Thx DC.
No idea about the curve, but the pump is just a 450W Hitachi Inverter House pump.
Our first thought was that Ants got in but Sparky checked, on top of the house etc etc and no ants found in the wiring or the pumps.
My Guess is that the Haco was faulty, as well, because after changing it for the Siemens no issues at all. *Better Quality maybe also???*
We have the same Haco in our own house as incoming and no issues *knock on wood* just yet.
I have ordered a 63A ABB just in case for our own House