Can a convertible Main Lug Only (MLO) QO load center be used on a 240Vac grounded B phase Delta system if the MLO is converted to a Main Breaker (MB)?

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Can a convertible, main lug, QO load center be used on a 240 Vac, grounded B phase delta system if the main lugs are converted to a main breaker?

Issue:
Product Design feature

Product Line:
QO load centers

Resolution:
No, if the main lug load center is converted to a main breaker load center, it cannot be used on the 240 Vac, grounded B phase delta system. The QOM1-VH and QOM2-VH main breakers are not UL Listed for use on this voltage system.