Braking resistors

Not all braking resistors are the same -

REOhm is the answer for modern inverter technology

When an electric motor works as a generator (electromotive brake), the braking resistor protects the machine from a voltage rise in the DC link. At the same time, the reduction of current leads to a speed reduction of the engine and helps to brake the machine.

REO braking resistors achieve a better heat dissipation and better dynamic behaviour by filling heat conducting material surrounding the wound body. 
REO resistors are short-circuit proof and self-extinguishing. They guarantee a high level of operational safety and are overload-proof in case of short-term loads for your applications (e.g. wind power engineering, railway engineering and automotive engineering).

  • 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


  • REOhm series R 157

    Max. continous power: 300 W

    BW 156
    • Resistance values: 20 - 8000 Ohm
    • Continuous power: 150 - 300 W
    • max. operating voltage: 4200 V

    High voltage resistor for drives with frequency converters of small to medium output, installation close to the frequency converter. They are used to damp over-voltages or to dissipate excess energy that originates, for example, on braking or starting up. This is done by converting the electrical energy into heat in the resistor. 


    Due to their special application, these resistors are are subject to special requirements. Highest reliability and durability combined with an extreme resistance to adverse environmental impacts are therefore absolutely necessary.


     



    • Protection ratings IP 20 / IP 40 / IP 54

    • Higher IP ratings upon request

    • Test voltage: 10,5 kV DC und 8,3 kV AC

    • Other ratings and fastening dimensions upon request


     


     

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