The 2-2106003-4: The 4.00 mm cable and board-side pitch gives enough spacing for discrete wire routing without crowding the board edge — a clean fit for low-density signal or power-tap applications where a ribbon cable is overkill. The natural housing and tin contacts suit interior, low-mating-cycle duty inside an enclosure.
IDC termination for individual wires — not ribbon cable — means each 22 AWG conductor is pressed into its own slot in the housing. The closed-end feature blocks the far side of the housing, preventing the wire from pushing through past the contact.