On Sun, 17 Mar 2019 14:18:18 +0000 (GMT), "Dave Plowman (News)"
wrote:


What sort of fault inside the charger could have caused the RCD to trip?

Anything on the AC side which caused a short. RCD's have a habit of
tripping on L to N faults which involve high currents. Most commonly
seen when GU10 bulbs fail the RCD will often trip even though there is
no leakage to earth.