The mounting thermoplastic dielectric sheet, which has a capacity of five voltage 12 VDC 10 A two discs and 12 VDC 6 A third disc using the cooling system with water. And were tested at room temperature 25◦C me is the cooling of a prototype small refrigerator thermostat to lower the temperature of the dielectric 26.2◦C temperature 10◦C takes 162 minutes. and their temperature is lowered to 180 minutes 9.7◦C duration electrical performance tests are used to analyze energy use and three-phase Power Quality The result is that when the voltage at 226.27 V refrigerator to eat. current 3.00 A Power Consumption 0.38 kW, with a power factor of 0.52, the result will be a key point in the design and development of the refrigerator thermostat dielectric further.