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Question
what factors to needed while selecting a MCB and MCCB
 Question Submitted By :: Electrical-Engineering
I also faced this Question!!     Answer Posted By  
 
Answer
# 1
while selecting the MCB u have to check:
1) Current Rating.
2) Response Time.
3) Manufacturer.
4) Type of MCB (mens single pole,double pole, three pole,
four pole). depends on application.
5) Cost.
 
Is This Answer Correct ?    17 Yes 0 No
Vikramsenareddy
 
Answer
# 2
in addition to the above point below factors also taken
into account.
1. short circuit breaking capacity.
 
Is This Answer Correct ?    14 Yes 0 No
Dnyaneshwar
 
 
 
Answer
# 3
in addition to the above point below factors also taken
into account.
time delay.
short circuit breaking capacity.
frequency
temperature response.
 
Is This Answer Correct ?    5 Yes 0 No
Roushan.eee
 

 
 
 
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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?   5
why grid failure happens?   1
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