Only 4 of the 7 positions are loaded with contacts, so the BOM position count needs to match the circuit count, not the housing size. The unloaded positions act as keying or polarization features.
Pitch and footprint for board layout
The 0.197" (5.00 mm) pitch is a standard spacing for power headers, accommodating the insulation height of 0.504" (12.80 mm) above the board.
Contact plating and environmental range
Silver plating on both the mating tab and the solder post gives a low-resistance connection for power circuits.
The 5.00 mm pitch on 1-2232511-7 supports higher voltage (250 VAC vs 50 VAC) and is better suited for power distribution rather than signal-level wiring.