IS200TRLYH1BCB — GE Speedtronic Mark VI Relay Output Terminal Board

The IS200TRLYH1BCB is a terminal board from GE's Speedtronic Mark VI turbine control system, belonging to the IS200 board family. It is a TRLY-type module — a rack-mounted terminal board associated with relay output signal handling within the turbine control cabinet.

The Mark VI platform is one of GE's turbine control systems, used to govern gas and steam turbines in power generation and industrial drive applications. In the Mark VI/VIe architecture, IS200 terminal boards provide the physical connection point for field cabling and interface the control system's input/output signals, typically pairing with an associated I/O pack. The IS200TRLYH1BCB carries the "H1" board designation, a "B" level, and a "CB" revision suffix. The "RLY" component of the designation clearly identifies it as a relay output board — the type used to drive discrete outputs such as trip relays, alarm contacts, and equipment command signals in turbine control.

Key Specifications

Important: Relay count, contact ratings (voltage/current), relay type (e.g. form A/B/C), dimensions, and connector details for the IS200TRLYH1BCB are not consistently documented across public sources. Please confirm these against the board label, GE documentation, or your system manual before ordering, and verify the correct paired I/O pack where applicable.

Product Functions

• Relay output termination: Provides the field-wiring termination point for relay output signals from the turbine control system.
• Discrete output driving: Drives discrete outputs such as trip relays, alarm contacts, and equipment command signals used by the plant.
• I/O pack support: Where applicable, mates with the corresponding I/O pack to provide channel-level relay output for the control system.
• Electrical isolation: Relay-based outputs provide galvanic isolation between the control electronics and field circuits, protecting the control system and improving noise immunity.
• System integration: Operates as part of the modular IS200 board set, coordinating with other boards and I/O packs within the cabinet.
• Rack-mounted modular design: Slots into the control cabinet rack, allowing board-level replacement during maintenance without full system rewiring.
• System lifecycle support: Keeps existing Mark VI/VIe installations operational, supporting spares strategies for ageing turbine control systems.

Application Scenarios

• Gas turbine control: Relay output termination within Mark VI/VIe cabinets for gas turbine sequencing, protection, and command functions.
• Steam turbine control: Relay output interfacing in steam turbine control applications.
• Trip & alarm circuits: Drives trip relays and alarm contacts used in turbine protection systems.
• Equipment command signals: Provides isolated output contacts for controlling auxiliaries and plant equipment.
• Power generation plants: Keeps legacy Mark VI/VIe turbine controls serviceable in utilities managing long-life assets.
• Oil & gas facilities: Support for turbine-driven compressors and mechanical drive applications under Mark VI/VIe control.
• Maintenance & overhaul: Sourced as a spare during scheduled outages to minimise downtime and rewiring effort.
• Legacy system lifecycle support: Supports spares and phased modernization strategies for plants still running Mark VI/VIe controls.

Frequently Asked Questions