Product Overview

• Part No: NRD108028, 8RDB43655, SA43655.E
• Brand: ALSTOM

• Category: Digital Input & Output Control ModuleNRD108028 8RDB43655 SA43655.E is a standard Eurocard draw-out printed circuit board within ALSTOM legacy turbine control architecture. It serves as a multi-channel digital I/O interface responsible for acquiring binary feedback signals from valves, actuators and auxiliary equipment, and outputting logic interlock, alarm and trip commands. The three designations belong to the same hardware assembly: NRD108028 is the project part number, 8RDB43655 represents the base board identifier, and SA43655.E denotes the official PCB revision. Equipped with built-in signal filtering, surge suppression and channel isolation circuits, it ensures stable signal transmission under heavy electromagnetic interference inside power plant control cubicles. It is an obsolete original maintenance spare widely used for overhaul of steam turbine governing systems and gas turbine protection cabinets.

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Core Features

• Multi-channel digital signal acquisition and logic command output for field process equipment
• Galvanic channel isolation to reduce signal crosstalk and external electrical interference
• Front panel LED diagnostic indicators for channel status and module fault identification
• Standard Eurocard rack plug-in construction supporting rapid on-site module replacement
• Reliable backplane bus communication for real-time data exchange with master controllers
• Reinforced multilayer PCB layout with ESD and transient overvoltage protection

• Verified compliance with EMC, vibration and wide-range thermal cycling reliability tests

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Technical Specifications

• Operating Supply: 24 VDC
• Operating Temperature: -10°C ~ +60°C
• Storage Temperature: -40°C ~ +85°C
• Form Factor: Standard Eurocard rack plug-in printed circuit board

• Protection Class: IP20 when installed inside control cabinet

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Compatibility & Application

• Compatible with ALSTOM legacy steam turbine governing and gas turbine protection control platforms
• Widely deployed in thermal power plants, combined-cycle power stations and captive power facilities
• Applied for turbine interlock signal transmission, auxiliary equipment status collection and protection trip logic output