How to select MCCB or MCB for Motor ?
The selection depends upon the starting method
1 . In case of DOL starting method , we have to chose the MCCB rating 2 - 3 times of the rated motor current rating ( Because motor draw 3-5 times of current than the rated current at starting )
2 . In case of STAR_DELTA or VFD , then we have to choose the MCCB rating 1.5 times of the rated motoe current rating .
Reason :
* Why we are selecting the MCCB rating greater than the actual motor current rating means that in case of full load the MCCB will be running in full load current so there are possibility to trip . so we are increasing the rating of the MCCB so that it can run in its 70-80 % of the rated current .
* MCCB's and MCB's are not designed for motor protection . You need to use OLR
( Over Load Relay ) or MPCB ( Motor Protection Circuit Breaker ) .
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