A three - phase toroidal current transducer comprises a cuboid detector body (12), having three cylindrical passages (14) each for receiving a single - phase cable of a three - phase load (not shown). Each of the three passages (14) has an embedded toroidal winding (not shown) which is used to detect a current in the load cable (also not shown). Signals representing the current in each of the three individual load cables are sent to a meter (not shown), which may be located remotely. The signals are transmitted along a multi-core signal cable (16), which has a standard connector (18) for a plug-in connection to the meter. One of the wires in the multi-core signal cable (16) is connected to a component in the transducer (10) that identifies the rating of the transducer, so that the meter can determine this automatically when the signal cable is plugged in.
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