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They are designed to respond to the heat generated by the true-RMS value of the load current. I wonder what's coming next. At severe levels of harmonic currents, the neutral currents may exceed the phase currents. No longer do you have the assurance that the number displayed on your ringing telephone actually represents the person on the other end of the line. JPF is especially suitable to find hard-to-test concurrency defects in multithreaded programs. The most common effect of these types of harmonics noticed by a thermographer in a three-phase four-wire system is the uneven heating of transformer windings as seen in the IR and visual image below. Accuracy in temperature measurement is of paramount importance since many companies utilize infrared data to determine safe operating limits for in-service heaters. They basically trip the circuit off-line when the breaker senses that the design maximum temperature has been exceeded.