Metal Clad Wire Wound Resistors

The ULH120 metal clad wire wound resistor series from RARA offers a power rating of up to 120W on a heat sink (96W in free air) with available resistance values between 0.1Ω and 1.3kΩ (inductive design) or between 0.1Ω and 300Ω (non-inductive design). These high power resistors are available being UL approved and with tolerances of ±0.5%, ±1.0%, ±2.0%, ±5.0% and ±10.0% as standard with other options available including flying leads or tab terminals, as well as inductive or non-inductive resistive windings. The ULH120 series from RARA has an extruded aluminium horizontal housing providing strong and rugged protection all with a temperature range from -55°C up to +200°C

• Metal clad wire wound resistor
• Inductive resistance range available between 0.1Ω and 1.3kΩ (flying leads) or 0.1Ω and 187Ω (tab terminals)
• Non-inductive resistance range available between 0.1Ω and 300Ω (flying leads) or 0.1Ω and 187Ω (tab terminals)
• Option of flying leads (tab terminals are standard)
• TCR of +260 ppm/°C maximum
• Tolerance values available of ±0.5%, ±1.0%, ±2.0%, ±5.0% and ±10.0%
• Power rating of 120W on a heat sink (96W in free air)
• Insulation resistance of 20MΩ minimum
• Temperature range between -55°C and +200°C
• UL approved
• Short time overload of 10 x power rating for 5 seconds

Typical applications for the ULH series include:

• Motor drives
• braking and snubbing applications
• Charging for electric vehicles
• Power sources for industrial equipment

The below table gives the specifications available for the ULH series including the ULH120 resistors:

The dielectric withstanding voltage options available are AC1500V, 3500V, 4500V and 5400V for 1 minute and also available in extended ohmic ranges from 0.001Ω up to 750kΩ please contact us for further details.