What This 96-Position DIN Receptacle Is
The 5650963-4: It's a Style C connector, meaning all three rows are fully populated — no missing positions to track on the BOM. The contacts are female sockets with a gold finish, which handles the repeated mating cycles a card-edge or backplane connector sees over the life of the chassis.
The mating half is a DIN 41612 male header (Style C, 96 positions) that plugs into this receptacle. The board locks are worth noting: they're not just a retention gimmick. On a through-hole connector this size, the solder joints alone take the mechanical load from the mating force and any cable strain. The board locks share that load and reduce the risk of lifted pads or cracked solder fillets over thermal cycling.