RECOM is announcing two new cost-efficient DC/DCs for the rail market with an ultra-wide 11:1 input range to cover all nominal input voltages from 24V to 110VDC, with 24V output and a 12 and 15V output version coming soon. Models RMD40-UW and RMD75-UW have trimmable outputs with reinforced isolation, rated at 40W (60W/10s boost) and 75W (90W/10s boost) respectively. The parts are offered as lightweight baseplate-cooled modules and thanks to their high conversion efficiency of better than 90%, they can operate at full power for OT4+ST1&ST2 classes from -40°C to +85°C with no additional cooling in any mounting position.
A wealth of features are 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 authorised distributors or directly from RECOM.
