STANDARD BRAKING RESISTORS ON DEMAND

Cressall’s standard ranges of high capacity dynamic braking resistors (DBRs) for regenerative 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.
We offer two product ranges to cover continuous powers up to 100kW:
ES and DBR ranges for powers to 25kW
Expanded mesh and HPR Grid ranges for powers to 100kW

 

BENEFITS OF USING CRESSALL DBRs

  • 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
  • Extensive testing data means we can accurately predict thermal performance and optimise resistor selection for the specified duty.

Fast delivery:  For same day dispatch of stock items (ES and DBR) in the UK contact our distributor: CP Automation before 10.00am. Units not held in stock can be manufactured quickly.

Performance: Our range of 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.

Confidence: Our experience in supplying resistors for electric motor brakes combined with accurate sizing software means we can predict the performance of your resistor for any specified duty cycle.

ES & BRAKING RESISTOR DESIGNS UP 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 0.6 - 8kW & DBR SERIES 9 - 25kW CONTINUOUS

ES Series, 0.6 – 8kW Continuous

  • Our ES range is usually available from stock so there’s no waiting for the right DBR
  • 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, 9 – 25 kW Continuous:

  • Wire or wound edge-wound 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
  • Dispatched from stock for common sizes, manufactured in a few days for other ratings.
Power
kW
DBR Resistance
Min. Value
Resistance
Tolerance
Dimensions
mm
Mounting
centres
Weight
Kg
LWHWH
0.6kW ESH 4.7Ω -0/+5% 288 121 141 236 92 1.4
1kW EST 6.8Ω -0/+5% 367 121 141 315 92 1.8
1.5kW ES1 10.0Ω -0/+5% 467 121 141 415 92 2.2
2kW EST2 3.3Ω -0/+5% 367 213 141 315 185 3
3kW ES2 5.0Ω -0/+5% 467 213 141 415 185 3.8
4.5kW ES3 3.3Ω -0/+5% 467 307 141 415 278 5.4
6kW ES4 1.5Ω -0/+5% 500 388 195 410 360 6.6
8kW ES8 0.75Ω -0/+5% 500 388 390 410 360 11.5
6kW DBR12 2.7Ω -0/+10% 766 330 140 700 290 16
9kW DBR18 2.7Ω -0/+10% 800 335 304 700 290 25
12kW DBR24 2.7Ω -0/+10% 800 335 304 700 290 33
18kW DBR36 1.5Ω -0/+10% 800 335 429 697 280 45
25kW DBR54 1.5Ω -0/+10% 800 539 453 697 480 60

EXPANDED MESH & HPR GRID BRAKING RESISTORS TO 100kW

For higher power applications Cressall offer expanded mesh and HPR grid resistor designs, well proven in regenerative braking applications around the world.

With these elements we can offer flexible and cost effective solutions for higher powers and heavy overloads.

Units are designed to meet the customer’s specified duty but are based on standard formats, meaning that design, manufacture and despatch can be in just a few weeks.

  • Low inductance expanded mesh or HPR grid element
  • Choice of resistance alloys giving a wide cost vs. performance option
  • Choice of enclosure materials: pre-galvanised mild steel, 304 or 316 stainless steel allowing designs to be optimized for both price and performance.
  • Optional thermal switch Option for IP23 drip proof canopies
  • Manufactured to order but dispatched in a few weeks to standard designs

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