short for variable resistor). It is designed to protect DC and AC electrical circuits from excess voltage spikes and surges. This varistor features a peak pulse power of 15 Kilowatts (KW) at 1290 Volts (V), and a maximum leakage current of 30 mA. It has a working voltage range of 702~858V with a clamping voltage of 640V. It has a capacitance of 15,000pF (151K) and an operating temperature range of -40C to 120C. The varistor is RoHS complian, has an insulated package, and is suitable for through hole installation.