Nelson Heat Trace microprocessor based circuit management systems provide both temperature control and monitoring of heat tracing circuits. They help prevent equipment damage and operational disruption by communicating information such as temperature alarms, circuit faults, sensor failure and communication failures. Automatic test cycles can energize the circuits according to a programmed schedule in order to detect developing fault conditions. Single point and multiple circuit systems are available with a choice of enclosures, and systems can be networked to a PC for centralized monitoring and control.