Automatic circuit restoration device for polyphase feed lines

摘要

An automatic circuit restoration device for polyphase lines, comprising a set of normally open circuit breakers connected in series to respective feed lines and controlled in unison by one coil, and an auxiliary movable contact controlled by means responsive to the presence of voltage on one or more of the feed lines so that said movable contact is opened and said circuit breakers are closed through said coil when one of said feed lines is deenergized.