Description
Overview
The IS200TRLYH1BGG Relay Output Terminal Board from General Electric is a high‑integrity output module engineered for Mark VIe turbine control platforms. Designed for demanding turbine protection and shutdown architectures, this board implements a Triple Modular Redundant (TMR) relay structure to ensure dependable output voting and fault‑tolerant operation.
Technical Features
The board integrates 36 environmentally sealed relays arranged into three fully independent sections (R, S, and T). Each section provides 12 Form A normally‑open relay outputs, which are combined through a hardware voting circuit to produce 12 high‑reliability output channels. This design supports safe‑state behavior in hazardous locations and critical turbine trip systems.
Electrical and Functional Characteristics
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Operating voltages: 24 VDC, 125 VDC, or 115 VAC
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Logic power: 28 VDC supplied by associated I/O processors
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Relay type: SPDT, 10 A switching capability
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Output configuration: Form A (NO) voted contacts
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TMR input connectors: JR1, JS1, JT1
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Independent power domains for R/S/T sections
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Compatible power distribution option: IS200WPDFH1A (fused AC/DC field power)
Mechanical and Installation Details
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Mounting: DIN‑rail installation
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Wiring: Two terminal blocks supporting #12 AWG conductors
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Shielding: Integrated grounding strip for cable shields
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Dimensions: 33 × 17.8 × 5.5 cm
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Weight: 1.42 kg
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Environmental rating: −40°C to +85°C operating range
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Vibration‑resistant construction for turbine enclosures
System Integration
The IS200TRLYH1BGG interfaces directly with Mark VIe I/O processors, which provide relay drive signals and diagnostic feedback. Loss of communication or power automatically de‑energizes the relays, ensuring a predictable failsafe condition. For applications requiring normally‑closed outputs, the TRLY2F variant offers Form B relay configurations.
Applications
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Gas turbine trip systems
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Steam turbine emergency shutdown
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High‑integrity relay voting architectures
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Safety‑critical DCS output modules
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Redundant protection and interlock systems
Technical Specifications Table
| Parameter |
Specification |
| Model |
IS200TRLYH1BGG |
| Product Type |
Relay Output Terminal Board |
| Series |
Mark VIe |
| Relay Count |
36 (12 per R/S/T section) |
| Output Channels |
12 voted outputs |
| Relay Rating |
10 A SPDT |
| Input Connectors |
JR1, JS1, JT1 |
| Operating Voltage |
24/125 VDC or 115 VAC |
| Logic Power |
28 VDC |
| Dimensions |
33 × 17.8 × 5.5 cm |
| Weight |
1.42 kg |
| Origin |
USA |
| System |
DCS |
| Status |
Active production |
FAQ
Q: Does the board support both AC and DC field power? A: Yes. It accepts 24 VDC, 125 VDC, and 115 VAC depending on system configuration.
Q: Is this board suitable for hazardous environments? A: The Form A relay design and sealed construction support Class 1 Division 2 applications.
Q: Can this board be used as a direct replacement for older Mark VI relay boards? A: It is compatible with Mark VIe systems; compatibility with earlier Mark VI hardware depends on system wiring and processor configuration.
