This 2.0 mm pitch, dual-row, wire-to-board connector features a secure locking system and low insertion force contacts which allow for improved workability in equipment assembly lines. The mating lengths on the header side of the ground and signal/power pins are different in length to provide a mating phase differential of 2.4 mm. This enables a reliable sequence in the insertion and withdrawal process when connecting the header to the socket while improving circuit protection and safety of electronic equipment.