Electronic Components

RARA ULF250C Series Products

	Product name	Dimensions	Power Rating	Minimum Resistance	Maximum Resistance	Tolerance	Temperature Coefficient	Datasheet	Add to enquiry
	RARA ULF100C	10.00 x 80.00 x 90.00mm	100W	1Ω	1.1kΩ	±0.5%, ±1%, ±2%, ±5%, ±10%	±260 ppm/°C		Add to Enquiry
	RARA ULF150C	10.00 x 80.00 x 120.00mm	150W	1Ω	1.75kΩ	±0.5%, ±1%, ±2%, ±5%, ±10%	±260 ppm/°C		Add to Enquiry
	RARA ULF200C	10.00 x 80.00 x 150.00mm	200W	1Ω	2.2kΩ	±0.5%, ±1%, ±2%, ±5%, ±10%	±260 ppm/°C		Add to Enquiry
	RARA ULF250C	10.00 x 80.00 x 180.00mm	250W	1Ω	2.79kΩ	±0.5%, ±1%, ±2%, ±5%, ±10%	±260 ppm/°C		Add to Enquiry
	RARA ULF300C	10.00 x 80.00 x 210.00mm	300W	1Ω	3.5kΩ	±0.5%, ±1%, ±2%, ±5%, ±10%	±260 ppm/°C		Add to Enquiry
	RARA ULF400C	10.00 x 80.00 x 270.00mm	400W	1Ω	3.08kΩ	±0.5%, ±1%, ±2%, ±5%, ±10%	±260 ppm/°C		Add to Enquiry
	RARA ULF500C	10.00 x 80.00 x 330.00mm	500W	1Ω	2.46kΩ	±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.

ULF Downloads

• RARA IRN, ULN, IRF & ULF Datasheet

Supporting Manufacturer Information

• RARA Product Brochure