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39012020 Molex 5557 2 Pin 4.2mm Pitch Mini-Fit Connector Wire Harness Assembly

39012020 Molex 5557 2 Pin 4.2mm Pitch Mini-Fit Connector Wire Harness Assembly

Name: 39012020 Molex 5557 2 Pin 4.2mm Pitch Mini-Fit Connector Wire Harness Assembly
Brand: Molex
Rating: 5.0 (17 reviews)

This custom wire harness adopts original Molex 39-01-2020 (5557-02R) dual-row 2-circuit female receptacle housing, belonging to Mini-Fit Jr 5557 power connector series with standard 4.2mm pin pitch. It matches crimp terminals (Molex 39000079) and customizable stranded electrical wire, widely used for wire-to-board / wire-to-wire power interconnection in industrial control boards, home appliances, medical equipment, 3D printers, new energy small power modules and automation drive systems.

Model:
39012020
Brand:
Molex

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molex 39012020 connector cable Mini-Fit Jr wire harness 4.2mm pitch power cable assembly Molex 5557-02R wiring harness Wire-to-Board connector cable Mini-Fit crimp terminal cable

Product Description

The Mini-Fit Jr series features positive locking, polarized anti-reverse structure, fully isolated gold-plated crimp terminals, stable high-current load capacity up to 9A per pin, low contact resistance and strong anti-vibration performance. We provide finished cable assemblies with customizable wire length, wire gauge, single/double-head connectors, tin-dipped bare wire or secondary conversion plugs, fully RoHS compliant and certified.

Specifications

Connector Model	Molex 39012020 (5557-02R) 2Pin female receptacle
Rated Electrical	Max 9A per pin
Withstand Voltage	1500V AC
Applicable Wire	AWG20 ~ AWG24
Operating Temperature	-40℃ ~ +105℃

Advantages

Industry recognized Mini-Fit high-power compact connector: 4.2mm medium pitch realizes high current transmission in small PCB space, ideal for space-limited control board power input wiring.
Dual anti-loosening safety structure: Integral lock latch + optional TPA retainer prevents terminal withdrawal and accidental unplugging under equipment vibration, widely trusted for home appliance and industrial power circuits.
Polarized anti-misplug keyway design: Physical asymmetry of male/female shells completely eliminates reverse power connection burnout of expensive mainboard ICs and drive chips.
Full gold-plated phosphor bronze terminals: Low stable contact resistance, no heating or signal/power interruption after thousands of cyclic plugging and temperature cycling.
Wide compatible wire range: Covers mainstream small power stranded wire specifications for consumer and industrial electronics, easy unified material inventory management for manufacturers.
Harness one-stop custom service: Small batch prototype samples available, support finished cable assembly with labeling, bundling and waterproof heat shrink treatment for mass production equipment assembly lines.

Application

Household Kitchen & Small Home Appliances:3D printer hot-end power Molex 2Pin harness, oven control board power input wire, water dispenser heating module Mini-Fit cable, air purifier fan motor power connector assembly
Industrial Automation Control Equipment:Small servo driver auxiliary power wire harness, PLC control board low-voltage power jumper, packaging machine sensor power supply Mini-Fit cable assembly
Portable Medical Electronic Devices:Portable blood monitor main power cable, medical nebulizer control board wiring harness, home rehabilitation equipment internal power connector wire
Small New Energy & Energy Storage Equipment:Mini portable power bank internal power interconnection cable, small solar controller auxiliary power wire, lithium battery protection board BMS power jumper
Office & Intelligent Electronic Hardware:Desktop printer power supply internal wiring harness, smart locker control board power cable, mini industrial gateway low-voltage power input assembly wire

FAQ

Q1: What is the matching male connector model for 39012020?

A: Corresponding wire male plug housing is Molex 39012021 (5559-02P); vertical/right-angle PCB pin headers are also available for wire-to-board welding on control mainboards.

Q2: What maximum current can this 2Pin Mini-Fit harness carry safely?

A: Single pin rated max 9A with AWG18 thick wire; AWG22 standard wire stable continuous 5A, suitable for small power motor, heating element and board power supply circuits.

Q3: Can this harness withstand long-term vibration of industrial equipment?

A: Equipped with built-in lock latch + heat shrink strain relief at wire root, passed continuous vibration aging test, no terminal loose or wire breakage after long-term equipment operation.

Q4: What is the difference between 5557 Mini-Fit and fine pitch DF53 wire-to-board connectors?

A: Mini-Fit 4.2mm pitch is a power connector focused on 5–9A medium current transmission; DF53 0.6mm ultra-fine pitch is only for weak signal low-current circuits below 1.3A, cannot replace each other for power wiring.

Q5: Can we customize double-head harnesses with 39012020 female on both ends?

A: Fully supported, we can produce wire-to-wire jumper cables with dual 5557 female plugs, or cross convert to XT/EC5/other connector terminals as customer demand.