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 155 - Combination

    Max. continous power: 30.000 W

    BW 156
    • Resistance values: 0,8 - 820 Ohm
    • Continuous power: 4000 - 30000 W
    • max. operating voltage: 900 V

    As BW (Braking resistor)


    When an electric machine operates as a generator (Electromotive brake), the brake 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.


     


    Maximum energy with minimum space



    • This braking resistor of the REOHM series is very compact with high capacity

    • Maximum energy is provided in smallest space and very high protection rating

    • The resistor is to be as-sembled vertically with the terminal box at the bottom

    • Sufficient convection is to be ensured

    • Ratings higher than 22kW require a separate terminal box

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

    • Ambient temperature: -10...+40°C

    • Max. temperature: >300°C



    Optional



    • With temperature switch

    • Cover for protection against high surface temperatures



  • REOHM series 156

    Max. continous power: 1.500 W

    BW 156
    • Resistance values: 1 - 1000 Ohm
    • Continuous power: 400 - 1500 W
    • max. operating voltage: 1000 V

    Resistances of REOHM Series 156 are characterized by their high power density with a small mounting area. Due to their high degree of protection up to IP66  they can be used even in particularly aggressive environmental conditions  (eg salt spray). The resistors are available as braking resistors , charge-, attenuation,- and filter resistors or as UL version.


    As BW (Braking resistor)


    When an electric machine operates as a generator (Electromotive brake), the brake 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 156 are also UL-certified and have a power of 50W up to 7.500 W (as combination).


     


    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 IP 66 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 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 BW 601 / 602

    Max. continous power: 30.000 W

    REOHM Series BW 601 / 602
    • Resistance values: 0,09 - 660 Ohm
    • Continuous power: 1000 - 30000 W
    • max. operating voltage: 1000 V

    As BW (Braking resistor)


    When an electric machine operates as a generator (Electromotive brake), the brake 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.


     


    Maximum energy with minimum space



    • Protection ratings: IP 20 up to IP 22

    • Test voltage: 3.5 kV

    • Max. temp.: 300°C

    • Ambient temperature: -10 to +40ºC

    • Resistance values according to E6

    • Other ratings upon request



    Optional



    • Connecting wires

    • Low-induction winding 



  • REOHM series D 158

    Max. continous power: 60.000 W

    BW 156
    • Resistance values: 2 - 850 Ohm
    • Continuous power: 1000 - 60000 W
    • max. operating voltage: 1000 V

    The series D 158 can be used as braking or load resistor for drive technology, industrial applications, test fields, E-Mobility and railway engineering with integrated water cooling. Thanks to localised, optimised cooling, high outputs can be generated in the smallest space with low heat generation. It is also possible to deploy it in areas with high ambient temperatures.


    The resistors are available as braking-, load-, or highvolt resistors.


    Applications:



    • Drive technology, frequency converters

    • Railway

    • E-Mobility

    • Test systems


     


    Maximum energy with minimum space



    • Protection IP20 up to IP66

    • Test voltage 2,5 kV AC

    • Ambient temperature: -15 to +80ºC

    • Other fixing points or power ratings on request



    Optional



    • With temperature switch


     

  • REOHM series D 330

    Watercooled, max. continous power: 60.000 W

    BW 156
    • Resistance values: 1 - 100 Ohm
    • Continuous power: 15000 - 60000 W
    • max. operating voltage: 800 V

    The REO braking resistor D 330 converts excess braking energy into useful heat and is thus ideally suitable for electrical or hybrid drives.  The water cooling makes an additional space saving of up to 88% possible as compared to a traditional air-cooled braking resistor.  As an extra feature, the resistor can easily be connected with drip-free quick fasteners. Due to a very high performance even in confined spaces the BWD 330 is ideal for the use in wind power technology, too. Harsh environmental conditions, such as salt spray are no problem with the high protection degree up to IP 69K.


    As BW (Braking resistor)


    When an electric machine operates as a generator (Electromotive brake), the brake 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.


    Applications



    • Electrical or hybrid drives

    • Wind power

    • Industrial applications


     


    Maximum energy with minimum space



    • Protection IP20 up to IP69 K

    • Test voltage 2,5 kV AC

    • Other power ratings on request



    Optional



    • With temperature switch




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