Slightly OT, but might be of interest to the group.
We use a lot of MCB's in our chargers, especially the mobile railway chargers, and recent experiences with various manufacturers seems to suggest that although they all may come with the same nominal rating, some makes seem to perform better than others.
While testing some 29V 200A 3-phase chargers last week, we had 10A 'D' rated MCB's from ABB which would trip on turn-on, but Hager manufactured MCB's didn't show any problem.
Eaton MCB's seem fine also. These are the three main makes that we use.
We have seen this before on some 2-pole units as well, where ABB would not support a transformer load while the others would.
We only use 'D' ratings because of the large inductive load of the mains transformer.
Has anyone else noticed anything similar, with variations between makes?
Peter
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