Product Overview
The GE 350-007650-83H C is a specialized terminal interface printed circuit board engineered for use within General Electric’s Speedtronic™ Mark V turbine control system, one of the most widely deployed industrial automation platforms in global power generation. This subassembly functions as a critical signal routing and field-wiring interface, typically mounted inside I/O pack enclosures to connect external sensors—such as thermocouples, RTDs, or millivolt transducers—to the main analog input processing cards like the DS200TCQAG1A. By providing a robust, electrically isolated pathway from plant floor instrumentation into the controller’s sensitive electronics, the GE 350-007650-83H C ensures accurate temperature monitoring essential for turbine protection, efficiency optimization, and regulatory compliance.
Designed for integration into high-availability environments, the GE 350-007650-83H C features screw-terminal blocks for secure field connections, transient suppression components, and precision signal conditioning traces. The “C” suffix confirms the presence of conformal coating—a vital enhancement that shields the board from moisture, dust, salt spray, and chemical contaminants commonly found in fossil fuel plants, hydro stations, and offshore oil & gas facilities. Though not a standalone field-replaceable unit, this module plays an indispensable role in maintaining signal integrity across decades-long operational lifespans, making it a cornerstone of legacy system sustainability and brownfield modernization efforts worldwide.
Technical Specifications
Parameter Name Parameter Value
Product Model 350-007650-83H C
Manufacturer General Electric (GE Power / GE Vernova)
Product Type Terminal Interface Subassembly / Signal Routing PCB
Compatible System Speedtronic Mark V Turbine Control Platform
Primary Application Thermocouple & low-level analog sensor interfacing
Terminal Type Screw-clamp terminals (typically 3.5–5.0 mm pitch)
Conformal Coating Yes (urethane or acrylic, per MIL-I-46058C)
Electrical Isolation Basic insulation; reinforced by system-level design
Operating Temperature -20°C to +70°C
Mounting Method Panel-mounted within I/O pack chassis (e.g., 20H9995G01)
Dimensions Approx. 150 mm × 100 mm × 15 mm (varies by revision)
Associated Main Board DS200TCQAG1A, DS200AIDA, or similar Mark V analog I/O cards
Main Features and Advantages
Signal fidelity and long-term reliability define the value proposition of the GE 350-007650-83H C. Unlike generic terminal strips, this board is engineered as an integral part of GE’s closed-loop control architecture, with trace impedance, grounding topology, and component placement optimized for microvolt-level thermocouple signals. Its layout minimizes thermal EMF errors and electromagnetic interference—critical when measuring exhaust gas or bearing temperatures where ±1°C accuracy can influence trip decisions.
The conformal coating on the GE 350-007650-83H C significantly extends service life in humid or corrosive environments, preventing dendritic growth and leakage currents that could otherwise cause false alarms or drift. Additionally, the board often incorporates fuse holders or current-limiting resistors on select channels, adding a layer of overcurrent protection for both field wiring and the downstream I/O card. This design philosophy aligns with GE’s emphasis on fail-safe operation in safety-critical turbine applications.
Another key advantage is mechanical robustness. The GE 350-007650-83H C uses high-retention terminal blocks rated for repeated wire insertion/removal without loosening—essential during maintenance outages. Its edge connector or ribbon cable interface ensures secure mating with the main I/O processor, reducing intermittent faults caused by vibration. For plants managing aging infrastructure, this subassembly enables cost-effective repairs without replacing entire I/O packs, preserving capital while maintaining OEM-grade performance.
Application Field
The GE 350-007650-83H C is predominantly deployed in thermal power generation facilities where precise temperature monitoring directly impacts turbine safety and efficiency. In coal- and gas-fired plants, it interfaces with exhaust thermocouples on heavy-duty Frame 7/9 turbines, feeding real-time data to the Mark V controller for combustion tuning and overtemperature protection. Similarly, in combined-cycle configurations, the GE 350-007650-83H C supports heat recovery steam generator (HRSG) tube wall monitoring, preventing catastrophic failures during rapid ramping.
Beyond conventional power, the GE 350-007650-83H C is also found in hydroelectric stations, where it connects stator winding RTDs to monitor generator health during load swings. In industrial settings such as refineries and petrochemical complexes, it enables reliable temperature feedback from compressors and steam turbines integrated with GE control systems. Even in marine propulsion applications aboard LNG carriers, this terminal board ensures stable sensor connectivity despite constant vibration and salt-laden air.
Its enduring relevance stems from the global installed base of Mark V systems—many operating since the 1990s—where the GE 350-007650-83H C serves as a linchpin for sustaining operational continuity during component obsolescence challenges. As plants extend asset life through life-cycle management programs, this subassembly remains a trusted solution for maintaining signal chain integrity without full system replacement.
Related Products
DS200TCQAG1A: Primary thermocouple input processing board that mates with 350-007650-83H C
DS200AIDAG1A: Analog input board for 4–20 mA/0–10 V signals, may use similar terminal subassemblies
20H9995G01: Standard Mark V I/O pack chassis housing the 350-007650-83H C and main I/O cards
350-007650-83G: Alternate revision with minor terminal layout or grounding differences
DS200SDCCG1A: Servo control card often co-located in same I/O rack
Mark V CPR: Central processor module coordinating all I/O, including data from 350-007650-83H C-linked sensors
IS200TREGH1A: Later-generation terminal board used in Mark VIe for similar functions
GEH-6196: Official Mark V I/O manual referencing 350-007650-83H C wiring diagrams
Installation and Maintenance
Pre-installation preparation: Before installing the GE 350-007650-83H C, verify compatibility with your specific I/O pack configuration and main board revision—mismatched terminal layouts can cause wiring errors or short circuits. Ensure the I/O chassis is de-energized and follow proper lockout/tagout (LOTO) procedures. Inspect the board for physical damage, lifted traces, or degraded conformal coating, especially if sourced as surplus. Confirm that terminal block screws are fully seated and that the edge connector pins are straight and free of oxidation. Use only stranded, shielded thermocouple extension wire with proper polarity when connecting field sensors.
Maintenance recommendations: During routine outages, inspect the GE 350-007650-83H C for signs of overheating, corrosion, or loose terminals—common failure points in high-vibration zones. Retorque terminal screws to manufacturer specifications to prevent intermittent opens. If temperature readings drift or show noise, isolate the issue by testing continuity from the field sensor through the GE 350-007650-83H C to the main I/O card. Store spare units in anti-static, humidity-controlled packaging to preserve coating integrity and prevent PCB delamination. Never attempt to clean with aggressive solvents that may dissolve the conformal layer.
Product Guarantee
Every GE 350-007650-83H C we supply undergoes rigorous visual and functional inspection to ensure it meets original GE manufacturing standards, including verification of conformal coating coverage and terminal block integrity. We guarantee that each unit is either new surplus from verified inventory or professionally refurbished using OEM-grade materials and processes. Backed by a 24-month warranty against defects in workmanship and materials, our GE 350-007650-83H C modules are tested for dimensional accuracy, pin alignment, and compatibility with standard Mark V I/O packs. Our team of certified GE automation engineers provides lifetime technical support to assist with integration, troubleshooting, and lifecycle planning—ensuring your legacy control system remains reliable, compliant, and operational for years to come.
