Factory-Packaged Spare for the Mark V <PD> Core

A gas or steam turbine can run for decades on the same Speedtronic Mark V panel — provided the boards everything else depends on are on the shelf when they are needed. This listing is a new surplus DS200TCPDG1B power distribution board, revision DS200TCPDG1BDC, in factory packaging. It is the card GE placed in the <PD> core to fuse and distribute the panel's 125 V DC: out to the DS200TCPS power supply in each processor core (<R>, <S>, <T>, and <C>), to the three TCEA protection boards on the X, Y, and Z channels of the protective core, and onward to solenoid and ignition circuits through the digital-side terminal boards, per GE's Mark V application documentation. Incoming power is battery-backed 125 V DC, 115/230 V AC rectified by a DACA converter, or both.

Why Plants Keep a TCPD on the Shelf

TMR redundancy protects a Mark V against a processor failure: <R>, <S>, and <T> vote, and the turbine rides through the loss of one channel. Power distribution enjoys no such redundancy — the <PD> core is common equipment serving every core, including the protective channels. That asymmetry is why experienced Mark V sites treat this board the way they treat the TCPS supplies: unlikely to fail in any given year, unacceptable to wait for when it does. Physical wear is the typical end-of-life mode — burned AC terminations, fuse holders that lose spring tension after decades of thermal cycling, toggle switch mechanisms worn by outage after outage of core reboots. None of that repairs quickly in the field, and the Mark V line is long out of OEM production.

Confirm the Failure Before You Swap

Even with a spare in hand, verify before you swap — the board's indicators do most of the work:

• All 36 green fuse LEDs dark means no incoming power: check the station battery, breaker, and DACA AC-to-DC converter before opening the panel.
• A single dark LED means one open fuse — and usually a downstream short that will clear a fresh fuse just as fast. Fix the cause first.
• A dead or rebooting core is more often its own TCPS supply or an internal ribbon cable; public Mark V field threads document exactly this misdiagnosis, including one where a leaking station battery mimicked panel power faults for weeks and another where a rebooting <S> core was finally fixed by a TCPS replacement.
• Confirm all eight core power toggle switches are in their intended positions — an overlooked switch has embarrassed more than one night shift.

If the evidence is physical — charred terminals, cracked switch bodies, loose fuse canisters — the diagnosis is honest, and this factory-packaged board closes it out.

Decoding G1BDC on the Board Label

DS200TCPDG1BDC parses as: DS200 board series, TCPD power distribution function, Group 1 (G1), and revisions B/D/C — conventionally functional revision B, second-level revision D, artwork revision C. When stocking a spare, buy the group your drawings call for: G1 and G2 are distinct builds (and no G-group number ever substitutes for an H-group number), and revision letters should sit at or near your installed board's level. The mechanics of GE's lettering are laid out in our GE Speedtronic Part Number Decoder, and the wider board landscape in GE Mark V DS200 Boards Explained.

Related Mark V Power and Protection Boards

Spare strategies usually bundle this card with the hardware around it: DS200TCPS core power supplies (the most frequently replaced power item in the panel), the DACA converter on AC-fed installations, and TCEA protection boards. You will find them in the GE Mark V DS200 Boards collection. Sites planning an eventual migration can weigh options in Mark V vs Mark VI: DS200 to IS200 — many operators stock critical Mark V spares precisely to control the timing of that decision rather than let a failure dictate it.

How to Request Your Quote

Use the Request a Quote button and include: the full part number (DS200TCPDG1BDC) and revision from your installed board's label, a label photo, your turbine model and panel configuration (Simplex or TMR), quantity, and required delivery timeframe. Quotes go out within 24 hours. This board is new surplus in factory packaging, covered by the warranty stated below; it ships worldwide DDP — duties and clearance handled by us — and purchase orders are accepted.

General Information about the Product
Part Number	DS200TCPDG1B Mark V DS200
Description	GE DS200TCPDG1B DS200TCPDG1BDC Power Distribution Board Mark V NEW
Condition	newSurplusFactoryPackage Factory Packaged. With 1 Year Warranty.