DS200TCTSG2A is a Turbine Simplex Trip Board and is part of the GE Speedtronic Mark V gas turbine control systems. The trip cards have at least two separate sets of three primary trip relays and two separate sets of three emergency trip relays. Some applications require additional relays for other functions. The PTRs are controlled from each of the (TCQA) cards in R, S, T Cores, and the two ETRs are controlled from the TCEA Cards in P Core. If two out of 3 PTR (or) two out of three (3) ETRs de-energize the turbine will trip.