(under subclass 99) Subject matter wherein the device is specifically adapted to operate in response to the currents in the respective phases of a multiphase or polyphase system, whereby one polyphase network is connected to another similar polyphase network through the device or wherein the device consists of a plurality of magnetic windings and having supplied to each winding an operating current at a phase angle different from that applied to each of the others.
SEE OR SEARCH THIS CLASS, SUBCLASS:
8+, for polyphase automatic circuit interrupter devices.
SEE OR SEARCH CLASS
200, Electricity: Circuit Makers and Breakers, appropriate subclasses for nonmagnetically operated switches of the multiphase type.
307, Electrical Transmission or Interconnection Systems,
13+, for polyphase systems in general that may include phase switches. An subclasses 112+ for plural phase switches especially indented subclass 127 for phase sequence responsive type. 361, Electricity: Electrical Systems and Devices,
1+, for safety and protection systems which may utilize plural phase type devices.
