ENGINEERED FOR ROLLING STOCK — PREMIUM PSU’S RAILWAY POWER PORTFOLIO AT INNOTRANS 2026
This is a technical tour of the converters, inverters, drives and chargers on the stand — and the rolling-stock applications they are built for.
Founded in Barcelona in 1981, Premium PSU brings more than four decades of power-conversion experience and over 900 custom designs to InnoTrans 2026.
One Supplier, the Full Conversion Matrix
Premium PSU designs and manufactures the complete conversion matrix used on board a modern train — AC/DC power supplies, DC/DC converters, DC/AC inverters, AC/AC variable frequency drives and UPS — from 50 W to 72 kW. Every railway product is engineered to EN 50155, with fire-and-smoke behaviour to EN 45545-2, shock and vibration to EN 61373 and the EMC performance the onboard environment demands. Sourcing the whole matrix from one qualified supplier removes multi-vendor qualification overhead and the grey areas of responsibility that appear when converters from different makers share the same bus.
Spotlight — VDX-6K
The product Premium PSU is putting front and centre at InnoTrans 2026 is the VDX-6K: a railway-grade AC/AC three-phase frequency converter developed for multi speed HVAC condenser-fan control on high-speed trains and small compressors. It acts as a controlled interface between a train-side 400 VAC three-phase supply and the HVAC rotating loads, livering a selectable sinusoidal output from 320 to 480 VAC and 40 to 60 Hz, where a standard industrial drive would not fit either mechanically or electrically.
Fan operation is managed through simple discrete hardware inputs, selecting the required V/F operating point — reduced, nominal or high speed — while relay outputs report input, output and temperature status back to the HVAC controller. An RS-232 interface remains available for parameter setting, monitoring and maintenance. Because normal operation can be handled through hardware signals rather than continuous network communication, the VDX-6K reduces system integration complexity and limits unnecessary communication exposure.
Engineered for railway rolling stock applications according to EN 61287-1 and EN 50155, the VDX-6K combines 6.4 kW nominal power, 11.6 kW peak power, IP54 protection, EN 61373 shock and vibration compliance, and EN 45545-2 fire and smoke compliance in a compact closed-case format.
Catenary-Fed Power — The Spark Series
The Spark Series takes power straight from the catenary. The OVX-6400 is a 6.4 kVA three-phase pure sine wave DC/AC inverter that supplies a stable 400 VAC auxiliary line directly from a 600/750 VDC catenary, while the CVS-280 is a compact DC/DC converter used as a low-battery-voltage starter. Both remove intermediate conversion stages, saving space and losses on vehicles where the catenary is the only primary source.
Isolated DC/DC — The CRS and CLS Families
Premium PSU offers two complementary railway DC/DC converter platforms for different system architectures.
The CRS family is designed for higher-power chassis-mount applications where the input and output voltages are selected according to the train architecture. CRS can therefore support application-specific DC/DC voltage combinations, such as converting from one battery voltage to another auxiliary DC bus, while offering higher power levels, robust mechanical integration, redundancy or parallel operation, hold-up capability, active reverse-polarity protection and different cooling options depending on the model.
The CLS family covers railway battery applications from 40 W to 500 W with regulated 24 VDC output as standard, plus 12, 15 and 110 V variants. Models up to 300 W use an ultra-wide 11:1 input range (16.8–137.5 V), covering all nominal battery voltages — 24, 36, 48, 72 and 110 V DC — in a single reference. The CLS-500 targets 72/110 V systems with a 4:1 extra-wide range (50.4–137.5 V). Across the family, this reduces the number of variants needed for qualification, stock and spares management in mixed fleets..
In short, CRS is the higher-power platform for application-specific input/output voltage combinations; CLS is the wide-input platform for regulated 24 VDC or 110 VDC auxiliary outputs.
Auxiliary AC — TDS-3300 and the SiC HVAC Roadmap
The TDS/TDX AC Master series is an isolated AC/AC voltage and frequency changer that can also operate from a high-voltage DC input as a DC/AC inverter. The TDS version provides a regulated 230 VAC single-phase output, while the TDX version provides a regulated 400 VAC three-phase output, both with sinusoidal waveform and adjustable frequency capability. This makes the platform suitable for railway auxiliary AC supply and hotel-load applications
Energy and Hybrid Traction — BDS-10K
For battery-electric and hybrid platforms, the BDS-10K is a scalable battery charger that can be paralleled — up to four units for 40 kW — and is qualified to EN 50155. It supports the charging and energy-management needs of BEMU and hybrid diesel-electric trains, where reliable DC energy is as critical as traction itself.
Designed, Built and Tested in Barcelona — by a Team of Experts
What ties the portfolio together is process. Premium PSU’s engineering, test laboratory and production are co-located in Barcelona, so the loop between specification, qualification and manufacturing never crosses time zones or supply chains. A dedicated team of power-electronics experts works from a quantified mission profile through a Design-for-Reliability flow, delivering custom prototypes in as little as 14 weeks — about half the typical industry cycle — and backing every unit with 100% final test. With more than 900 custom designs since 1981, the team’s know-how keeps NRE costs and schedules low while meeting the most demanding rolling-stock requirements.
Meet Our Experts at InnoTrans 2026
Premium PSU’s DACH Export Area Manager and Product Manager presenting the VDX-6K IP54 and CLS railway DC/DC series ahead of InnoTrans 2026.
Premium PSU will present this full portfolio at InnoTrans 2026 — Berlin, 22–25 September, Hall 17, Stand 425. Our engineering team will be on the stand to discuss specific operating profiles, qualification requirements and custom developments. The most useful conversation does not start with a datasheet — it starts with your application, your operating profile and your timeline. Book a meeting with our experts in advance. Contact us!
About Premium PSU
Founded in Barcelona in 1981, Premium PSU has more than four decades of power-conversion experience and over 900 custom designs. Engineering, test laboratory and production are co-located in Barcelona, covering the full railway conversion matrix from 50 W to 72 kW.
Born in Barcelona, Powering the World — www.premiumpsu.com
