The 10D390K Varistor with 31V-77V working voltage, 500A surge current and RoHS compliant from Hongzhi is a through hole electronic component. It is a nonlinear resistor that is used to limit voltage transients by providing myriads of resistance values, depending on applied voltages. The device is used to protect against dangerous voltage spikes in power supply systems. Typical applications for the 10D390K Varistor include switching power supplies, electrical transmission and distribution systems, and other control systems. The component offers excellent surge response and fast dV/dt capability, along with exceptional effectiveness against over-voltage transients.