Product Core Brief
- Models: NRD108034 / 8RDB44674G01 / SA44674.C
- Brand: ALSTOM
- Series: ALSTOM Relay Output Module Family
- Core Function: Relay output module used to provide discrete trip, close, alarm, permissive, and interlock outputs in ALSTOM protection, control, and auxiliary cabinets.
- Product Type: Relay Output Module / Discrete Output Board / Plug-In Control Card
- Key Specs: Backplane-supplied power | Proprietary host interface | Status indication | Revision-dependent relay count and ratings | Exact channel map, contact rating, and communication depend on installed build
- Condition: New Original / New Surplus
Product Introduction
ALSTOM NRD108034 8RDB44674G01 SA44674.C is an ALSTOM relay output module referenced in spare-part channels as a discrete output board for ALSTOM rack-based control and protection systems. It is typically installed as a plug-in card inside an ALSTOM host chassis, protection cabinet, or auxiliary control rack.
The module is used to convert controller commands into relay contact outputs for alarm annunciation, breaker trip/close signals, permissives, interlocks, and discrete control loops. It communicates with the host controller through a proprietary backplane interface and does not usually carry independent Ethernet, fieldbus, or analog measurement ports on the front panel. Some third-party listings attach unrelated communication adapter, analog metering, or HMI features to similar ALSTOM board families; those descriptions should not be used as the basis for replacing this module.
Key Technical Specifications
| Parameter | Value |
|---|---|
| Full Model | ALSTOM NRD108034 8RDB44674G01 SA44674.C |
| Product Type | Relay output module / discrete output board |
| System Platform | ALSTOM rack-based control and protection systems |
| Core Function | Discrete relay outputs for trip, close, alarm, permissive, and interlock |
| Relay Outputs | Channel count and contact rating depend on installed revision; confirm from nameplate |
| Power Supply | Backplane-supplied; confirm from installed nameplate |
| Communication | Proprietary backplane interface to host controller |
| Installation | Plug-in rack module for ALSTOM chassis |
Quality Control Process
- Visual and code check: Confirm NRD108034, 8RDB44674G01, and SA44674.C markings, revision code, and connector condition.
- Nameplate verification: Confirm function label, relay output count, contact rating, supply voltage, and compatible ALSTOM chassis.
- Backplane interface check: Inspect plug-in connectors, pin alignment, and chassis slot compatibility.
- Functional check: Verify relay pickup/drop-out, contact continuity, LED/status indication, and host recognition where test fixtures allow.
- Final packing: Record test results, apply asset labels, and ship with connector and PCB protection.
Replacement Pitfall Guide
❗ Confirm all three identifiers. NRD108034, 8RDB44674G01, and SA44674.C are commonly listed together; still, verify the exact revision.
❗ Do not treat it as an Ethernet gateway, analog metering module, or CPU board. Public spare descriptions do not confirm independent communication ports or measurement functions for this relay output board.
❗ Verify relay count and contact rating. The installed nameplate and panel drawing must take priority over generic listings.
❗ Check chassis and slot type. The board must match the ALSTOM plug-in slot, backplane pinout, and host configuration.
❗ Confirm I/O mapping. Trip, close, alarm, permissive, and interlock outputs should be verified against the original cabinet drawing before commissioning.
Keep these in mind and you’ll cut 90% of rework time.
Compatibility Matrix & Benchmarks
| Original Model | Replacement / Successor Model | Compatibility Level | Migration Notes |
|---|---|---|---|
| ALSTOM NRD108034 8RDB44674G01 SA44674.C | Same relay output revision | Direct | Like-for-like when revision, contact rating, slot, and host match. |
| ALSTOM | Other ALSTOM relay output board | Needs Adaptation | Confirm channel count, contact rating, backplane type, and I/O mapping. |
| ALSTOM relay output board | Non-ALSTOM relay module | Not Recommended | Backplane, addressing, and host configuration are typically incompatible. |
| ALSTOM relay output board | Modern digital output module | Needs Adaptation | Requires I/O review, wiring changes, and commissioning support. |
- Typical use: Substation protection and control cabinets, power plant auxiliary systems, industrial MCC/PLC panels, rail traction and signaling cabinets, legacy ALSTOM host gear, and discrete output expansion.
- Key verification points: NRD108034 / 8RDB44674G01 / SA44674.C revision, relay count, contact rating, supply voltage, chassis model, slot position, backplane interface, and host I/O map.
