10 circuits at 3.96mm pitch — the BOM fit check
The 1-1123723-0: This is a 10-position, single-row header on 3.96mm pitch, the Economy Power series workhorse for board-to-cable/wire connections.
The single-wall shroud with a friction lock is the defining mechanical feature. It mates with the standard Economy Power receptacle housing (TE part number 1-1123723-0's mating half is typically a 10-position receptacle like 1-1123723-1 or similar) — the lock clicks and holds the cable side against vibration from nearby contactors or fans. No secondary latch, but for a 7.5A signal/power line it's enough retention.