jameel Posted February 3, 2009 Report Share Posted February 3, 2009 WE are using a 63A MCCB(SIEMENS MAKE) for one of the feeder in LV substation panel.It is supplying to a lighting & power socket DB.Settings in the MCCB is Ir = 63 * 1 , Isd = 8 times of Ir , tsd = 0.5 sec( I2 t off). Sometimes this MCCB is tripping .But no trip in DB MCB. Can anybody tell me reason ? From where i can know about the MCCB settings? Link to comment Share on other sites More sharing options...
pft77 Posted June 20, 2009 Report Share Posted June 20, 2009 WE are using a 63A MCCB(SIEMENS MAKE) for one of the feeder in LV substation panel.It is supplying to a lighting & power socket DB.Settings in the MCCB is Ir = 63 * 1 , Isd = 8 times of Ir , tsd = 0.5 sec( I2 t off). Sometimes this MCCB is tripping .But no trip in DB MCB. Can anybody tell me reason ? From where i can know about the MCCB settings? do you have current injector ? if you do, you may test the mccb by injecting 63A. Link to comment Share on other sites More sharing options...
jsl Posted September 14, 2009 Report Share Posted September 14, 2009 WE are using a 63A MCCB(SIEMENS MAKE) for one of the feeder in LV substation panel.It is supplying to a lighting & power socket DB.Settings in the MCCB is Ir = 63 * 1 , Isd = 8 times of Ir , tsd = 0.5 sec( I2 t off). Sometimes this MCCB is tripping .But no trip in DB MCB. Can anybody tell me reason ? From where i can know about the MCCB settings? there could be many reasons for tripping 1 if the cummulative output current (all lights and sockets etc) exceeds 63 amps 2 if your had a circuit that required a large inrush current (motor or transformer etc) 3 Link to comment Share on other sites More sharing options...
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