When the driver turns the key to the start position, the contactor closes the circuit to allow current to flow to the motor.
(the driver; turns; the key to the start position) (the contactor; closes; the circuit; to allow current to flow to the motor; T:When the driver turns the key to the start position)
the driver the contactor
turns closes
the key to the start position
the circuit to allow current to flow to the motor T:When the driver turns the key to the start position