The 10D390K with Varistors 31V 77V 500A Through Hole RoHS manufactured by SOCAY is a radial leaded, metal oxide varistor (MOV) specifically designed to protect electronic and electrical circuits from surges, spikes, and other overvoltage transients caused by lightning, AC power line disturbances, energy switching, and other sources. It is voltage dependent and non-linear, meaning that it has a resistance that increases with the applied voltage and it can also dissipate energy without damage to the device itself. The device can handle transient voltages up to 77V with a working voltage of 31V, and can handle up to 500A of current. It is RoHS compliant and comes in a through-hole package for easy mounting.