Alstom's 2 o/c and 1 e/f Relay Setting

In our plant alstom made cdg61 type 2o/c &1 e/f relay is installed...feeder ct ratio is 3200/5 A...o/c relay varies from 2.5 to 10 amp...presently the p.s.m. Is in 2.5 amp...for this setting at what current the relay operates...thanks in advance

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