Answer Posted / deepak tyagi

IN 3-PHASE INDUCTION MOTOR ACTIVE POWER IS CONVERTED INTO
MECHNICAL POWER THIS MEAN THAT ACTIVE POWER IS ONE WHICH WE
USE AND IT IS EQUAL TO THE VICOSQ. REACTIVE POWER IS ONE
WHICH GENERATE THE MAGNETIC FIELD IN MACHINE. TOTAL POWER
DRAWAN BY THE MACHINE IS CALLED APPERNT POWER.

WE ARE PLACE A NEW 75 KW MOTOR FOR JPF.IT IS CONNECTED IN M.C.C. WHEN WE ARE STARTING M.C.C.INCOMER IS TRIPPED.THEN WE ARE CONNECTED IN P.C.C WITH A MM30 RELAY PROTECTION THEN WE ARE STARTED MOTOR WILL RUN SMOOTHLY.

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I have an existing old MCCB. ABB Model SACE, the rating are: Ue = 660 volts, Iu =1250 Amps, 3 poles, Ith (max) =800 amps at 45 deg C. I need a circuit breaker for my 3 phase motors, 380 volts 60 hz. the supplier required the minimum ampacity of the breaker to be 911 amps. can i use this breaker with rating of Iu =1250 amps but Ith = 800amps maximum?

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