Five Steps for Correct Selection of Low Voltage Circuit Breaker

June 23,2022

  1. The rated current of the circuit breaker is determined by the calculated current of the circuit.

 

  1. The short-circuit setting current of the circuit breaker shall avoid the normal working starting current of the line.

 

low voltage circuit breaker

 

  1. Check the breaking capacity of the low-voltage circuit breaker according to the maximum short-circuit current of the line.

 

  1. The sensitivity of circuit breaker action shall be verified according to the minimum short-circuit current of the line, that is, the minimum short-circuit current of the line shall not be less than 1.3 times of the short-circuit setting current of the circuit breaker.

 

  1. The rated short-circuit making capacity (expected peak value of the maximum current) of the circuit breaker shall be verified according to the short-circuit impulse current on the line (i.e. the maximum instantaneous value of the full short-circuit current), that is, the latter shall be greater than the former.
 
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