Relay Driver Board or Terminal Board? Both Describe the IS200EXHSG1AEC

You'll see this part listed under a couple of different names — "Relay Driver Board" and "High-Speed Static Exciter Terminal Board" both refer to the same IS200EXHSG1AEC. Both are accurate: the board's whole purpose is driving DC contactor relays at higher current than GE's standard terminal board design allows, using solid-state relay drivers in place of conventional electromechanical ones, working with a high-speed contactor for protection duty. It's part of the EX2100 static excitation control system, which runs alongside Mark VI or Mark VIe turbine control on the same generator, and it distributes signals to the exciter's main I/O board (EMIO) through P1/P2 backplane connectors, handling pilot relay contact outputs, contact inputs, and signal conditioning along the way.

Despite sharing an IS200 prefix with the Mark VI turbine controller's own VME cards, this board doesn't mount in a VME rack — it has no metal installation faceplate. On the board itself: three D-shell cable connectors along the front edge, eight plug connectors, fifteen integrated circuits, seven relays, a heat sink, and a combination of electrolytic, ceramic, and polyester-vinyl capacitors.

Rule These Out Before You Install a New Board

A factory-fresh board is only useful if the diagnosis behind the order is correct. Before swapping this in:

• Test the DC contactor and its coil wiring for continuity — mechanical and wiring faults on the contactor side trip the system the same way a bad relay driver does.
• Check relay states and LEDs against the physical field wiring, not just the alarm text, to isolate a control-logic fault from a field-wiring fault.
• Check the P1/P2 connection to the EMIO board and the EMIO board itself — a fault at the regulator level doesn't always trace back to this terminal board.
• Confirm your circuit genuinely needs the high-current EXHS design rather than a standard EXTB terminal board; the two look alike but aren't interchangeable.

Once the contactor, wiring, and EMIO link are confirmed good, this board is the correct next step.

What IS200EXHSG1AEC Tells You About Group and Revision

IS200 is the platform prefix, EXHS the function code, and G1AEC the group and revision — G1A for the group/generation, EC for this specific hardware revision. GE's own documentation for this group notes that its first two revisions are backwards-compatible with each other, which is useful to know if your nameplate shows a slightly different suffix than what's listed here. Even so, always confirm against the complete part number rather than assuming compatibility. Our GE Speedtronic Part Number Decoder covers how to read the full IS200 string.

Related Boards

This board's closest relative is the standard IS200EXTB terminal board, which handles the same basic function without the solid-state, high-current relay drivers. On the rack side, it connects to the EMIO (EX2100 Main I/O) board through 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 Send With Your Quote Request

• Full part number with suffix: IS200EXHSG1AEC
• 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 IS200EXHSG1AEC is new surplus, factory packaged, with a 1-year warranty (see table below). Pricing is quoted directly rather than posted 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	IS200EXHSG1A Mark VI IS200
Description	IS200EXHSG1A By GE IS200EXHSG1AEC Relay Driver Board New Surplus Factory Package
Condition	newSurplusFactoryPackage With 1 Year Warranty.