A what amperage do MCC feeder breakers get bolted on and not plugged on to the vertical bussing?

Issue:
At what amperage do MCC feeder breakers get bolted on and not plugged on to the vertical bussing?

Product Line:
Model 6 MCC

Environment:
Application

Cause:
Section Layout

Resolution:
After 400A, the Feeder breakers will be bolt connections , ie 600A , 800A

Released for: Schneider Electric Canada