The Molex 0039039102 is a 10-circuit, dual-row receptacle housing from the Mini-Fit Jr 5557 series. It uses a 0.165" (4.20mm) pitch and a latch-lock fastening system for positive retention in wire-to-board and wire-to-wire power harnesses. The housing is free-hanging (in-line) and accepts female socket crimp terminals — the contacts are not included and must be ordered separately. Typical applications include power distribution inside enclosures, server PSU harnesses, and automotive interior connections where the latch lock keeps the pair mated under vibration.
Key Specs That Drive the Fit
The 4.20mm pitch is the standard Mini-Fit Jr spacing — it sets the footprint for the mating header and the crimp terminal family. The 10 positions in 2 rows give a 2x5 layout, which is a common circuit count for moderate-current power distribution. The latch lock provides audible and tactile feedback on mate, which is useful in harness assembly where the operator needs to confirm full seating without a visual check. The housing is molded from black PA66 (Nylon 6/6), a standard insulator for this class of connector. It is rated for the full Mini-Fit Jr current range when paired with the correct crimp terminal — the housing itself does not limit current, the contact and wire size do.
Mating and Termination
This receptacle mates with the standard Mini-Fit Jr 4.20mm pitch header (male pin) — the latch lock engages with the header's locking ramp. Termination is crimp-style: the female socket contacts are crimped onto the wire, then inserted into the housing cavity until the terminal retention tang locks. The housing accepts the standard Mini-Fit Jr crimp terminals (e.g., Molex 44476 series for 18-24 AWG).