How new are these circuit breakers, and have they been replaced recently (last 15 years?)
At least here in the US, it's been required to install arc fault circuit breakers for circuits in many room types in the house; and as of 2014, basically all residential circuits require an AFCI (everything that does not require a GFCI due to proximity to water.)
The thing about them, is they can nuisance trip when something that presents a large inductive load. A pin could do that two ways: Either the transformer itself, or a combination of the transformer and the EMI/RFI filter that was typically installed in the cabinet...between the two of them they present a pretty large inductive load.
Ooh, Wikipedia tells me these things have been around in Denmark for a while:
I don't know about the Netherlands but I'd assume a similar requirement exists there.
You could try bypassing the EMI/RFI filter in the cabinet, and seeing if that helps. If it does, we're on the right track.
BTW, these breakers do actually fail, you might just need one replaced. I know moving the machine is a pain, but can you try it on another circuit somewhere?