What the ratings mean for your selection
The 0430450425: The 8 A per-circuit current rating is governed by the gold plating on the mating interface — 15.0 µin (0.38 µm) of gold over the brass contact body gives low insertion resistance and good fretting resistance at the plug interface. The post side uses 100.0 µin (2.54 µm) of tin, which is thicker and suited to the solder-side reflow and any post-insertion stress from the kinked pin hold-down. These are separate镀层 zones doing different jobs: if your application stresses the mated interface repeatedly, the gold grade is what you are buying. The 600 V rating exceeds most mid-power 3.00 mm pitch families. If your circuit runs above 600 V, this header is in a short list at this density; confirm creepage and clearance geometry against your board stack-up before committing. The 4-wall shroud, locking ramp, and board-lock features all work together: the shroud prevents mis-mating on three sides, the locking ramp gives the plug a positive snap-in that survives vibration, and the board-lock anchors the header to the PCB before wave or hand-solder. The insulation height of 0.390 inches (9.91 mm) sets the header's standoff above the board surface — relevant if your plug housing has a depth pocket that must clear the board.
Typical applications
Micro-Fit 3.0 headers are used as board-to-cable power and signal interconnects in harness assemblies across automotive, industrial, medical, and telecom equipment. The 4-circuit count suits low-port-count power branches, sensor feeds, or actuator controls where a dual-row 3.00 mm pitch footprint saves board space over equivalent single-row connectors. The LCP housing material carries a UL94 V-0 flammability rating, which is the baseline for most equipment safety standards.