Within the Backer Group we can offer a wide range of technologies for production of resistors.
An advantage with resistors from Backer is that they can withstand high loads, since we use large diameter resistance wires which gives low resistance. The posibility to use water/liquid as cooling media enables high power resistance and we also offer large element diameters, which withstands high voltage.

All resistors are custom made, but our standard concept speeds up the development process.

>> Esempi di prodotti

  • Brake resistors
  • Power resistors
  • Load resistors
  • Shunt resistors
  • Water- /liquid cooled resistors

The elements are 100% tested for insulation and dielectric rigidity. Also, the elements are often built into protection cages to prevent contact with heated parts. Also, computerized load simulation is done to optimize each resistor application.

Terminal boxes with different IP class can be used.
link to Backer terminal boxes >> (opens in new window)

Numerous elements are often connected together, series and/or parallel, to achieve intended properties.

pdf icon PDF: Resistori - Info generali

>> Esempi di applicazioni

  • Trains
  • Hybride vehicles
  • Wind power mils
  • Ships
  • Cranes
  • Trams
  • Frequency converters
  • Sine-wave filter resistors


Dati tecnici

Material Steel - Grade D
Stainless steel - EN 1.4301, EN 1.4404, UNS S31254, UNS N08904, Incoloy 800, Incoloy 825
Aluminum AA6060, AA6063
Types of cooling Air: convection or forced convection
Liquid: water, oil etc.
Dimensions Tubular elements: Ø 8.5, 14, 21 mm
Alu-profile I- or X- shaped, with or without cooling fins
Fastening of elements Flanges: welded or brazed
Nipples: pressed or brazed
Connection Wiring
Threaded pins M4/M6


 Ø 8,5mm
Ø 14mm
Ø 18mm  Ø 21mm
 Min. resistance/ element  0.12 ohm/m 0.06 phm/m 1.6 ohm/m 1.5 ohm/m 
 Reistance tolerance ± 5%  ± 5% ± 5%  ± 5% 
 Dielectric strenght 1.5 kV DC
1 min 
4 kV DC
1 min 
7 kV DC
1 min 
9 kV DC
1 min 
 Lenght  300 - 6000 mm 300 - 6000 mm 300 - 1500 mm 300 - 1500 mm
 Min. bending radius  12.5 mm 25 mm 40 mm 60 mm
 Inductance  0.5-1 µH/element


Other resistors - a wide product range

Danotherm, a part of the Backer Group, are experts on electric resistors and brake resistors. They are known world-wide for the qualified design and hi-quality production of resistors for e.g. electro mechanic-, wind power mill- and the tele-com industry.

Among their products can be mentioned:

  • Aluminium housed resistors
  • Ceramic Wirewound resistors
  • Open wirewound resistors
  • Rheostats
  • Steel grid resistors

>> Link to Danotherm's homepage and more information about their wide product range

danotherm ITALIA