The job of an MCB (Miniature Circuit Breaker) or fuse is to detect high fluctuations of current in the circuit and to protect the circuit from an overcurrent.
10 - 20 minutes
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MCB or Fuse repair FAQs
Is there any warranty provided?
The warranty of the replaced part will be valid here.
More about MCB or Fuse repair
Once they detect abnormality in the current levels and immediately break the circuit protecting electrical appliance from damage. MCB is reusable but fuse needs to be replaced every time it goes faulty.