Cressall Standard DBRs

Cressall's standard ranges of high capacity 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
SD and HPR 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

Fast delivery:
For same day dispatch of common stock items (ES and DBR) in the UK contact our UK 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 combined with accurate sizing software means we can predict the performance of your resistor for any specified duty cycle.

ES and DBR 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 - 8 kW 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.
• All units are available at short notice.

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
• Dispatched from stock for common sizes, manufactured in a few days for other ratings.

Power		Resistance	Resistance		Dimensions, mm				Mounting centres			Weight
kW	DBR	Min. Value	Tolerance		L	W	H		L	W		kg
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
1.5kW	HP1	10.0Ω	-0/+10%		508	144	140		451	86		4.5
3kW	HP2	5.0Ω	-0/+10%		508	239	140		451	181		6.5
4.5kW	HP3	3.3Ω	-0/+10%		508	333	140		451	275		8.5
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

SD and HPR series braking resistors - to 100kW

For higher power applications Cressall offer expanded mesh and stamped grid resistor designs, well proven in 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 stamped 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

Download: ES data sheet • Calculate Catalogue numbers

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Cressall Resistors Ltd, Evington Valley Road, Leicester, LE5 5LZ U.K. Tel: (+44) (0)116 273 3633