MOV-10D391KTR is a 10 mm radial leaded metal oxide varistor designed to protect against overvoltage transients such as lightning, power contact, and power induction. The device features a nominal varistor voltage of 390 V with a maximum continuous voltage rating of 250 V rms and 320 V dc, offering high current handling and fast response times to protect against transient faults up to rated limits. With a maximum peak current rating of 60 A (8/20 µs), maximum energy absorption of 70 J, and a response time of 10–25 ns, this varistor provides robust surge protection. The device is RoHS compliant, meets UL 1449 and ITU-T K.20, K.21, K.45 standards, and is commonly used in power supplies, power systems, line voltage applications, telecom systems, and white goods/appliances.