RSV 12 - One of the latest developments of Voltap

Retrofit solutions by Voltap

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As part of the continuous process of expanding the Voltap product range RSV 12 OLTC enters serial production.

Voltap offers the opportunity to replace the old tap-changers with new ones, both with vacuum interrupters and with arc quenching in oil.

Successful professional career in an international company with defined traditions and perspective future

About Us

We at Elprom believe that the power industry plays a pivotal role in building a more productive, sustainable future. We believe in enabling our customers’ success by helping them transform their operations into a more profitable and reliable venture. Our passion comes from our expertise in providing solutions for transformer manufacturers, grid operators and energy producers for over 70 years. At the heart of Elprom are more than 500 talented employees who make us confident in meeting the challenges of tomorrow. To respond better to the trends in the power industry we are launching our new brand for on-load tap-changers VOLTAP. VOLTAP is a registered trademark of Elprom Heavy Industries, which marks a new stage in the long history of the development of our company.


pcs produced






pcs produced





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Unique design with vacuum technology

RSV 9 and RSV 9.3 SERIES

Universal tap changer in vacuum technology


Compact design in vacuum technology


High-power solution with vacuum interrupters

PBV Series

On active part of the transformer

Markets In: Europe America Asia Africa
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Markets & Clients
image/svg+xml Markets & Clients


Elprom is the start in my professional development and I can describe it as the right place for a young engineer who seek to meet diverse situations in the field of mechanical engineering.

Trayana Tsaneva

Design Engineer

My work in the Sales Department is challenging, giving me the opportunity to travel anywhere in the world and meet different people and to improve my professional and personal qualities every day.

Silviya Evtimova

Sales Manager

Working at Elprom is a great professional achievement. It is a pride and satisfaction to be a part of the company and get the joy of success.

Nataliya Grigorova

Consultant TC Sales Department

As a technical expert with over 10 years of experience in Elprom, I have had the privilege of working my way up through various management roles within our company.

Daniel Kurtelov

After Sales Manager

Collaborating with an engineering team involves more than just finding solutions to various issues. It is the driving force that can provide a significant advantage to any company.

Dobrin Arsov

Tap-Changers Design Section Chief

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June 2024

Successful meetings at CWIEME Berlin 2024

We are delighted to announce that Elprom Heavy Industries took part in the 2024 edition of CWIEME held in the Berlin Messe from the 14th till the 16th of May.  Our company presented its solutions in the power industry - on-load tap-changers with and without vacuum interrupters, motor drive units, off-circuit tap-changers.