Justin, The resistance is an inverse function of current. The higher the current, the lower the resistance and the cooler the temperature. When you select these devices you want the maximum current rating of the device to be within 85-90% of the maximum that motor might draw under load. Most of these devices have near zero resistance at full current rating. From experience with their use in other devices I can tell you they run pretty cool. I tried a number of different models before settling on the CL150 and CL160s. They are fairly inexpensive though higher than I when I bought mine. Try playing with them.
Pete
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