IS200TREGH1B: the Current 125 V dc Emergency Trip Board

The IS200TREGH1B is the 125 V dc turbine emergency trip terminal board that GE uses in place of the earlier H1A for new Mark VI production. It sits in the protection path of the Speedtronic control, terminating the emergency-trip field wiring and interfacing it to the protection module. As an emergency-trip component it is safety-related, so this description stays at the level of identification and sourcing — trip settings, voting and testing belong to the GE manual and your plant’s procedures.

From H1A to H1B: What Changed for New Production

GE documents the H1B as the main version for 125 V dc emergency-trip applications and the one adopted in place of the H1A. In practical terms, if you are holding an H1A and looking to standardize on current hardware, the H1B is the natural successor; if your system is already built around H1B boards, match H1B when you order. Where two TREG boards run in a redundant layout, note that GE also offers dedicated variants (H3B, H4B, H5B) that keep control power separated — so confirm whether your position calls for a standard H1B or one of those redundant variants before you buy.

Role in the Mark VI Protection Group

The IS200TREGH1B provides the positive side of the trip-solenoid DC power, working with the TRPG board (the negative side) and the TPRO turbine-protection board, all under the VPRO emergency-trip/protection processor. Field wiring for the emergency stop and the protection trip interlocks lands on the board’s terminal blocks alongside the solenoid connections. Connection to the protection module is by molded-plug cables; in a Mark VIe protection system the board is managed by a PPRO pack on the SPRO board instead. The JX1, JY1 and JZ1 connectors each carry an ID device the processor reads to verify board type, revision and plug location.

Diagnosing a Trip-Circuit Symptom on a Passive Board

Because the terminal board holds no logic, a trip-circuit symptom is usually reported and resolved at the protection module rather than the board. Read the VPRO (or PPRO/SPRO) diagnostics first; hardware-incompatibility faults point to an ID or revision mismatch at JX1/JY1/JZ1 or a cable problem; and field faults in the emergency-stop string or interlocks surface at the board but originate in the field. The board itself is the part to replace only when it is physically damaged. Keep any work that touches the protective function inside the GE procedure.

IS200TREGH1BDB Suffix Fields and Documentation

The number decomposes as IS200 (Mark VI series), TREG (emergency-trip function), H1 (hardware group, 125 V dc), B (functional revision), and on the full IS200TREGH1BDB the trailing DB (artwork revision). For the field-by-field logic see the GE Speedtronic Part Number Decoder; for the protective function itself, refer to GEH-6421 (Mark VI System Guide) and your plant procedures. Related boards are grouped in the GE Speedtronic Turbine Control Boards collection.

Information to Include With Your Quote Request

To confirm the exact board, send the full part number with suffix (IS200TREGH1BDB), the label revision and a photo, your turbine model and Mark VI generation, whether the protection is simplex or redundant, the quantity, and your required timing.

Request a Quote on the IS200TREGH1B

We supply the IS200TREGH1B worldwide on DDP terms, return quotes within 24 hours, and accept purchase orders from qualified plants and integrators. Select Request a Quote, enter your quantity, and our team will confirm availability and lead time.

IS200TREGH1BDB Tested-Unit Reference

General Information about the Product
Part Number	IS200TREGH1B Mark VI IS200
Description	IS200TREGH1B By GE IS200TREGH1BDB Emergency Trip Board MK VI IS200
Condition	used Cleaned and Tested. With 1 Year Warranty.