It uses a 0.156" (3.96 mm) pitch — wide enough to keep routing simple for power traces and to allow a generous creepage path for the 250 V rating.
The 3.96 mm pitch is the key board-layout constraint — it matches the standard VH-series receptacle footprint and gives enough room between pins for a 250 V creepage path without forcing an oversized board. The 10 A per circuit is a per-contact limit; with all 4 positions loaded, the header can carry 40 A total if the PCB trace and wire gauge are sized accordingly. The locking ramp provides vibration resistance — it is the primary retention mechanism in a VH-series harness.