Description
Overview
The IS200TRLYH1B relay output terminal board is part of GE’s Mark VIe turbine control platform and is designed to provide high‑integrity relay outputs for safety‑critical turbine protection systems. It implements a triple‑modular‑redundant (TMR) relay architecture, ensuring that shutdown and protection commands are validated through a three‑channel voting mechanism before being sent to field devices.
Functional Architecture
The board contains three independent relay sections—R, S, and T—each equipped with twelve sealed relays. These relays are combined through a voting circuit to produce twelve final output channels. Depending on system configuration, the voted output can be Form A (normally open) or Form B (normally closed). This voting logic significantly reduces the risk of false trips and enhances operational reliability in turbine protection systems.
The IS200TRLYH1B receives control signals from three separate I/O processors via connectors JR1, JS1, and JT1. Each processor powers its own relay coil group, ensuring electrical isolation between TMR channels and preventing cross‑channel interference.
Power Distribution Compatibility
The board does not include onboard power distribution. When field solenoids or external loads require fused power, GE offers optional distribution boards such as IS200WPDFH1A or IS200WPDFH2A. These modules provide fused 24 VDC, 125 VDC, or 115 VAC power depending on system requirements.
Mechanical and Environmental Design
Built for turbine‑grade environments, the IS200TRLYH1B uses industrial‑grade components and a rugged PCB assembly. It is suitable for Class I Division 2 installations and includes conformal coating for protection against moisture and airborne contaminants. The board’s layout supports easy wiring access and clear identification of relay groups.
Technical Specifications
| Parameter |
Specification |
| Model |
IS200TRLYH1B |
| Product Type |
Relay Output Terminal Board |
| Brand |
General Electric |
| Product Range |
Mark VIe |
| Relay Architecture |
TMR (R, S, T channels) |
| Total Relays |
36 (12 per TMR section) |
| Output Type |
Voted Form A (NO) or Form B (NC) |
| Input Control |
JR1, JS1, JT1 from I/O processors |
| Supported Voltages |
24/125 VDC or 115 VAC |
| Power Distribution |
External (via WPDF boards) |
| Certifications |
Class I Division 2 |
| Weight |
1.4 kg |
| Dimensions |
33 × 17.8 × 5.5 cm |
| HS Code |
8537101190 |
| Minimum Order |
1 unit |
| Origin |
USA |
| Availability |
In stock |
| Lifecycle Status |
Active |
Application Scenarios
-
Gas and steam turbine trip and protection systems
-
High‑reliability TMR control architectures
-
Shutdown solenoid actuation in power plants
-
Safety‑critical DCS installations requiring validated relay outputs
FAQ
Q: Does the IS200TRLYH1B support simplex systems? A: No. It is designed exclusively for TMR‑based Mark VIe architectures.
Q: What is the difference between IS200TRLYH1B and TRLY1F? A: The H1B version provides voted Form B (NC) outputs, while TRLY1F provides Form A (NO) outputs.
Q: Can the board supply power to field solenoids? A: Power distribution is external and requires optional WPDF modules.
