IS200TREGH5B: a Redundant-TREG Variant

The IS200TREGH5B is a GE Mark VI turbine emergency trip terminal board built specifically for redundant-TREG arrangements, offered here as new-surplus, open-box stock. It shares the emergency-trip role of the rest of the family, but its H5 group identity has a specific meaning tied to how power is fed in a dual-board protection layout — and getting that identity right is the whole point of this page. Trip settings, voting, and test steps are deliberately left to GE’s manual and your plant procedures; here we focus on identifying the correct board.

Why the H5B’s Power Source Matters

GE builds several closely related H-group emergency-trip boards. The H1B is the standard 125 V dc board; the H3B, H4B and H5B are variants used where two TREG boards run in a redundant configuration. In that layout each variant draws the power for its feedback and economizing circuitry from a single dedicated connector so that control power stays cleanly separated between the two boards — the H3B from JX1, the H4B from JY1, and this H5B from JZ1. Because that separation is engineered into the system, GE is explicit that repairs and replacements must use the correct board type. Substituting a different variant can defeat the power-separation scheme, so an H5B position must be filled by an H5B board.

The Board’s Place in the Mark VI Trip Path

Physically, the IS200TREGH5B is the field-wiring termination for the emergency-trip circuit: emergency-stop and protection trip-interlock wiring lands here along with the trip-solenoid connections, with the TREG providing the positive side of the solenoid DC power and the companion TRPG board the negative side. It is driven by the VPRO protection processor in Mark VI (or a PPRO pack on SPRO in Mark VIe) through molded-plug cabling. As a terminal board it holds no logic of its own; the protection module does the work and reports the diagnostics.

Identifying a Fault Without Touching the Trip Logic

Because the board is passive, most trip-circuit faults are found and reported by the protection module, not the board. Read the VPRO (or PPRO/SPRO) fault log first. A hardware-incompatibility fault typically indicates an ID-device or revision mismatch at the JX1/JY1/JZ1 plugs — a real risk if the wrong variant was fitted — or a cable problem. Field-side faults in the emergency-stop string or interlocks show up at the board but live in the field. Only visible physical damage, such as cracked blocks, corroded terminals, or connector damage, makes the board itself the part to replace. For anything in the protective function, defer to the GE procedure.

Decoding IS200TREGH5BDC

The number reads as IS200 (Mark VI series), TREG (emergency-trip function), H5 (the JZ1-fed redundant-TREG hardware group), B (functional revision), and the closing DC on IS200TREGH5BDC (artwork revision). Match the full string, and in redundant systems confirm the position calls for the H5B specifically. See the GE Speedtronic Part Number Decoder for the field-by-field breakdown.

Open-Box Unit: What to Include in Your Request

This IS200TREGH5B is new-surplus stock in an opened box, carrying the warranty shown below. To confirm the match, send the full part number (IS200TREGH5BDC), the label revision and a photo, your turbine model and Mark VI generation, the redundant-protection details, the quantity, and your required date. Related protection and control boards are in the GE Speedtronic Turbine Control Boards collection.

Request a Quote on the IS200TREGH5B

We ship the IS200TREGH5B worldwide on DDP terms, quote within 24 hours, and accept purchase orders from qualified plants and integrators. Press Request a Quote with your quantity and we will confirm this open-box unit’s availability and lead time.

IS200TREGH5BDC Open-Box Reference

General Information about the Product
Part Number	IS200TREGH5B Mark VI IS200
Description	GE General Electric IS200TREGH5B IS200TREGH5BDC Trip Emergency Board OPEN BOX
Condition	newSurplusNoBox Cleaned and Tested. With 1 Year Warranty.