Description
- Brand: ALSTOM
- Full Model Number: 029.148.924
- Lifecycle Status: Obsolete / legacy procurement classification
- Core Function: Low-load trip and motor protection
- Top 3 Technical Specs: Numerical protection relay; low-load/load-loss trip function; motor protection application
- Stock & Condition: Legacy spare availability; condition by individual unit and lot; pre-shipment inspection available
Public product references identify ALSTOM 029.148.924 as a low-load trip relay and also describe it as an advanced numerical motor protection relay.
Supply Chain & Technical Deep Dive
Legacy ALSTOM protection hardware can create a difficult sourcing problem when an installed relay fails unexpectedly. The 029.148.924 reference appears in current industrial spare-part records as a low-load trip relay, giving maintenance teams a precise OEM part number for replacement sourcing rather than substituting an unverified relay family. That distinction matters during emergency procurement because relay settings, terminal assignments, and protection logic must match the installed application.
The documented role is centered on numerical motor protection and low-load or load-loss trip functions. Exact electrical ratings, auxiliary supply values, communications interfaces, and configuration parameters should be checked against the installed relay nameplate and project documentation before ordering. There is no reliable public source establishing a universal voltage, current range, firmware version, or memory specification for every 029.148.924 unit, so those values should not be assumed from the part number alone. From a TCO perspective, retaining one verified replacement can avoid extended procurement cycles for a legacy protection component—especially where the alternative requires engineering review, panel modification, or a full protection-system redesign.
Migration, Compatibility & Field Traps
Replacement Matrix
| Replacement Type | Assessment |
|---|---|
| Drop-in Replacement | Potentially yes, subject to exact hardware and terminal verification |
| Software Compatible | Application and configuration dependent |
| Hardware Modification | Not normally assumed; verify mounting, terminals, and wiring first |
| Engineering Review | Required before energization |
Field Traps — Watch Out
- Protection Setting Mismatch: Do not transfer settings blindly. Verify low-load thresholds, trip delays, motor data, and protection curves against the existing commissioning record.
- Terminal and Auxiliary Supply Error: Confirm terminal numbering and auxiliary voltage from the actual unit before energizing. A visually similar legacy relay can still have a different electrical variant.
- Configuration Version Risk: Treat firmware and stored protection parameters as unit-specific until verified. Capture the existing configuration before replacement where the installed system permits it.
ALSTOM 029.148.924
Quality Assurance & Testing SOP
Each 029.148.924 unit should pass a documented incoming and pre-shipment inspection sequence:
- OEM Identification Check — Verify ALSTOM markings, part number, labels, serial information, and enclosure condition.
- Anti-Counterfeit Visual Inspection — Check label quality, connector condition, PCB workmanship, fasteners, seals, and evidence of unauthorized rework.
- Electrical Inspection — Check terminals, connectors, visible components, PCB contamination, corrosion, and signs of thermal damage.
- Power-On Functional Test — Apply the applicable test supply and verify normal startup behavior, indicators, and fault conditions.
- Protection Function Test — Exercise available relay protection functions relevant to the unit configuration, including low-load trip behavior where test access permits.
- Input and Output Verification — Validate applicable digital or analog I/O paths against the available test procedure and unit configuration.
- Configuration Review — Record displayed parameters, alarms, status information, and available diagnostic records.
- Final QC Record — Photograph the unit, label, serial data, test condition, and packing state before shipment.
Because public sources do not provide a complete OEM test specification for this exact part number, the final acceptance procedure should follow the installed system manual and the unit-specific engineering documents rather than a generic relay checklist.
Procurement-Driven FAQ
Is ALSTOM 029.148.924 genuinely available, and what is the cutoff for overnight shipping?
Availability should be checked against the physical inventory at the time of quotation. For urgent orders, provide the required quantity, ship-to location, and carrier cutoff so dispatch timing can be confirmed before payment.
How do you control the condition of an obsolete or surplus 029.148.924?
Each unit should be assessed individually. Inspection covers OEM identification, physical condition, terminals, PCB condition, power-up behavior, and applicable protection functions. Serial and label photographs can be supplied before shipment.
What warranty applies to defective units?
Warranty coverage should be stated on the quotation or proforma invoice for the specific unit supplied. Defect claims should normally include the order reference, serial number, failure description, and supporting test evidence.
Could firmware or configuration compatibility cause problems?
Yes. Firmware, stored settings, terminal variants, and application configuration can affect replacement acceptance. Engineering should compare the replacement against the installed unit before energization.
Is 029.148.924 a low-load trip relay or a motor protection relay?
Available industrial references use both descriptions. One identifies the exact part as a low-load trip relay, while another describes it as an advanced numerical motor protection relay. For procurement, the safest classification is a legacy numerical motor protection relay used for low-load trip protection, with final application verified from the actual installed documentation.
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