IS230TREAH4A - Aeroderivative Turbine Emergency Trip Terminal Board

IS230TREAH4A - Aeroderivative Turbine Emergency Trip Terminal Board IS230TREAH4A - Aeroderivative Turbine Emergency Trip Terminal Board

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Part Number: IS230TREAH4A
Manufacturer: General Electric
Series: Mark VIe
Function: Turbine Emergency Trip terminal board
Number of Inputs: 3
Number of Outputs: 2
Temperature: -30 to 65°C
MPU pulse rate range: 2 Hz to 20 kHz
MPU pulse rate accuracy: 0.05%
Number of outputs: 2 trip contacts
MPU input circuit sensitivity: 27 mV pk
Availability: In Stock
Size: 33.0 cm x 17.8 cm
Technology: Surface mount
Country of Manufacture: United States (USA)


IS230TREAH4A is an Aeroderivative Turbine Emergency Trip Terminal Board manufactured and designed by General Electric as part of the Mark VIe Series used in GE Distributed Control Systems. It is an integral component of the Mark VIe system, working in conjunction with PPRO turbine I/O packs to ensure reliable and efficient turbine control and monitoring. The terminal board offers various inputs and outputs, providing a comprehensive solution for turbine emergency trip functionality. t also includes daughterboard connectors, offering the option for feature expansion. These connectors provide the capability to integrate additional functionality or modules into the system, enhancing its capabilities and adaptability to specific requirements.


  • Customer Input Terminals: Provides customer input terminals through either two 24-point pluggable barrier terminal blocks (H1A, H2A) or 48 pluggable Euro-style box terminals (H3A, H4A). These input terminals allow for the connection of customer-specific signals and inputs, enabling customization and flexibility in the control system setup.
  • Passive Pulse Rate Devices: The terminal board incorporates nine passive pulse rate devices, with three devices allocated per X/Y/Z section. These devices utilize toothed wheels to measure the turbine speed accurately. By monitoring the rotational speed, the terminal board facilitates precise control and monitoring of the turbine's operational parameters.
  • Jumper Blocks: Jumper blocks are included on the terminal board, enabling the fanning of one set of three-speed inputs to all three PPRO I/O packs. This configuration streamlines the wiring process and ensures consistent speed input signals across the PPRO I/O packs.
  • TMR Voted Output Contacts: Features two TMR (Triple Modular Redundancy) voted output contacts, capable of either 24 V dc (H1A, H3A) or 125 V dc (H2A, H4A). These output contacts serve as the trip signals for the system, enabling rapid and reliable emergency shutdown of the turbine when necessary.
  • Voltage Detection Circuits: Four 24-125 V dc voltage detection circuits are integrated into the board. These circuits are responsible for monitoring the trip string, ensuring that the necessary voltage levels are maintained for proper system operation and trip functionality.
  • For TMR systems, the signals from the terminal board fan out to the JX1, JY1, and JZ1 DC-62 PPRO connectors. This configuration ensures proper signal distribution and synchronization among the PPRO I/O packs in a TMR setup, contributing to the system's fault tolerance and reliability.


  • The voltage detection circuit and the breaker relay are connected to the I/O terminal blocks TB1, while the passive pulse rate pick-ups are connected to TB2. These terminal blocks serve as the interface points for connecting the necessary wires and cables within the system.
  • Each terminal block is securely held in place with two screws, ensuring stable and reliable connections. The terminal blocks are designed to accommodate up to 24 terminals, providing ample space for connecting the required wires. The terminals are capable of accepting wires with a maximum size of #12 AWG, allowing for a wide range of wire sizes to be used in the installation.
  • To ensure proper grounding and shielding, a shield termination strip is attached to the chassis ground and is positioned immediately to the left of each terminal block. This shield termination strip provides a convenient and dedicated location for terminating the shield wires of the connected cables, enhancing the system's electromagnetic compatibility (EMC) performance and minimizing interference.
  • By utilizing these I/O terminal blocks and shield termination strips, the wiring, and connectivity within the system are organized and structured, facilitating easier installation, maintenance, and troubleshooting processes. The robust construction and secure mounting of the terminal blocks ensure reliable and consistent electrical connections, contributing to the overall performance and functionality of the system.

WOC has the largest stock of GE Distributed Control System Replacement Parts. We can also repair your faulty boards. WORLD OF CONTROLS can also supply unused and rebuilt backed-up with a warranty. Our team of experts is available round the clock to support your OEM needs. Our team of experts at WOC is happy to assist you with any of your automation requirements. For pricing and availability on any parts and repairs, kindly get in touch with our team by phone or email.


What are the contact ratings for the trip contacts?

The contact ratings for the trip contacts are NEMA class F.

What is the minimum number of operations the module can handle?

It is designed to handle a minimum of 100,000 operations.

What is the pulse rate range for MPU (Multi-Purpose Unit)?

The MPU pulse rate range is from 2 Hz to 20 kHz.