The 10D471K with Varistors 385V 775V 2.5KA Through Hole RoHS is a varistor manufactured by Ruilongyuan. It is an electronic component mainly used to protect against voltage transients, and it can be mounted and soldered directly onto PCB boards. This varistor has a variable circuit voltage range between 385V and 775V and also has an operating temperature range from -30°C to 85°C. It is also RoHS compliant, meaning that it contains no hazardous materials.