RECOM has introduced two new cost-effective DC/DC converters designed for the railway sector, featuring an ultra-wide 11:1 input range that accommodates all nominal voltages from 24 V to 110 VDC. The initial release offers a 24 V output, with 12 V and 15 V versions planned for the near future. The RMD40-UW and RMD75-UW models provide trimmable outputs and reinforced isolation, delivering 40 W (with a 10-second boost to 60 W) and 75 W (with a 10-second boost to 90 W), respectively. These lightweight, baseplate-cooled modules achieve over 90% conversion efficiency, allowing them to run at full power in OT4+ST1&ST2 conditions across a temperature range of -40 °C to +85 °C without the need for extra cooling, regardless of mounting orientation.
A wealth of features is incorporated as standard, including EN50121-3-2 filtering and disturbance protection, input reverse polarity protection, inrush current limiting, remote on/off, power-good signal/contacts, output trim and internal OR-ing diode for paralleling/redundant operation. An active hold-up circuit provides ≥10ms ride-through across the whole input range. Comprehensive protection is included against short circuits, over-current, over-temperature and over-voltage. Along with comprehensive EN50155 certification and approvals for rail applications, these features make for easy ‘plug and play’ system integration with ‘fit and forget’ confidence from a high MTBF figure and 20-year design lifetime/useful life class L4.
The RMD40-UW is presented in a compact 100 x 60 x 30mm package, while the RMD75-UW is just 110 x 73 x 40mm. Connections are by block terminals or optionally by Cage Clamp terminals as suffix /PT, and a DIN-rail mounting option is available for both versions. The units come with aluminium housing in IP20, the electronic part is conformally coated for OV2/PD2 environment, and both families fulfil EN45545-2 – HL3 fire protection hazard level.
“These DC/DCs require no extra components and no external circuits for compliance with all of the relevant railway EMC, safety, environmental and fire protection standards, making them a cost-effective, compact and straightforward solution for auxiliary systems that need an isolated 24V bus” comments Marco Kuhn, Product Manager DC/DC Plug & Play of RECOM
Parts include a two-year warranty. Samples and OEM pricing are available from all authorized distributors or directly from RECOM.
