The 10D220 Varistor is an 18V 43V 500A Through Hole RoHS Varistor manufactured by Hongzhi. It is an electronic component used in voltage transients, overvoltages, and electrical surges protections for AC and DC circuits. This Varistor is the perfect solution for In-rush current protection, voltage spikes, noise protection, and over-current protection. It has a maximum surge voltage rating of +18V to -43V and a clamping current of 500A. It is a RoHS compliant device which ensures that it does not contain any hazardous substances that could pose a threat to the environment or to human health.