- CEO
- Sumpan Vongphan
- Full Time Employees
- 700
- Sector
- Producer manufacturing
- Industry
- Electrical products
- Address
- 516/1 Moo 4 Samutprakarn SP Thailand 10280
- IPO Date
- May 10, 2006
- Business
- Tirathai Public Company Limited manufactures, repairs, sells and maintains transformer equipment for electrical power systems in Thailand and internationally. The company produces power transformers rated over 10 mega volt amperes or above 36 kilovolts for electricity generators and suppliers; distribution transformers for receiving electricity from distribution lines of generating authorities; and special transformers designed to customer specifications; alongside services including transformer erection and installation, oil filling, maintenance, modification and repairs, testing, and rental. Tirathai also distributes electrical power equipment and provides custom metal work services such as welding, steel fabrication and construction projects. Founded in 1987 and headquartered in Samut Prakan, Thailand, at Bangpoo Industrial Estate, the company operates two manufacturing plants and serves domestic markets through the Metropolitan Electricity Authority and Provincial Electricity Authority, with international reach in Vietnam, India, Sri Lanka, Pakistan, Malaysia, Singapore, Philippines, Nepal and Australia. Tirathai holds technology transfers from Siemens Transformer Austria GmbH & Co KG and Fuji Electric Systems Co., Ltd., positioning it as Thailand's sole local producer of both power and distribution transformers. Recent developments include an academic collaboration agreement with Rajamangala University of Technology Thanyaburi signed on November 14, 2025; a strategic cooperation with Siemens Energy for transformer online monitoring announced in February 2021; receipt of the Carbon Footprint of Organization certificate in June 2023; and delivery of Thailand's largest and highest-voltage power transformer to the Electricity Generating Authority of Thailand in June 2022.