UNITROL 1020 [caption id="attachment_1964" align="aligncenter" width="600"] UNITROL 1020[/caption] The UNITROL 1020 is a voltage regulator in the UNITROL1000 series designed for small and medium-sized synchronous generators and industrial equipment. The UNITROL 1020 combines performance control with simply designed power circuits. The UNITROL 1020 is a powerful small indirect excitation system with built-in dual-channel support