The 7.50 mm pitch gives the space needed for 18 A per circuit without crowding the terminals — you get enough creepage for the current without a bulky housing. The latch lock snaps home with an audible click, which matters when the harness runs through a cabinet that sees vibration from fans or relays.
This receptacle mates with the Sabre male plug housing (the matching half from the same 44441 series). The side-to-side stacking direction lets you gang multiple 2-circuit housings next to each other on a panel or bracket without extra tooling — useful when you need a multi-pair power distribution point built from identical 2-position blocks.