About Trio Engineering

Founded in 1983, Trio Engineering is an international Electronic Manufacturing Services Company with its main manufacturing facilities in Guangzhou, China.

We provide engineering and electronic contract manufacturing services for a wide range of industries. With our experienced team coupled with an outstanding track record and reputation, we have been recognized by our customers as a reliable partner for quick-turn services. Addressing high-complexity, advanced PCB assemblies and Turn-Key System Assembly solutions that meet dynamic business needs and new product introductions.

Trio specialises in the manufacture of custom and standard Power Supplies, Industrial Battery Chargers, Inverters, Filters and Transformers / Magnetics for Industry. Trio has an extensive export base in Europe, USA, Asia and Pacific.

We are also recognised as an ideal partner for low to medium volume/high mix contract manufacturing, and as your manufacturing requirements grow, we offer the option to transfer volume production to our efficient and competent manufacturing facilities in China.
Trio understands the complexities around Product Lifecycle Management from design to supply chain through production and delivery. Our relationships with our customers, suppliers, contractors and employees are based on trust leading to mutual success. All relationships are started with the intention of becoming long term.

Our long-standing experience with New Product Introductions has proved to be valuable to our customers, some of whom have just celebrated their 20th Anniversary of partnering with Trio.

In 2018 we opened two new sales and support offices in Dublin, Ireland and Munich, Germany to help us better serve our growing customer base in Europe. These offices are supported by our 1600 employees located between its Corporate Headquarters in Hong Kong, the Manufacturing Facility in Guangzhou.

In 2017, Trio generated a combined revenue of USD 100 million. This has been achieved by an average annual growth rate of 30%.

In November 2017, Trio Engineering completed a successful listing on the Hong Kong Stock Exchange and in November 2018, Trio Engineering will be celebrating its 35th Anniversary.

In October 2019, Trio signed a lease for its first European Facility in Waterford, Ireland. This facility will be used initially for Assembly operations and Warehousing.

In November 2019, Trio signed a lease for its second Asian Facility in Pluak Daeng, Rayong, Thailand. This facility will be up and running by Q2 2020 and will be used for full PCBA Manufacturing and Turn-key solutions.


1983 – Company Incorporation, Company founded in Hong Kong
1991 – Factory Setup in China, 1st Factory opened in Guangzhou
1993 – Established Magnetics Winding Division, 1st Factory opened in Guangzhou
1994 – UL Certificate, Obtained UL 1446 Certification
1995 – Power Supply Production, Started Box Build Power Supply Production
2000 – ISO9001 Certification. Factory move to the current Nansha, Guangzhou Location
2003 – Factory Expansion, Block 3 Completed
2010 – Obtained ISO 14001, Environmental Certification
2012 – Obtained ISO 16949, Automotive Certification
2014 – Production and Warehouse Area Expansion
2015 – Obtained ISO 13485 Medical Certification. Established PEMS
2016 – TEIG Established, Trio Industrial Electronics Group
2017 – TIEG Listed on Hong Kong Stock Exchange. Opened Guangzhou Office
2018 – EU Offices in Ireland & Germany, Obtained ISO 20071 Certification
2019 – Factory Expansion in Panyu
2019 – Industry 4.0 Level 1i Maturity Recognition
2019 – EU Assembly Operation & Warehouse Facility in Waterford, Ireland
2019 – 2nd Asian Factory in Rayong, Thailand

What we offer

Trio is a highly capable EMS partner providing support throughout the full design and manufacturing process. We have the capabilities to design, prototype, NPI and volume manufacture your products.

Trio has the specialized skills required for the manufacturing of standard and Custom Power Supplies, Industrial Battery Chargers, EV Chargers, Inverters, Filters and Transformers / Magnetics for Industry. Trio also has the expertise in full System Assembly/Box Build to support a wide range of sectors.

We build your product right the first time.

Our core competencies lie in the following areas:

Trio relies on processes and procedures that have been developed and tested for 35 years. We ensure the highest possible quality standards through our state-of-the-art production processes, supported by our in-house developed and patented QMS (Quality Management System) & MES (Manufacturing Execution System) developed by the Trio Engineers (known internally as T-MICS).

  • Agility and Flexibility

  • Strong NPI Support
  • Design Reviews and Value Engineering
  • DFx Advice (Design for Component optimisation, Manufacturing, Assembly, Testing, Installation and Recycling)

  • Low to Medium Volume/High Mix

  • Fast-track Prototyping Assembly/Debugging
  • Full Turnkey System Manufacturing
  • Industry 4.0  Level 1i

  • THT & SMD Assembly

Certifications – Quality is in our culture.

Our desire to consistently deliver world class products and services with total customer satisfaction is the driving force behind our Quality Assurance policies and procedures. We meet and adhere to the following international standards:

ISO9001 – Quality Management system (QMS)

ISO13485 – Quality Managment for Medical Devices

ISO14001 – Environmental Management Certification

ISO 27001 – Information Security Certification

IATF 16949:2016 – Automotive Quality Management System Certificate

OHSAS18001 – Occupational Health and Safety Management Certification

Industry 4.0 Maturity Recognition

(Level 1i)

Real-Time Information Generation

UL Traceability requirements for PCBA (category ZPVI2 )

UL1446 Insulation systems (E218598)

IPC Member

CCC product certificate

FDA registration

UL/CE/CSA – We are experienced in releasing products with the above compliance approvals