When Selecting A Circuit Breaker, The Rated

When selecting Circuit breaker, the rated breaking capacity of the circuit breaker must be greater than or equal to the maximum short-circuit current that may occur in the protected circuit, rather than the maximum load current. This is because the main function of the circuit breaker is to quickly cut off the power supply when a short circuit or overload occurs in the circuit to protect the safety of the circuit and equipment. The rated breaking capacity refers to the maximum limit current that the circuit breaker can withstand under normal working conditions, ensuring that it can reliably disconnect the circuit in the event of a short circuit and avoid overheating or damage caused by thermal stability and dynamic stability problems. In addition, the rated current, dynamic stability current and thermal stability current of the circuit breaker are also key parameters, which are strictly tested by the manufacturer before leaving the factory and meet the specifications. Therefore, when selecting a circuit breaker, it is necessary to ensure that its rated breaking capacity can cover the maximum short-circuit current that may occur in the circuit to ensure the safe operation of the circuit.