General Electric DS200TCTGG1AFF Simplex Trip Board

Q1: What is the primary role of DS200TCTGG1AFF in the Mark V rack?

A1: It is the Simplex Trip Board that monitors overspeed, vibration and temperature; when any limit is exceeded it opens solid-state relays within 8 ms to initiate an emergency turbine shutdown .

Q2: How many relays are on the board and can they be replaced in the field?

A2: 21 plug-in relays (K1…K21) are fitted; each snaps into a socket under a metal strap and can be pulled out with the strap removed, allowing hot-swap style replacement while the rack is de-energised

Q3: Is the board suitable for safety-critical loops?

A3: Yes—its solid-state design, 2.5 kV isolation and SIL 3 rating per IEC 61508 make it acceptable for turbine protection up to SIL 3 when used in a single-channel (simplex) architecture

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