IS200EXHSG3AEC: An EX2100/EX2100e Excitation Board

This IS200EXHSG3AEC belongs to the excitation side of a gas or steam turbine-generator, not the turbine controller itself. It's a High-Speed Static Exciter Terminal Board built for GE's EX2100 and EX2100e static excitation control platforms, which run alongside — but separately from — Mark VI or Mark VIe turbine control on the same unit. Its job is distributing signals to the exciter's main I/O board (EMIO) through P1/P2 backplane connectors, and handling pilot relay contact outputs, contact inputs, and signal conditioning. What separates it from GE's standard EXTB terminal board is the use of solid-state relay drivers on its DC contactor outputs, built specifically to work with a high-speed contactor in higher-current protective circuits.

On construction: three D-shell cable connectors along the front edge, eight plug connectors, fifteen integrated circuits, seven relays, a heat sink, and a mix of electrolytic, ceramic, and polyester-vinyl capacitors. Despite carrying the same IS200 prefix as Mark VI turbine control boards, this is a terminal board with no metal installation faceplate — it does not mount in a VME rack. You'll typically find it stocked and quoted alongside Mark VI IS200 turbine boards simply because the two systems are installed and maintained together.

Keep a Spare, But Confirm the Fault First

Stocking a factory-packaged EXHS ahead of an outage is good practice, but it's still worth confirming the diagnosis before you pull it into service:

• Test the DC contactor and its coil circuit for continuity — a mechanical or wiring fault there produces the same trip symptoms as a failed relay driver on the board.
• Check relay states and LEDs against the physical wiring, not just the alarm text, to separate a control-logic issue from a field-wiring issue.
• Verify the P1/P2 link to the EMIO board and the EMIO board itself before assuming the fault is on this terminal board.
• Confirm the application genuinely needs the high-current EXHS design rather than a standard EXTB terminal board.

With the contactor, wiring, and EMIO connection confirmed good, installing this spare should resolve the issue.

Reading the IS200EXHSG3AEC Suffix

IS200 is the platform prefix, EXHS the function code, and G3AEC the group and revision — G3A for the group/generation, EC for the specific hardware revision. This collection also stocks a G3AEB variant, which is a different revision within the same group, so always match the complete part number against your nameplate. Our GE Speedtronic Part Number Decoder covers how to read a full IS200 string.

Related Boards

The closest relative to this board is the standard IS200EXTB terminal board, used in standard-current circuits without the solid-state relay drivers. On the rack side, it connects to the EMIO (EX2100 Main I/O) board over P1/P2. If you're also sourcing parts for older Mark IV/Mark V equipment, see our Mark V vs Mark VI: DS200 to IS200 guide and GE Mark V DS200 Boards Explained article. Browse the rest of the family in our GE Mark VI IS200 Boards collection or the wider GE Speedtronic Turbine Control Boards collection.

What to Include in Your Quote Request

• Full part number with suffix: IS200EXHSG3AEC
• Revision from the label
• Photo of the ID label
• Exciter/turbine model and unit ID
• Planned spares stocking or urgent need
• Quantity

Request a Quote

This IS200EXHSG3AEC is new surplus, factory packaged, with a 1-year warranty (see table below). We quote every order directly rather than posting prices online — submit a Request a Quote and expect a response within 24 hours. We ship worldwide DDP, accept purchase orders, and support both planned spares programs and urgent breakdown orders.

General Information about the Product
Part Number	IS200EXHSG3A Mark VI IS200
Description	IS200EXHSG3A By GE IS200EXHSG3AEC H/S Terminal Board New Surplus Factory Package
Condition	newSurplusFactoryPackage With 1 Year Warranty.