This is zoom of the image below showing the gaps and seeimingly insufficient electrical contacts between bus bar and breaker spring clips. Siemens seems to treat it as normal. So let's compute instead.
An electrical engineer told me:
"Compute the area as you would any rectangle. Remember that there is still a gap for a short distance below the edge of the feeler gauge.
I've never investigated that. But it would seem the contact area would have to be no less than the cross sectional area of the maximum wire size for the breaker... and probably a little more because of the added resistance due to the pressure contact versus the continuous metal of a wire."
To compute it, must I use the table for 60c, or 75c or 90c in the following?
Does anyone know where I can get thin copper conductor sheet. The spring clip and bus bar of original Siemens breaker and Siemens original listed enclosure panel is not making full contact (only at bottom) and Siemens won't admit they are incompatible.
So if I can insert thin copper sheet cut to the bus bar size.. then it can make spring clip and bus bar establish full contact. The bus bar thickness is short by 0.5mm or 1mm.