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That's what I initially thought until I found the sub-enclosure with the "RCD" board inside (posted additional pics a few minutes ago) It has an 8pin surface mount IC. Very hard to read it but will get a more powerful magnifying glass and have a look.

Yes that is the phase (white sleeved conductor) and neutral (lacquered copper conductor) squeezed into a current transformer. <br>The white sleeving on the phase looks like it might be thermally robust.

Shows several capacitors, resisters and a single 8pin IC yet to be identified.

Was connected to the test button <br>

Or simply murdered one in cold electrons - all in the name of science of course 8) http://www.diynot.com/network/sparkticus/albums/9892