The Complete Auxiliary Power Matrix for Rolling Stock – Premium PSU at InnoTrans 2026

From 40W battery DC/DC converters to 10kW variable frequency drives, galvanically isolated and non-isolated AC/AC converters and catenary-fed auxiliaries: Premium PSU designs and manufactures the full range of auxiliary and services power conversion for railway rolling stock, all engineered to EN 50155 and built in Barcelona. InnoTrans 2026, Hall 17, Stand 425 – here is what is on the stand. One Supplier, the Full Conversion Matrix Premium PSU designs and manufactures the complete railway power supply matrix used on board a modern train – AC/DC power supplies, DC/DC converters, DC/AC inverters, AC/AC variable frequency drives and DC-UPS – from 40W to 40kW. 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. The complete range will be on show at InnoTrans 2026, Hall 17, Stand 425. Spotlight – VDX Series Premium PSU’s VDX series are railway variable frequency drives (VFDs) for speed control of rotating loads – HVAC compressors, condenser fans and similar motors – where no galvanic isolation between input and output is required. Both models take a 400VAC three-phase supply and deliver a fully controllable sinusoidal output: any voltage between 60 and 400VAC and any frequency between 5 and 100Hz, with programmable V/F ramp, soft start and phase reversal. RS-232 is available on both models; CAN Bus is available on the VDX-10K. The VDX-6K is the compact IP54 version – 6.4kW nominal, 11.6kW peak for 500ms – designed for exposed installation environments such as rooftop HVAC units. Its hardware inputs select from four preset V/F operating points, though any voltage and frequency within the operating range can be set via RS-232. The VDX-10K is the standard IP20 version at 10kW nominal, and adds CAN Bus alongside RS-232 for integration into vehicle networks using the CANOpen protocol, with node address selectable by dip switch. Both models comply with EN 50155, EN 45545-2 and EN 61373 Category 1 Class B. Catenary-Fed Power – The Spark Series The Spark Series is Premium PSU’s catenary power supply product line – converters designed to take power directly from the 600/750 VDC DC traction supply, eliminating the need for an intermediate AC/DC stage on vehicles where the catenary is the primary source. The OVX-6400 is a 6.4 kVA DC/AC inverter that converts catenary voltage directly to a stable 400 VAC three-phase output – 6 kW nominal, 8 kW peak for 5 seconds – with galvanic isolation rated at 5,200 Vrms and frequency selectable from 50/60 Hz by DIP-switch or freely configurable via RS-232 and CAN Bus. The CVS-280 complements it at the auxiliary DC level: a 280 W DC/DC converter drawing from the same catenary input and delivering regulated 24, 48, 72 or 110 VDC with 7,000 Vac isolation – the highest in the portfolio – and an integrated ORing diode for battery paralleling and redundancy. For higher-power applications, Premium PSU has delivered catenary-fed systems up to 35 kVA + 5 kVA combining two independent three-phase outputs from a single 750 VDC input – an example of the custom development capability available from the same engineering team. Both standard products comply with EN 50155, EN 45545-2 and EN 61373 Category 1 Class B. Isolated DC/DC – The CRS, CTS and CLS Families Premium PSU offers two complementary railway DC/DC converter platforms for different system architectures. The CRS family covers higher-power DC/DC conversion from 180W to 2kW, with galvanic isolation and input voltage options spanning all standard railway battery nominals – 24, 36, 48, 72 and 110VDC. Unlike the CLS, which fixes the output at regulated 24VDC, the CRS/CTS matrix covers both input and output flexibility: output voltages …