In article ,
Fred wrote:

It is possible that there is sufficient current flowing due to a
mains filter to trip the RCD. I've never been keen on
suppressors between live and earth because of the resultant
reactive current whereas the neutral current will be minimal.

I've never understood why inline mains filters are
not two series chokes, a cap between L-N, and a
single cap from N to E.

--
Tony Williams.