Product Overview

The General Electric IS200TREGH1B (revision IS200TREGH1BDB) is a vital Turbine Emergency Terminal Board designed for the Mark VIe control system. Functioning as a high-integrity safety node, this module is engineered to manage emergency shutdown sequences for utility-scale gas turbines. Its primary role is to drive three emergency trip solenoids by supplying positive DC power through a 125V DC circuit. To ensure a fail-safe operation, it works in coordination with the IS200TRPG board, which manages the negative side of the solenoids. This dual-board configuration creates a robust "voting" safety loop, preventing a single hardware failure from causing either an unintentional trip or a failure to shut down when an emergency occurs.

Hardware Parameters and Key Technical Characteristics

The IS200TREGH1B is distinguished by its Triple Modular Redundant (TMR) relay architecture, designed to provide uncompromising reliability in 125V DC environments.

• Manufacturer General Electric (GE)

• Model Designation IS200TREGH1B / IS200TREGH1BDB

• System Architecture Mark VIe Triple Modular Redundant (TMR)

• Relay Array 12 total relays (9 dedicated to 3 independent voting groups)

• Voltage Rating Optimized for 125V DC trip circuits

• Response Performance Ultra-fast emergency trip execution in less than 3ms

• Power Management Diode-combined control power sourced from JX1, JY1, and JZ1 connectors

• Circuitry Design Redundant power supplies for feedback and economizing relays with isolated trip paths

• Physical Weight 2.00 kg

• Dimensions 33.0 x 17.8 x 5.5 cm

• Connectivity Molded-plug cable interfaces for PPRO modules and TRPG boards

• Manufacturing Origin USA

Industrial Applications and Operational Use Cases

This terminal board is the industry standard for emergency protection in demanding turbine-generator environments.

• Emergency Overspeed Protection Monitoring shaft speed via PPRO modules and executing immediate fuel-stop sequences if safety thresholds are breached.

• Fail-Safe Emergency Stops Providing a hardwired interface for manual and automated emergency stop commands that bypass standard governor logic.

• Redundant Solenoid Control Driving three independent trip solenoids using a voting scheme that ensures protection even if one relay group fails.

• Combined-Cycle Power Stations Serving as the core shutdown interface for large frame turbines (7FA/9FA) where uncompromising safety is required for grid stability.

• Critical Fault Diagnostics Utilizing on-board LED indicators to provide maintenance teams with real-time visibility into the status of each relay voting group.

By deploying the IS200TREGH1B, power generation facilities implement a gold-standard safety layer that combines military-grade hardware durability with the sophisticated diagnostics of the Mark VIe ecosystem.