Metal Clad Wire Wound Resistors

The ULM800 metal clad wire wound resistor series from RARA offers a power rating of up to 800W on a heat sink (360W in free air) with available resistance values between 0.1Ω and 112Ω (inductive design) or between 0.1Ω and 28.8Ω (non-inductive design). These high power resistors are UL approved and are available with tolerances of ±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 ULM800 series from RARA are a metal cover type with an extruded aluminium housing providing strong and rugged protection all with a temperature range from -55°C up to +200°C

• Metal clad wire wound resistor
• Option of flying leads, parallel or series terminal connections
• Inductive resistance ranges available between 0.14Ω and 112Ω (flying leads), 0.1Ω and 11Ω (parallel tab terminal connection) or 11.1Ω and 112Ω (serial tab terminal connection)
• Non-inductive resistance ranges available between 0.14Ω and 28.8Ω (flying leads), 0.1Ω and 7.2Ω (parallel terminal connection) or 7.3Ω and 28.8Ω (serial terminal connection)
• TCR of +260 ppm/°C maximum
• Tolerance values available of ±1.0%, ±2.0%, ±5.0% and ±10.0%
• Power rating of 800W on a heat sink (360W in free air)
• Insulation resistance of 20MΩ minimum
• UL approved
• Metal cover type with an extruded aluminium housing
• Temperature range between -55°C and +200°C
• Short time overload of 10 x power rating for 5 seconds

Typical applications for the ULM series include:

• Motor drives
• Braking and snubbing applications
• Power sources for industrial equipment