Factory-Sealed DS200TCTSG1AFA Trip Board

Offered as new surplus in factory packaging, the DS200TCTSG1AFA is a GE SPEEDTRONIC Mark V Simplex Trip Board (TCTS) in the G1AFA revision. For a board that lives in the turbine's protection system, an unused, warranty-backed unit is the ideal commissioning spare — ready to drop in when a relay-stage fault finally forces the issue.

The TCTS is not a glamorous card, but it is a critical one: its pluggable relays provide the contacts that tie into the turbine's emergency-shutdown circuit. Getting the right revision, and confirming the fault before you fit it, are what make a replacement go smoothly.

What This Board Does in the Mark V

Inside a Mark V panel, the Simplex Trip Board is the relay-output stage of the trip system. It connects back to the control section through ribbon cables at JDR, JDS and JDT (16-pin) and JN and JM (12-pin), and it operates within a panel built around the control cores <R>, <S> and <T>, the common core <C> and the separate protection core <P>. The actual trip setpoints, the voting scheme and any functional test are defined in GE's documentation (GEH-5980 and your job's elementary drawings) and your plant procedure — deliberately outside the scope of this listing, which stays at identification and diagnosis. New to the layout? Start with GE Mark V DS200 Boards Explained.

Rule Out the Look-Alikes First

Even a perfect new board will not fix a fault that lives outside it. Before you install the DS200TCTSG1AFA, verify the trip board is really the cause:

• Commanded vs spurious. The <I> operator interface logs whether the control or protection cores called for the shutdown. A commanded trip clears the board of blame.
• The single relay. Relays are individually replaceable, so a lone sticky or open relay imitates a board failure. Reseat or change that device first.
• Field hardware. Trip solenoids, dump valves and their wiring fail more often than the PCB — test continuity and the interposing power.
• Interfaces. Confirm the JDR/JDS/JDT and JN/JM ribbons are fully seated and the relay terminal board is healthy.

Keep the investigation to identification and elimination; live trip testing follows the GE manual and your written procedure, never a parts page.

Part-Number Anatomy: DS200TCTSG1AFA

Break the number into its parts: DS200 (Mark V DS200 series) + TCTS (Simplex Trip) + G1 (functional group) + A (functional revision) + FA (board artwork/hardware revision). The trailing letters distinguish this build from other G1A variants such as FE, EE or CC, so match the whole string to your installed board and drawings. The GE Speedtronic Part Number Decoder explains each segment.

Companion Boards Worth Checking

When you are servicing the trip system it is worth reviewing the neighbouring cards at the same time: the DS200TCTG trip board, the DS200TCTE trip module and the relay terminal boards that carry the field wiring. If a Mark VI migration is on your roadmap, Mark V vs Mark VI: DS200 to IS200 maps the trip and I/O functions onto the IS200 platform. Everything currently in stock is listed at GE Mark V DS200 Boards.

Request a Quote (Worldwide, DDP)

Send us the full part number with suffix (DS200TCTSG1AFA), a photo of the board-edge revision label, your turbine model, Simplex or TMR configuration, quantity and how soon you need it. We reply within 24 hours, ship worldwide DDP and accept purchase orders. Click Request a Quote to get started, or explore the wider selection under GE Speedtronic Turbine Control Boards.