What it is and where it sits in the series
The 430450406: At 3.00 mm pitch the 43045 series carries 8 A per circuit at 600 V — the shrouding and contact geometry handle the current density in a footprint that is still hand-assemblable and routing-practical.
Mating and termination
Termination is solder to the PCB pads — the right-angle orientation means the header sits flat against the board edge and the contacts present horizontally for SMT reflow. Mating half compatibility is governed by the Micro-Fit 3.0 receptacle housing series; the shrouding and locking ramp on the 430450406 mate with the corresponding polarised cavity and latch on the receptacle body. Confirm the receptacle's panel-mount or cable-entry orientation before committing — the board-lock terminations on this header are fixed to the PCB and the receptacle must float to engage the latch on insertion.