Power Resistors

Danotherm resistors are used in a wide variety of applications. As such, it is difficult to label them by application. Here, the resistor families are devided in the way of cooling.

It must be noted however, that also the self cooled types can be forced air cooled to improve power capability.

Danotherm power resistors are used as: filter, brake, shunt, snubber, dump, crowbar, charging, de-charging, pre-magnetizing, current limiting, fault detecting, neutral earthing, cabinet heating, de-humidifying, motor starter, ballancing, load bank, voltage dividing, inrush current limiting and ballast resistors and in many other applications.

Load banks

Main parameters

Nominal voltage
Power
Number of steps and power rating per step
Type of ventilation: natural convection or forced air
Mounting position: horizontal or vertical (forced air only)

Additional parameters

Thermal drift: the difference in ohmic value of the resistor elements between cold and hot condition.
Ingress protection degree, IP20 / IP21 / IP23
Auxiliary components
Environment

Enclosures can be made of galvanized steel DX51D+Z275-M-A-E, mild steel painted in any RAL color or stainless steel types AISI 304 or AISI 316.

Description

Load banks are used for testing equipment such as (emergency) generators and UPS systems or also as dummy loads to maintain the generator at a minimum temperature. Load banks are offered from a few kW up to 10MW and from working voltages of a few hundred volts up to 36kV. Load banks are built from several steel-grid building-blocks making it easy to split up the load bank into (many) smaller loads. Load banks are made for both indoor and outdoor use in IP classes up to IP 23. Higher IP ratings are problematic as it becomes more difficult to dissipate heat.

 

forced air cooled power resistor

Traction brake resistors

Salient features

Railway standards:

IEC 60322:2001
IEC 61373:2010
UNE-EN 50124-1:2001
UNE-EN 50125-1:2001
ANSI/IEC 60529:2004

Description

Brake resistors for Railway applications can be positioned on the roof, under the frame or inside the vehicle in a special compartment. Traction brake resistors are constructed according legislation and international directives. They are always customized and tailored to the ambient conditions such as air temperature, humidity, mechanical forces and dimensions. Test for homologation on vibration, fire and smoke and humidity are performed at external test facilities close to the factory.

 

forced air cooled power resistor

Ventilator cooled type TRV

Salient features

  • Power 50 - 275kW
  • Overload factor 7xPn @5s
  • Working voltage 1000VAC/1400VDC
  • Dielectric strength 50Hz 1 min. 3500V
  • Protection degree IP65 / IP66
  • Cooling method forced air

Description

TRV resistors are high power, forced air cooled resistors, suitable to be used in harsh environments. Protection degree is IP65 / IP66. The power ranges from 50 – 275 kW. TRV units are fitted with 2 or with 4 strong ventilators to cool the resistor elements. The unit can be as a single resistor group or with multiple groups, in various electrical topologies. Applications are brake resistors on cranes in harbor or deck winches.

 

forced air cooled power resistor

Salient features

  • Power 6 - 23kW
  • Overload factor 6-20xPn @ 5s
  • Working voltage 1000VAC / 1400VDC
  • Dielectric insulation voltage (50Hz, 1 min) 3500V
  • Protection degree IP50 / IP54 / IP65
  • Ohmic range 0R04 - 220R

Datasheet

Description

CBW resistors consist of a aluminium housing with liquid cooling channels integrated. Inside is the active resistor wire which is incapsulated with sand. CBW resistors combine very high overload capability with liquid cooling. They are ideally suited as high power brake resistors with medium average power. CBW resistors are also used as filter resistors.

 

Salient features

  • Power 40 - 1300kW
  • Overload factor 4xPn @ 5s
  • Working voltage 1000VAC / 1400VDC
  • Dielectric insulation voltage (50Hz, 1 min) 3500V
  • Protection degree IP65 / IP66
  • Cooling method water / water + glycol

Description

WHDN are Danotherms largest, high power resistors. The power ranges from 40-1450kW. They consist of a steel tank with resistor tube elements fitted. The tank is fully welded. Depending on the environmental conditions steel AISI304 or AISI316 is chosen. All WHDN resistors are customized. Water in- and outlet, size of electrical terminals and protection circuits define the design.

 

Liquid cooled power resistor

Salient features

  • Power 6 - 100kW
  • Overload factor 4xPn @ 5s
  • Working voltage 1000VAC / 1400VDC
  • Dielectric insulation voltage (50Hz, 1 min) 3500V
  • Protection degree IP65 / IP66
  • Cooling method water / water + glycol

Description

WHBS are water cooled, high power resistors. The power ranges from 6-100kW. They consist of a steel tank with resistor tube elements fitted. The tank is fully welded. Depending on the environmental conditions steel AISI304 or AISI316 is chosen. All WHBS resistors are customized. Water in- and outlet, size of electrical terminals and protection circuits define the design.

 

Liquid cooled power resistor

Salient features

  • Power 50 - 200kW
  • Overload factor 4xPn @ 5s
  • Working voltage 1000VAC / 1400VDC
  • Dielectric insulation voltage (50Hz, 1 min) 3500V
  • Protection degree IP65 / IP66
  • Cooling method water / water + glycol

Description

WHBSA are water cooled, high power resistors. The power ranges from 50-200kW. They consist of a steel tank with resistor tube elements fitted. The tank is fully welded.

