What This Mini-Fit Jr Receptacle Housing Is
It uses a 4.20mm pitch in a 2-row layout, with the same 4.20mm row spacing, giving each circuit enough physical separation to handle the series' rated current without thermal crowding.
This housing is the receptacle half of a Mini-Fit Jr power interconnect. It mates with the corresponding Mini-Fit Jr 5559 header (through-hole or vertical mount) to carry DC power from a board to a wire harness. The latch lock keeps the pair mated in applications with moderate vibration — think power supplies, industrial controls, automotive interior modules, and appliance PCB-to-harness connections.