What the IS200ECTBG1A Does in an EX2100 Exciter

The IS200ECTBG1A is the Exciter Contact Terminal Board (ECTB) used in redundant configurations of the GE EX2100 Excitation Control — the static excitation platform GE deployed for generator field control alongside Speedtronic Mark VI-era turbine controls. It is not a Mark VI turbine I/O board, even though it carries the same IS200 platform prefix and is usually catalogued with Mark VI hardware. Its job is contact-level interfacing: it lands the exciter's discrete inputs and relay contact outputs on field-wireable terminals and passes them to the exciter's control electronics.

Per GE's EX2100 documentation (GEH-6632), the ECTB carries two trip contact outputs that typically drive a customer lockout device, four general-purpose Form-C relay outputs (labeled K1GP through K4GP), and six auxiliary contact inputs wetted at a nominal 70 V dc. The generator breaker and lockout contact inputs (52G and 86G) are also monitored and powered from the same 70 V dc source. Field wiring lands on two removable terminal blocks (TB1 and TB2), while three 25-pin D-sub connectors — J405, J408, and J415 — cable the board to the EBKP backplane and from there to the EMIO (Exciter Main I/O) boards.

Because this is the G1A group, the board is built for redundant control: relay drivers are fed from the M1, M2, and C controllers and combined through 2-out-of-3 contact voting, and contact input status fans out to all three controllers. Wetting power arrives from both the M1 and M2 supplies through plugs J13M1 and J13M2.

Confirm the Fault Before Replacing the Board

The ECTB is a largely passive termination and relay board, and much of what looks like an ECTB failure actually originates upstream or in the field. A few honest checks before you order:

• All six contact inputs read dead. Measure the wetting voltage at the input terminals. If the nominal 70 V dc is missing across the whole board, suspect the wetting supply path through J13M1/J13M2 before the ECTB itself.
• One input reads dead, the rest are fine. With wetting voltage present, the problem is usually the field contact or its wiring, not the terminal board. Each input circuit drives an on-board status indication, which helps you confirm whether the board actually sees the contact change state.
• A Form-C output will not change state. The relay drivers are commanded from the EMIO side — verify the command actually reaches the ECTB (EMIO health, backplane cabling on J405/J408/J415) before condemning a relay. Also confirm that the customer-side control voltage wired to the output terminals, commonly 125 V dc, is present.
• Nuisance trip suspicion. In a redundant EX2100, the trip drivers are voted 2-out-of-3, so a single failed channel should not by itself operate the lockout. If the lockout operated, examine the lockout relay and the trip chain as a whole, not only this board.

If those checks still point at the terminal board — burned relay contacts, failed on-board wetting distribution, connector damage — a replacement ECTBG1A is the right call.

Decoding the Part Number and the DE Revision

This listing is for IS200ECTBG1ADE. Read it as IS200 (GE control platform prefix) + ECTB (Exciter Contact Terminal Board) + G1A (functional group) + DE (revision letters). The group code matters on this family: per the EX2100 documentation, ECTBG1 is used exclusively in redundant control systems, while ECTBG2 is the simplex version — the two are not interchangeable. The trailing DE denotes the hardware revision level; when in doubt, match the full string on your board's label or ask us to verify compatibility. Our GE Speedtronic Part Number Decoder walks through the numbering scheme in more detail.

Boards That Work Alongside the ECTB

In the EX2100 signal chain, the ECTB terminates contact I/O while the EMIO boards serving the M1, M2, and C control cores do the actual reading and relay driving; the EBKP backplane ties them together. If your troubleshooting implicates the driver side rather than the termination side, quote the EMIO path at the same time so one outage covers both possibilities. We stock boards across the IS200 platform — browse the GE Mark VI IS200 Boards collection, and the wider GE Speedtronic Turbine Control Boards range for the turbine-control side of the same plants.

What to Include in Your Quote Request

• The full part number including revision — IS200ECTBG1ADE — exactly as printed on the board label.
• A photo of the label (and of any damage) if you can get one; it removes guesswork on group and revision.
• Your system details: EX2100 exciter, redundant (M1/M2/C) or simplex, and the generator or turbine it serves.
• Quantity, whether you want unused surplus or tested used stock, and how urgent the need is — forced outage or shelf spare.
• Delivery destination, so we can quote DDP to your door.

Request a Quote for This Open-Box ECTBG1A

This unit is unused surplus supplied without the original retail carton — factory packaged for protection and covered by the warranty stated below. Submit a Request a Quote with the details above and our team will respond within 24 hours. We ship worldwide on DDP terms, so duties and customs are handled before the board reaches your dock, and we accept purchase orders from qualified companies.

General Information about the Product
Part Number	IS200ECTBG1A Mark VI IS200
Description	GE General Electric IS200ECTBG1A IS200ECTBG1ADE Exciter Terminal Card OPEN BOX
Condition	newSurplusNoBox Factory Packaged. With 1 Year Warranty.