WR51X10055 can melt the ice and around the coil and store the food better WR55X10025 sensor is to send the current temperature readings to the control board WR50X10068 cut off the power when the defrost temperature reaches a certain Made from metal, it includes a temperature sensor and defrost thermostat for effective and efficient Say goodbye to buildup in your fridges with this essential defrost heating kit Enjoy peace of mind knowing that your fridges are always functioning at its best with this defrost heating part Great for anyone who wants to keep their fridges running smoothly and efficiently Perfect for use in both residential and commercial settings