Board-to-wire header for 3.96 mm pitch harnesses
The 644968-4: It carries 8 positions in a 0.156" (3.96 mm) pitch housing, with 6 positions loaded — a common partial-population variant that saves cost when fewer circuits are needed.
Partial-population design and current derating
The 8-position body with only 6 positions loaded is a deliberate design choice: the unloaded positions can be used for keying or simply left empty to reduce contact count. For a typical 18 AWG wire, expect around 5 A per circuit at 25°C ambient; derate above that per the product drawing.