Phase Sequence Corrector Relay AE-1100 Used for protection of motors, pumps, transformers, etc from damage due to missing phases or negative phase sequences. A wrong sequences is corrected and two output contacts are provided which can be used to switch on the power contactors . Only the correct sequence contactor signal will be on at a time. However contactors must be interlocked during power wiring. The relay resets automatically and remains off when voltage is low, zero unbalanced or negative phase sequence. Manual reset can be provided.