VOLTAP is the On-Load Tap-Changer (OLTC) brand of Elprom Heavy Industries, built on more than 70 years of experience in delivering solutions for transformer manufacturers, grid operators, and energy producers.

Our focus is to be a reliable partner, providing engineering-driven solutions and high-quality products that support our customers in adapting to the evolving demands of modern power systems.

VOLTAP offers a comprehensive range of OLTC solutions for transformers, engineered for dependable voltage regulation, high operational reliability, and long service life across applications such as rail traction, mining, hydro, solar, wind, and steel industries.

All products are developed and tested in accordance with IEC standards, with type testing performed in an ISO/IEC 17025 accredited laboratory.