1. Product Title

GE IS400TRLYS1B – Mark VIe Relay Output Terminal Board

2. Product Overview

The GE IS400TRLYS1B is a relay output terminal board designed for use in GE Mark VIe and Mark VIeS turbine control systems. Developed by General Electric, this module provides isolated relay outputs that allow digital commands from the control system to actuate external field devices such as solenoid valves, alarms, pumps, and interlock circuits.

Within the Mark VIe architecture, the GE IS400TRLYS1B functions as the interface between low-voltage digital logic and higher-power field loads. It receives commands from the control processor through an associated I/O pack and converts them into reliable mechanical relay switching. Designed for both simplex and triple-modular-redundant (TMR) safety configurations, the GE IS400TRLYS1B ensures secure actuation and high system integrity in critical turbine control applications such as power generation and industrial rotating equipment protection.

3. Technical Specifications

• Product Model: GE IS400TRLYS1B

• Brand: GE

• Warranty: One Year

• Input Voltage: 24 V DC nominal (18–32 V DC operational range)

• Operating Temperature: –30 °C to +65 °C

• Storage Temperature: –40 °C to +85 °C

• Response Time: Relay operate ≤10 ms, release ≤5 ms

• Protection Class: Industrial control cabinet installation

• Accuracy Class: Industrial control relay switching accuracy

• Output Frequency: Discrete relay switching (event-driven)

• Rated Current Range: Up to 2 A switching per relay contact (typical rating)

• Communication Interface: Mark VIe I/O pack interface

• Supported Protocols: GE Mark VIe internal system communication

• Overload Capacity: Designed for industrial relay load switching

• Dimensions: Approx. 178 × 330 × 160 mm

• Output Channels: Up to 16 Form-C relay outputs (depending on configuration)

4. Main Features and Benefits

Relay-Based Field Device Control:
The board provides multiple isolated relay outputs that allow the Mark VIe controller to operate field equipment such as valves, motors, annunciators, and safety interlocks.

Compatibility with Redundant Architectures:
Designed for both simplex and TMR control architectures, enabling high reliability and fault-tolerant operation in turbine protection systems.

High Electrical Isolation:
Electromechanical relays provide galvanic isolation between control electronics and field circuits, ensuring safe operation when switching inductive loads or higher-voltage signals.

5. Application Scenarios

Gas Turbine Control Systems:
Used in turbine control panels to drive fuel shutoff valves, auxiliary pumps, and protective trip circuits.

Steam Turbine Power Plants:
Interfaces with field devices responsible for turbine governing, lubrication systems, and cooling equipment.

Industrial Rotating Machinery Protection:
Provides reliable relay actuation in compressor trains, generator protection systems, and critical process equipment.

6. Frequently Asked Questions (FAQ)

Q: What are the main functions of GE IS400TRLYS1B?
A: It converts digital control signals from the Mark VIe control system into isolated relay outputs used to actuate external devices such as valves, alarms, and interlock systems.

Q: Is GE IS400TRLYS1B compatible with legacy systems?
A: Yes. It is designed for GE Mark VIe and Mark VIeS turbine control platforms and can be used as a replacement terminal board within compatible relay output assemblies.