ERN500D High-Efficiency Converter for Railway


A high-efficiency 750VDC input DC/DC converter for light-rail and industrial applications, the ENR500D is based on an enhanced resonant topology providing high efficiency of 95% typical across the low to high load range. Designed for railway applications, the ENR500D fulfills the stringent standard EN 50124-1 and delivers full performance across the temperature range of -40 to +70°C.


PRBX designers have developed the 500 W ENR500D platform that is built on a resonant topology combined with the latest MOSFET technology and the use of high-performance magnetics. The ENR500D is designed to comply with the EN 50124-1 standard and for the so-called Pollution Degree 2 (PD2) such as control cabinets in the driver’s cabin or passenger compartments. With ingress protection to IP20 and input to output double reinforced isolation, the unit complies with EMC emissions and immunity as specified in both EN 50124-1 and EN 50124-5.


The ENR500D has a nominal input voltage of 750V DC and operates within a range of 500 to 900V DC. The nominal output voltage is set to 48V DC, though it can be adjusted up to 60V DC. Nominal output power is 500 W constant across the temperature range of -40 to +70°C in natural cooling conditions. The enhanced topology confers to the ENR500D a high efficiency of up to 95% from 20 to 100% load conditions. Designed to reduce systems energy consumption, at no load the ENR500D input power is less than 5 W.


In accordance with EN50124-1, rated impulse voltage of 4.4kV, the input to output has a double reinforced insulation of 1,000V, with a clearance of 8.0 mm, creepage ISO Class I and 10.0 mm, ISO Class II 14.2 mm. It measures 163 x 230 x 80 mm and has an ingress protection level of IP20. For reliability and availability, all printed circuit boards have a protective coating. The ENR500D can be modified to offer other output voltages such as 12V, 24V or any other required by the system designer. Different output powers can also be provided in optimized mechanical formats.


  • 750V DC input
  • Emission and immunity in accordance with EN 50124-1 and EN 50124-5
  • 48V DC output
  • High efficiency, 95%
  • Reliable design
  • Designed for railway applications
  • Suitable for industrial application powered from rectified 400V AC
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