Resistors

Current Sensing & Low Resistance Resistors (129)

Low-ohmic resistors used as the sensing element, where the voltage across a known resistance is the measurement. Four-terminal construction, low temperature coefficient and low thermal EMF keep a milliohm-level reading honest. Specified as shunts in battery and power supply monitoring.

Precision / Ultra-Precision Resistors (126)

Resistors specified by tolerance, temperature coefficient and long-term stability rather than by power rating. Used in instrumentation front ends, references and calibration circuits, where drift over years is the property that decides the design.

Load Banks (89)

Resistive load banks that dissipate a controlled amount of power so a supply or converter can be tested under load. Rated by continuous power, resistance range and cooling method.

Non-Magnetic Resistors (64)

Resistors made without ferromagnetic material, so they neither distort a magnetic field nor move within one. Intended for magnetic resonance imaging, precision instrumentation and any assembly sitting inside a measured field.

Z Foil resistors (56)

Bulk metal foil resistors, holding temperature coefficient, load-life drift and thermal EMF to very low levels, with coefficients down to ±0.2ppm/°C on selected series. Used in metrology, automatic test equipment and space-qualified work.

High-Temperature Resistors (36)

Resistors qualified for high ambient and high surface temperature, in precision and power constructions. Derating curve, terminal material and mounting method carry more weight here than the room-temperature specification.

Power Resistors (33)

Resistors for higher dissipation, in several mounting styles and across a wide resistance span. The thermal path is as much part of the specification as the resistance value, because the rating depends on how the heat leaves the part.

Networks & Voltage Dividers (22)

Resistor networks and voltage dividers where the ratio between elements matters more than the absolute value. Matched and tracking configurations hold that ratio across temperature, for references, instrumentation amplifiers and precision measurement.

High-Voltage Resistors (21)

Resistors rated by voltage as well as by power, for measurement dividers, discharge paths and high-voltage supply control. Creepage, tracking resistance and voltage coefficient are the properties that decide whether the part survives the application.

Standard Resistors (9)

General-purpose resistors in common values, tolerances and packages, for the parts of a design where the resistor is not the critical element.

Thermosensitive Resistors (7)

Resistors whose resistance changes predictably with temperature, used deliberately as a compensating element rather than held stable against it. For temperature measurement, bias compensation and thermal protection in analogue and power circuits.

RARA IRB60

Metal Clad Economy Resistors
  • Metal clad wire wound economy resistor
  • Inductive resistance between 0.1Ω and 270Ω
  • Non-inductive resistance between 0.1Ω and 56Ω
  • Power rating of 60W
  • Insulation resistance of 20MΩ minimum
  • Short time overload of 5 x power rating is 5 seconds

RARA IRB80

Metal Clad Economy Resistors
  • Metal clad wire wound economy resistor
  • Inductive resistance between 0.1Ω and 910Ω
  • Non-inductive resistance between 0.1Ω and 110Ω
  • Power rating of 80W
  • Insulation resistance of 20MΩ minimum
  • Short time overload of 10 x power rating is 5 seconds

RARA IRF100

Flat Type Metal Clad Wire Wound Resistors
  • Flat type metal clad wire wound resistor
  • Resistance options from 1Ω up to 1.1kΩ
  • Power rating of 100W (on a heat sink)
  • Tolerance options between ±0.5% and ±10.0%
  • TCR of +260 ppm/°C maximum
  • For UL Approval see the ULF Series

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RARA IRF150

Flat Type Metal Clad Wire Wound Resistors
  • Flat type metal clad wire wound resistor
  • Resistance options from 1Ω up to 1.75kΩ
  • Power rating of 150W (on a heat sink)
  • Tolerance options between ±0.5% and ±10.0%
  • TCR of +260 ppm/°C maximum
  • For UL Approval see the ULF Series

RARA IRF200

Flat Type Metal Clad Wire Wound Resistors
  • Flat type metal clad wire wound resistor
  • Resistance options from 1Ω up to 2.2kΩ
  • Power rating of 200W (on a heat sink)
  • Tolerance options between ±0.5% and ±10.0%
  • TCR of +260 ppm/°C maximum
  • For UL Approval see the ULF Series

RARA IRF250

Flat Type Metal Clad Wire Wound Resistors
  • Flat type metal clad wire wound resistor
  • Resistance options from 1Ω up to 2.79kΩ
  • Power rating of 250W (on a heat sink)
  • Tolerance options between ±0.5% and ±10.0%
  • TCR of +260 ppm/°C maximum
  • For UL Approval see the ULF Series

