The 181KK07 from Yageo is a Metal Oxide Varistor that is designed to protect sensitive electronic equipment from voltage transients induced by lightning and other transient voltage events. This varistor requires an AC voltage of 115 V, DC voltage of 150 V, and has a rated power of 0.25 W. It has a clamping voltage of up to 300 V. This varistor provides a fast response when a transient over-voltage develops in the circuit and can absorb large transient energy with no follow-on current. It has high voltage and large withstanding surge current capacity and is usually used in AC input of different power supplies. This RoHS-compliant MOV is available as a through-hole package that measures 9 x 32 mm and is ideal for surge protection in consumer electronics, industrial electronics, electronic home appliances, gas and petroleum appliances, relay, and electromagnetic valve surge absorption, transistor, IC, diode, thyristor, and triac protection applications.