Can a key interlock be used on an I-line panel with a vertically mounted main breaker?

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Issue:
Do we have an interlock for I-line vertically mounted main breakers and a branch breaker?

Product line:
Panelboards

Environment:
Vertically mounted main breakers in I-line panelboards

Resolution:
No. All I-Line key interlocked breakers must be located in the branch portion of the I-line panel between a backfed main and a branch breaker. A special mounting bracket is used to mount the interlock. There isn`t a location for this bracket with a vertically mounted main breaker application.