The VDRUS14X550xyE from Vishay is a Metal Oxide Varistor that has been designed for over-voltage and transient voltage protection. It has an AC voltage rating of 550 V (RMS), a DC voltage rating of 745 V, and has clamping voltage of 1500 V. This varistor consists of a disc of low-β ceramic material with two solid copper leads or copper-clad steel wire. It provides electrical, mechanical, and climatic protection with UL 94 V-0-approved silicone lacquer material that is coated on wires. This RoHS-compliant varistor exhibits a very high current surge/size ratio capability of up to 13 kA. It is available in a through-hole package that measures 7.9 x 4.5 mm.