3021103 is a part of Ritel, a modular electronics and instrumentation system used in industrial, commercial and institutional applications. The 3021103 is a module that provides AC and DC power to the Ritel system. It is rated for both 120V and 240V use, and provides 16A and 30A connections. The module is used to provide the necessary power to the other Ritel modules, including analog and digital input/output modules, digital signal processing modules, and other specialty modules.