If a three-phase motor controlled by the control circuit illustrated in figure "B" of the illustration, is running in the forward direction, which of the following sequences must occur before the motor will reverse rotation? EL-0011

Correct Answer: Option C — First, the motor must be stopped via the stop button, then normally closed 'F' contacts must re-close, and finally the reverse start button must be depressed.

Electrical interlocking requires the forward contactor to drop out entirely, returning its normally closed auxiliary contacts to the closed state before the reverse circuit can be energized, preventing a damaging line-to-line short circuit between phases.