1/9/2009 12:58 PM | |
Posts: 467 Rating: (59)
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Hello BulentO, The Ir/ Ii setting depends on customer´s application. We can't give you any accurate value. Our general statement about Ir and Ii setting is: #################### The Ir of the circuit-breaker should be set to the nominal current of the motor to provide optimal protection. #################### The setting of the short-circuit trip protection must be so carried out as to fulfill the protection requirements of IEC standards. The tripping value of the short circuit protection should be set at least 20% lower than the lowest expected short-circuit current value on the installation. At the same time, the setting should be 20% higher than the highest value of normal operating current. This ensures that at the lowest expected short circuit current, the MCCB will trip within the times laid down in IEC standards and at the same time nuisance tripping at normal rated currents is avoided. |
1/13/2009 11:38 AM | |
Posts: 262 Rating: (45) |
you should start using the SIMARIS Design Software; which gives you all the ratings of the fault level and the selection of correct products. |
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