ShelbyvilleARCO Electric Products Online - Homepage Roto Phase Quality The Roto-Phase name stands for more than Quality, Performance, and Dependability...it stands for Service and Technical support from a long list of long-time customers to a first-time installer or first-time buyer. The converter industry has changed dramatically; requiring skilled knowledge of three-phase equipment and its application for the best service and technical support available. The ARCO staff of applications engineers will provide the best service and technical support available in the converter industry. More Deta