The CNR-05D391K with Varistors ThroughHole RoHS manufactured by CNR is an electronic component designed for overvoltage and overcurrent protection. It is a resistive-type, non-linear device which rearranges itself in resistance to limit voltage and current spikes to a more controllable level. It is typically used in AC/DC power supplies and high-voltage circuits, and is RoHS compliant. It has a working voltage range of 261-406V, and a capacitance range of 0.8-440V. It is encased in a through-hole package and has a maximum power rating of 5W.