Design and Fit
The 431600304 carries 4 positions against the 5-position 431600105 and the 6-position 431600106 at the same 7.50 mm pitch and 18 A rating. The choice is strictly circuit count — the board footprint scales linearly with position count, so match the BOM line exactly. The 431603106 adds a board lock and right-angle orientation for edge-mount applications; the 431600304 is straight through-hole only.
