The document summarizes the functions, references, characteristics and accessories of ATyS 3 motorized changeover switches ranging from 125A to 1600A. Specifically: - ATyS 3 products are 3 and 4-pole switches that are remotely controlled and provide switching, source inversion or changeover of two low voltage power circuits under load. - The document provides tables listing the references, ratings and technical characteristics of the switches at various amperages. This includes information on load duty, operational currents, insulation voltages, short-circuit ratings, connection details and switching times. - Accessories like terminal shrouds, screens and modules that can be added are also summarized.