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Can any QMB switch or QMB breaker in a switch housing be backfed as a main or backfed for any reason?

Can the QMB breaker switches or QMB switches be backfed?

Product Line:
QMB Panelboards

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

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

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 or backfed for any reason. QMB Fusible switches have never been rated for backfeeding.

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