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Are electronic trip circuit breakers approved for use on NF or NQ panelboards as main breakers?

Can Micrologic electronic trip main or sub-feed circuit breakers be used in NQ or NF panelboards?  
Product Line:
NF or NQ
Electronic breaker application
Only the Micrologic Standard LI or LSI electronic trip unit can be used in NQ and NF panelboards as a main or sub-feed breaker.  The catalog number of the circuit breaker must include "U31X" or "U33X" if electronic trip is desired.  The Ammeter and Energy Micrologic trip unit circuit breakers are not permitted to be used.  

Please note that thermal-magnetic main and sub-feed circuit breakers are permitted.  
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