Cressall’s standard ranges of high capacity dynamic braking resistors (DBRs) for regenerative and rheostatic electric motor braking are low cost, easy to specify, quick to install and with ratings to suit inverter drives of any power. Our wide range of resistor technologies means that we can select the most technically appropriate and cost-effective resistor design for any application, whether continuous, intermittent or infrequent.

Braking Resistors offer two product ranges to cover continuous powers up to 100kW:

  • ES and DBR ranges for powers to 25kW
  • SD and HPR ranges for powers to 100kW

Benefits of using Braking Resistors

  • Low cost: Achieved through better design, standardisation and use of common components
  • Easy to specify: Standard enclosure designs for powers to 100kW
  • Standard power ratings: Continuous ratings from 600W to 100kW continuous

Our range of Braking Resistor elements combine excellent heat dissipation for continuous braking with the highest active surface area per kW in the industry, giving outstanding short-time performance for repetitive braking duties.

ES and Braking Resistor Designs to 25kW

Cressall ES and DBR braking resistors are based on two types of resistor elements:

  • HP Coils: spiral wire-wound coils on ceramic formers
  • ZC Coils: edge-wound coiled strip on ceramic formers

Both elements offer high overload capacity and rapid cooling. The alloys used have low changes in resistance over the temperature range: no more than 18%, unlike designs using 304 stainless steel which can increase in resistance during the heating cycle by as much as 50%, resulting in lower braking currents and less effective braking.

ES Series, 0.6 – 8kW Continuous

  • Spiral wire wound resistor element on ceramic former
  • Negligible noise
  • Low inductance
  • Temperature stable design, low increase of resistance value
  • Optional thermal switch
  • Terminal block mounted at one end of the enclosure, cover for terminal block, allow for ingress protection IP 20
  • Easy installation: Pre-drilled mounting holes, knock-outs in terminal cover, units suitable for horizontal or side mounting.

DBR Series, 6 -25 kW Continuous:

  • Spiral wire or wound edgewound strip resistor element
  • Temperature stable design, low increase of resistance value
  • Standard thermal switch
  • Option for IP21 drip proof canopies
  • Integral terminal compartment
  • Easy installation: Pre-drilled mounting holes, knock-outs in terminal compartment, units suitable for horizontal or side mounting.
  • Option for 304 stainless steel enclosures

Cressall Braking Resistors ranges include: