Overview

ABB UNIREC H2 water-cooled thyristor rectifier is ABB’s newest solution for small to large-scale hydrogen production.

Designed to supply stable, high-efficiency DC power, UNIREC H2 is optimized for integration with industrial electrolyzer systems.

Built on ABB’s proven thyristor technology, UNIREC H2 delivers up to 99.6% conversion efficiency with rugged reliability and modular flexibility for long term operational efficiency and lower costs.

Explore the KEY BENEFITS

<p>UNIREC H2 combining the reliability, stability and efficiency of thyristor technology with a lean and modular design suitable for any plant size.</p>

Faster project timeline, reduced footprint, simpler maintenance, cost-efficiency

<p>Thanks to the lean design, UNIREC H2 lets you achieve your project goals faster and simplifies long term maintenance</p>

Decades of uninterrupted operations

<p>Thanks to the thyristor technology reliability</p>

Low electricity losses

<p>Thanks to an efficiency rate up to 99.6%</p>

Smooth and fast integration in existing systems

<p>Its modular, standardized architecture and compact design make integration into electrolyzer-based hydrogen plants fast, predictable, and low-effort</p>

Expand without re-engineering

<p>Future-proof your investments with a modular architecture that grows with the project and does not require to go back to the drawing board</p>

Lower project risk, improved worker safety, and fast regulatory approval

<p>The rectifier’s robust, proven design minimizes operational risks, ensuring safe, stable, and continuous hydrogen production even under demanding industrial conditions</p>

Industry applications

ABB UNIREC H2 power rectifier is ideal for

Green hydrogen production plants, Industrial-scale electrolyzer systems, Renewable energy-to-hydrogen projects

Resources

UNIREC H₂ Brochure

A complete overview of the air-cooled and water-cooled variants, technical capabilities, architecture options and key benefits.

UNIREC H₂ Technical Data Sheet

Detailed specifications including DC output ranges, cooling options, protection functions, efficiency values and connectivity protocols.

UNIREC H₂ Deployed in Harsh-Climate Hydrogen Project

Learn how ABB’s rectifier technology enabled continuous hydrogen production in challenging environmental conditions.

Technical data

UNIREC H2 - Water cooled offers the following performance for a single 6 pulse stack (bridge):

A_ef Water-cooled 6,000

<p>Maximum continuous rectified current in single configuration (maximum 1,000 V_d)</p>

A_ef Water-cooled 12,000

<p>Maximum continuous rectified current in dual configuration (maximum 1,000 V_d)</p>

Hz 50/60

<p>Input frequency</p>

°C 5 to +40

<p>Ambient temperature operating range</p>

°C -25 to +55

<p>Storage temperature range</p>

m.a.s.l. 1,000

<p>Maximum operating altitude without derating</p>

Life cycle services

UNIREC H2 technical and maintenance support is available 24/7 thanks to our ABB Global and local service centers.