Magnetic contactor are used in the electric motors to balance the change in frequency of the motor or the state of the motor which can be termed as the switching of the motor from on and off state. magnetic contactor act as a safeguard to protect the power supply and the motor.
why interlocking is used for the contactors?
A technique called interlocking is used to prevent the contactors from being energized simultaneously or closing together and causing a short circuit. this interlock locks out one contactor at the beginning of the stroke of either contactor to prevent short circuits and burnouts.

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