IS200EXHSG4AEC: A Later Group in the EXHS Lineup

The IS200EXHSG4AEC carries the G4A group designation, one of four EXHS groups (alongside G1A, G2A, and G3A) stocked in this collection. All of them perform the same core function within GE's EX2100 static excitation control system: distributing 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 EXHS design as a whole is a high-current variant of GE's standard EXTB terminal board, using solid-state relay drivers on its DC contactor outputs instead of conventional electromechanical drivers, built to work with a high-speed contactor in higher-current protective circuits.

This board is not a VME card, despite the IS200 prefix it shares with Mark VI turbine control boards — it has no metal installation faceplate and does not mount in a VME rack. Physically, it has three D-shell cable connectors along its front edge, eight plug connectors, fifteen integrated circuits, seven relays, a heat sink, and a combination of electrolytic, ceramic, and polyester-vinyl capacitors. It's typically sourced and stocked alongside Mark VI IS200 boards because EX2100 excitation and Mark VI (or Mark VIe) turbine control are almost always installed on the same generator set.

What to Verify Before You Put This Board Into Service

Even with a factory-packaged spare in hand, confirm the failure is actually on this board before installing it:

• Test the DC contactor and its coil circuit for continuity. Mechanical or wiring problems on the contactor side reproduce the same trip symptoms as a bad relay driver on the board.
• Check relay states and LEDs against the actual field wiring rather than the alarm text alone, to separate control-logic faults from field-wiring faults.
• Check the P1/P2 link to the EMIO board and the EMIO board itself — a regulator-level fault doesn't always originate on this terminal board.
• Confirm your circuit actually requires the high-current EXHS design rather than a standard EXTB terminal board.

Once the contactor, wiring, and EMIO connection are confirmed clean, this spare should be a straightforward installation.

Decoding the IS200EXHSG4AEC Part Number

IS200 is the platform prefix, EXHS the function code, and G4AEC the group and revision — G4A representing a later group than G1A/G2A/G3A, with EC marking this specific hardware revision. Always order and quote against the complete part number; GE does not treat every EXHS group as interchangeable. Our GE Speedtronic Part Number Decoder explains how these IS200 strings are structured.

Related Boards

The nearest 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 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: IS200EXHSG4AEC
• 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 IS200EXHSG4AEC 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	IS200EXHSG4A Mark VI IS200
Description	IS200EXHSG4A By General Electric IS200EXHSG4AEC Exciter Terminal Board NSFP
Condition	newSurplusFactoryPackage With 1 Year Warranty.