Patent ID: 7889466

Claim:
A bi-directional switching system for a fault circuit interrupter which is connectable to a power line, the system comprising: a) a plurality of electrical conductors having a line side and a load side; b) at least one circuit interrupter disposed along said plurality conductors and configured to selectively electrically isolate said line side from said load side; c) a plurality of transformers comprising at least two differential transformers and at least one grounded/neutral transformer, wherein at least one of said at least two differential transformers is positioned on a line side, and at least one differential transformer is positioned on a load side; d) at least two electrical connection interfaces comprising at least one first interface and at least one second interface disposed to connect to at least one power line, wherein said first connection interface is positioned on one side of said circuit interrupter and said second connection interface is positioned on an opposite side of said circuit interrupter; wherein said plurality of electrical conductors extending from said at least two electrical connection interfaces, and said plurality of transformers, said plurality of electrical conductors including at least one line conductor, at least one load conductor and at least one transformer conductor, which is configured to electrically connect to at least one of said plurality of transformers; d) at least one fault circuit component; and e) a plurality of switches coupled to said at least one line conductor, said at least one load conductor, and said at least one transformer conductor, said plurality of switches disposed to switch electrical connections between said at least one first interface and said at least one second interface to selectively connect said at least one fault circuit component to either said at least one first interface or to said at least one second interface via at least one of said plurality of electrical conductors.