Power

Power

Here at Rhopoint Nordic we can offer a vast selection of power resistors for various applications by a range of industry leading manufacturers including Alpha Electronics, Isabellenhuette, RARA and Riedon. Variety of package sizes both surface-mount and through-hole, resistance values, tolerances and other variables, as well as fully customisable options are available, with the most common options held in stock at out UK office for quick delivery.

Can't find what you're looking for? Contact us, we can often offer customised solution to meet all your needs.

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Alpha FNP Series

The FNP high power precision shunt resistor series from Alpha Electronics offers a range of very high precision current sensing shunts with a maximum power rating of 500W on a suitable heat sink at +25°C. By utilising a Ni-Cr Bulk Metal® foil resistor technology, they are able to produce resistors with low temperature coefficients. The FNP shunt resistor series has a built in Pt100 sensor for monitoring the temperature of the resistive element.

  • High power precision shunt resistor
  • Available in any resistance between 0.001Ω and 1Ω (higher values may be available upon request)
  • Tight tolerance options as low as ±0.05% available
  • Tight TCR options available of ±1 ppm/°C and ±2.5 ppm/°C (+25°C to +60°C) or ±5 ppm/°C (-25°C to +125°C)
  • Maximum rated power of 500W
  • Maximum working current of 320A
  • Maximum rated operating temperature +75°C (resistance values greater than 0.01Ω, +25°C for resistances of 0.01Ω or below)
  • Working temperature from -55°C up to +125°C
  • Single pulse power load of 50J (<10ms)

The Alpha Electronics FNP precision shunt resistor series are constructed out of the following materials:

  • Base plate - Nickel-plated Copper
  • Current terminals - Nickel-plated Copper (T = 1.0mm)
  • Voltage and Pt terminals - Nickel-plated Copper (T = 0.5mm)
  • Package - PPS injection-moulded case

Alpha's Ni-Cr Bulk Metal® foil resistor technology means these high power precision shunt resistors resistors are ideal in applications like:

  • Output reference of precision power supply
  • Reference of charge-discharge test for high capacity batteries

The below table gives a summary of the specifications and options available for the Alpha FNP series:

Alpha FNP Specifications

* Keep temperature of the resistive element surface less than +125°C
** Please contact us for higher resistance values

£0.00 Ex Tax: £0.00

Alpha PSB Series

The PSB ultra-precision power shunt resistor series from Alpha Electronics offers 4-terminal (Kelvin) connections for current sensing and a power rating of up to 40W on a heat sink or 12W in free air (at +25°C) all with a low ohmic resistance range from 0.001Ω to 1Ω. By utilising Alpha's Bulk Metal® foil resistor technology, they are able to offer excellent temperature characteristics with low temperature coefficients down to ±5 ppm/°C between the resistance range 0.005Ω and 1Ω.

  • Ultra-precision power shunt resistor
  • Available in any resistance between 0.001Ω and 1Ω
  • 4-terminal (Kelvin) connection high power shunt
  • High heat dissipation due to aluminium-clad construction with fins
  • Power rating of 40W on a heat sink or 12W in free air at +25°C
  • Tolerances as low as ±0.1% over the whole resistance range
  • Tight TCR available of ±5 ppm/°C between 0.005Ω and 1Ω
  • Maximum working current of 100A
  • Maximum rated operating temperature +25°C
  • Working temperature from -55°C up to +85°C

The PSB ultra-precision shunt resistor series exhibits excellent temperature characteristics thanks to Alpha's Bulk Metal® foil resistor technology, making them suitable for the most demanding precision and high power applications.

The 4-terminal connections of this high power shunt series offers accurate current sensing capabilities even in low extremity of resistance.

The PSB series has been designed for easy mounting to heat sink or water-cooled radiator as well as with threaded holes to fix cables with screws (Caution: please screw current terminals >5N·m and voltage terminals >1N·m)

Their 4-terminal design and high precision make them ideal for current sensing in precise power supply or motor driver applications.

