The 781KD20J with Varistors Through Hole RoHS manufactured by Yageo is a radial leaded, 250VAC, axial leaded bi-directional heavy surge protective varistor. It is non-linear voltage dependent devices that protect electronic circuits from lightning, electrostatic discharge (ESD) and switching surges. They are typically used in power supplies, ESD protection, signal line protection, telecommunications, lightning protection, automotive, and general purpose surge suppression. The 781KD20J features low clamping voltage, high surge capability, fast response time, and an operating temperature range of -40°C to +85°C. It is also RoHS compliant.