Mating half and termination
The 0430451019 terminates to the PCB via SMT solder tails — the solder retention bars on the posts hold the header in the paste before reflow, reducing tombstoning on fine-pitch placements. Mates with the matching Micro-Fit 3.0 43045 series receptacle housing; the 4-wall shroud and locking ramp together define the polarisation key — confirm the housing-to-header keying configuration in the series datasheet before specifying, as the 43045 family includes multiple keying options. The insulation height of 0.390 in (9.91 mm) sets the post-protrusion above the board surface and matters when the connector sits adjacent to tall components in a dense board layout.
Where this class of connector is used
Micro-Fit 3.0 headers are used as board-to-wire power interconnects in harness assemblies across industrial automation, telecom infrastructure, medical equipment, and automotive electronics — anywhere a compact, high-current connector pair is needed at board level. The UL94 V-0 flammability rating and the -40°C to 105°C operating range make the series suitable for equipment that must perform in unconditioned environments — industrial floor equipment, outdoor enclosures, and under-hood automotive zones all push the lower bound to at least -40°C and the upper bound past what a typical office-grade connector tolerates.