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I would like to drive a relay so that it is activated when the current running through a wire exceeds a certain threshold. The voltage is 240V AC and the current will be about 1A. Can anyone recommend an off the shelf kit or module for this purpose? Many thanks, Paul. PS - I can either break into the wire to install a resistor or I can use a ring round it "clamp on" style. It will be a permanent installation.
And got the following answer:
You might be able to get power strips which do that. If it were me, I would make one out of the transformer from an old RCD or the like. The output coil would be rectified to DC and a comparator trigger to close a relay or contactor. It would be made into a portable device, with a master and controlled receptacle, and a cord which plugs into a wall receptacle.