A technical choice that powers better returns
ABB UNIREC H2 is ABB’s multi-pulse thyristor rectifier, purpose-built for industrial hydrogen production. It combines ABB’s proven thyristor technology with advanced digital control and protection.
The thyristor-based technology enables decades of uninterrupted operation, while its compact design requires less space than previous generations, speeds up delivery time and simplifies maintenance.
Its energy efficiency lowers the life cycle operating costs while its flexibility makes it ideal for megawatt to giga scale projects.
Engineered in compliance with major international electrical, industrial, and safety standards, UNIREC H2 is grid code compliance ready and ensures safe, reliable, and globally deployable operation.
KEY BENEFITS of unirec h2
High efficiency, and built-in protection
<p>Up to 99.6% conversion efficiency, excellent thermal performance, multi-pulse transformer configurations for grid-friendly operation, and comprehensive protection (overcurrent, overvoltage, thermal, DC short circuit).</p>Easy to integrate
<p>Designed as a modular, standardized rectifier system that reduces installation effort, shortens delivery schedules and simplifies integration into electrolyzer-based hydrogen plants.</p>Proven ABB rectifier technology
<p>Built on ABB’s long-established multi-pulse thyristor converter platform, used in thousands of rectifier installations worldwide and delivering stable, precise DC output for mission-critical industrial processes.</p>Compliance with electrical and grid code compliance standards
<p>Engineered to meet major international standards, including IEC 61000, IEC 62271, EN 50160 and IEEE 519, and ensuring safe and compliant operation in all geographies.</p>Built for flexibility
<p>Modular building blocks available in air-cooled (up to ~4.5 kA) and water-cooled (up to ~6 kA) configurations, scalable to ~25kA for large electrolyzer clusters - supporting projects from pilot units to multi-MW installations.</p>Global ABB expertise & lifecycle services
<p>Backed by ABB’s global manufacturing footprint and service network, ensuring expert commissioning, maintenance, spare parts availability and long lifecycle support.</p>Industry applications
ABB UNIREC H2 power rectifier is ideal for Green hydrogen production plants , Industrial-scale electrolyzer systems , Renewable energy-to-hydrogen projects
Green hydrogen production plants, Industrial-scale electrolyzer systems, Renewable energy-to-hydrogen projects
Containerized systems
ABB UNIREC H2 power rectifiers can be deployed as a containerized solution, a complete flexible and scalable solution for hydrogen production plants, even in the most extreme operating conditions.
- Integrate up to six UNIREC H2 systems within a standard-size container[SH8.1][AL8.2]*
- Easy transportation to any location
- Rapid installation and connection
- Seamlessly integration into existing facilities or newly built environments
- Optimize CAPEX by minimizing civil works and avoiding major infrastructure investments
*depending on rectifier configuration.
keep your system performing at its best for decades
Access life cycle services, tools and documentation to improve reliability, speed up troubleshooting and enhance operational insights.
FREQUENTLY ASKED QUESTIONS
UNIREC H₂ is a thyristor-based high-efficiency power rectifier designed to supply stable DC power to industrial electrolyzers for hydrogen production. It supports alkaline, PEM and other electrolyzer technologies.
Thanks to its modular architecture, UNIREC H₂ scales from pilot hydrogen units to multi-megawatt plants, with current blocks up to ~4.5 kA (air-cooled) and ~6 kA (water-cooled), expandable to ~25 kA.
Yes. Standardized modules, flexible cooling options and pre-engineered configurations simplify installation, reduce engineering time and support fast deployment for OEMs, EPCs and plant designers.
Yes. It complies with key industrial and grid standards including IEC 61000-6-1/-3, IEC 62271-1, EN 50160 and IEEE 519, ensuring safe and reliable operation globally.
Customers can choose UNIREC H2 air-cooled units for simpler installations or water-cooled units for higher power density and better thermal management. Water-cooled units deliver up to three times the power in the same footprint.
The need for additional filtering equipment for thyristor-based rectifiers depends on each project specificities. For every project, ABB can perform the equipment study , including active filtering equipment design and supply.
UNIREC H2 power rectifier delivers up to 99.6% conversion efficiency thanks to its simple streamlined design and components