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Help CenterALSTOM MVAJ21L1GB0771B – Heavy‑Duty Auxiliary/Tripping Relay for Protection Panels
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Warranty: 365 days
Delivery: typically 1 week if in stock; no more than 1 month latest
Payment: 50% advance payment; full payment prior to delivery
Express delivery options: FedEx, UPS, DHL
Instantaneous tripping action – attracted‑armature design delivers fast operate time for dependable breaker trip commands.
Heavy‑duty contacts – typically used to drive trip coils or interlocks; suited for DC duty with solid make/break performance.
Hand‑reset flag/indicator – operators can visually confirm operations; helpful during commissioning and post‑fault checks.
Multiple coil voltage options – the series is available in common DC coils (e.g., 24/48/110/125/220 VDC); this build code is commonly paired with a 110 VDC coil in many cases.
Draw‑out case for maintenance – relay element can be withdrawn for inspection or replacement without re‑wiring the panel.
Noise‑tolerant and simple to test – straightforward design that works well with standard secondary‑injection and functional test routines.
Retrofit‑friendly – widely used in legacy ALSTOM/AREVA/GEC panels, which helps reduce re‑engineering effort during like‑for‑like replacement.
| Brand / Model | ALSTOM MVAJ21L1GB0771B |
| HS Code | 8536.49 (Relays, for a voltage not exceeding 1,000 V, other) |
| Power Requirements (Coil) | DC coil; model‑dependent. For this code, it commonly corresponds to 110 VDC in many installations; please confirm against rating plate. |
| Signal I/O Types | Dry relay outputs; changeover contacts (Form C). Contact arrangement per sub‑code; suited for trip/interlock duty. |
| Communication Interfaces | None (electromechanical auxiliary relay) |
| Operating Temperature | Typically −10°C to +55°C for this series (verify with nameplate) |
| Installation Method | Flush panel mounting in draw‑out case; rear terminal block wiring |
| Dimensions & Weight | Varies by contact/flag configuration; typical draw‑out relay case used in protection panels. Detailed case size available on request. |
This model is widely used in medium‑ and high‑voltage environments where a rugged tripping or interlocking element is required:
Utility substations and MV/HV switchgear (breaker trip and lockout functions)
Industrial protection panels for motors, feeders, and transformers
Generator protection cabinets in power plants
Rail traction and transportation substations
Oil, gas, and petrochemical MCC/relay rooms with DC trip circuits
Reliability that operators trust – simple mechanism, fast operation, and a long track record in critical protection schemes.
Compatibility with existing panels – in many cases a like‑for‑like replacement minimizes wiring changes and downtime.
Cost control – avoids re‑engineering trip circuits when retrofitting numerical relays; keeps commissioning time tight.
Serviceability – draw‑out design and hand‑reset flag simplify fault tracing and periodic testing.
Support and spares – we can supply coil voltage variants and contact configurations matched to your scheme drawings.
Panel and environment – mount in a clean, dry, and ventilated protection panel; typical 19‑inch rack or switchgear relay compartment is fine.
Wiring – use appropriately rated DC supply wiring; observe coil polarity if indicated; keep trip circuits segregated from noisy control wiring.
Contact load – size arc suppression for DC inductive loads where needed (RC snubbers or diodes) to extend contact life.
Grounding – ensure panel ground is sound to reduce nuisance operations due to transient spikes.
Routine checks – quarterly mechanical operate/return tests; annual contact resistance check and visual inspection for dust/carbonization.
Cleaning – power down, withdraw the relay, and use non‑residue contact cleaner; avoid over‑lubrication.
Documentation – verify coil voltage and contact arrangement against the nameplate and your protection scheme prints before energization.
Manufacturer quality system: typically ISO 9001 for ALSTOM protection manufacturing
Compliance: CE marking for low‑voltage switchgear components; RoHS applicability varies by production batch and year
Warranty: 365 days (repair/replace)
One thing I appreciate is how predictable the operate/reset behavior is with the MVAJ series, especially on DC trip circuits with long runs. A maintenance supervisor at a steel plant told us the hand‑reset flag “saved a few hours” during an unexpected breaker trip because the team could identify the initiating device within minutes. If you’re standardizing spares, it seems to be a good idea to keep at least one coil‑voltage variant aligned with your most common DC bus (often 110 or 125 VDC).
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