The below table gives a summary of the specifications and options available for the Alpha PSB series:

Alpha PSB Specifications

* Thermal resistance of the heat sink 1°C/W
Available to use higher rated power with elevation of cooling effect
Please keep temperature of element surface less than +60°C

£0.00 Ex Tax: £0.00

Isabellenhütte BAC Series

The BAC precision resistor series from Isabellenhütte includes a PCB with connector for voltage sensing, designed for battery management systems or welding equipment with a low resistance value of 50µΩ or 100µΩ. The BAC series from Isabellenhütte is available with untinned or Ni-plated terminals, continuous load up to 550A (50µΩ) within a chip size of 8420.

  • 2-terminal shunt resistor
  • Maximum fastening torque of 10Nm
  • Shunt available with untinned or Ni-plated terminals
  • Permanent power up to 15W
  • Resistance values of 50µΩ or 100µΩ
  • TCR of <150 ppm/K (between +20°C and +60°C)
  • Applicable temperature range from -10°C to +125°C
  • Tolerance of ±5.0%
  • 8420 Chip size

Typical applications for the BAC series include:

  • Current sensor for electronic battery management in motor cars, trucks, forklifts, hybrid and electric vehicles
  • Current sensing in bus bars
  • Current sensing in welding equipment

The below table gives an overview of the specifications for the Isabellenhütte BAC series:

Isabellenhütte BAC Specifications

£0.00 Ex Tax: £0.00

Isabellenhütte BKW Series

The BKW 4-terminal precision resistor series from Isabellenhütte, designed for energy meters with resistance values from 0.0003Ω to 0.0005Ω. The BKW series from Isabellenhütte has extremely good long-term stability, thus the energy meters do not require any recalibration, very high reproducibility of R-value and TCR.

  • 4-terminal precision resistor, independent from temperature because of lowest TCR-values
  • Massive copper terminals
  • Mounting: screwed on terminals of kWh-meter
  • Permanent current upto 100A (0.0003Ω)
  • Resistance values 0.0003Ω, 0.0004Ω and 0.0005Ω
  • TCR value <20 ppm/K (from +20°C to +60°C)
  • Applicable temperature range from -55°C to +140°C
  • Tolerance ±5.0%
  • Qualified for 20A, 40A, 60A and 80A energy meters

Typical applications for the BKW series include:

  • Ideal for single and three phase energy meters
  • Battery current sensing

The below table gives an overview of the specifications for the Isabellenhütte BKW series:

Isabellenhütte BKW Specifications

£0.00 Ex Tax: £0.00

RARA FRH 25C Series

The FRH 25C metal clad thick film resistor series from RARA offers a power rating of up to 15W on a heat sink and 5W in free air with available resistance values between 1kΩ and 2MΩ (non-inductive design). These high power resistors are available with tolerances of ±1%, ±2%, ±5% and ±10.0%. The FRH 25C series from RARA has a cement moulding within an aluminium housing, which mounts on to a chassis to utilise the heat sink effect, all with a temperature range from -15°C up to +105°C.

  • Metal clad thick film resistor
  • Resistance range available between 1kΩ and 2MΩ
  • TCR of ±200 ppm/°C 
  • Tolerance values available ±1%, ±2%, ±5% and ±10%
  • Power rating of 15W on a heat sink or 5W in free air
  • Insulation resistance of 20MΩ minimum
  • Temperature range between -15°C and +105°C
  • High stability at conventional power ratings
  • Short time overload of 2 x power rating for 5 seconds

The below table gives the specifications available for the FRH series including the FRH 25C resistors:

RARA FRH 25C Specifications

*30W on heat sink (178x127x51x1mm), 50W on heat sink (305x305x2mm)

*Option of ±20 ppm/°C is available upon request, please contact us for further details

£0.00 Ex Tax: £0.00

RARA FRH 50C Series

The FRH 50C metal clad thick film resistor series from RARA offers a power rating of up to 25W on a heat sink and 8W in free air with available resistance values between 1kΩ and 2MΩ (non-inductive design). These high power resistors are available with tolerances of ±1%, ±2%, ±5% and ±10.0%. The FRH 50C series from RARA has a cement moulding within an aluminium housing which mounts on to a chassis to utilise the heat sink effect, all with a temperature range from -15°C up to +105°C 

  • Metal clad thick film resistor
  • Resistance range available between 1kΩ and 2MΩ
  • TCR of ±200 ppm/°C 
  • Tolerance values available ±1%, ±2%, ±5% and ±10%
  • Power rating of 25W on a heat sink or 8W in free air
  • Insulation resistance of 20MΩ minimum
  • Temperature range between -15°C and +105°C
  • High stability at conventional power ratings
  • Short time overload of 2 x power rating for 5 seconds

