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High Voltage Resistors

High voltage resistors from REO

Resistors that withstand high voltages and high temperatures

High voltage resistors are subject to particular requirements as a result of their areas of application.
The highest level of functional safety and service life paired with an extreme level of robustness against adverse environmental pressures are as a result absolutely essential.


REO high voltage resistors undergo the following tests:
• Climatic fluctuation testing
• Vibration and shock testing, simulated service life testing
• Self-heating measurement
• High voltage testing
• Insulation measurement

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  • REOHM series 155

    Max. continous power: 3.000 W

    BW 156
    • Resistance values: 0,5 - 1440 Ohm
    • Continuous power: 500 - 3500 W
    • max. operating voltage: 900 - 4200 V

    Braking resistor for drives with frequency converters of medium to high power.
    Mounting inside and outside the control cabinet is possible.



    • degree of protection: IP20 / IP65 / IP66

    • test voltage: 2.5 kV AC

    • ambient temperature: 10+40 ºC

    • other services on request

    • other fastenings on request

  • REOHM series NTT R D 158

    Max. continous power: 2600 W

    BW 156
    • Resistance values: 0,1 - 1 Ohm
    • Continuous power: 100 - 1210 W
    • max. operating voltage: 4200 V

    The resistor NTT RD 158 is a water-cooled damping resistor, which is used for traction in railway applications. The resistor is used in series with filter capacitors in the 1.5 kV and 3 kV DC network. 


    For this purpose, the device must be designed for a high single pulse energy and nominal voltage. The inductance of the resistor contributes to limit the inrush current - here are wirewound resistors the right choice.


    The advantage of the resistance unit NTT R D158 is that 4 damping resistors are housed in one unit. This means a compact construction and low cost when connecting the resistor.


    REO high-voltage resistors are designed, produced and certified specifically for the railway technology. The specially designed winding technology allows a higher withstand voltage due to the spatial separation of the wires. The use of railway-compatible, high quality materials, together with the complete encapsulation in profile design lead to protection classes up to IP 65.


    Maximum energy with minimum space



    • Continuous output: 2600 W

    • Max. operating voltage: 4200V

    • Resistance value: 0,1 - 1Ohm

    • Average pulse load: 1x per hour 20kWs - within 100ms

    • Maximum pulse load: 20x per year 120kWs -within 20ms

    • Protection class: IP00-IP65

    • Other ratings upon request