Can a 7.5KW water pump use a 40A circuit breaker switch?

Is it possible to use a 40A circuit breaker switch for a 7.5KW pump? Below we calculate according to the formula:

Can a 7.5KW water pump use a 40A circuit breaker switch?

5.5kw motor current calculation:

:P=√3×U×I×cos∮I=P÷(√3×U×cos∮)=5.5÷(√3×0.38×0.85)=10(A)

According to the current comparison table, the 5.5KW motor should have at least a .25 square copper wire.

The air switch is selected according to about 1.5 times the motor current. The 16A air switch can be selected.

7.5KW three-phase motor, rated current is about 15A (25A). The thermal relay is selected from 1.1-1.25 times the load current.

The motor contactor is recommended to be equipped with CJX2-2510A, and the thermal relay is selected for JR36-20A.

Contactor is Chint Cj20-32 thermal relay is 21

According to the empirical formula: the voltage is 380 volts, one kilowatt and two currents. Therefore, 7.5KW should be 15A. But the starting current should be four to six times the rated current!

380V motor current calculation formula: I = (P × 10??) ÷ (√ 3U × cos × × ∩) I - current A; P - motor power KW; U - voltage V is 380V cos ¢ - - the power factor of the motor; ∩ - the efficiency of the motor if cos¢ and ∩ do not know. Take all 0.85I=(7.5×10??)÷(√3×380×0.85×0.85)I≌7500÷475.53≌15.77A