Inside Transformer Windings Coil PTC thermistor (3) Kilowatt-hour Meter Overload PTC Protection (16) Measuring Instrument Overload Short Circuit Protection PTC (9) Outside Transformer Windings Coil PTC thermistor (25) PTC Heater Chips (5) PTC Resettable Fuse (61) PTC Sensor Metal Probe Assembly (15) PTC Sensor Radial Leaded Resin Coated (12) PTC Thermistor Leaded disks coated (60) PTC Thermistor Thermal Protection (26) Threaded NTC Sensor (3) Transformer Overload Protection PTC (31)