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What are the operation limits for "shunt" opening release of our MV circuit breakers?

According to IEC 62271-1,  shunt opening release shall operate correctly under all operating conditions of the switching device up to its rated short-circuit breaking current, and between 70 % in the case of d.c. – or 85 % in the case of a.c. – and 110 % of the rated supply voltage of the opening device, the frequency in the case of a.c. being the rated supply frequency of the opening device.
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