This defrost sensor assembly (part number 4781JK2001A) is for refrigerators. Defrost sensor assembly 4781JK2001A monitors the temperature of the evaporator coil to prevent it from overheating. The assembly includes the defrost sensor, fuse and wire harness. Safely store any food that could deteriorate while the power is off. Unplug the refrigerator before installing this part. Wear work gloves to protect your hands.