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Sizing Circuit Breakers for Self-Regulating Heat Tracers

From Thermon Manufacturing Co.

Circuit breaker sizing for S/R tracers is quite easily accomplished by using the specification sheet data or CompuTrace® heat tracing design software. However, sometimes an engineer or designer asks "What is the technical basis for sizing data and the resulting design values?" This ThermoTip is intended to show the technical basis on how circuit breaker sizing is accomplished. Key factors in proper sizing are: (1) the specified start-up temperature, (2) the circuit breaker type
and ampacity rating, (3) the specific S/R tracer start-up characteristic, and (4) the total length of heat tracer connected to the circuit breaker.

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