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Suppliers of power plugs, jacks & sockets improve insulation, flame-retardant attributes

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Industrial plug & socket

Suzhou Self-Man’s models SH005 and SH006 power plugs have 250VAC and 10A rated voltage and current.

Safety tops product initiatives. Childproof covers and built-in lightning protection modules are among the value additions.

Features enhancements in China's selection of power plugs, jacks and sockets concentrate on safety, with external designs also covered for added decorative value. Manufacturers adopt PA6T or polyphenylene sulfide insulation and UL 94-rated housing materials to prevent current leakage and electric shock, and ensure flame-retardant capability.

Suppliers such as Beijing Top include a protective lid. The maker has power sockets with covers that can be opened only when applied 40N pressure, making them childproof and splash- resistant. The company uses high-quality copper conductors to limit temperature rise at a maximum 20 C after one hour of full-load operation. This is significantly lower than the 45 C national standard. As further measure, the products come in UL9V-0-rated plastic housings.

There are also sockets that integrate lightning protection modules to safeguard against power surges. ABB’s Equip Series is an example.

In the jack category, SMD types are on the rise, thanks to wide adoption in portable electronics such as mobile phones, MP3/MP4 players, digital still and video cameras, and laptops. These come in various pin sizes, with the smallest at 0.5 and 0.7mm. At present, the variant represents about 40 percent of total output for the line.

As cosmetic improvements, medium and large businesses of wall-mount sockets employ crystal, stainless steel, wood and ceramic as alternative inputs to conventional PVC and ABS. Others, including enterprises turning out plugs and jacks, base external modifications on buyers’ specifications. Wenzhou Zhengpeng Electric Appliance Co. Ltd emphasizes trendy designs.

Makers are expanding production, encouraged by sustained 5 to 10 percent annual sales growth in past years and gradual export recovery in 2012. Suzhou Self-Man Electronics Industry Co. Ltd is increasing turnout anew by 10 percent this year. The supplier anticipates a 5 to 10 percent jump in outbound shipments. It sends 60 percent of output mainly to Europe, Japan and North America.

Products have a strong market in the home appliances, computer, communications and industrial sectors. Ningbo A-Line Cable & Wire Co. Ltd can turn out 150,000 power plugs and sockets per month. More than 60 percent of output comprises kinds for home appliances.

Manufacturers are also eyeing the automotive segment, which is an emerging hot application. The local industry, in particular, posted annual growth surpassing 20 percent in the past decade and remains in an upturn. The projected rollout is 35 million vehicles in 2020, rising by about 94 percent from 2010, according to Xinhua News Agency. At present, China’s power plugs and sockets for vehicle use support 250V rated input and 12V output voltage, and 5A rated current. These have nickel-plated copper conductors and flame-retardant ABS housings.

There are about 2,000 makers of power plugs, jacks and sockets in China, over two-thirds of which are domestic operations. They include international players such as Siemens and Panasonic. The booming lines will continue to attract homegrown and foreign entrants.

The Pearl River and the Yangtze River Delta regions are the main production hubs. Dongguan and Shenzhen in Guangdong province, and Wenzhou in Zhejiang province are the key locations.

Wide variety

Industrial plug & socket

China companies turn out different power plugs, jacks and sockets.

Power plugs come in 36, 125 or 250V and 2.5, 5, 10, 13 and 16A rated voltage and current. By core, there are 2, 3 and multicore types. Most releases comply with CE, TÜV, CCC, CSA and UL.

The line of power jacks comprises DIP and SMD variants with 1, 1.1, 1.3, 1.6, 2 or 2.5mm pins. Products conform to CE, CQC, RoHS and UL.

Power sockets are categorized into 2 and 3-hole kinds with rated input voltage from 100 to 260V. There are versions integrating a switch and an LED indicator. Units designed for plugs used in the US, Europe, the Middle East, Russia, Japan and South Korea are available.

The main materials in the manufacture of power plugs, jacks and sockets include copper, nickel, PVC and ABS. Makers source them locally.

