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What could be the possible reasons for vibration of MCCB(NSX) ?

Causes of vibration of MCCB could be : 

1. Harmonics

2. Mounting of MCCB is not proper, or screws are not tightened properly. 

3. Loose terminal connections. 

4. We have to identify which part in the MCCB is actually vibrating. If its the coil then improper mounting of coil could also be a reason. 
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