I have 2 differential switches (ELCB's) in my electrical system.
One is rated at 0.03 Amps; the other at 0.30 Amps.

When plugged into a 20 Amp fused circuit, protected by the 0.03 Amp switch,
my new 1600 Watt electric grass verticutter causes the switch to trip at the
slightest (physical) resistance.
When plugged into a circuit using the 0.30 Amp switch, after a short test, I
have had no problems.

This does not sound normal to me; should I be worried?
The fuse does not go, so does this mean there is a short to earth somewhere?

Robert