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How to Calculate the size of Circuit Breaker for a Three phase load ?
Lets take a load that needs a power rating of 10kW and on voltage of 415V. (Vline) 240V Vphase
What size circuit breaker is needed for three-phase system?
P = 3 x VPH x IPH x CosФ
P = √3 x VL x IL x CosФ
If I use phase values do I need to divied the power by 3 (1000/3) before using the formula ?
Does it matter how the three phase system is connected Star or Delta ?
My calculation was 1000/(√3x415*0.8) = 1.739 Amps is this per phase ? and therefore ... 1.74 x 3 = 5.2 Amps, so i need a 6 or 10Amp breaker is needed ?
