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 IRN50

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 RH25 (Inductive)

High Power Metal Clad Resistors
  • Inductive Metal clad wire wound resistor
  • Resistance range between 0.27Ω and 25kΩ
  • Insulation resistance of 20MΩ minimum
  • Temperature range of -55°C up to +250°C
  • Cement moulding within aluminium housing
  • Short time overload of 5 x power rating is 5 seconds
  • Mounts on chassis to utilise heat sink effect

RARA RH25 (Non-Inductive)

High Power Metal Clad Resistors
  • Non-Inductive Metal clad wire wound resistor
  • Resistance range between 0.1Ω and 10kΩ
  • Insulation resistance of 20MΩ minimum
  • Temperature range of -55°C up to +250°C
  • Cement moulding within aluminium housing
  • Short time overload of 5 x power rating is 5 seconds
  • Mounts on chassis to utilise heat sink effect

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RARA RH50 (Inductive)

High Power Metal Clad Resistors
  • Metal clad wire wound resistor
  • Resistance range between 0.68Ω and 50kΩ
  • Insulation resistance of 20MΩ minimum
  • Temperature range of -55°C up to +250°C
  • Cement moulding within aluminium housing
  • Short time overload of 5 x power rating is 5 seconds
  • Mounts on chassis to utilise heat sink effect

RARA RH50 (Non-Inductive)

High Power Metal Clad Resistors
  • Metal clad wire wound resistor
  • Resistance range between 0.2Ω and 20kΩ
  • Insulation resistance of 20MΩ minimum
  • Temperature range of -55°C up to +250°C
  • Cement moulding within aluminium housing
  • Short time overload of 5 x power rating is 5 seconds
  • Mounts on chassis to utilise heat sink effect

RARA SMF Series

Power Metal Film Chip Resistors
  • High-precision metal film surface-mount resistors
  • Power ratings available: 2W, 3W and 5W
  • Resistance range: 10Ω to 2MΩ
  • Tight tolerances: ±1% and ±5%
  • Temperature coefficient: 200 ppm/°C
  • Flameproof UL94V0 moulded package for added safety

RARA SMW Series

Power Wire Wound Chip Resistors
  • High-power wire wound surface-mount resistors
  • Power ratings available: 2W, 3W, and 5W
  • Wide resistance range: 0.1Ω to 500Ω
  • Precision tolerances: ±1% & ±5%
  • Temperature coefficient: 200 ppm/°C
  • Flameproof UL94V0 molded package for high safety

RARA UHPS

Ultra High Power Precision Shunt Resistor
  • 4-terminal shunt resistor
  • Resistance options of 0.2mΩ and 1mΩ
  • Tolerances of ±0.05% to ±1%
  • TCR of ±10 ppm/°C
  • Power rating of 100W (on a suitable heat sink)
  • Temperature range from -55°C to +100°C

RARA ULF100C

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 Non UL Approval see the IRF Series

RARA ULF150C

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 Non UL Approval see the IRF Series

RARA ULF200C

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 Non UL Approval see the IRF Series

RARA ULF250C

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 Non UL Approval see the IRF Series

RARA ULF300C

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 Non UL Approval see the IRF Series

RARA ULF400C

Flat Type Metal Clad Wire Wound Resistors
  • Flat type metal clad wire wound resistor
  • Resistance options from 1Ω up to 3.08kΩ
  • Power rating of 400W (on a heat sink)
  • Tolerance options between ±0.5% and ±10.0%
  • TCR of +260 ppm/°C maximum
  • For Non UL Approval see the IRF Series

RARA ULF500C

Flat Type Metal Clad Wire Wound Resistors
  • Flat type metal clad wire wound resistor
  • Resistance options from 1Ω up to 2.46kΩ
  • Power rating of 500W (on a heat sink)
  • Tolerance options between ±0.5% and ±10.0%
  • TCR of +260 ppm/°C maximum
  • For Non UL Approval see the IRF Series

RARA ULH100F

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
  • UL Approved

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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.