I was finally able to test this on a pro lab with full 20A throughput. The small Fan started moving at ca 10A, but was still silent at 20A. We shorted and let the module take a bit of beating with no effect – it continued to behave. This turns out to be a very good programmable Lab PSU module. Well done.
A minor comment is that the module lack a calibration option. Both Voltage and Current are close, but we noticed a 0.3V difference to calibrated instruments. This could easily have been calibrated in software.