Lemi Trafo

Corporate slogan

„Powering Progress, Sustaining the Future“

Insight into the philosophy of the company

At Lemi Trafo, we aim to be a trusted European manufacturer of high-quality, energy-efficient transformers. We drive innovation, support sustainable energy systems, and empower communities around the world with reliable power solutions.

Products

Oil-immersed distribution transformers

• with rated power from 25 up to 25,000 kVA and voltage class up to 36 kV

Cast resin distribution transformers

• with rated power from 100 up to 5,000 kVA and voltage class up to 36 kV

Special type transformers

Key competitive advantages

✅ Proven Expertise with Long-standing Tradition – Nearly 30 years of experience.
✅ Wide Power Range & Customization – 25 kVA to 25,000 kVA (Oil-Immersed Transformers ) and 160KVA – 3150KVA (Cast Resin Transformers)
✅ Certified Quality & Standards Compliance – All transformers are built in compliance with EN 50464-1, IEC 60076-11, ECODESIGN EN 50588-1 and EN 50541-1 and other relevant international standards.
✅ Eco-Conscious Manufacturing – Commitment to sustainability and environmental responsibility.
✅ Skilled Workforce & In-house Expertise – A dedicated team of over 180 professionals, including engineers, technicians, and quality specialists.
✅ Strong International Footprint – Long-standing customers throughout Europe and worldwide.
✅ Balanced Cost-Quality Ratio – A strategic focus on delivering premium quality at a reasonable price.
✅ Agility & Customer-Centric Approach – Flexible production processes and personalized customer service.

Location

Head office, Sales and Product development: Bulgarian company which is located in the town of Pernik, near the Bulgarian capital Sofia (30km)

Company Profile

Lemi Trafo JSC is a company with strong traditions, continuity, and a steadfast commitment to excellence.
For nearly 30 years, our core business has remained unchanged — the design and production of transformers.

We specialize in manufacturing three-phase oil-immersed distribution transformers with rated power ranging from 25 kVA to 25,000 kVA. Our portfolio includes both hermetically sealed and conservator-type transformers, all engineered in full compliance with local and international standards. We also produce standard cast resin distribution transformers according to EcoDesign and standard losses from 100 kVA to 5,000 kVA and insulation class up to 36 kV, corresponding to classes E2, C2, and F1 and in compliance with IEC 60076-11 standard. Each transformer is adapted for seamless installation in complete transformer substations or on steel-lattice poles.

To meet diverse customer needs, we offer transformers with aluminium or copper windings, and we produce units with various levels of energy loss, in accordance with EN 50464-1, as well as custom-engineered designs, tailored for specific applications.

At Lemi Trafo, our primary focus is to deliver uncompromising quality at a competitive price. We are a people-centered company, driven by the mission of contributing to a sustainable and greener future for the next generations. Our production facility is structured for efficiency and precision, powered by a team of over 180 skilled professionals.

We strictly adhere to the highest industry standards for quality, and we continuously seek improvement and innovation to stay ahead of evolving requirements.

Our transformers are part of the electrical infrastructure in several European countries, including Germany, Sweden, Finland, Denmark, Austria, Hungary, the Czech Republic, Slovakia, and Romania. We are also proud to support energy infrastructure development in Iraq and Lebanon, contributing to a reliable electricity supply in regions in need of fast and effective energy solutions.