ISHIELDThe COVISHIELD 05D180K Varistors 14V 18 (14.4-21.6) 40V 100A Through Hole RoHS is a varistor device constructionally comprised of metal oxide on a ceramic core. This electrical component is designed to limit and provide protection against voltage surge overcurrent, as well as to protect against overvoltage caused by lightning and other environmental factors. The specific 05D180K Varistors 14V 18 (14.4-21.6) 40V 100A Through Hole RoHS model is able to withstand voltages up to 40V, and up to 100A of current at any time. It has a voltage range of between 14.4V and 21.6V. Its construction is through hole, with RoHS compliances.