The 820453811 from Wurth Elektronik is a Disk Varistor. It has an AC voltage rating of 385 V (RMS), a DC voltage rating of 505 V, and a clamping voltage of 1050 V. This varistor has a peak pulse current of 800 A and a power dissipation of 0.1 W. It operates over a temperature range of -40°C to 105°C. This RoHS-compliant varistor is available in a through-hole package that measures 32.5 x 7.2 mm.