Hi all,

Just thought I would pass on an interesting find to the list.  I had an old
faulty RCD Breaker (GFI unit for all those in the U.S.) lying around, so I
decided to pull it apart in the interest of finding out how these things are
constructed and how they work.  On doing so I found a very useful component.

There is a current transformer inside these units, at least the ABB unit I
have.  The core of this CT is a coil-wound laminated steel toroid with a
plastic casing.  If you pull off the existing windings, I have found this to
be an ideal core for winding your own current transformer.  Seeing as CT's
are quite expensive, I thought I would pass this on for anyone that might
have an old one of these lying around.

Rgs
Ian.

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