IS200TBCIH4C - Contact Input with Group Isolation Terminal Board

IS200TBCIH4C - Contact Input with Group Isolation Terminal Board IS200TBCIH4C - Contact Input with Group Isolation Terminal Board

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Part Number: IS200TBCIH4C
Manufacturer: General Electric
Series: Mark VI
Product Type: Contact Input with Group Isolation Terminal Board
Number of channels: 24
Power supply voltage: 28 V dc
Voltage Range: 14 to 32 V dc
Mounting: DIN-rail mounting
Technology: Surface mount
Operating temperature: -30 to 65°C
Size: 33.02 cm high x 17.8 cm
Repair: 3-7 Day
Availability: In Stock
Country of Origin: United States


IS200TBCIH4C is a Contact Input with a Group Isolation Terminal Board manufactured and designed by General Electric as part of the Mark VI Series used in GE Speedtronic Gas Turbine Control Systems. A Group Isolation Terminal Board is an electronic device used to manage and isolate electrical connections from different groups of input or output signals. It is commonly used in industrial and automation systems to ensure signal integrity, safety, and ease of maintenance. The primary purpose of a Group Isolation Terminal Board is to keep electrical signals from one group separate from signals in other groups. This isolation prevents interference and cross-talk between different parts of the system, ensuring that each group operates independently and reliably. The terminal board typically consists of multiple individual terminals or channels, organized into distinct groups. Each group is isolated from the others through internal circuitry or components. This isolation can be achieved using various methods, such as optocouplers or relays, depending on the application's requirements.


  • The configuration of the system involves the integration of 24 dry contact inputs, meticulously interconnected through a direct wiring process. These inputs are seamlessly routed to two distinct I/O terminal blocks that are securely affixed to the terminal board. The terminal board's functionality is further enhanced by these terminal blocks, facilitating the efficient management of input connections.
  • Each of these I/O terminal blocks is firmly anchored in place through the utilization of two screws. This mechanical arrangement not only ensures a secure attachment but also grants the convenience of detachment when required for maintenance activities. This design consideration enhances the overall serviceability of the terminal board, permitting easy access to the terminal blocks for inspection, repair, or replacement as necessary.
  • Within the context of wiring, each of the terminal blocks is generously equipped with a total of 24 terminals. These terminals are meticulously designed to accommodate wires as substantial as #12 AWG, offering a wide range of compatibility to cater to diverse wiring needs. This design aspect facilitates the seamless integration of different wire gauges, thus catering to a variety of application-specific requirements.
  • To maintain a robust grounding configuration, a shield terminal strip is thoughtfully positioned adjacent to each of the terminal blocks. These shield terminal strips are intentionally linked to the chassis ground, reinforcing the system's integrity against electromagnetic interference and other potential disturbances. This strategic placement ensures that grounding is efficiently managed and that any extraneous electrical noise is effectively diverted away from the sensitive components connected to the terminal blocks.


  • Near the entry point of each signal, filters are implemented to effectively diminish high-frequency noise and suppress surge effects. For H1's dry contact inputs, their operation hinges on a floating 125 V DC (ranging between 100-145 V DC) supply sourced from the turbine control system. Before reaching each contact input, the 125 V DC bus undergoes current limitations within the power distribution module.
  • For the H2 and H3 variants, lower voltages are employed as outlined in the provided specification table. The discrete input voltage signals progress onward to the I/O processor, which then channels them through optical isolators. These isolators play a dual role: they establish group isolation, effectively segregating different signal groups, and subsequently transmit the refined signals to the overarching system controller.
  • The isolation circuitry employs a reference voltage to establish a transition threshold that precisely aligns with 50% of the floating power supply voltage applied. Notably, the tracking mechanism is configured to ensure that it doesn't drop below 13% of the nominal rated supply voltage. This strategic clamping serves the purpose of compelling all contacts to signify an open state whenever the voltage experiences a dip below this specified threshold.

WOC has the largest stock of GE Speedtronic Gas Turbine 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 is the purpose of monitoring the excitation voltage?

Monitoring the excitation voltage ensures that the power supply remains within acceptable levels for proper operation. It prevents potential issues caused by inadequate excitation voltage.

What action is taken if the excitation voltage drops below 40% of the nominal voltage?

If the excitation voltage falls below 40 percent of the nominal value, a diagnostic alarm is triggered and latched by the I/O pack. This alarm alerts operators to the voltage drop issue.

How are the inputs associated with the terminal board affected during a test?

As part of a test, all inputs linked to the specific terminal board are forced into the open contact state, ensuring a fail-safe configuration during testing or troubleshooting.