Types of resistors

Braking resistors

Braking resistors for trains, electric locomotives, buses, trams, trolleybuses, metro, lifts, conveyors, overhead cranes, cranes

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Braking resistors are the most popular type of high power resistors used in electric motor drives in modern industry. The main applications are found in the transport [railways, aviation, bus industry], construction and maritime industry.

Braking resistor is used when braking electrical machines. Such machines are driven by motors controlled by frequency converters - inverters. This allows for a smooth and dynamic speed change. During dynamic braking this system is working as an electric generator and returns the current to the power network, which is able to accept it up to its specific value. Above this value, the braking energy must be discharged in a different way, and for this purpose a braking resistor is applied, which discharges this energy, converting it into heat.

Most often, the power of such a braking resistor constitutes a small part of the inverter power, due to the fact that it is activated for a short time. In a result the braking resistor powers are relatively small compared to the power of starting resistors.

The manufacturing of resistors in the SIMPAX company is carried out in accordance with the ISO 9001:2015 quality system. For the production of resistors, we use the latest technologies, proprietary construction solutions, modern resistance elements and materials tested in the railway industry. Our braking resistors meet the highest requirements in terms of quality, safety and durability. These reliable units are characterized by failure-free operation over a long period of time. [see our REFERENCES]

SIMPAX manufactures braking resistors for every application, power (from a few Watts to a MW) and load cycle. Thanks to product standardization [Wirewound resistors “RC” and Steel grid resistor “RP”], we can offer and make a standard braking resistor in a short time.

Note:Based on many years of experience and advanced 3D modeling, we can custom design a non-standard braking resistor, requiring unusual resistance elements and power [read RESISTORS IN SPECIALIZED CONSTRUCTION], including replacements units for old type braking resistors.

We invite you to familiarize yourself with the offer of braking resistors manufactured by SIMPAX:

  • braking resistors for railing stocks
  • braking resistor for other drives (see MORE)


SIMPAX sp. z o.o.

Grabonóg 76
63-820 Piaski
(k. Gostynia)

+48 65 571 20 60

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