22-position, 4.14mm pitch vertical header with locking ramp
Its 0.163" (4.14mm) pitch and 0.163" (4.14mm) row spacing define the PCB footprint and dictate the mating receptacle selection.
Tin-plated contacts and UL94 V-0 housing
The brass contact material provides good conductivity and formability. The white insulation color aids visual inspection of the mated connector. Rated at 600VAC, the header supports line-voltage applications within its temperature and current limits.
Comparison with 4-1775099-7 (ATX series)
The closest functional second-source is the 4-1775099-7 from the ATX series: 20 positions vs 22, 0.165" (4.20mm) pitch vs 0.163" (4.14mm), and 120.0µin (3.05µm) tin plating vs 150.0µin (3.81µm). The 4-1775099-7 uses square pins and is rated 9 A at 250VAC, while the 1-794078-0 uses circular pins and is rated 600VAC with current depending on wire gauge.