What options do you want?
Breaking down the number you gave us and looking in catalog-
D - general duty
U - non fused
first 2 - 2 pole unit
23 - 100 amps
N - with neutral
RB - NEMA 3R enclosure
Your number doesn't exist in the catalog - a three pole version with all other things the same does exist DU323RB, but does not have a neutral terminal.
What is listed in catalog in the place where your number potentially could appear is instead a QO2000NRB - which is a molded case switch with no automatic overcurrent protection installed in an enclosure.
You could go with a fused general duty switch D223NRB, or a heavy duty fused H223NRB, or heavy duty non fused still makes you use a three pole unit HU363RB, also does not have a neutral terminal.
I don't know if you can order separate neutral terminals - not seeing any in accessories, just equipment grounding kits. Polaris connectors for the neutral is an option if you must splice a neutral.