The 2-178128-2 housing accepts Dynamic D-3200 series female socket contacts, crimp termination. The exact contact part numbers depend on wire gauge — typically 20-16 AWG for the standard power contact. The polarizing key in the housing prevents mismating with the wrong header, but the contact itself must be fully seated and locked into the cavity; the housing has a secondary lock feature that retains the terminal after insertion.
What is the mating connector?
The header is typically a through-hole or right-angle PCB mount part, with male pins that engage the female sockets inside this housing.
Where is it used?
The Dynamic D-3200 series is a power interconnect family common in industrial control panels, power supplies, and automotive body electronics. The free-hanging (in-line) mounting lets it terminate a cable assembly that plugs directly into a board-mounted header.