The 5031750302 is a Molex Female Socket Header, belonging to Series * and packaged in a Box. It sits in the Female Socket Headers subcategory under Pin Headers, Sockets & Housings — a clear signal that this is the receptacle half for a pin header, not a plug or a terminal block.
As a Female Socket Header, this part mates with a matching pin header from the same Series *. Confirm the pitch and circuit count of your board-mounted pin header before ordering — the socket header must match the pin header's position count and spacing to seat properly.