Can an MLO I-Line interior be converted to a vertically mounted main breaker interior?

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Issue:
Convert an existing I line Main Lug Only to a Main Breaker that is vertically mounted

Product Line:
Panelboards

Environment:
I-Line, NEMA 1, Nema 3R

Resolution:
No. There is no way to take the bus assembly apart and change it for this purpose.
A back-fed main-breaker must be used provided the interior is the correct size to accept the required breaker.