Brake Resistors

The SXLG high-performance braking resistors are ideal for use in drive systems with frequency inverters to dissipate the kinetic energy contained in the system during braking. Since a large amount of regenerative energy is converted into thermal energy in braking resistors during braking operation, high load capacity and long service life are important. The power consumption can be increased as required by variable series and parallel connection.

When selecting the brake chopper or braking resistor, it is important to bear in mind that gearless systems feed back much more energy than geared systems. As a result, it is possible that twice as much energy is fed back for the same size of frequency inverter.

When converting a system, it is absolutely necessary to calculate the braking chopper or braking resistor design. The braking resistors of the SXLG series score with a robust aluminum housing and easy installation. The high load resistors SHPA have a low temperature rise due to a heat conducting housing.

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  1. Aluminium Enclosure Resistor 60 W
    Aluminium Enclosure Resistor SXLG 120 W, 750 Ohm
    €41.00
    • Resistance: 750 Ω / 120W
    • Power: 0,75KW
    • Operating voltage range: up to 400V
    • IP Grade: IP00/IP33
    • Weather resistant and vibration resistant
    • Easy insatallation
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  2. Aluminium Enclosure Resistor 60 W
    Aluminium Enclosure Resistor SXLG 300 W, 400 Ohm
    €41.00
    • Resistance: 400 Ω
    • Power: 300W
    • Operating voltage range: up to 400V
    • IP Grade: IP00/IP33
    • Weather resistant and vibration resistant
    • Easy insatallation
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  3. Aluminium Enclosure Resistor 60 W
    Aluminium Enclosure Resistor SXLG 300 W, 250 Ohm
    €41.00
    • Resistance Range: 250Ω
    • Power: 300W
    • Operating voltage range: up to 400V
    • IP Grade: IP00/IP33
    • Weather resistant and vibration resistant
    • Easy insatallation
    Learn More
  4. Aluminium Enclosure Resistor 60 W
    Aluminium Enclosure Resistor SXLG 500 W, 150 Ohm
    €41.00
    • Resistance: 150 Ω
    • Power: 500W
    • Operating voltage range: up to 400V
    • IP Grade: IP00/IP33
    • Weather resistant and vibration resistant
    • Easy insatallation
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  5. Aluminiumgehäuse Widerstand 60W
    Aluminium Enclosure Resistor SXLG 500 W, 100 Ohm
    €42.00
    • Resistance Range: 100Ω
    • Power: 500W
    • Operating voltage range: up to 400V
    • IP Grade: IP00/IP33
    • Weather resistant and vibration resistant
    • Easy insatallation
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  6. Aluminium Enclosure Resistor 500 W
    Aluminium Enclosure Resistor SXLG 800 W 75 Ohm
    €42.00
    • Resistance: 75 Ω
    • Power: 800W
    • Operating voltage range: up to 400V
    • IP Grade: IP00/IP33
    • Weather resistant and vibration resistant
    • Easy insatallation
    Learn More
  7. Aluminium Enclosure Resistor 500 W
    Aluminium Enclosure Resistor SXLG 1000 W, 50 Ohm
    €56.00
    • Resistance Range: 50 Ω
    • Power: 1000W
    • Operating voltage range: up to 400V
    • IP Grade: IP00/IP33
    • Weather resistant and vibration resistant
    • Easy insatallation
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  8. Aluminium Enclosure Resistor 1000 W
    Aluminium Enclosure Resistor SXLG 1500W, 40 Ohm
    €65.00
    • Resistance: 40 Ω
    • Power: 1500W
    • Operating voltage range: up to 400V
    • IP Grade: IP00/IP33
    • Weather resistant and vibration resistant
    • Easy insatallation
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  9. Aluminium Enclosure Resistor 1500 W
    Aluminium Enclosure Resistor SXLG 2000 W, 25 Ohm
    €71.00
    • Resistance: 25 Ω
    • Power: 2000W
    • Operating voltage range: up to 400V
    • IP Grade: IP00/IP33
    • Weather resistant and vibration resistant
    • Easy insatallation
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  10. Braking resistor SBRU 2.4 kW 25 Ohm
    Braking resistor SBRU 2.4 kW 25 Ohm
    €189.00
    • Power: 2.4 KW
    • Resistance: 25 Ohm
    • Max. current carrying capacity: 80A
    • Voltage: <800V
    • Temperature contact
    • terminal: M6
    • dimensions (W/H/D): 251/500/117 mm
    • Weight: 7.3kg
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  11. BRU-6.0
    Braking resistor SBRU 6.0 kW 20 Ohm
    €285.00
    • Power: 6.0 KW
    • Resistance: 20 Ohm
    • Max. current carrying capacity: 80A
    • Voltage: <800V
    • Temperature contact
    • terminal: M6
    • dimensions (W/H/D): 341/600/142 mm
    • Weight: 12.5kg
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  12. Braking resistor SBRU 10 kW 20 Ohm
    Braking resistor SBRU 10 kW 20 Ohm
    €385.00
    • Power: 10.0 KW
    • Resistance: 20 Ohm
    • Max. current carrying capacity: 80A
    • Voltage: <800V
    • Temperature contact
    • terminal: M6
    • dimensions (W/H/D): 410.5/685/142mm
    • Weight: 17.2kg
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  13. Braking resistor SBRU 10 kW 14 Ohm
    Braking resistor SBRU 10 kW 14 Ohm
    €385.00
    • Power: 10.0 KW
    • Resistance: 14 Ohm
    • Max. current carrying capacity: 80A
    • Voltage: <800V
    • Temperature contact
    • terminal: M6
    • dimensions (W/H/D): 410.5/685/142mm
    • Weight: 17.2kg
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Starting Resistors

The use of mounted starting resistors is quite similar. Here the brake resistors may be attached to the roof, resulting in the heat being dissipated; which provides sufficient cooling. In some types of locomotives the same results are achieved by fixing the starting resistors in the passenger compartments. Primarily used as brake resistors they are also used for temperature control in the winter, to keep the compartments warm. Modern vehicles combine the use of the braking resistors with a heat exchanger, which has the advantage that temperature regulation is not affected by the operation of the brakes.

Frequency Inverter and Brake Resistor

There has been research carried out over a long period of time to improve the braking resistors in order to achieve better results. For this reason frequency inverters and power settings are mostly used nowadays. The first one enables the conversion of current and the second one can be regulated to produce the maximum amount of power. This is achieved through the use of a thyristor. A better control of the current strength is achieved when the fluctuations in the mains supply are removed. During subsequent braking, power can be fed back into the mains supply. Resistors also feature in electromotive braking. They provide a considerable advantage as they allow safe breaking, even when there are connection problems with the mains network. The brake resistors work properly, but only under certain conditions. Primarily there is a need for constant cool air. In addition, the heated air must be able to vent freely. Also, when the ambient temperature reaches 40°C or more, it needs to be cooled. These criteria need to be maintained in all cases to avoid damage to the braking resistors and other components which may occur. To summarise, the brake resistor can be said to be making a major contribution to the smooth operation of machinery.

Brake Resistor Power

Calculation based on a 55 kW inverter:P = Q * Kc = 55 kW * 20% = 11 kWQ = motor powerKc = the ratio of energy recovery during engine operation (depending on load)

Centrifuge 05%-20%
Lifts 10%-15%
Cranes (<100m) 20%-40%
Oil Field Pumps 10%-20%
Other 10%

Resistance Value

R = 2 * U / I = 2 * 670 V / 110 A = 12 ohmsU = operating voltage during brake application (DC link voltage)I = operatin current during brake application