The below table gives the specifications available for the FRH series including the FRH 50C resistors:

RARA FRH 50C Specifications

*30W on heat sink (178x127x51x1mm), 50W on heat sink (305x305x2mm)

*Option of ±20 ppm/°C is available upon request, please contact us for further details

£0.00 Ex Tax: £0.00

RARA IRB120 Series

The IRB120 metal clad wire wound economy resistor series from RARA offers a power rating of up to 120W with available resistance values between 0.1Ω and 1.3kΩ (inductive design) or between 0.1Ω and 300Ω (non-inductive design). These high power resistors are available with tolerances of ±2.0%, ±3.0%, ±5.0% and ±10.0% other options available including inductive or non-inductive resistive windings. The IRB120 series from RARA come in a durable metal case with flying leads and offers a temperature range from -55°C up to +200°C

  • Metal clad wire wound economy resistor
  • Inductive resistance range available between 0.1Ω and 1.3kΩ
  • Non-inductive resistance range available between 0.1Ω and 300Ω
  • Flying lead terminals
  • TCR of +260 ppm/°C maximum
  • Tolerance values available of ±2.0%, ±3.0%, ±5.0% and ±10.0%
  • Power rating of 120W
  • Insulation resistance of 20MΩ minimum
  • Temperature range between -55°C and +200°C
  • Short time overload of 10 x power rating for 5 seconds

The below table gives the specifications available for the IRB series including the IRB120 resistors:

RARA IRB120 Specifications

£0.00 Ex Tax: £0.00

RARA IRB60 Series

The IRB60 metal clad wire wound economy resistor series from RARA offers a power rating of up to 60W with available resistance values between 0.1Ω and 270Ω (inductive design) or between 0.1Ω and 56Ω (non-inductive design). These high power resistors are available with tolerances of ±2.0%, ±3.0%, ±5.0% and ±10.0% other options available including inductive or non-inductive resistive windings. The IRB60 series from RARA come in a durable metal case with flying leads and offers a temperature range from -55°C up to +200°C

  • Metal clad wire wound economy resistor
  • Inductive resistance range available between 0.1Ω and 270Ω
  • Non-inductive resistance range available between 0.1Ω and 56Ω
  • Flying lead terminals
  • TCR of +260 ppm/°C maximum
  • Tolerance values available of ±2.0%, ±3.0%, ±5.0% and ±10.0%
  • Power rating of 60W
  • Insulation resistance of 20MΩ minimum
  • Temperature range between -55°C and +200°C
  • Short time overload of 5 x power rating for 5 seconds

The below table gives the specifications available for the IRB series including the IRB60 resistors:

RARA IRB60 Specifications

£0.00 Ex Tax: £0.00

RARA IRB80 Series

The IRB80 metal clad wire wound economy resistor series from RARA offers a power rating of up to 80W with available resistance values between 0.1Ω and 910Ω (inductive design) or between 0.1Ω and 110Ω (non-inductive design). These high power resistors are available with tolerances of ±2.0%, ±3.0%, ±5.0% and ±10.0% other options available including inductive or non-inductive resistive windings. The IRB80 series from RARA come in a durable metal case with flying leads and offers a temperature range from -55°C up to +200°C

  • Metal clad wire wound economy resistor
  • Inductive resistance range available between 0.1Ω and 910Ω
  • Non-inductive resistance range available between 0.1Ω and 110Ω
  • Flying lead terminals
  • TCR of +260 ppm/°C maximum
  • Tolerance values available of ±2.0%, ±3.0%, ±5.0% and ±10.0%
  • Power rating of 80W
  • Insulation resistance of 20MΩ minimum
  • Temperature range between -55°C and +200°C
  • Short time overload of 10 x power rating for 5 seconds

The below table gives the specifications available for the IRB series including the IRB80 resistors:

RARA IRB80 Specifications

£0.00 Ex Tax: £0.00

RARA IRF100 Series

The IRF100 flat type metal clad wire wound resistor series from RARA, offers a power rating of up to 100W on a heat sink and available resistance values between 1Ω and 1.1kΩ. These high power and low inductance resistors are designed for industrial and other applications where space is at a premium, the flat design also allows for excellent heat dissipation. The IRF100 series from RARA offers an extruded aluminium housing which provides strong and rugged protection, with options of cement or silicone filling materials as well as tolerances as low as ±0.5%. This resistor series offers a temperature range from -55°C up to +200°C (cement filling material).

