RWY259 250W-300W

DC/DC Converter Railway Applications

This fully encapsulated, rugged, railway quality DC/DC converter uses field-proven technology to generate between 250 ~ 300W, depending on the input/output combination required. It is a mature design with a track record in numerous applications. The unit is entirely potted with a thermally conductive MILgrade silicon rubber compound to ensure immunity to shock, vibration and humidity.

It is conduction-cooled via a base plate to a heatsinking surface. Low component count, large design headrooms, and the use of components with established reliability result in a high MTBF. The unit meets the requirements of EN50155 for electronic equipment used on rolling stock.

Rugged Mechanical Designs

Helios power supplies are ruggedly constructed and can be customized for specific mechanical requirements. Standard mechanical packages and ruggedization options include:

  • Chassis and wall-mountable units in vented conduction/convection or fan-cooled enclosures
  • DIN-rail and open-frame format available for many designs
  • Plug-in (Eurocard) format for modular power systems in 19 inch or 23-inch racks
  • Conformal coating and ruggedizing are standard
  • Full encapsulation (potting) in a thermally conductive MIL-grade silicon rubber compound with UL94V-0 flammability rating for immunity to high levels of shock and vibration, humidity, moisture, dust, salt, oil, insects and other contaminants
  • Enclosure in rugged, IP66- or IP67-rated waterproof, dustproof and explosion-proof die-cast aluminium packages. These enclosures also protect internal electronic boards from condensation and the ingress of oil, salt, sand, insects and other environmental contaminants
  • Custom connections
  • Portable DC Power Supplies

SERIES TABLE

Model Standard Outputs Power (W)
RWY259   5V
12V
24V
36V
48V
72V
150W
250W
300W

SPECIFICATIONS TABLE

Operating input voltage range 24VDC   ( 14.4 ~ 34 )
36VDC   ( 22 ~ 51 )
48VDC   ( 20 ~ 67)
72VDC   ( 43 ~ 101)
96VDC   ( 58 ~ 135)
110VDC   ( 66 ~ 154)
Input Protection Reverse polarity protection.Inrush current limiting Lower voltage than specified will not damage unit
Output Voltage See  table
Regulation ±1% Line / Load combined
Operating Temp:  -40ºC to +70ºC cold plate temperature
Efficiency Model dependent , typically 80-90%
Dynamic Response Max ±5% diviation for 10% – 50% load step wuth 1msec recovery
MTBF >150,000 hrs