Board footprint and circuit count
The 1-1318300-2: The 3.96mm pitch sets the board footprint — a standard spacing for moderate-current power and signal headers. With 2 positions loaded, this single-row header is a minimal interconnect for a single power pair or a signal pair. The 7.5A per contact rating at 250VAC is typical for the Economy Power series; the tin-plated mating surface keeps contact resistance low for intermittent duty in lighting and general-purpose equipment.
Mating and retention in vibration environments
In a panel or enclosure where the wire is routed with strain relief, the lock keeps the pair mated during service. The single-wall shroud guides the plug during mating and protects the pins from bending. The 0.303" (7.70mm) mating contact length provides enough wipe for a reliable tin-to-tin interface.
Cross-check against the 1-1318300-1 sibling
The 1-1318300-1 is the 1-position version of this same Economy Power header. Both share the 3.96mm pitch, friction lock, tin plating, and 7.5A rating. The 1-1318300-2 adds a second circuit for a power pair or a redundant signal path — the board footprint is the only difference.