The 301KD07 Varistor manufactured by Yageo is a through hole RoHS compliant part that has a voltage rating of 250V and a 300 (270~330) 500V 1.2KA. This part is an electronic component that acts as a short circuit protection device in order to protect a circuit from voltage transients. It helps to prevent damage caused by sudden increases in voltage in the circuit. It is typically used in a wide range of electronics, such as home appliances, industrial equipment, and medical instruments.