The Molex 430451812 is the 18-circuit, dual-row member of the Micro-Fit 3.0 43045 series — a shrouded 4-wall vertical header with a 3.00 mm mating pitch and a locking ramp for positive retention.
The 3.00 mm pitch and 0.118" row spacing give enough creepage for the 600 V rating without forcing an oversized board footprint.
Termination is through-hole with a kinked pin — the bend locks the pin in the plated hole during solder wave, preventing float and ensuring the 0.125" post length sits correctly for the board thickness and solder fillet.