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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 BW 151

    Braking resistor, max. continous power: 300 W

    BW 156
    • Resistance values: 1,1 - 2000 Ohm
    • Continuous power: 50 - 300 W
    • max. operating voltage: 900 V

    The braking resistor BW 151 is short-circuit proof and has a very good heat dissipation. Braking resitors of REO protect the machine from a voltage rise in the intermediate circuit. They are available as a braking resistor (BW Series) or as a charging resistor  (Series R).


    Typical Applications: 



    • Drive Technology

    • Wind power, solar energies

    • Railway engineering

    • Electromobility


     


    Available as UL version


    The profile resistors REOhm 151 are also UL-certified and have a power of 50 W up to 30 W (also as combination).


    Maximum energy with minimum space



    • In case of failure of resistor, this will become highly resistive.

    • Suitable for IP20 - IP54 applications

    • Test voltage: 2,5 kV AC (at 900 V rated voltage)



    Optional



    • With temperature switch

    • Cover for protection against high surface temperatures



  • REOhm series 153 (UL)

    Max. continous power: 360 W

    BW 156
    • Resistance values: 0,26 - 2000 Ohm
    • Continuous power: 100 - 400 W
    • max. operating voltage: 900 V

    The BW 153 braking is designed  for drives with frequency converters of small to medium output. The installation is close to the frequency converter. 
    In addition to the high protection class IP66, the profile resistors REOhm 153 are also UL-certified and have a power of 100 W up to 400 W (also as combination).


     Maximum energy with minimum space



    • Unity-version can be assembled as low-profile and upright

    • Suitable for IP 65 applications

    • The REO flat resistor can be screwed under or on
      the side of a frequency drive using a mounting plate

    • In case of failure of resistor, this will become highly resistive

    • Test voltage: 2,5 kV AC (at 900 V rated voltage)



    Optional



    • With temperature switch

    • Cover for protection against high surface temperatures



  • REOhm series 156 (UL)

    Max. continous power: 1.500 W

    BW 156
    • Resistance values: 0,3 - 2000 Ohm
    • Continuous power: 400 - 7500 W
    • max. operating voltage: 900 V

    The BW 156 braking is designed for drives with frequency converters of small to medium output. Installation in and outside the control cabinet is possible.
    In addition to the high protection class IP66, the profile resistors REOHM 156 are also UL-certified and have a power of 50 W up to 7.500 W (as combination).


     


    Optional



    • With temperature switch

    • Cover for protection against high surface temperatures



  • 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


     


     

  • REOHM BW 152

    Braking resistor, max. continous power: 330 W

    BW 156
    • Resistance values: 3 - 620 Ohm
    • Continuous power: 120 - 330 W
    • max. operating voltage: 900 V

    The braking resistor of the series REOHM 152 are mounted close to the frequency converter and they are designed for drives with frequency converters of small to medium output. The Series 152 is available as a braking resistor (BW Series) or as a charging resistor (Series R).


    Typical Applications: 



    • Drive Technology

    • Renewable energy


      


    Maximum energy with minimum space



    • This unit is very compact with high power

    • In case of failure of resistor, this will become highly resistive.

    • Suitable for IP20-IP54 applications

    • Test voltage: 2,5 kV AC (at 900 V rated voltage)



    Optional



    • With temperature switch

    • Cover for protection against high surface temperatures



  • REOhm series 153

    Max. continous power: 360 W

    BW 156
    • Resistance values: 7 - 620 Ohm
    • Continuous power: 160 - 360 W
    • max. operating voltage: 900 V

    As BW (Braking resistor)


    When an electric machine operates as a generator (Electromotive brake), the braking resistor protects the machine from a voltage rise in the intermediate circuit. The current reduces als the speed of the machine. 


    As R (Charging resistor, damping resistor, filter resistance, etc.)


    The charging resistor is a current limiting resistor for the charging and discharging of capacitors and limitates for example the current flowing into the intermediate circuit capacitor inrush current. For this 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, so wirewound resistors are the right choice.


    As UL version


    In addition to the high protection class IP66, the profile resistors REOhm 153 are also UL-certified and have a power of 100 W up to 400 W (also as combination).


     


    Maximum energy with minimum space



    • Unity-version can be assem-bled as low-profile and upright

    • Suitable for IP 65 applications

    • The REO flat resistor can be screwed under or on
      the side of a frequency drive using a mounting plate

    • In case of failure of resistor, this will become highly resistive

    • Test voltage: 2,5 kV AC (at 900 V rated voltage)



    Optional



    • With temperature switch

    • Cover for protection against high surface temperatures



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