IS200EXHSG1AEC: Function, Construction, and a Note on Revisions

As a High-Speed Static Exciter Terminal Board, the IS200EXHSG1AEC is responsible for distributing signals to the exciter's main I/O board (EMIO) through its P1/P2 backplane connectors, as part of GE's EX2100 excitation control system. It's essentially a duplicate of GE's standard IS200EXTB terminal board, with one key difference: it's built for high-current applications, using solid-state relay drivers on its DC contactors instead of conventional electromechanical relay drivers, which lets it work with a high-speed contactor in higher-current protective circuits. On the excitation side, that means handling pilot relay contact outputs, contact inputs, and signal conditioning.

Construction-wise, the board has three D-shell cable connectors along its front edge, eight plug connectors, fifteen integrated circuits, seven relays, a heat sink, and a mix of electrolytic, ceramic, and polyester-vinyl capacitors. It carries the IS200 prefix but is not a VME card — it has no metal installation faceplate and does not mount in a VME rack, which is a useful way to distinguish terminal boards like this one from the VME cards that share IS200 numbering in Mark VI turbine control. GE's documentation for this specific group indicates that this board has gone through three hardware revisions, and that the first two are backwards-compatible with each other — worth checking if you're trying to match a slightly different suffix against what's currently installed.

Before You Order a Replacement

Not every exciter trip traced to this board is actually a board failure. Check the following first:

• Test the DC contactor and its coil circuit for continuity — a mechanical or wiring fault here can trip the system the same way a bad relay driver on the board would.
• Compare relay states and LEDs against the actual field wiring, not just the fault description, to separate a control-logic issue from a field-wiring issue.
• Check the P1/P2 connection to the EMIO board and the EMIO board itself — faults reported at the exciter regulator level don't always originate on this terminal board.
• Confirm you actually need the high-current EXHS design rather than the standard EXTB terminal board; they look and function similarly but serve different current ratings.

If the fault is confirmed local to the board after these checks, ordering this part is the right call.

Reading the IS200EXHSG1AEC Part Number

IS200 is the platform prefix, EXHS the function code, and G1AEC the group and revision — G1A for the group, EC for this specific revision. As noted above, GE's documentation for this group shows the first two revisions as backwards-compatible, but don't extend that assumption to every suffix in the EXHS family without checking. Our GE Speedtronic Part Number Decoder explains how to read the complete IS200 string.

Related Boards

The closest relative to this board is the standard IS200EXTB terminal board. On the rack side, it connects to the EMIO (EX2100 Main I/O) board over P1/P2. If your site also runs 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: IS200EXHSG1AEC
• Revision from the label
• Photo of the ID label
• Exciter/turbine model and unit ID
• Planned outage or urgent need
• Quantity

Request a Quote

This IS200EXHSG1AEC is listed in used condition, clean and tested, 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 outages and urgent breakdown needs.

General Information about the Product
Part Number	IS200EXHSG1A Mark VI IS200
Description	GE IS200EXHSG1A IS200EXHSG1AEC Printed Circuit Board Mark VI
Condition	used Clean and Tested. With 1 Year Warranty.