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ABB GDC780BE21 3BHE004468R0021 Interface Board

The GDC780BE21 3BHE004468R0021 is a plug-in digital signal interface board applicable to ABB power control and excitation automation systems. It serves as the signal distribution channel between main control boards and field discrete equipment, collecting contact status signals and outputting relay control commands. High-density terminal blocks facilitate field wiring arrangement and maintenance debugging. Built-in surge suppression and isolation components prevent transient voltage damage to main control circuits. Onboard configuration jumpers support flexible logic setting according to site control demands. The conformal coated circuit board adapts to continuous operation in power plant and heavy industrial environments. It is widely used as spare component for the renovation and maintenance of legacy ABB power automation equipment.
Tag：

ABB GDC780BE21, 3BHE004468R0021
Brand: ABB
Model: GDC780BE21, Part No: 3BHE004468R0021
Product Name: Digital I/O Signal Interface Board
Country of Origin: Sweden
HS Code: 8537101190
Overall dimension: 261mm × 196mm × 20mm
Net weight: 0.34 kg


Technical Specifications & Features
Operating temperature range: -20°C ~ +60°C
Storage temperature range: -40°C ~ +85°C
Humidity condition: 5% to 95% non-condensing
Power supply: Low-voltage DC power supplied by rack backplane
Hardware interface configuration: Multi-pin edge connectors for rack interconnection; high-density screw terminal blocks; configurable function jumpers and test points
Signal type: Discrete digital input signal; digital relay contact output signal
Core characteristics: Electrical isolation between control side and field wiring; integrated transient overvoltage protection; conformal coated PCB; compact Eurocard structure; built-in LED status indicators; excellent anti-electromagnetic interference performance
Installation form: Standard plug-in PCB board installed inside ABB control rack
Main function: Discrete signal termination and distribution, collection of field equipment status, output of safety interlock and auxiliary control signals
Application scenarios: Generator excitation control systems, medium voltage distribution automation, industrial turbomachinery auxiliary control, ABB legacy power control system spare replacement

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