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Can any QMB breaker switches be backfed as a main breaker?

Issue:
Can any QMB breaker switches be backfed as a main breaker?

Product Line:
QMB Panelboards

Environment:
Clarifying if the breaker QMB devices can be backfed as a Main 

Cause:
Converting a Main lug QMB panel to Main breaker , or Main fusible switch

Resolution:
No, the Breaker switches , per the wiring diagram label , have Line and Load markings, this eliminates the possibility of using it as a back fed Main. QMB Fusible switches have never been rated for backfeeding.
 

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