I'd say the effect described in
Cynthia Cline's paper is not as pronounced in breakers as it is noticeable in fuses. Only the upper-left (short and long time-delay, typically 1sec+ ) portion of circuit breaker trip curve displays the breaker’s thermal response. The lower right portion of the curve displays magnetic response of the circuit breaker. The magnetic trip is activated not by heat related to RMS current value but by the instantaneous current approaching steady state in approximately 5 time constants (compare to 20X time constants for RMS or heating effect of the current to achieve its steady state value). Also, one should take into account the breaker rated time constant and compare it to the circuit time constant. Same observation also applies to DC rated fuses where the fuse rated DC voltage is associated with some time constant value, and for time constants exceeding that (normally published, typically 10msec) value the fuse DC voltage capabilities vs. time constant chart should be consulted.