A providing device of the presence and sequence of phases of the three-phase current. (Machine-translation by Google Translate, not legally binding)

摘要

A device for checking the presence and sequence of phases of the three-phase current, characterized in that it comprises a set of three main electrical branches, basically identical in constitution, each of which comprises an input resistor adjacent to the terminal of the three-phase circuit, extending in two other subsidiary branches, one of which involves an intermediate resistance and a neon lamp, and the second an ohmic resistance, the connection of the ends of said subsidiary branches being made in a single point and establishing a complementary circuit that interrelates two of the main branches in zones located between the input resistors and their respective branches, comprising a communication conductor between said main branches, in which a switch and an electric capacitor are interposed. (Machine-translation by Google Translate, not legally binding)