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Making capacity of Circuit breaker is

  • Making capacity of Circuit breaker is greater than the asymmetrical breaking capacity.
  • The breaking capacity of a circuit breaker refers to its ability to interrupt the maximum current that can flow through it under specific fault conditions.
  • The breaking capacity is expressed in terms of symmetrical breaking capacity and asymmetrical breaking capacity.
  • The making capacity of a circuit breaker refers to its ability to withstand the high current transient during the closing operation.
  • During the closing operation, a high current transient is produced due to the inrush of magnetizing current in transformers and other inductive loads.
  • This high current transient can cause damage to the contacts of the circuit breaker if the making capacity of the circuit breaker is not sufficient.
  • Therefore, to ensure the safe and reliable operation of the circuit breaker, its making capacity must be greater than its asymmetrical breaking capacity.
  • This ensures that the circuit breaker can withstand the high current transients during the closing operation and interrupt the fault current during a fault condition without any damage to its contacts.