It's the low-circuit-count end of the series — useful when your BOM calls for a small power or signal tap off the board without wasting real estate on unused positions.
Board lock holds it down through solder and shock
On a 3-position part the mechanical advantage is small, but the lock means the solder joints don't take the full strain from a tugged wire.
The closest functional cross-shop is TE's 1-292164-1 from the CT series: same 2.00 mm pitch, same single-row shrouded header format, but with 11 positions instead of 3, a right-angle orientation, and a detent lock instead of a latch holder. For a vertical, low-count, latch-holder fit, this Grace Inertia part is the one.