Water-cooled resistors

Liquid cooled REOHM braking resistors

Liquid cooling is a very efficient option that can reduce construction sizes by up to 80%

Liquid cooled resistors from REO are available with capacities from 1 to 100 kW. Cooling channels incorporated into the heat sink enable efficient cooling and the spatial separation of the current-carrying and liquid-carrying pipes – safe usage is guaranteed as a result
Additional advantages:
- efficient and quiet
- high power density
- in the case of very high ambient temperatures the resistors remain cooler than the surroundings
- a very low surface temperature is possible

  • 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




  • 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


Downloads

  • Download
    Resistors Product catalogue
    pdf

    Resistors Product catalogue

    Product catalogue for Resistors
    Download
  • Download
    Liquid cooled systems catalog
    pdf

    Liquid cooled systems catalog

    Product catalog for liquid cooled systems
    Download
  • Download
    Components for wind power generation Catalouge
    pdf

    Components for wind power generation Catalouge

    REO components for wind power generation Safe application for onshore and offshore installations
    Download
  • Download
    Braking resistors Overview
    pdf

    Braking resistors Overview

    REO Braking- and charging resistors The product range at a glance
    Download
  • Download
    Liquid-cooled components
    pdf

    Liquid-cooled components

    Liquid-cooled components The product range at a glance
    Download
  • Download
    Highest protection classes for highest requirements
    pdf

    Highest protection classes for highest requirements

    REO Braking resistors
    Download
  • Download
    REO Braking Resistor NTT BW D330/480000
    pdf

    REO Braking Resistor NTT BW D330/480000

    Water-cooled resistor with supporting frame
    Download
  • Download
    REOLOAD 300
    pdf

    REOLOAD 300

    Water cooled load bank
    Download
  • Download
    REOHM BW D 330
    pdf

    REOHM BW D 330

    High efficiency in a small design
    Download