  • Flat space saving metal clad wire wound resistor
  • Cement (standard) or silicone filling material with an extruded aluminium housing
  • 300mm flying leads 
  • Resistance ranges available between 1Ω and 1.1kΩ
  • TCR of +260 ppm/°C maximum
  • Tolerance values available of ±0.5%, ±1.0%, ±2.0%, ±5.0% and ±10.0%
  • Power rating of 100W (on a heat sink)
  • Insulation resistance of 20MΩ minimum
  • Temperature range between -55°C and +200°C (cement) or -55°C and +150°C (silicone)
  • Short time overload of 5 x power rating for 5 seconds

Typical applications for the IRF series include:

  • Motor drives
  • Braking and snubbing applications
  • Power sources for industrial equipment

The below table gives the specifications available for the IRF series including the IRF100 resistors:

RARA IRF100 Specifications

£0.00 Ex Tax: £0.00

RARA IRF150 Series

The IRF150 flat type metal clad wire wound resistor series from RARA, offers a power rating of up to 150W on a heat sink and available resistance values between 1Ω and 1.75kΩ. These high power and low inductance resistors are designed for industrial and other applications where space is at a premium, the flat design also allows for excellent heat dissipation. The IRF150 series from RARA offers an extruded aluminium housing which provides strong and rugged protection, with options of cement or silicone filling materials as well as tolerances as low as ±0.5%. This resistor series offers a temperature range from -55°C up to +200°C (cement filling material).

  • Flat space saving metal clad wire wound resistor
  • Cement (standard) or silicone filling material with an extruded aluminium housing
  • 300mm flying leads 
  • Resistance ranges available between 1Ω and 1.75kΩ
  • TCR of +260 ppm/°C maximum
  • Tolerance values available of ±0.5%, ±1.0%, ±2.0%, ±5.0% and ±10.0%
  • Power rating of 150W (on a heat sink)
  • Insulation resistance of 20MΩ minimum
  • Temperature range between -55°C and +200°C (cement) or -55°C and +150°C (silicone)
  • Short time overload of 5 x power rating for 5 seconds

Typical applications for the IRF series include:

  • Motor drives
  • Braking and snubbing applications
  • Power sources for industrial equipment

The below table gives the specifications available for the IRF series including the IRF150 resistors:

RARA IRF100 Specifications

£0.00 Ex Tax: £0.00

RARA IRF200 Series

The IRF200 flat type metal clad wire wound resistor series from RARA, offers a power rating of up to 200W on a heat sink and available resistance values between 1Ω and 2.2kΩ. These high power and low inductance resistors are designed for industrial and other applications where space is at a premium, the flat design also allows for excellent heat dissipation. The IRF200 series from RARA offers an extruded aluminium housing which provides strong and rugged protection, with options of cement or silicone filling materials as well as tolerances as low as ±0.5%. This resistor series offers a temperature range from -55°C up to +200°C (cement filling material).

  • Flat space saving metal clad wire wound resistor
  • Cement (standard) or silicone filling material with an extruded aluminium housing
  • 300mm flying leads 
  • Resistance ranges available between 1Ω and 2.2kΩ
  • TCR of +260 ppm/°C maximum
  • Tolerance values available of ±0.5%, ±1.0%, ±2.0%, ±5.0% and ±10.0%
  • Power rating of 200W (on a heat sink)
  • Insulation resistance of 20MΩ minimum
  • Temperature range between -55°C and +200°C (cement) or -55°C and +150°C (silicone)
  • Short time overload of 5 x power rating for 5 seconds

Typical applications for the IRF series include:

  • Motor drives
  • Braking and snubbing applications
  • Power sources for industrial equipment

The below table gives the specifications available for the IRF series including the IRF200 resistors:

RARA IRF200 Specifications

£0.00 Ex Tax: £0.00

RARA IRF250 Series

The IRF250 flat type metal clad wire wound resistor series from RARA, offers a power rating of up to 250W on a heat sink and available resistance values between 1Ω and 2.79kΩ. These high power and low inductance resistors are designed for industrial and other applications where space is at a premium, the flat design also allows for excellent heat dissipation. The IRF250 series from RARA offers an extruded aluminium housing which provides strong and rugged protection, with options of cement or silicone filling materials as well as tolerances as low as ±0.5%. This resistor series offers a temperature range from -55°C up to +200°C (cement filling material).

