What the TCPD Card Does Inside the <PD> Core

When a Mark V technician needs to restart the <S> core without disturbing <R> or <T>, the switch they reach for is mounted on this board. The DS200TCPDG1B power distribution card — this listing is the BCC revision, DS200TCPDG1BCC — occupies the power distribution core of the GE Speedtronic Mark V panel, abbreviated <PD> in GE's documentation. Its job is unglamorous and absolutely critical: take the incoming 125 V DC (from the station battery, or produced from 115/230 V AC by a DACA converter assembly), fuse it, and hand it out to every section of the panel that needs it.

Its distribution list, per Mark V application documentation, includes the DS200TCPS power supply board in each processor core — <R>, <S>, <T>, and <C> — the three TCEA emergency protection boards on the X, Y, and Z channels of the protective core, solenoid power for the DTBC and DTBD terminal boards, and AC for gas turbine ignition transformers. Configuration is purely hardware: apart from its fuses and switches, one BJS jumper sets the DC ground reference on systems fed from an external floating source. There is no software, no PROM, and no processor on this card.

Hardware at a glance

• 36 fuses in twist-open canisters, each with a green OK LED that stays lit while the fuse element is intact
• Eight toggle switches for powering individual cores and the X, Y, and Z protective channels up or down
• Four AC input terminals, labeled AC1H, AC1N, AC2H, and AC2N
• Keyed connectors distributing 125 V DC to the core power supplies and protection boards

Diagnostic Checklist Before Replacing a Power Distribution Board

Because everything downstream of the TCPD dies when it loses power, this board gets blamed for a lot of failures it did not cause. Work through this list before committing to a replacement:

• Verify the incoming supply. If every OK LED on the board is dark, the problem is almost certainly upstream: battery breaker open, DACA converter down, or an input termination issue — not 36 simultaneously blown fuses.
• Treat a blown fuse as a symptom. A dark LED at one position points at the circuit that fuse protects. Test the downstream wiring — a shorted solenoid or damaged cable will simply take out the replacement fuse.
• Check the toggle switches. After maintenance it is not unheard of for a core to sit dead because its power switch on the TCPD was never flipped back.
• Chase core reboots into the core itself. Mark V field history is consistent on this point: repeated single-core trouble traces far more often to a TCPS power supply or a loose ribbon cable inside the affected core. In one published field case, technicians disconnected every wire leaving the TCPD while chasing a fault that turned out to be a leaking station battery grounding the 125 V DC bus.
• Confirm DC bus quality. Ground faults and AC ripple on the 125 V DC system produce erratic, panel-wide symptoms that no replacement TCPD will fix.

When the TCPD itself is the failure, the evidence is usually visible: heat-damaged terminals, a cracked switch, corroded fuse holders, or connector damage from a hurried board swap. Photograph what you find — it helps us confirm you are ordering the right fix.

DS200TCPDG1BCC: How the Suffix Breaks Down

The number decodes field by field. DS200 is the GE board series used throughout the Mark V panel; TCPD is the functional acronym for the power distribution card; G1 assigns the board to Group 1 with the standard coating; and the trailing BCC is the revision block, conventionally read in the surplus and repair market as functional revision B, second-level revision C, and artwork revision C. Match the group exactly — a G1 board is not a G2 board, and neither is interchangeable with any H-group part number. Revision letters should be matched as closely as your drawings require; send us the full string from your label and we will confirm what fits. For the general method, see our GE Speedtronic Part Number Decoder.

Companion Hardware in the Mark V Power Path

The TCPD rarely fails alone, and when power symptoms appear it pays to know its neighbors: the DACA AC-to-DC converter feeding it, the DS200TCPS supplies it powers in each core, the TCEA protection boards in the protective core, and the DTBC/DTBD terminal boards carrying its solenoid outputs. All of these appear in our GE Mark V DS200 Boards collection; the wider board set is introduced in GE Mark V DS200 Boards Explained. If your plant is weighing an upgrade path instead of a like-for-like swap, start with Mark V vs Mark VI: DS200 to IS200.

What We Need to Quote DS200TCPDG1BCC

• The complete part number as printed on your board label, including all revision letters
• A photo of the label — it resolves group and revision questions in seconds
• Turbine model and fuel type, and whether the panel is Simplex or TMR
• Quantity required and the urgency: forced outage, planned outage, or shelf spare
• Ship-to country so we can route the shipment DDP

Get Your Quote Within 24 Hours

This DS200TCPDG1BCC ships in the condition documented below — a cleaned and tested used board backed by a one-year warranty. Click Request a Quote, send the details above, and you will have a written response from our team within 24 hours. We deliver worldwide under DDP terms and accept purchase orders from utilities, IPPs, and turbine service companies.

General Information about the Product
Part Number	DS200TCPDG1B Mark V DS200
Description	GE DS200TCPDG1B DS200TCPDG1BCC Power Distribution Board Mark V
Condition	used Clean and Tested. With 1 Year Warranty.