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- Power Resistors
  
  Liquid cooled
  
  Aluminium housing
  
  Ceramic carrier vitreous enamelled
  
  Air cooled
  
  Aluminium housing
  
  Steel-/ Stainless Steel housing
  
  Housing units
  
  Open coil resistors
  
  Ceramic carrier cement coated
  
  Ceramic carrier vitreous enamelled
  
  Fiber-glass carrier
  
  Ceramic casing
  
  Accessories
  
  Customized solutions
  
  PTC-Resistors
  
  Aluminum housing PTC
  
  Electronic controller
  
  MPM
  
  LPM
  
  PWM
  
  Relay box
Applications
- Industry
  
  Automation technology
  
  Power Engineering
  
  Equipment and plant construction
  
  Power Electronics
  
  Mechanical Engineerung
  
  Transport and Logistics
  
  E-Mobility
  
  Battery-Management
  
  E-Drives recuperation
  
  On Board Charger (OBC)
  
  High Voltage Coolant Heater
  
  Automotive
  
  Heating/ Conditioning
  
  Engine Cooling
  
  Ignition Systems
Products
- Power Resistors
  
  PTC-Resistors
  
  Electronic controller
  
  Liquid cooled
  
  Aluminium housing
  
  Ceramic carrier vitreous enamelled
  
  Air cooled
  
  Aluminium housing
  
  Steel-/ Stainless Steel housing
  
  Housing units
  
  Open coil resistors
  
  Ceramic carrier cement coated
  
  Ceramic carrier vitreous enamelled
  
  Fiber-glass carrier
  
  Ceramic casing
  
  Accessories
  
  Customized solutions
  
  Aluminum housing PTC
  
  MPM
  
  LPM
  
  PWM
  
  Relay box
Applications
- Industry
  
  E-Mobility
  
  Automotive
  
  Automation technology
  
  Power Engineering
  
  Equipment and plant construction
  
  Power Electronics
  
  Mechanical Engineerung
  
  Transport and Logistics
  
  Automation technology combines mechanical and electrical engineering to form efficient systems and plants. Whether servo controllers, frequency inverters or inverters, the particularly impulse-resistant power resistors of the KRAH Group are specially designed for use as braking resistors or charging and discharging resistors. These resistors have proven themselves millions of times over allowing your handling systems, robots, conveyor belts and sorting systems to work trouble-free and safely.
  KRAH power resistors are used in these application areas:
  • Electric Drives
  • Conveyor belts
  • Handling systems
  • Robotics
  • Robotic sorting plants
  
  Power resistors from the KRAH Group continue to play a decisive role in the field of electrical energy technology, which deals with electricity generating wind power, photovoltaics, transmission and conversion, and electrical energy storage; the latter is presently an increasingly frequent requirement. The special requirements such as high-voltage resistance, high energy absorption capacity or IP protection class are ideally met by the available resistance technologies. If a requirement cannot be mapped with the standard resistors, we will work with you to develop a suitable solution.
  KRAH power resistors - the first choice for:
  • Filter systems
  • Photovoltaic systems
  • UPS systems
  • Wind power plants
  • Heat pumps
  
  The resistors of the KRAH Group will undertake your tasks every day in an exemplary manner, whether as a reliable braking resistor in an elevator, or as a reliable filter resistor in a medical device. KRAH Group resistors are used worldwide in process technology systems, such as the chemical industry and on oil platforms where conditions can be very challenging.
  Our quality specifications, e.g. QSV and zero-defect strategy, offer you solutions for the challenges of equipment and plant construction:
  • Stage technology
  • Medical technology
  • Process engineering
  • Roll-up doors
  • Escalators and elevators
  
  The continuous and rapid development of power electronics, which has been going on for decades, also requires new solutions in the field of power resistors. With a wide variety of resistor technologies, we will find within the KRAH portfolio the suitable resistor for your DC link application, your load unit, or your pre-charge or dis-charge task. For a performance increase, designs with air- cooling, forced air-cooling as well as liquid-cooled versions are available for maximum power requirements.
  As a reliable partner, the KRAH Group offers customized resistor solutions for the following applications:
  • Frequency inverter
  • Rectifier
  • Capacitors
  • Servo controller
  
  Mechanical engineering is an exciting market segment in which designers are challenged to increase productivity, improve efficiency or optimize precision. With the support of simulation programs, the KRAH application engineers can also find the optimally dimensioned power resistor for your application in order to safely and reliably meet the requirements set as a brake, filter or charge / discharge resistor.
  KRAH power resistors have proved themselves being used in:
  • Production machines
  • Welding technology
  • Machine tools
  
  A smooth supply of goods requires highly available systems and equipment, both in procurement and in production. The flow of goods is increasing and must arrive at their destination faster than ever. As a result, the demands on infrastructure is also increasing; e.g. higher speeds in conveyor systems require more efficient braking resistors. The particularly impulse-resistant power resistors of the KRAH Group have been specially designed for use as braking, charging and discharging resistors.
  KRAH power resistors prove their worth every day in these systems:
  • Dynamic storage systems
  • E-stacking truck
  • Conveyor belts
  • Crane technology
  • Shipbuilding
  • Railroad engineering
  
  Battery-Management
  
  E-Drives recuperation
  
  On Board Charger (OBC)
  
  High Voltage Coolant Heater
  
  Within e-mobility, powerful electric motors are used with intelligent systems managing the exchange of energy between the drive and the battery. The inrush current during the precharging of DC-link capacitors is controlled by KRAH's pre-charge resistors, which have been designed for high voltage requirements and are particularly impulse-load resistant. Contact us and we will accompany you in your project as a partner with automotive QSV standards and provide you with resistors according to the AEC Q-200 quality standard.
  We offer solutions for:
  • Pre- and discharging of intermediate circuit capacitors
  • Voltage interruption and discharging in the event of a fault or crash
  
