Positive Sequence Undervoltage TTGD7112
The TTG7000 series of relays are designed to check voltages on AC networks.  The TTGD7112 model is used for supervision of rotating machine torque, by measuring the positive sequence voltage with a simultaneous check on the auxiliary supply. ANSI code 27.

The TTGD7112 is a time-delayed relay; the former instantaneous version (TTGD7012) has been retired from service as the minimum time setting on the TTGD7112 (0.3s) is comparable to the operation time of the TTGD7012.

See the homepage for Static relays for the full brochure.  This relay is included in the TTG7000 brochure.