KH-A42002-02A Wire-to-Board Header: 1×2P Single-Row Straight Pin Connector, Rated for 7A Current, Ideal for Low- to Medium-Power Applications

In power supply systems, wire harness connections, and industrial control signal transmission, 4.2mm-pitch 5557 series connectors have long been a classic choice in the industrial market. Thanks to their excellent current-carrying capacity, reliable mechanical locking structure, and mature manufacturing compatibility, they are widely favored by engineers.

The Kinghelm KH-A42002-02A is a 1×2P single-row straight-pin wire-to-board connector from this series. Combining high-power transmission capability, convenient assembly, and environmental durability, it is an ideal connector for wire-to-board connections in low- to medium-power equipment.

Kinghelm KH-A42002-02A Product Image

1. Product Structure and Mounting Method

The KH-A42002-02A features a single-row, 2-pin configuration with a standard 4.2mm pitch and a straight-through PCB mounting design. Its height above the PCB is 12.8mm. The through-hole pin structure is fully compatible with conventional PCB wave soldering processes, making soldering straightforward and suitable for automated assembly lines, effectively reducing factory assembly time.

Compared with connectors featuring smaller pitches, the 4.2mm spacing provides greater clearance between adjacent pins, offering an improved insulation safety margin under high-voltage operating conditions and helping reduce the risk of arcing and short circuits. This makes it particularly suitable for wire harness connections in DC power circuits and power module input/output terminals.

The product is supplied in bag packaging, meeting the procurement requirements of both prototype testing and small- to medium-volume production.

As part of the standardized 5557 series, the KH-A42002-02A is also available in other pin-count configurations, including 03A, 04A, 05A, and 06A. Customers can select different pin counts according to their circuit requirements, enabling standardized wire harness solutions across an entire product range.

2. Key Electrical Performance Specifications

In terms of electrical performance, the KH-A42002-02A delivers reliable and stable operation. It supports a rated current of up to 7A (AC/DC) and a rated voltage of 600V, making it suitable for the power supply requirements of most low- to medium-power modules.

Its key electrical specifications include:

• Rated Current: 7A (AC/DC)
• Rated Voltage: 600V
• Contact Resistance: Max. 20mΩ
• Insulation Resistance: Min. 1000MΩ
• Withstanding Voltage: 1500V AC/minute

These electrical specifications help minimize the risks of excessive heating and current leakage during long-term operation, ensuring reliable and stable equipment performance.

The terminals are made of brass with a tin-plated surface finish. The brass base material offers excellent electrical conductivity, while the tin plating helps prevent oxidation, improve contact stability over repeated mating cycles, and reduce contact resistance fluctuations. Even in applications involving repeated disconnection and reconnection or extended storage periods, the connector maintains reliable electrical contact.

3. Housing Material and Environmental Durability

The insulating housing is manufactured from PA66 nylon, featuring a UL94 V-2 flame-retardant rating. This material offers good heat resistance and dimensional stability, supporting reliable operation across a temperature range of -25°C to +85°C.

It is suitable for a variety of applications, including indoor household appliances, industrial control equipment, and outdoor lighting equipment exposed to significant temperature variations.

PA66 also offers excellent mechanical toughness, helping prevent the locking structure from becoming brittle or breaking easily. When mated with compatible connectors in the 5557 series, the locking mechanism provides a secure fit and reliable retention, helping prevent accidental disconnection under vibration conditions.

This helps address equipment failures and unexpected downtime caused by loose wire harness connections.

Its stable material properties also enable the connector to withstand temperature cycling and moderate vibration, helping reduce after-sales maintenance costs and equipment failure rates.

Kinghelm KH-A42002-02A Datasheet

4. Main Application Scenarios

The KH-A42002-02A supports a wide range of applications.

Household Appliances: Commonly used for internal power wiring connections in water heaters, refrigerators, and fans.

Industrial Automation: Suitable for power circuit connections in sensors, drives, and compact PLC systems.

Consumer Electronics and Power Supplies: Widely applicable to PC fans, switching power supplies, LED driver modules, and high-power LED strip lighting.

Security and Surveillance: Suitable for power connections in security monitoring equipment and related electronic systems.

New Energy Applications: Can also be used in low-voltage auxiliary control circuits for new energy equipment.

The compact 2-pin configuration is ideal for single-channel positive and negative power connections. Its streamlined design avoids unnecessary pins and minimizes PCB layout space, leaving more room for other components and structural design requirements.

Engineers can also combine it with other pin-count configurations in the same series to build flexible and standardized wire harness connection solutions.

5. Advantages of Domestic Alternatives and Quality Assurance

The Kinghelm KH-A42002-02A is manufactured in accordance with applicable industry standards and general connector specifications. Its drawing tolerances are precisely controlled, while its pin positions and PCB solder pad dimensions follow standardized design requirements.

It is compatible with commonly used 5557 series connector solutions, making it a convenient replacement option for engineers looking to substitute imported components, reduce BOM procurement costs, and minimize supply chain lead-time risks.

Kinghelm has extensive experience in RF antennas, connectors, and electronic interconnect components. Under the leadership of Song Shiqiang, the company continues to improve its product portfolio, including 5557 connectors, Wafer connectors, pin headers, female headers, and FAKRA connectors.

By maintaining control over the entire manufacturing process—from mold development and injection molding to terminal stamping, electroplating, and finished-product inspection—Kinghelm ensures consistent product quality and reliable manufacturing performance.

Overall, the KH-A42002-02A combines a 7A current rating, flame-retardant housing material, wide operating temperature range, easy through-hole soldering, and standard 4.2mm pitch. It offers a balanced solution in terms of electrical safety, mechanical reliability, and cost-effectiveness.

Whether used in prototype development and testing or large-scale production projects, it is a dependable wire-to-board power connection solution.

As domestic component substitution continues to gain momentum, Kinghelm remains committed to optimizing this product series and providing reliable domestic connector solutions for customers in industrial control, lighting, household appliances, and power supply industries.

About Kinghelm

Kinghelm(www.kinghelm.net) specializes in microwave RF and connectivity technologies. Its extensive product portfolio covers BeiDou/GPS antennas, Bluetooth antennas, Wi-Fi antennas, RF jumper cables, signal connectors, board-to-board connectors, wire-to-board connectors, electronic switches, and other related components.

Its product range includes popular RF coaxial connector models such as KH-IPEX-K501-29, KH-SMA-K513-G, KH-SMA-KE-Z, KH-SMA-KWEI7-G, and KH-MMCX-Z, as well as USB connectors such as the KH-TYPE-C-16P.

Kinghelm products are widely used in new energy vehicles, smart terminals, the Industrial Internet, smart cities, commercial aerospace, automotive electronics, and low-altitude unmanned aerial vehicle (UAV) applications.

Supported by its modern manufacturing facility in Luzhai, Guangxi, China, and intelligent flexible production lines, Kinghelm has established a comprehensive manufacturing system covering product design, mold development, performance testing, and mass production.

With integrated development and manufacturing capabilities, the company can provide large-volume production, consistent product quality, and short delivery lead times, delivering reliable and highly adaptable connectivity solutions for customers across various industries.

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