What can I add to an older ZW transformer to safely operate a Lioncheif plus or similar newer locomotive to prevent damage to the circuit board?
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Following.
You can certainly add a fastblow fuse or breaker in-line which will protect the transformer. To help protect the engines you can also add a TVS diode at each power connection to your track.
For more protection (and cost), go with a PCX-AC board, available from different suppliers, including Charles Ro.
There are many threads on this subject on the Forum which you can search for information, as well.