Labor costs are expected to continue climbing. Most businesses project prices will increase by about 5 percent.

Taiwan: Multifunction types broaden selection

Taiwan suppliers of power plugs and jacks vary their lineups of stand-alone units with models that also work as fuse holders, switches or locks. They also offer plugs with built-in short-circuit and overload protection for added value.

Products are based on two major standards, IEC 60320 and NEMA. These have a 100 to 250V and 50/60Hz rating, with those at 125 and 250V leading output. By configuration, there are 2-pole/ 3-wire and 3-pole/4-wire versions.

NEMA jacks in 15, 20, 30A are commonly adopted in residential, commercial and industrial installations. The choices include single, duplex and triplex types with lock function.

In terms of mounting, there are SMD and DIP variants. The former target mainly computer, communication and consumer electronics applications. DIP kinds are for the home appliances and industrial sectors.

Makers also accommodate custom designs.

Releases comply with UL, CSA and VDE as required in major export destinations the US and Europe.

The key raw materials in the manufacture of power plugs and jacks include brass, phosphor bronze and plastic. For the last used in housings, suppliers adopt nylon 66, PBT, PC, PA9T or polyoxymethylene.

Power plug pins are tin-plated and jack terminals with additional silver and gold finish options.
High-end jacks adopt phosphor bronze.

Related reports:
Phone plugs: Makers stress customization, value added
Terminal blocks: High-voltage, SMD types on the rise

Product gallery

Industrial plug & socket

Hsuan Mao Technology Co. Ltd

Model: C9752
MOQ: 1,000 units
Delivery: 3 to 45 days
Description: Power jack; normal open type; nickel-plated; shielded; locating peg; 2.5mm-diameter pin; RoHS

Industrial plug & socket

Kaihua Electronics Co. Ltd

Model: PJ336BK01
Description: Power jack; 12VDC, 0.3A; 0.5 to 3kg insertion, withdrawal force; 5,000-cycle life span; for mobile phones, digital still and video cameras, portable audio equipment

Industrial plug & socket

Lih Sheng Precision Ind. Co. Ltd

Model: LD-0223
Description: Power jack; 500VAC/min withstand voltage; 30mohm maximum initial contact, 100Mohm minimum insulation resistance at 500VDC; 0.3 to 3kg insertion, 0.3kg to 2kg withdrawal force; 5,000-cycle life span

Industrial plug & socket

Ningbo A-Line Cable & Wire Co. Ltd
(mainland China)

Model: AL-103+AL-104
MOQ: 1,000 units
Delivery: 15 days
Description: Power plug; 250VAC rated voltage; 10A rated current; SAA

Industrial plug & socket

Rich Bay Co. Ltd
(mainland China)

Model: RG-01
MOQ: 500 units
Delivery: 42 days
Description: Power plug; 250VAC, 16A rating; 2,000VAC/min dielectric strength; 100Mohm insulation resistance at 500VDC/min; gold-plated pins; IEC 60884; for stereo systems

Industrial plug & socket

Unirise Electronics Co. Ltd

Model: UE-324
Description: Power plug; 250V rated voltage; 3, 5 or 13A rated current; PVC insulator

Industrial plug & socket

Wenzhou Zhengpeng Electric Appliance Co. Ltd
(mainland China)

Model: V8913S
MOQ: 1,000 units
Delivery: 15 days
Description: Power socket; 250V maximum voltage; 13A maximum current; Bakelite plate; 5,000-cycle life span; 86x86mm; CE

Note: All price quotes in this report are in US dollars unless otherwise specified. FOB prices were provided by the companies interviewed only as reference prices at the time of interview and may have changed.

Disclaimer: All product images are provided by the companies interviewed and are for reference purposes only. Those product images featuring products with trademarks, brand names or logos are not intended for sale. We, our affiliates, and our affiliates' respective directors, officers, employees, representatives, agents or contractors, do not accept and will not have any responsibility or liability for product images (or any part thereof) which infringe on any intellectual property or other rights of a third party.

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