Rail Technology Resistors
Efficient cooling especially for heavy-duty applications
REO NTT Resistors are specifically developed, produced, and certified for rail and heavy-duty applications. REO Resistors, in air-cooled or water-cooled versions, are used in various functions in rail technology, e.g., as damping resistors or charging/discharging resistors. Due to their area of application, these resistors are subject to special requirements. Maximum functional reliability and service life, coupled with extreme resistance to adverse environmental influences, are therefore absolutely essential. The specially developed winding technology allows for higher dielectric strength due to the spatial separation of the wires used. Thanks to the profile design, protection classes up to IP66 can be achieved. The modular design ensures higher performance can be achieved by combining several resistors. REO liquid-cooled resistors are available with power ratings up to 60 kW, making them significantly smaller than conventional air-cooled resistors.
Advantages of resistors
- High mechanical protection
- Low noise
- Air or liquid cooled
- High functional reliability and long service life
- Protection classes from IP00 to IP66
- Vibration and shock tested according to DIN EN 61373
- Combinable
Performance range of REO resistors
Air-cooled Resistors*
| Type | NTT R 153, NTT R 159 |
| Continuous power | Up to 30 [kW] |
| Nominal voltage | Up to 4.200 [V] |
| Protection class | Up to IP66 |
Water-cooled Resistors*
| Type | BW D 330, NTT RD 158 |
| Continuous power | Up to 60 [kW] |
| Nominal voltage | Up to 4.200 [V] |
| Protection class | IP20 - IP65 |
*The development of components based on customer specifications is a matter of course for us.
REOhm-Charging resistor-NTT-R-153
REOhm-Damping resistor-NTT-R-159
REOhm-Damping resistor-NTT-RD-158