Protective means for circuit interrupting devices

Claim 1

A CIRCUIT INTERRUPTING DEVICE COMPRISING FIRST AND SECOND CONTACT MEANS, MEANS FOR OPENING AND CLOSING SAID FIRST AND SECOND CONTACT MEANS, MEANS FOR CAUSING SAID FIRST CONTACT MEANS TO OPEN PRIOR TO THE OPENING OF SAID SECOND CONTACT MEANS, TRANSFORMER MEANS HAVING A PLURALITY OF WINDINGS, SAID SECOND CONTACT MEANS BEING CONNECTED IN SERIES CIRCUIT RELATION WITH ONE OF SAID PLURALITY OF WINDINGS, SAID SERIALLY CONNECTED SECOND CONTACT MEANS AND WINDING BEING CONNECTED IN PARALLEL CIRCUIT RELATION WITH SAID FIRST CONTACT MEANS, FIRST AND SECOND CONTROLLED RECTIFIERS EACH HAVING MAIN AND CONTROL ELECTRODES, MEANS CONNECTING THE MAIN ELECTRODES OF EACH OF SAID FIRST AND SECOND CONTROLLED RECTIFIERS IN SEPARATE PARALLEL CIRCUITS AROUND SAID SERIES CONNECTED SECOND CONTACT MEANS AND WINDING, SAID FIRST AND SECOND CONTROLLED RECTIFIERS BEING POLED IN OPPOSITE DIRECTIONS, MEANS CONNECTING ANOTHER OF SAID PLURALITY OF WINDINGS IN CIRCUIT RELATION WITH THE CONTROL ELECTRODE OF SAID FIRST CONTROLLED RECTIFIER, AND MEANS CONNECTING ANOTHER OF SAID PLURALITY OF WINDINGS IN CIRCUIT RELATION WITH THE CONTROL ELECTRODE OF SAID SECOND CONTROLLED RECTIFIER, SAID WINDINGS APPLYING SIGNALS OF OPPOSITELY POLARITY TO THE CONTROL ELECTRODES OF SAID FIRST AND SECOND CONTROLLED RECTIFIERS WHEN CURRENT HAVING A PREDETERMINED MAGNITUDE FLOWS THROUGH SAID SERIES CONNECTED SECOND CONTACT MEANS AND WINDING.