Sönmez Transformatör Sanayi ve Ticaret A.Ş.

STS (Sönmez Trafo) is a well-established Turkish manufacturer specializing in power transformers, special-purpose transformers, and reactors designed for industrial facilities, transmission-distribution utilities, transportation, and marine applications.

Founded in 1976, STS has grown into one of the region’s most experienced companies in engineering, design, production, testing, and field services. Its headquarters and main production facility, located in Gebze, Türkiye, occupy 40,000 m² and house advanced manufacturing technologies supported by approximately 150 specialized personnel.

STS offers a wide product range including:

• Power & Distribution Transformers

• Dry-Type Transformers

• Industrial & Traction Transformers

• Converter / Rectifier Transformers

• Marine Transformers

• Reactors & Special Application Transformers

The company provides complete lifecycle support encompassing engineering consultancy, supervision, maintenance, repair, modernization, and 24/7 on-site services. STS also offers online factory acceptance testing (FAT) and comprehensive logistics solutions.

Commitment to international quality is demonstrated through certification to ISO 9001 (Quality), ISO 14001 (Environment), and ISO 45001 (Occupational Health & Safety) standards.

With proven expertise in customized transformer development, STS delivers reliable solutions that address the specific requirements of global customers across multiple sectors.