ARThe 07D221K with Varistors 180V 220 (198~242) 380V 1.2KA Through Hole RoHS manufactured by COVAR is a varistor, also known as a transient voltage suppressor (TVS). It is designed to protect circuits from voltage spikes. It can handle current up to 1.2 KA, and voltage up to 380 V. It is rated between 180 V and 220 V, but its working range is between 198V and 242V. It is manufactured using THROUGH HOLE technology, and is RoHS certified.