RARA ULF250C

Specifications

Weight 290.00000 kg
Dimensions 10.00 x 80.00 x 180.00mm
Product Type

, ,

Series / Model

Power Rating

Minimum Resistance

Maximum Resistance

Tolerance

, , , ,

Temperature Coefficient

Insulation Resistance

20MΩ minimum

Filling Material

,

Temperature Range (°C)

,

RARA ULF250C

Clear
Quantity
  • Compliant

Series Products

Electronic Components

RARA ULF250C Series Products
 Product nameDimensionsPower RatingMinimum ResistanceMaximum ResistanceToleranceTemperature CoefficientDatasheetAdd to enquiry
RARA IRN/ULN/IRF/ULF Flat Type Metal Clad Wire Wound Resistors RARA ULF100C10.00 x 80.00 x 90.00mm100W1.1kΩ±0.5%, ±1%, ±2%, ±5%, ±10%±260 ppm/°C Add to Enquiry
RARA IRN/ULN/IRF/ULF Flat Type Metal Clad Wire Wound Resistors RARA ULF150C10.00 x 80.00 x 120.00mm150W1.75kΩ±0.5%, ±1%, ±2%, ±5%, ±10%±260 ppm/°C Add to Enquiry
RARA IRN/ULN/IRF/ULF Flat Type Metal Clad Wire Wound Resistors RARA ULF200C10.00 x 80.00 x 150.00mm200W2.2kΩ±0.5%, ±1%, ±2%, ±5%, ±10%±260 ppm/°C Add to Enquiry
RARA IRN/ULN/IRF/ULF Flat Type Metal Clad Wire Wound Resistors RARA ULF250C10.00 x 80.00 x 180.00mm250W2.79kΩ±0.5%, ±1%, ±2%, ±5%, ±10%±260 ppm/°C Add to Enquiry
RARA IRN/ULN/IRF/ULF Flat Type Metal Clad Wire Wound Resistors RARA ULF300C10.00 x 80.00 x 210.00mm300W3.5kΩ±0.5%, ±1%, ±2%, ±5%, ±10%±260 ppm/°C Add to Enquiry
RARA IRN/ULN/IRF/ULF Flat Type Metal Clad Wire Wound Resistors RARA ULF400C10.00 x 80.00 x 270.00mm400W3.08kΩ±0.5%, ±1%, ±2%, ±5%, ±10%±260 ppm/°C Add to Enquiry
RARA IRN/ULN/IRF/ULF Flat Type Metal Clad Wire Wound Resistors RARA ULF500C10.00 x 80.00 x 330.00mm500W2.46kΩ±0.5%, ±1%, ±2%, ±5%, ±10%±260 ppm/°C Add to Enquiry

ULF Series Description

The ULF series from RARA represents a pinnacle in resistor design, boasting a robust metal-clad, wirewound construction that stands out in high-power industrial applications. Encased in an extruded aluminum housing, this series not only ensures rugged protection but also secures UL approval, signifying compliance with stringent safety standards. This UL certification enhances the reliability of the ULF resistors, making them a trusted choice for demanding environments.

In terms of specific features, the ULF resistors showcase a compact and flat design, optimising space utilisation without compromising performance. This unique form factor facilitates excellent heat dissipation, a crucial aspect in industrial settings. With a notable power rating of up to 500W when mounted on a heat sink, these resistors cover a broad resistance range from 1Ω to 2.46kΩ. Customers can tailor their choice between cement or silicone filling materials based on specific application requirements. Operating effectively over a wide temperature range, from -55℃ to 200℃ for cement and -55℃ to 150℃ for silicone, these resistors maintain precise performance. The ULF series exhibits exceptional tolerances as low as ±0.5% and a maximum Temperature Coefficient of Resistance (TCR) of ±260ppm/℃, ensuring reliable and accurate operation in diverse industrial scenarios.

For those seeking a non-UL approved option with similar precision and reliability, the IRF series provides an alternative within RARA's resistor lineup. Although lacking UL approval, the IRF series shares the outstanding features of its ULF counterpart, making it a viable choice for applications where this certification may not be a primary requirement.

RARA ULF250C Ordering Info

Below is the model number configuration for the ULF series from RARA.
Ordering example:
ULFXXXXXXXXΩXFLXXX

Series / Model (ULFXXX)

ULF250C

Filling Material (X)

C
Cement
S
Silicone

Resistance Value (XXXXΩ)

Resistance value expressed in ohms, for example 0.5Ω or 225.5Ω.

Tolerance (X)

D
±0.5%
F
±1%
G
±2%
J
±5%
K
±10%

Termination (FLXXX)

FL XXX      Flying Lead **
(Blank)  Tab Terminal

* Please include required lead length with quote request, for example, FL300 for 300mm flying leads.
Thermostat options are available for these models. Please speak to an engineer for more information.

ULF Downloads

Supporting Manufacturer Information

  • RARA
RARA IRN/ULN/IRF/ULF Flat Type Metal Clad Wire Wound Resistors

RARA ULF250C

Please be advised that due to the ongoing supply issues with raw materials affecting the global electronics industry, as well as an increase in orders received by our manufacturing partners, a large number of products are facing increased lead times in recent months. For the latest lead time and stock availability, please contact one of our engineers who will be happy to discuss lead times further and the potential for alternative parts.