MEN Mikro Elektronik has launched two power supply units, the PU20 DC unit and the PU21 AC unit, for reliable computer power sourcing required in onboard or wayside railway applications, as well as other harsh environment applications. The redundant power monitoring and inverse current protection offered by these units aim to secure a constant output of power in hazardous environments.

Designed with conformal coated electronics and a robust H15 rear connector, these new units are protected from both moisture and vibration. Both the PU20 and PU21 offer high functional reliability. Should power be lost for any reason, voltage is evenly distributed to the remaining working units, ensuring a consistent and constant current power output.

Developed according to EN 50155, both units are able to accommodate different voltage inputs on trains as well as on the tracks. The PU20 automatically detects input voltage for 24VDC, 72VDC and 110VDC and can be manually configured for 36VDC, 48VDC, 74VDC and 96VDC. The PU21 offers a wide input voltage range from 100VAC to 240VAC.
Output power for each unit is 125W at the standard output voltage of 5V, while standby power is 5W at 5V, allowing users to start the power supply units with a wireless connection. An integrated microcontroller monitors the ports, voltage and temperature to ensure safety.

These pluggable power supplies are offered in single Eurocard format (3U) and are designed for use in 19in systems such as CompactPCI, CompactPCI Serial and VMEbus, and need only 6HP at the front. They have an extended operating temperature of -40°C to +85°C.

Equipped for SIL applications, these new fail-safe units are also certified to S-9401.

Main Features

  • 3U, 6HP and 19in rack mountable
  • Output power: 120W without derating
  • Active power sharing
  • Prepared for SIL applications
  • -40°C to +85°C operation
  • Inverse current protection
  • Redundant output voltage monitoring
  • Conformal coating against dust and humidity
  • Fully EN 50155 and S-9401 compliant

For more information, please contact MEN Mikro Electronic.