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WCR500 WATER COOLED
HIGH POWER RESISTORS

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INTRODUCTION
These are 500W & 1000W high power resistors exhibiting very low operating temperatures. These models
offer very low inductance and high surge handling capacity. They consist of a flat resistive element
with twisted air leads. A 5Kv dielectric strength is ensured with an alumina substrate. The low operating
temperature of the element gives a low failure rate in high-density, compact instruments and equipment.
These models can be used in snubber resistors, GTO and IGBT in electric power conversion systems.

SPECIFICATIONS AND CHARACTERISTICS                      Values in [ ] mean change in ohmic value after test

Rated Power WCR500: 500W (water cooling), WCR1000: 1000W (water cooling)
Resistance Range

10, 20, 40 120 ohms

T.C.R 250ppm/C
Resistance Tolerance 10%
Dielectric Strength 2000VAC, Between terminals and fin
Max. Water Pressure 6kg/cm squared
Volume of water flow 6 litres/min
Std. Water tamp. 41C
Min. water temp. Over dew point
Water temp. rise 1.4C, At outlet (power rating)
Fin temp. rise 14.0C, on the M5 tapping screw. (rated power)
Surface temp. rise 50.0C, On the Heat sink surface Resistor surface temperature. (rated power)
Max. surf. Temp 110C, On the element surface
Pressure loss 0.06 kg/cm squared
Weight 355g

 

 

 

 

 

 


DIMENSIONS

 

Surface Temperature Rise VS Power Rating & Load Life

   

Surface Temperature Rise VS Power Rating & Load Life

 

Cooling Water Temperature Rise VS Power Rating

 

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Tel:82-32-817-4325 Fax:82-32-817-4329

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