3UF5 SIMOCODE-DP System Motor Protection and Control Device

The 3UF50 Basic UnitTripping classes, specified times, thermal memoryClassThe class (tripping class) indicates the maximum tripping time in which aprotection device has to trip from cold at 7.2 times the Set Current (motorprotection according to IEC 60947). The tripping characteristics show thetripping time in relation to the tripping current.1201005012010050Deratings min201052150201051510CLASS 52x I s10,7 1 2 5 83-pole symmetrical loadt ACLASS 302520Fig. 19: Tripping characteristics (cold)s min1015510CLASS 52x I s10,7 1 2 5 82-pole load(failure of a phase or currentasymmetry > 40 %)Bear in mind that, for starts > Class 10, the permissible AC3 current of themotor contactor has to be reduced (derating). The data (rated operatingcurrents Is [A] /AC-3) are given in Appendix D.5.20105215020t ACLASS 302520GWA 4NEB 631 4286-02a 2-11