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for protection from initial currents and short circuit,overload currents

Further Explanation

When a motor is stationary, the only opposition to current flow is the resistance of its windings. When the motor starts to turn, it generates a back emf. So, on starting, the current is high, and it reduces in value as the machine runs up to speed. With larger motors the starting current could overheat and damage the windings, so it is necessary to restrict the value of the starting current using a 'starter'.

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