  • Flat space saving metal clad wire wound resistor
  • Cement (standard) or silicone filling material with an extruded aluminium housing
  • 300mm flying leads 
  • Resistance ranges available between 1Ω and 2.79kΩ
  • TCR of +260 ppm/°C maximum
  • Tolerance values available of ±0.5%, ±1.0%, ±2.0%, ±5.0% and ±10.0%
  • Power rating of 250W (on a heat sink)
  • Insulation resistance of 20MΩ minimum
  • Temperature range between -55°C and +200°C (cement) or -55°C and +150°C (silicone)
  • Short time overload of 5 x power rating for 5 seconds

Typical applications for the IRF series include:

  • Motor drives
  • Braking and snubbing applications
  • Power sources for industrial equipment

The below table gives the specifications available for the IRF series including the IRF250 resistors:

RARA IRF250 Specifications

£0.00 Ex Tax: £0.00

RARA IRF300 Series

The IRF300 flat type metal clad wire wound resistor series from RARA, offers a power rating of up to 300W on a heat sink and available resistance values between 1Ω and 3.5kΩ. These high power and low inductance resistors are designed for industrial and other applications where space is at a premium, the flat design also allows for excellent heat dissipation. The IRF300 series from RARA offers an extruded aluminium housing which provides strong and rugged protection, with options of cement or silicone filling materials as well as tolerances as low as ±0.5%. This resistor series offers a temperature range from -55°C up to +200°C (cement filling material).

  • Flat space saving metal clad wire wound resistor
  • Cement (standard) or silicone filling material with an extruded aluminium housing
  • 300mm flying leads 
  • Resistance ranges available between 1Ω and 3.5kΩ
  • TCR of +260 ppm/°C maximum
  • Tolerance values available of ±0.5%, ±1.0%, ±2.0%, ±5.0% and ±10.0%
  • Power rating of 300W (on a heat sink)
  • Insulation resistance of 20MΩ minimum
  • Temperature range between -55°C and +200°C (cement) or -55°C and +150°C (silicone)
  • Short time overload of 5 x power rating for 5 seconds

Typical applications for the IRF series include:

  • Motor drives
  • Braking and snubbing applications
  • Power sources for industrial equipment

The below table gives the specifications available for the IRF series including the IRF300 resistors:

RARA IRF300 Specifications

£0.00 Ex Tax: £0.00

RARA IRF400 Series

The IRF400 flat type metal clad wire wound resistor series from RARA, offers a power rating of up to 400W on a heat sink and available resistance values between 1Ω and 4.45kΩ. These high power and low inductance resistors are designed for industrial and other applications where space is at a premium, the flat design also allows for excellent heat dissipation. The IRF400 series from RARA offers an extruded aluminium housing which provides strong and rugged protection, with options of cement or silicone filling materials as well as tolerances as low as ±0.5%. This resistor series offers a temperature range from -55°C up to +200°C (cement filling material).

  • Flat space saving metal clad wire wound resistor
  • Cement (standard) or silicone filling material with an extruded aluminium housing
  • 300mm flying leads 
  • Resistance ranges available between 1Ω and 4.45kΩ
  • TCR of +260 ppm/°C maximum
  • Tolerance values available of ±0.5%, ±1.0%, ±2.0%, ±5.0% and ±10.0%
  • Power rating of 400W (on a heat sink)
  • Insulation resistance of 20MΩ minimum
  • Temperature range between -55°C and +200°C (cement) or -55°C and +150°C (silicone)
  • Short time overload of 5 x power rating for 5 seconds

Typical applications for the IRF series include:

  • Motor drives
  • Braking and snubbing applications
  • Power sources for industrial equipment

The below table gives the specifications available for the IRF series including the IRF400 resistors:

RARA IRF400 Specifications

£0.00 Ex Tax: £0.00