GE IS200TTSAG1A Mark VI Trip Servo Interface Terminal Board

IS200TTSAG1A provides the TTSA resistor-network interface for external trip servos. Four sets of power resistors support bipolar current in dual-coil servos rather than performing the turbine controller calculations.

IS200TTSAG1A is documented with connections for up to four external trip servos. Each servo uses two coils, and the field wiring connects to the designated pluggable barrier terminal strips.

IS200TTSAG1A uses the TTSA nominal 125 Vdc connection described in the GE wiring instructions. That nominal operating connection is distinct from the documented 145 Vdc high-line withstand condition.

IS200TTSAG1A uses TTSA power-resistor networks designed to withstand a high DC line of 145 V with zero coil impedance. This is a design condition, not a separate nominal supply setting.

IS200TTSAG1A implements the TTSA function described for Mark V, Mark VI and Mark VIe arrangements. The resistor interface operates independently of the main controller type; the installed trip and servo wiring still determines the circuit connections.

IS200TTSAG1A is the requested G1A identity. GE describes the TTSA function as equivalent to the earlier 194B5725 servo module, but no other TTSA suffix is presented here as an approved drop-in replacement.