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We’re Exhibiting at EDS 2025
The Engineering Design Show, 8 – 9 October 2025, Coventry Building Society Arena, UK, Stand J3
The ULF500C flat type metal clad wire wound resistor series from RARA, offers a power rating of up to 500W on a heat sink and available resistance values between 1Ω and 2.46kΩ. These UL approved 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 ULF500C series from RARA offers an extruded aluminium housing providing strong and rugged protection, with cement filling material as well as tolerances as low as ±0.5%. This resistor series offers a temperature range from -55°C up to +200°C.
Typical applications for the ULF series include:
| Weight | 525.00000 kg |
|---|---|
| Dimensions | 10.00 x 80.00 x 330.00mm |
| Product Type | |
| Series / Model | |
| Power Rating | |
| Filling Material | Cement, Silicone |
| Insulation Resistance | 20MΩ minimum |
| Minimum Resistance | 1Ω |
| Maximum Resistance | 2.46kΩ |
| Tolerance | |
| Temperature Coefficient | |
| Temperature Range (°C) | -55 to +150°C (Silicone), -55 to +200°C (Cement) |
ULF500C
Resistance value expressed in ohms, for example 0.5Ω or 225.5Ω.
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.
| SKU | Filling Material | Resistance Value | Lead Length | Tolerance |
|---|---|---|---|---|
| RARA ULF500C Series | Custom (1Ω - 2.46kΩ) | ±0.5% | ||
| RARA ULF500C Series | Custom (1Ω - 2.46kΩ) | ±1% | ||
| RARA ULF500C Series | Custom (1Ω - 2.46kΩ) | ±10% | ||
| RARA ULF500C Series | Custom (1Ω - 2.46kΩ) | ±2% | ||
| RARA ULF500C Series | Custom (1Ω - 2.46kΩ) | ±5% |
| Product name | Dimensions | Power Rating | Minimum Resistance | Maximum Resistance | Tolerance | Temperature Coefficient | Datasheet | ||
|---|---|---|---|---|---|---|---|---|---|
| RARA ULF100C | 10.00 x 80.00 x 90.00mm | 100W | 1Ω | 1.1kΩ | ±0.5%, ±1%, ±2%, ±5%, ±10% | ±260 ppm/°C | View Product | |
|
| RARA ULF150C | 10.00 x 80.00 x 120.00mm | 150W | 1Ω | 1.75kΩ | ±0.5%, ±1%, ±2%, ±5%, ±10% | ±260 ppm/°C | View Product | |
|
| RARA ULF200C | 10.00 x 80.00 x 150.00mm | 200W | 1Ω | 2.2kΩ | ±0.5%, ±1%, ±2%, ±5%, ±10% | ±260 ppm/°C | View Product | |
|
| RARA ULF250C | 10.00 x 80.00 x 180.00mm | 250W | 1Ω | 2.79kΩ | ±0.5%, ±1%, ±2%, ±5%, ±10% | ±260 ppm/°C | View Product | |
|
| RARA ULF300C | 10.00 x 80.00 x 210.00mm | 300W | 1Ω | 3.5kΩ | ±0.5%, ±1%, ±2%, ±5%, ±10% | ±260 ppm/°C | View Product | |
|
| RARA ULF400C | 10.00 x 80.00 x 270.00mm | 400W | 1Ω | 3.08kΩ | ±0.5%, ±1%, ±2%, ±5%, ±10% | ±260 ppm/°C | View Product | |
|
| RARA ULF500C | 10.00 x 80.00 x 330.00mm | 500W | 1Ω | 2.46kΩ | ±0.5%, ±1%, ±2%, ±5%, ±10% | ±260 ppm/°C | View Product |
