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How can I find the threshold of the instantanoeus self protection release added to the breaker by the OEM in case Icu ( short circuit capacity ) is higher than Icw ( short time withstand capacity )?

We do not have a general guide for setting the circuit breakers, except the information what we have on the user manual / leafelets supplied along with them, and the settings depend totally on the end user requirements.
To see the behaviour of the settings a quick and simple way is to visualise them by plotting the curves through our Curve Direct software (link given below)

http://www.schneider-electric.com/download/ww/en/details/28979363-Curve-Direct-341/?reference=CurveDirect-341_EN
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