The 7D180 with Varistors 14V Through Hole RoHS is a type of varistor manufactured by the company Hongzhi. It is an electronic component used primarily to protect sensitive electronic components from overvoltage or surge currents. It works by clamping the voltage to a maximum level, dissipating excess current through its own resistance. The 7D180 can withstand voltages up to 14 volts, is encased in a through-hole case for easy installation, and meets the standards of RoHS (Restriction of Hazardous Substances). The 7D180 is widely used in power supplies, LED lights, and consumer or industrial equipment.