Board fit and what the 2-loaded positions mean
The 1-1318301-2: This is a single-row, 3-position header from TE's Economy Power series, but only 2 of the 3 positions are loaded with pins. That means the board footprint has three through-holes, but the centre position is empty — check your circuit count before layout. The 3.96mm (0.156") pitch matches standard Economy Power housings and receptacles, so it mates with the same crimp housings used across the series.
Rated current and voltage — what drives the 7.5A
Rated 7.5A per circuit at 250VAC, with tin-plated contacts. Tin is fine for moderate mating cycles (under 50) and standard environments; the current rating holds up to the 105°C operating ceiling.