  During braking operations of e-vehicles the regenerative behaviour of the electric motor generates energy which is recharged into the battery system. If the battery is already fully charged and can no longer absorb energy, the generated energy must be absorbed by other consumers. KRAH braking resistors are suitable for this purpose. The generated heat can then for instance be used to heat the vehicle interior.
  We will be happy to advise you on solutions with air or liquid cooled power resistors which are ideally suited for electric or hybrid vehicles:
  • Brake resistors for recuperation operation
  • Brake resistors as electrical brakes
  
  In charging the battery by an external power supply/ grid, many electrical vehicles (BEV, PHEV) from cars up to floor-borne vehicles include an integrated charging circuit, which also realizes the pre- and discharge function of the DC-linked capacities. In this matter KRAH offers solutions for pre- and discharge functions based on resistors, optional extended to modules with integrated pre- and discharge relays.
  
  The coolant circuit is linked to the passenger compartment for heating purpose. For a rapid heating-up, KRAH offers additional heaters with high power, which will be direct placed in the fluid coolant. The geometries of these tubular heaters can be designed to the customer needs.
  
  Heating/ Conditioning
  
  Engine Cooling
  
  Ignition Systems
  
  For the blower speed control of fans in manual air conditioning systems (HVAC), multiple-step resistor solutions offer a very robust and approved technology. The KRAH Group is the world market leader in this segment and will always offer you the most suitable solution, such as wire-wound resistors on ceramic supports or plate style resistors.
  Do you need electronic controllers for your automatic air conditioning system? We are happy to support you.
  
  Electric fans are used for engine cooling in vehicles. Given the environmental conditions of such systems, resistor solutions for fan speed control with one or more steps are a very good choice. Typically wire wound resistors on ceramic carriers are used. The KRAH Group's product range also includes other technologies such as open coil resistors or plate style resistors.
  
  For the effective suppression of electromagnetic noise in vehicle ignition systems, the KRAH-Group offers a wide range of noise suppression resistors (NSR) with various terminals. The wire-wound resistor reduces electromagnetic interferences caused by high voltage pulses and sparks. Due to the wire winding, the resistor also contains inductance and capacitance. Within the alternating power circuit, the ohmic, inductive and capacitive values cause an impedance resulting in a high attenuation and thus noise suppression in important frequency ranges such as the AM or FM band. The prime influence on the required frequency ranges is the influence of inductance.
  The KRAH suppression resistors guarantee excellent noise reduction. Let us convince you of our competence.
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Power Resistors: Show all Liquid cooled Aluminium housing Ceramic carrier vitreous enamelled Air cooled Aluminium housing Steel-/ Stainless Steel housing Housing units Open coil resistors Ceramic carrier cement coated Ceramic carrier vitreous enamelled Fiber-glass carrier Ceramic casing Accessories Customized solutions
PTC-Resistors: Show all Aluminum housing PTC
Electronic controller: Show all MPM LPM PWM Relay box

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3 results

Productgroups

Power Resistors

Show all Liquid cooled Aluminium housing Ceramic carrier vitreous enamelled Air cooled Aluminium housing Steel-/ Stainless Steel housing Housing units Open coil resistors Ceramic carrier cement coated Ceramic carrier vitreous enamelled Fiber-glass carrier Ceramic casing Accessories Customized solutions

PTC-Resistors

Show all Aluminum housing PTC

Electronic controller

Show all MPM LPM PWM Relay box

3 results

HWG / HPR

High power resistors in a housing

technical data: more

rated power 750 - 3000 W
resistance range R45 … 320R
tolerance ±5% … ±10%
dimensions (LxWxH) 485 x 95 x 170 … 845 x 185 x 170 mm

downloads: more

Product information HWG / HPR Encapsulated high power resistors (HPR VHPR HPRF LCPR)

Tags: Housing units , Current-limiting resistor , Load resistor , Brake resistor , Industry , Automation technology , Power Engineering , Equipment and plant construction , Power Electronics

HWG / VHPR

High power resistors in a housing

technical data: more

rated power 100 - 2000 W
resistance range R10 … 30K
tolerance ±5% … ±10%
dimensions (LxWxH) 245 x 70 x 95 … 445 x 300 x 120 mm

downloads: more

Product information HWG / VHPR Encapsulated high power resistors (HPR VHPR HPRF LCPR)

Tags: Housing units , Current-limiting resistor , Load resistor , Brake resistor , Industry , Automation technology , Power Engineering , Equipment and plant construction , Power Electronics , Mechanical Engineerung , Transport and Logistics

RHGS

Brake resistors with tubular heating element in metal casing

technical data: more

rated power 2000 - 10000 W
tolerance ±10% … ±10%
dimensions (LxWxH) 683 x 330 x 295 … 683 x 330 x 295 mm

downloads: more

Product information RHGS Encapsulated high power resistors (HPR VHPR HPRF LCPR)

Tags: Housing units , Load resistor , Brake resistor , Heating resistor , Industry , Automation technology , Equipment and plant construction

Maerkische Straße 4
57489 Drolshagen

Germany

T +49 (0)27 61/ 7 01-0
F +49 (0)27 61/ 7 01-177

info@krah-gruppe.de

Products

Liquid cooled
Aluminium housing
Ceramic carrier vitreous enamelled
Aluminium housing
Steel-/ Stainless Steel housing
Housing units
Open coil resistors
Ceramic carrier cement coated
Ceramic carrier vitreous enamelled
Fiber-glass carrier
Ceramic casing
Accessories
Customized solutions
Aluminum housing PTC
MPM
LPM
PWM
Relay box

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