10D82 1K:

10D, which is the diameter (φφ 10mm) of the zinc oxide varistor ceramic sheet, Dise. 82 1, representing the voltage-sensitive voltage of 820V (82 1 refers to the first power of 82* 10), and k represents the allowable error 10%.

Rheostat is a kind of voltage limiting protection device. Based on the nonlinear characteristics of the varistor, overvoltage occurs between the two electrodes of the varistor, and the varistor can clamp the voltage at a relatively fixed voltage value, thus realizing the protection of the later circuit. The main parameters of varistor are: varistor voltage, current capacity, junction capacitance, response time, etc.