Calculate the mcb rating (circuit breaker)

For calculate mcb rating we need know current or Ampere (I) of electrical load. For calculate it we use formula :

I load = P/V

for, I load : current load, P : power, and V : Voltage

Ex : I Load 500 W 220 V

P : 50 W
V : 220V

so, I = 500W / 220V
      I = 2.27 A

Now to calculate MCB rating we can use formula

I mcb = I load × 125 %


Ex : I load = 2.27 A so,

 I mcb = 2.27 A x 125 % = 2.84 A or 3 A for MCB rating who use.



Thank you for visiting