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<p>Circuit breakers have what is called an instantaneous trip and a delay trip.  Yes you can exceed the rated capacity for short periods.  The idea being that you dont want small short (time) duration spurious conditions to trip things off.  You do want it to trip instantaneously when a high inrush condition occurs (as in a short circuit).   Typically "things" are designed to somewhere around 150% of their nameplate rating.  This provides you with a margin to safety.  Operate at the nameplate rating of the device, not the technological limit.  </p>
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