An overcurrent relay having a current setting of 125% is connected to a supply circuit through a current transformer of ratio 400/10. The pick-up value will be:

Correct option is B

​$$\text{Given that,} \\\text{Current setting} = 125\% = 1.25 \\\text{Relay CT ratio} = \frac{400}{10} \\\text{Rated secondary current} = 10 \, \text{A} \\\text{Therefore, pickup value current of relay} = 10 \times 1.25 = 12.5 \, \text{A}$$​​