Board-fit and orientation — 4 positions, 2.54 mm pitch, SMD right-angle
The 147323-3: A keying slot prevents reverse insertion — you should hear the latch holder click when the pair mates fully. Board lock and solder retention features anchor the header during reflow — the locks grip the PCB, reducing pin lift from the solder paste's surface tension. This is a practical advantage for high-volume SMT lines where tombstoning is a risk.
The board-to-board or cable style means it can connect a ribbon cable or a discrete-wire harness to the PCB. The 3 A per-contact ceiling is consistent with signal-level duty in these sectors.