Load and discharge resistors

The current limiting resistor for your capacitor

The charging resistor is a current limiting resistor for the loading and discharge of capacitors and limits for example the in-rush current that flows into the intermediate circuit capacitor.

The device must be laid out for a high level of single pulse energy and nominal voltage for this purpose. The inductance of the resistor also contributes to the limiting of the in-rush current, for this reason REO wire resistors are the correct choice.

  • REOHM R 151

    Load- and discharge 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 charging resistor R 151 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.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 R 152

    Load- and discharge resistor, max. continous power: 330 W

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

    The load and discharge resistors of REO are used to damp over-voltages or to dissipate excess energy that originates, for example, on braking or starting up. Typical areas of application are the use as a resistor for charging the intermediate circuit capacitance, as a braking- or load resistor. 


    Typical Applications: 



    • Drive Technology

    • Renewable energy

    • Railway engineering


      


    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



  • REOHM series 154

    Max. continous power: 200 W

    BW 156
    • Resistance values: 2,2 - 500 Ohm
    • Continuous power: 50 - 200 W
    • max. operating voltage: 900 V

    The braking resistor REOHM 154 protects the machine from a voltage rise in the intermediate circuit, if an electric machine operates as a generator (Electromotive brake). The current reduces also the speed of the machine. 


    The serie REOHM 154 is available as braking resistor (series BW) or as charging resistor (series R).


    As 154 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.


    Typical Applications: 



    • Drive Technology

    • Renewable energy

    • Electromobility


     


    Maximum energy with minimum space



    • The compact design enables the use in all applications where
      little space is available (for example in cabinet and frequency converter)

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

    • In case of failure of resistor, this will become highly resis-tive

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



    Optional



    • With temperature switch

    • Cover for protection against high surface temperatures



  • REOHM series 155

    Max. continous power: 3.000 W

    BW 156
    • Resistance values: 0,5 - 1440 Ohm
    • Continuous power: 500 - 3000 W
    • max. operating voltage: 900 - 4200 V

    Due to their high protection class up to IP66, the resistors of the REOHM 155 series are particularly suitable for aggressive environments.Better heat dissipation and better dynamic behaviour of the resistors have been achieved by filling heat conducting material surrounding the wound body. The resistors of the series 155 are available as braking resistors, charging resistors or high-voltage resistors. 


    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 high-voltage resistors


    REO high-voltage resistors are designed, produced and certified especifically 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 and high quality materials, together with the complete encapsulation in profile design allows protection ratings up to IP66. 


    Maximum energy with minimum space



    • This unit is very compact with high power

    • Suitable for IP 65 applications

    • Capacity can be doubled by fan that is provided with screw thread

    • In case of failure of resistor, this will become highly re-sistive

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



    Optional



    • With temperature switch

    • Cover for protection against high surface temperatures

  • 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



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