RARA IRF300

Flat Type Metal Clad Wire Wound Resistors
  • Flat type metal clad wire wound resistor
  • Resistance options from 1Ω up to 3.5kΩ
  • Power rating of 300W (on a heat sink)
  • Tolerance options between ±0.5% and ±10.0%
  • TCR of +260 ppm/°C maximum
  • For UL Approval see the ULF Series

RARA IRF400

Flat Type Metal Clad Wire Wound Resistors
  • Flat type metal clad wire wound resistor
  • Resistance options from 1Ω up to 4.45kΩ
  • Power rating of 400W (on a heat sink)
  • Tolerance options between ±0.5% and ±10.0%
  • TCR of +260 ppm/°C maximum
  • For UL Approval see the ULF Series

RARA IRF500

Flat Type Metal Clad Wire Wound Resistors
  • Flat type metal clad wire wound resistor
  • Resistance options from 1Ω up to 5.78kΩ
  • Power rating of 500W (on a heat sink)
  • Tolerance options between ±0.5% and ±10.0%
  • TCR of +260 ppm/°C maximum
  • For UL Approval see the ULF Series

RARA IRH100F

Metal Clad Wire Wound Resistors
  • Precision shunt resistor
  • 4-terminal metal-clad design
  • Resistance value of 1.3333mΩ
  • Rated current of 75A
  • Tolerance values of ±0.1, ±0.5% or ±1.0%
  • Rated voltage 100mV
  • Temperature range of -25°C to +100°C

RARA IRH200F

Metal Clad Wire Wound Resistors
  • Precision shunt resistor
  • 4-terminal metal-clad design
  • Resistance values between 0.4mΩ up to 1.3333mΩ
  • Rated currents from 100A up to 250A
  • Tolerance values of ±0.1, ±0.5% or ±1.0%
  • Rated voltage 100mV
  • Temperature range of -25°C to +100°C

RARA IRH300F

Metal Clad Wire Wound Resistors
  • Precision shunt resistor
  • 4-terminal metal-clad design
  • Resistance values between 0.1250mΩ up to 0.3333mΩ
  • Rated currents from 300A up to 500A
  • Tolerance values of ±0.1, ±0.5% or ±1.0%
  • Rated voltages of 50mV or 100mV
  • Temperature range of -25°C to +100°C

RARA IRH80F

Metal Clad Wire Wound Resistors
  • Precision shunt resistor
  • 4-terminal metal-clad design
  • Resistance values between 1.3333mΩ up to 3.3333mΩ
  • Rated current of 30A, 40A, 50A or 75A
  • Tolerance values of ±0.1%, ±0.5% or ±1.0%
  • Rated voltage 100mV
  • Temperature range of -25°C to +100°C

RARA IRM2800

Metal Clad Wire Wound Resistors
  • Metal clad wire wound resistor
  • Resistance options from 0.7Ω up to 135Ω
  • Power rating of up to 750W (free air)
  • Tolerance options between ±1% and ±10.0%
  • TCR of +260 ppm/°C maximum
  • For UL Approval see the ULM

RARA IRN100

Flat Type Metal Clad Wire Wound Resistors
  • Flat and narrow type metal clad wire wound resistor
  • Cement or silicone filling material with an extruded aluminium housing
  • 300mm flying leads
  • Excellent heat dissipation
  • Insulation resistance of 20MΩ minimum
  • Temperature range of -55°C up to +200°C (cement) / +150°C (silicone)
  • Short time overload of 5 x power rating is 5 seconds

RARA IRN150

Flat Type Metal Clad Wire Wound Resistors
  • Flat and narrow type metal clad wire wound resistor
  • Cement or silicone filling material with an extruded aluminium housing
  • 300mm flying leads
  • Excellent heat dissipation
  • Insulation resistance of 20MΩ minimum
  • Temperature range of -55°C up to +200°C (cement) / +150°C (silicone)
  • Short time overload of 5 x power rating is 5 seconds

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Resistors

Resistors run across twelve sub-categories: precision and ultra-precision, Z-foil, current sensing and low resistance, high-voltage, high-temperature, high-energy, non-magnetic, power, standard, thermosensitive, networks and voltage dividers, then load banks. Custom values are available on several lines.