If an induction motor is rated at 40 amps for full-load current, what is the most probable starting sequence amps required?

When considering the starting current of an induction motor, it’s important to recognize that the inrush or starting current is typically significantly higher than the full-load current. This is primarily due to the rotor being at rest when the motor starts, which causes it to draw a large current to overcome the initial inertia and establish magnetic fields.

For a motor rated at 40 amps full-load current, the starting current can be anywhere from 4 to 8 times the full-load current depending on various factors such as the motor design and the type of starting method used. This means the starting current would likely range from 160 amps to 320 amps.

The selected answer, which indicates a starting sequence current in the range of 200-320 amps, falls within this calculated range and is therefore a plausible estimate for the starting current required for a 40-amp full-load rated induction motor. This estimate aligns with standard practices in motor operation, where it's recognized that the motor's starting sequence can impose a significant electrical load on the supply.

The other ranges provided either underestimate the starting current (like the range of 50-100 amps) or exceed the expected typical starting current for this size of motor (like the range of 350-400 amps), making them