IS200TREGH2B: the 24 V dc Emergency Trip Board

The IS200TREGH2B is the 24 V dc member of the GE Mark VI turbine emergency trip terminal board family. Functionally it mirrors the 125 V dc H1B board, but it is built for protection circuits that operate at 24 V dc, which is exactly why the group designation on this board is worth confirming before you order. As with every board in the emergency-trip path, this page is for identification and sourcing; trip logic and test steps stay with GE’s documentation and your plant procedures.

Landing the Emergency-Trip Field Wiring

The TREG is the termination where the protection circuit meets the field. The plant’s emergency-stop wiring and the protection trip-interlock wiring land on the board’s terminal blocks, together with the trip-solenoid connections, and the board supplies the positive side of the solenoid DC power (the companion TRPG board supplies the negative side). The board itself carries no application logic; it terminates, interconnects and routes these circuits to the protection processor. Handling matters: because this hardware is in the trip path, it should only be removed or replaced under the site’s protection work permit and lockout practices.

Where the Board Ends and the Protection Module Begins

In Mark VI, the IS200TREGH2B connects by molded-plug cables to the VPRO emergency-trip/protection processor; in Mark VIe it is managed by a PPRO pack on the SPRO board. The diagnostics for the trip circuit are produced by that protection module, not by the terminal board, so a trip-circuit alarm should send you to the processor’s fault log first. Each of the JX1, JY1 and JZ1 connectors carries an ID device the processor reads; a hardware-incompatibility fault usually points to a revision or plug mismatch, or a cable issue, rather than a dead board. Reserve board replacement for visible damage — cracked blocks, corroded terminals, or connector damage.

Reading IS200TREGH2BDC and Matching the Voltage Group

Break the number into fields: IS200 (Mark VI series), TREG (emergency-trip function), H2 (hardware group), B (functional revision), and on the full number IS200TREGH2BDC the trailing DC artwork revision. GE documents the H2B as the 24 V dc application variant, otherwise equivalent to the 125 V dc H1B. Because the H1 and H2 groups are built for different circuit voltages, matching the group is not optional — confirm your protection circuit voltage and order the matching board. The GE Speedtronic Part Number Decoder shows how the fields line up.

Keep Protection Work Inside the GE Procedure

We supply and identify the correct emergency-trip hardware; we do not publish trip setpoints, the voting arrangement, or online/offline test procedures. Those are covered by GEH-6421 (Mark VI System Guide) and by your plant’s written protection procedures, which should always govern any work in the trip path. For related protection and control hardware, see the GE Speedtronic Turbine Control Boards and GE Mark VI IS200 Boards collections.

Details for an Accurate TREG Quote

Send the full part number and suffix (IS200TREGH2BDC), the board-label revision and a photo of it, your turbine model and control generation, the protection circuit voltage, whether the arrangement is simplex or redundant, the quantity, and your timeline. That lets us confirm the correct 24 V dc board before anything ships.

Request a Quote for the IS200TREGH2B

This IS200TREGH2B is available worldwide on DDP terms, quoted within 24 hours, with purchase orders accepted from qualified buyers. Use Request a Quote, tell us the quantity, and we will confirm availability and lead time.

IS200TREGH2BDC Reference (Tested Unit)

General Information about the Product
Part Number	IS200TREGH2B Mark VI IS200
Description	GE General Electric IS200TREGH2B IS200TREGH2BDC Gas Turbine Emergency Trip Board Mark VI
Condition	used Clean and Tested. With 1 Year Warranty.