What this 4-circuit header does in a harness
It carries 4 circuits in 2 rows at a 4.20mm pitch, with a shrouded 4-wall housing that protects the male pins during mating and prevents misalignment.
The 4.20mm pitch and 0.165" row spacing set the PCB layout: a 2-row pattern with 4 plated through-holes. The contact length after the board is 0.140" (3.56mm), which determines the solder fillet height and clearance on the secondary side. This header mates with standard Mini-Fit Jr crimp receptacle housings (e.g., series 172445 or 172443) that accept 20-24 AWG wire with the matching crimp terminal. The insulation height of 0.500" (12.70mm) provides clearance for the receptacle's latch and wire exit angle, so verify z-height in the enclosure before layout.
The green insulation colour is standard for Mini-Fit Jr headers and aids visual polarity check during assembly. Glow wire compliant per IEC 60335-1, which is relevant for household and industrial appliances.