What does the `UOL9` mean on the end of catalog number NJNF36400E20AAUOL9?

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The AA is an auxiliary contact, UO is a 24Vdc under voltage trip, which are the same for the Powerpact L-frame. The L9 is a disconnect harness (S29272) factory installed. For Powerpact L:

YH1 Wiring Harness for all installed non-communication accessories except neutral CT and ZSI
YH2 Wiring Harness for all installed non-communication accessories PLUS neutral CT
YH3 Wiring Harness for all installed non-communication accessories PLUS ZSI
YH4 Wiring Harness for all installed non-communication accessories PLUS neutral CT and ZSI