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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?
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Answer Posted / abdul
HI Friend,
I think there must be a earth leakage in your receiving end.
Always the MCB trips for Short circit,where as the MCCB
trips for both earth leakage & short circuit.
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