This type of resistors is most suited as brake resistor for busses and trucks. For marine applications we recommend to use WHBS or WHDN series.

 

Liquid cooled power resistor

Salient features

  • Power 6 - 23kW
  • Overload factor 4xPn @ 5s
  • Aluminium housing
  • Working voltage 1000VAC / 1400VDC
  • Dielectric insulation voltage (50Hz, 1 min) 3500V
  • Protection degree IP00 / IP65
  • Cooling method water / water + glycol

Description

WHB are water cooled, medium power resistors. The power ranges from 6-23kW. They consist of an aluminium housing with resistor tube elements fitted. It can be fitted with a terminal box or with M6 treaded rods. For marine applications we recommend to use WHBS (fully welded, stainless steel version). 

Liquid cooled power resistor

Salient features

  • High Voltage resistor
  • Power 15 - 25kW
  • Working voltage 6.6kVAC
  • Dielectric insulation voltage (50Hz, 1 min) 20kV
  • Protection degree IP65
  • Cooling method de-ionised water / de-ionised water + glycol

Description

WHHB resistors consist of a aluminium housing with inside the active resistor wire which is directly in contact with the cooling liquid. The cooling liquid must be de-ionised water. Glycol may be added as long as the conductivity of the liquid stays below 2 microS/cm. WHHB resistors are used in high voltage systems, mostly as filters.

 

Liquid cooled power resistor

Salient features

  • Power 45 - 175W
  • Overload factor 5-7xPn @5s
  • Working voltage 850VAC/1400VDC
  • Dielectric strength 50Hz 1 min. 2500V
  • Protection degree IP50
  • Cooling method forced air

Datasheet

Description

Danotherm has developed very flat power resistors for moderate power brake applications in drive systems, braking a few hundreds of watts to few kilowatts during a short time.

The Bi-alpha is available in 3 sizes; Bi-Alpha 4, 5 and 6. Their nominal power is rated at 45W for size 4, 100W for size 5 and 175W for size 6. These values are valid for forced air cooling of 2m/s. By increasing the airspeed the nominal power can be increased. Because of its low profile height they can easily be mounted at the back side of an VFC (Voltage Frequency Converter).

The Bi-Alpha is a simple construction where the resistor wire is wounded on a mica substrate and insulated by mica sheets on both sides. This element is enclosed in a metal alloy housing made from aluminium and zinc. The Bi-Alpha resistors are a cost effective solution for small to medium power drive systems.

Connection leads are insulated with high temperature silicon, rated at 250°C. IP value for each size is IP50.

 

Heatsink power resistor

Salient features

  • Power 12 - 300W
  • Working voltage 1200VAC
  • Dielectric strength 50Hz 1 min. 2500V
  • Protection degree IP00/IP50
  • Cooling method heatsink
  • Ohmic range 0R1 - 39kR

Datasheets:

Description

HSD / HSF are wirewound resistors on mica elements, fitted into a heatsink filled with a silicone rubber which is UL recognized up to a working temperature of 220°C. They are ideally suited as balancing resistors. HSD types have its terminals upwards (vertical) to the heatsink. HSF have its terminals parallel to the heatsink. Its nominal power depends on the heatsink temperature it is mounted on.

 

Heatsink power resistor

Salient features

  • Power 12 - 300W
  • Working voltage 1200VAC
  • Dielectric strength 50Hz 1 min. 2500V
  • Protection degree IP00/IP50
  • Cooling method heatsink
  • Ohmic values 470R and 24kR

Datasheets:

Description

HSCC and HSAC are thick film resistors. for optimum cooling they must be mounted on a heatsink. Due to theri very low inductivity, these resistors are ideally suited as snubber or filter resistor in power electronic inverters. HSCC and HSAC are available in 470R and 24kR. Other values are available on request.

 

heatsink power resistor

Salient features

  • Power 95 - 335W
  • Working voltage 600V / 1000V
  • Dielectric strength 50Hz 1 min. 2500V
  • Tolerance ± 15%, optional ± 3% or ± 1%
  • Protection degree IP00 / IP50
  • Ohmic range 3k3 / 3k9 / 4k7 / 5k6 / 6k8 / 8k2 / 10k
  • Cooling method heatsink

Datasheet

Description

HSP resistors are thick film resistors in an aluminium housing. They are intended to be mounted on a heatsink to allow maximum dissipation. Thick film resistors have virtually no inductance and are therefore ideally suited for snubbers in switching circuits. HSP resistors have its connections parallel to the heatsink. HSV have its connections in vertical position. Thick film resistors can be produced with 15%, 3% or 1% tolerance on Ohmic values.

