About us


Tesar has been designing and manufacturing Cast Resin Transformers for more than 35 years. Tesar company was established in 1979 as a member of Eni Group and it was first Italian company to implement the technique of resin casting for transformers. Later, our production range was extended to Oil Immersed and Instrument Transformers. Nowadays, having become part of R&S Group, Tesar is one of worldwide leading Companies with high research and technology innovation standards


From the A1 motorway follow the direction to Arezzo, at the end of SS697 turn left (north) on SR71 following the direction to Bibbiena. After 7 km exit and take SP43 follow the direction to Anghiari, after 5 km you will reach the company building.






Tesar Worldwide



In 2000 Tesar established a joint venture with Tadeo in Argentina to supply transformers to South American market.



For more than 7 years Tesar had a sales office in Poland. In February 2013 a production plant for cast resin transformers was built.



Due to the strategic importance of the region, Tesar opened in 2007 its own sales office in Dubai. With this office, the local presence in the Gulf countries has been improved.


Abu Dhabi

In September 2012 Tesar started a new production site in Al Ain to supply local market.

Values and Quality

With high-end electrical products and innovative solutions we are a trusted partner to our customers. Experienced, long-term employees and junior employees that continuously develop form the foundation of our company. Our processes are ISO 9001 and ISO 14001 certified. Job security and the health of our employees are very important to us. Tesar is proud to claim fully approved CESI Laboratory and an impressive portfolio of routine, type and special tests, following the IEC standards in force or by other methods agreed with the client. In addition, our Transformers are also GOST certified.

a company of RS Group