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Resistor Reohm Series D 330

Watercooled, max. continuous power: 60.000 W


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 its very high performance even in confined spaces, the BWD 330 is ideal for 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 high single pulse energy and nominal voltage. The inductance of the resistor contributes to limiting the inrush current, so wire wound resistors are the right choice.


  • 88% space saving
  • Drip-free quick fasteners
  • Liquid cooling
  • Low weight
  • Low surface temperature

The resistance values refer to standard products with a standard tolerance of +/- 10 % with an ambient temperature of 20 °C. The resistance value insignificantly changes in the function of the winding temperature. Therefore, resistance changes of approx. +10 % in comparison to the cooled-down conditions may occur.