On panelboard interiors NF430M1 or NF430M1C using a 125A main breaker, can the panels be converted to a shunt trip type main?

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Issue:
Convert main breaker to a shunt trip

Product Line:
NQ Panelboards.

Environment:
Products sold in North America

Resolution:
The main breaker with a shunt trip would require 4 pole spaces, so it is not possible to convert the existing main breaker to a shunt trip version.
One option may be to backfeed a Main Lug Only panel with a shunt tripped EDB breaker, which would take up 4 available pole spaces.