 

heatsink power resistor

Salient features

  • Power 100 - 600W
  • Overload factor [email protected]
  • Working voltage 1500V / 5000V
  • Dielectric strength 50Hz 1 min. 2500V / 7000V
  • Tolerance ± 10 % (on request up to ± 1%)
  • Protection degree IP00
  • Cooling method heatsink

Description

PR resistors are thick film resistors and are offered in two mechanical sizes. PR100 for 100W and PR250 / PR600 for 250 and 600W. These resistors must be mounted on a heatsink of sufficient size to allow the maximum dissipation. Thick film resistors have virtually no inductance. PR types can have a single or a double resistor in one housing. PR250 has optional high voltage connection terminals and can be used in systems with working voltage up to 5 kVAC .

 

Salient features

  • Power 500 - 2500W*
  • Working voltage 600VAC / 850VDC
  • Dielectric strength 50Hz 1 min. 3500V
  • Protection degree IP00 / IP50 / IP65
  • Ohmic range 2R0 - 2kR
  • Cooling method heatsink

* Heatsink cooled values

Datasheet

Description

These resistors belong to the lower power ratings of the aluminium housed types. They are mostly used in DC-links for charging and de-charging and in small inverter drives systems as brake resistor. CCH can be mounted on a (water) cooled plate to increase the nominal power. The nominal power ranges from 100-570W when cooled by natural air. When mounted on a water cooled plate the nominal power ranges from 500W - 2500W. 

aluminium heatsink power resistor

Salient features

  • Power 12-250W
  • Overload factor 5xPn @ 5s
  • Dielectric insulation voltage (50Hz, 1 min) 1500-4500V
  • Cooling method heatsink / natural air
  • Ohmic range series E24 (10mR-120kR)
  • Protection degree IP00
  • Working Voltage 265-2300V

Description

Extruded aluminium housing provides superior heat conduction. Housing deep finned for maximum heat dissipation at natural or forced air convection. Gold anodized finish for maximum resistance to environmental conditions. Special thermosetting compound with high thermal conductivity. Winding designed to give maximum core coverage and uniformity for even heat dissipation. Core centerless ground for maximum winding uniformity. Marking at top surface for easy identification after mounting. Complete welded construction terminal to terminal.

 

Downloads

  • Certificates
    CoC CBT CBS

    CoC CBT/CBS

    CoC CMQ CVS

    CoC CMQ/CVS

    Declaration of Conformity Alpha

    Declaration of Conformity
    aluminium housed

    Declaration of Conformity Wirewound

    Declaration of Conformity wirewound

    Peter Mandel

    ISO 9001

    Peter Mandel

    ISO 14001

    CoC Alpha resistors

    CoC Alpha

  • Brochures
    Michael H. Laursen

    General Alpha

    Peter Mandel

    General high power collection

    ATE electronics

    ATE electronics

    ATE electronics

    Backer Steel grid

  • Datasheets
    aluminium housed brake filter charge resistors

    CCH/CAH/CAR

    aluminium housed brake filter charge resistors

    CBH/CBR

    aluminium housed brake filter charge resistors

    CBT

    aluminium housed brake filter charge resistors

    CBS/CMQ/CVS/HVBS

    aluminium housed brake filter charge resistors water cooled

    CBW

    steel grid brake resistors

    Steel grid brake

    steel grid filter resistors

    Steel grid filter

    steel grid neutral earthing resistors

    Steel grid NER

    steel grid brake resistors traction

    Steel grid railway

    heatsink cooled resistors

    Heatsink HSCC

    heatsink cooled resistors

    Heatsink HSD

    heatsink cooled resistors

    Heatsink HSF

    heatsink cooled resistors

    Heatsink HSP/HSV

    de-humidifying resistors

    De-humidify

    aluminium housed resistors

    axial CS / SR

    heatsink cooled resistors

    axial RB

    heatsink cooled resistors

    axial RB6

    Peter Mandel

    axial RB7

    heatsink cooled resistors

    PR100

    heatsink cooled resistors

    PR250

    PR600 thick film resistor

    PR600

    steel tube resistors

    PCG

    aluminium housed brake filter charge resistors

    E6

    aluminium housed brake filter charge resistors

    stock CCH 110

    aluminium housed brake filter charge resistors

    stock CAH 165

    aluminium housed brake filter charge resistors

    stock CBH 165

    aluminium housed brake filter charge resistors

    stock CBH 265

    aluminium housed brake filter charge resistors

    stock CBR 225

    aluminium housed brake filter charge resistors

    stock CBR 295

    heatsink cooled resistors

    axial RB8

    heatsink cooled resistors

    axial RB106/256

    variable rheostat resistors

    Rheostat

    wirewound cement coated resistors

    Wirewound

  • Sales T&C
    Michael H. Laursen

    Sales T&C

  • Environmental
    Michael H. Laursen

    RoHS

    Peter Mandel

    REACH

  • Conflict minerals
    Michael H. Laursen

    Conflict minirals

  • Technical
    Thermal models and thermal simulations on brake resistors

    Simulations

    A brake resistor perspective on cables

    A perspective on Cables

    A brake resistor perspective on corrosion

    A perspective on Corrosion

    A brake resistor perspective on thermal management

    A perspecitive on Thermal Management

    A brake resistor perspective on voltage ratings

    A perspective on Voltage ratings

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+45 3673 2222

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