Troubleshooting an Exciter Trip? Read This Before You Order the IS200EXHSG3AEB

If a nuisance exciter trip or a relay-driver alarm has you looking at an IS200EXHSG3AEB, it's worth understanding what this board actually controls before you commit to a replacement. It's a High-Speed Static Exciter Terminal Board in GE's EX2100 excitation control system, built to distribute signals to the exciter's main I/O board (EMIO) through P1/P2 backplane connectors while handling pilot relay contact outputs, contact inputs, and signal conditioning. The "high-speed" designation comes from its use of solid-state relay drivers on its DC contactor outputs — in place of the conventional electromechanical relay drivers found on GE's standard EXTB terminal board — so it can work with a high-speed contactor in higher-current protective circuits.

Before assuming this board is the fault, test the DC contactor and its coil wiring for continuity: a mechanical or wiring problem on the contactor side produces the same trip symptoms as a failed relay driver on the board itself. It's also worth checking relay states and LEDs against the actual field wiring rather than relying only on the alarm description, since that quickly separates a control-logic fault from a field-wiring fault. And because this board feeds the EMIO board over P1/P2, a fault reported at the exciter regulator level doesn't always originate here — check that connection and the EMIO board too. Finally, confirm your circuit genuinely calls for the high-current EXHS design rather than a standard EXTB terminal board; the two are close relatives built for different current ratings, and they aren't a safe one-for-one substitute.

Construction and Where It Sits

This is a terminal board, not a VME card, despite carrying the same IS200 prefix used on Mark VI turbine control boards — it has no metal installation faceplate and does not mount in a VME rack. 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 mix of electrolytic, ceramic, and polyester-vinyl capacitors. It's stocked alongside Mark VI IS200 boards because EX2100 excitation and Mark VI (or Mark VIe) turbine control are typically installed and maintained together on the same unit.

Reading the IS200EXHSG3AEB Part Number

IS200 is the platform prefix, EXHS the function code, and G3AEB the group and revision — G3A for the group/generation, EB for this specific hardware revision. This is a different revision than the G3AEC boards also stocked in this collection, so match the complete part number rather than assuming any G3A board is interchangeable. Our GE Speedtronic Part Number Decoder explains how to read a full IS200 string.

Related Boards

The nearest relative to this board is the standard IS200EXTB terminal board, which performs the same basic function at standard current ratings. On the rack side, it connects to the EMIO (EX2100 Main I/O) board over P1/P2. For sites also supporting 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: IS200EXHSG3AEB
• 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 IS200EXHSG3AEB is listed in used condition, clean and tested, with a 1-year warranty (see table below). We quote every order directly instead of publishing prices — submit a Request a Quote and expect a reply 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	IS200EXHSG3A Mark VI IS200
Description	IS200EXHSG3A By GE IS200EXHSG3AEB Exciter High-Speed Relay Driver Board
Condition	used Clean and Tested With 1 Year Warranty.