15-position right-angle header for wire-to-board power runs
The 1-640387-5: This is a 15-position, single-row header from the MTA-156 series, pitched at 0.156" (3.96mm) — wide enough to handle 600VAC and current limited only by the attached wire gauge.
Friction lock and single-wall shroud for secure mating
The friction lock is a positive retention feature — when you push the mating MTA-156 housing onto the header, you should hear it click. The 1-wall shroud provides basic polarization: the mating housing only goes on one way, so you can't misalign the pins.