I thought that the KA rating had something to do with the time curve, "the point a which it will trip".
The higher the KA rating the faster it will trip?
Regarding the breakers (using 3 2-pole instead of 2 3-pole) the breakers don't see what the other phases are doing?
Re. the 37 Amps. Is it possible one of the elements is bad?
Do you know the configuration of how they are connected?
