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The circuit breaker size can be found when some other information is given. For a given voltage value, the size of the cb is basically found using the formula

P(Kw) = IV here the value of I is approx the value of the circuit breaker. The solution is not so simple since there are normally tolerances set by the different regulator organisations as to these values.

Another situation to consider is the type of current and voltage you are using ie ac or dc, Vac or Vdc. also the amount of phases if it is ac voltages we are considering . If 3 phase ac voltage and current the formula used is as follows

P(kva) = 1.73 x IL x VL x pf where pf , the power factor is the introduced and kva the apparent power is used instead of kw here because under most conditions a power factor of 1 cannot be achieved. IL and VL are the line current and voltage.

Gladstone

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17y ago

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