The 4-1123723-3 is a 3-position, single-row vertical header from TE's Economy Power series. The friction lock provides a positive hold against casual vibration and cable tug, though it is not a locking ramp — expect a firm pull to disengage, not a secondary latch. The single-wall shroud guides the mating receptacle but leaves the contact tips partially exposed for visual alignment.
For a 3-position single-row board-to-wire connection at 3.96mm pitch, the 4-1123723-3 is the correct Economy Power member.