Description
Product Overview
The ALSTOM NRD108033 8RDC44667G01 SA44667.C is a legacy ALSTOM rack-mounted control/interface module. The three identifiers—NRD108033, 8RDC44667G01, and SA44667.C—are repeatedly listed together, making the complete identification important when sourcing a replacement. Available catalog evidence classifies the assembly as an ALSTOM control module rather than a conventional standalone PLC CPU.
The ALSTOM NRD108033 operates within a larger rack-based control architecture, where its exact function depends on the host system, rack position, associated boards, and application configuration. One source describes it as a rack-mounted control/interface module supplied through the system backplane. Another source categorizes it as a VME digital relay-output board, but publishes detailed electrical specifications that are not independently corroborated. This distinction is important: the board should not be assigned a specific I/O count or relay rating solely from reseller descriptions.
The SA44667.C identifier should also be treated as a significant configuration/revision reference. When replacing a legacy board, matching only “NRD108033” is less precise than matching the complete NRD108033 / 8RDC44667G01 / SA44667.C combination. Related ALSTOM boards such as NRD108028, NRD108034, and NRD109475 belong to the same broader product grouping but carry different hardware identifiers and should not be presumed interchangeable.
Technical Specifications
| Parameter | Specification |
|---|---|
| Manufacturer | ALSTOM |
| Primary Model | NRD108033 |
| Hardware Number | 8RDC44667G01 |
| Revision / Designation | SA44667.C |
| Product Type | Industrial Control / Interface Module |
| Architecture | Legacy ALSTOM rack-based system |
| Installation | Plug-in rack/backplane |
| Power Source | System backplane |
| Supply Voltage | Not reliably confirmed |
| CPU | Not reliably confirmed |
| Memory | Not reliably confirmed |
| Digital Inputs | Not reliably confirmed |
| Digital Outputs | Not reliably confirmed |
| Relay Outputs | Reported by secondary sources; exact configuration requires verification |
| Analog I/O | Not reliably confirmed |
| Communication | System/backplane dependent |
| External Network | Not reliably confirmed |
| Firmware | System dependent |
| Operating Temperature | Not reliably confirmed |
| Dimensions | System/rack dependent |
| Condition | New Surplus, subject to inspection and functional testing |
One secondary source reports a 12 VDC internal logic supply, 16 relay outputs rated at 2 A / 240 VAC, isolated RS-485 up to 115.2 kbps, and 2.5 kV isolation. These values are not sufficiently corroborated to be treated as guaranteed specifications for every assembly.
Another listing states that the board is backplane-powered and designed as a plug-in card for an ALSTOM cabinet. That is a more defensible system-level description.
NRD108033
Main Features and Advantages
Exact Hardware Identification
The strongest practical feature of this assembly is its specific hardware identification:
→ 8RDC44667G01 → SA44667.C
For obsolete control equipment, this complete chain is much more useful than a generic description such as “ALSTOM control card.”
Rack-Based Integration
The board is identified as a plug-in module for an ALSTOM rack architecture. Secondary documentation describes power being provided through the system backplane rather than through a separate field power connection. This reduces the risk of assuming that the board has the same power interface as an independently powered PLC module.
Legacy-System Maintenance
The is relevant when maintaining an installed legacy control cabinet where replacing the entire control platform would require extensive engineering, testing, and commissioning work.
A matching spare can preserve the existing rack arrangement, wiring architecture, and application configuration, provided the hardware revision is compatible.
Revision Control
The designation should be recorded during procurement. Two boards with the same basic NRD family number can have different hardware configurations, and related boards such as SA44674.C and SA44670.E should not be treated as equivalents simply because their identifiers look similar.
Field Replacement Considerations
Before installation, verify:
- Complete part number
- Board revision
- Rack slot
- Connector arrangement
- Backplane compatibility
- I/O assignment
- Firmware/application configuration
- Relay/contact configuration if applicable
- Power requirements
- Diagnostic behavior
Related ALSTOM Products
- NRD108028 / 8RDB43655 / SA43655.E — Related ALSTOM control module. It has a different board identifier and should not be treated as a direct substitute.
- NRD108034 / 8RDB44674G01 / SA44674.C — Closely related NRD-series control module, but with different hardware identification.
- NRD109475 / 8RDA44670G01 / SA44670.E — Another NRD-series ALSTOM control module with a different hardware configuration.
- NRD108031 / TRVC070999000 / BOTTOM — Related ALSTOM control hardware in the same product grouping.
- N897066510E / N897066010M / AOVD / N897066000A — Analog-output hardware; functionally different from .
- N897163510Q / N897163050Q / MODEM / N897163100U — Communication/modem hardware; not a substitute for .
- N897093511D / N897093051D / DIAGNOSTICA / N897093400H — Diagnostic hardware serving a different system role.
Frequently Asked Questions
What is ALSTOM used for?
It is an ALSTOM legacy rack-mounted control/interface module. The exact control or I/O function depends on the host architecture and installed configuration.
Is a digital relay-output board?
Some secondary sources specifically describe it as a VME digital relay-output board. However, the published channel and electrical ratings are not sufficiently corroborated. For engineering documentation, I would describe it more conservatively as an ALSTOM control/interface module unless the original system drawing confirms the relay-output function.
Is 8RDC44667G01 interchangeable with 8RDB44674G01?
No automatic substitution should be made.
The two assemblies are:
- → 8RDC44667G01 → .C
- NRD108034 → 8RDB44674G01 → SA44674.C
Their different hardware identifiers indicate different configurations.
Can be hot-swapped?
Do not assume hot-swap capability. If the module participates in relay or control functions, removing it while energized can change field states or interrupt control functions.
Follow the applicable ALSTOM maintenance procedure.
Does the board require a separate power supply?
Available information indicates a backplane-powered architecture, but the exact rack supply should be confirmed from the host system documentation. Do not connect an external supply based on generic reseller specifications.
How should I verify a replacement?
For a critical spare, verify:
- 8RDC44667G01
- PCB revision
- Rack/backplane compatibility
- Connector condition
- Configuration settings
- Firmware/application compatibility
- I/O or relay assignments
- Controlled power-up and functional testing
Procurement judgment: The defensible identification is ALSTOM / 8RDC44667G01 / .C, a legacy rack-based control/interface module. Public sources disagree on detailed electrical and I/O specifications, so those figures should not be treated as guaranteed without the original ALSTOM documentation. For a plant-critical replacement, the complete part-number chain, hardware revision, rack position, and functional test results should drive acceptance.
