MOV-20D561KTR is a 20 mm metal oxide varistor designed to protect against overvoltage transients such as lightning, power contact, and power induction. This device features a nominal varistor voltage of 560 V (with a tolerance of ±10%), a maximum continuous voltage of 340 V r.m.s., and a maximum peak current rating of 6500 A at 8/20 µs pulse. The varistor exhibits a fast response time of 10–25 ns and high energy absorption capability, with a maximum energy rating of 220 J per surge and 220 J/s continuous energy dissipation. It is RoHS compliant, UL 1449 certified, and commonly used in power supplies, power systems, line voltage protection, telecom systems, and white goods/appliances where reliable surge protection is essential.