The run capacitor is attached to the compressor. This part is 120 volts and 15 mfd. The run capacitor helps the compressor kick on and off while maintaining a constant temperature to keep things frozen in your freezer. If your refrigerator is too warm, will not start, or your freezer section is too warm, you may need to replace this part. This is a genuine OEM part. Please remember to disconnect power to your refrigerator before starting your repair.