A connection configuration unit

A connection configuration unit comprising a fixed part and a mobile part, the fixed part comprising at least three fixed input terminals and at least three fixed output terminals, the mobile part being moveable with respect to the fixed part from a first connection position to a second connection position; The mobile part comprises at least three connection sets. Each connection set comprises respectively an input terminal, an output terminal and a electrical connection path between said input terminal and the said output terminal. Each of said at least three connection sets is configured to allow electrical connectivity at said first connection position between a first fixed input terminal and a first fixed output terminal and to allow electrical connectivity at said second connection position between a second fixed input terminal and a second fixed output terminal.