Description
ALSTOM MVAJ27L1FB0784D – Heavy‑Duty Trip/Auxiliary Relay for Protection and Control Panels
The ALSTOM MVAJ27L1FB0784D belongs to the well‑known MVAJ family of electromechanical tripping and auxiliary relays used in substation protection schemes, breaker control, and interlocking logic. From my experience, engineers choose the MVAJ series when they need fast, dependable operation and high contact capacity in harsh, electrical-noise environments where a simple, draw‑out relay just makes maintenance easier. You might notice that it slots neatly into legacy GEC/ALSTOM/AREVA/GE panels, making retrofit work a lot simpler than rewriting a whole scheme.
Company’s Order Placement Process and Guarantees
- Warranty period: 365 days
- Delivery time: 1 week for in-stock, no more than one month at the latest
- Payment method: 50% advance payment, full payment for delivery
- Express delivery methods: FedEx, UPS, DHL
Key Features
- Purpose‑built for protection trips – Suited to breaker trip/close circuits, lockout/alarm logic, and intertripping schemes in substations and switchgear line‑ups.
- Fast operate time – Electromechanical design with typically sub‑20 ms pickup helps ensure timely breaker operation when the protection issues a trip.
- High‑capacity contacts – Multiple changeover (Form C) contacts with robust making/breaking performance, in many cases rated around 10 A on resistive duty for 250 VAC / 30 VDC circuits.
- Draw‑out case – Withdrawable relay element for quick testing and swap‑out without disturbing panel wiring—one thing I appreciate for outage‑sensitive sites.
- Mechanical operation indicator – A front flag/indicator is commonly fitted so operators quickly see relay operation on site.
- Rugged build – Designed around protection‑grade standards (IEC 60255 family), with good immunity to shock, vibration, and transient disturbances typically found in MV/HV environments.
- Seamless retrofit – Compatible footprint and terminal philosophy with the ALSTOM/AREVA installed base, which often saves panel rework time.
Technical Specifications
| Brand / Model | ALSTOM MVAJ27L1FB0784D (MVAJ series trip/auxiliary relay) |
| HS Code | 8536.49 – Relays for a voltage exceeding 60 V |
| Power Requirements | Electromagnetic coil; commonly supplied in DC 110–125 V (build‑code dependent). Verify exact coil rating on the relay label before energizing. |
| Dimensions & Weight | Draw‑out protection relay case (ALSTOM/AREVA style size family); panel‑flush mounting depth typically around 150–170 mm with rear terminals. |
| Operating Temperature | −10 °C to +55 °C typical service range for MVAJ series relays |
| Signal I/O Types | Coil input; changeover (Form C) output contacts for trip/alarm circuits; front mechanical flag (where fitted) |
| Communication Interfaces | None (electromechanical relay; no serial/fieldbus ports) |
| Installation Method | Flush panel mounting in withdrawable case; rear screw/plug‑in terminals; suitable for rack panels with appropriate cut‑out |
Application Fields
- MV/HV substations – breaker trip/close circuits, intertripping, and scheme logic relay functions
- Power generation – turbine/generator protection auxiliaries and lockout/alarm indications
- Industrial power systems – process plant switchboards and motor control centers needing robust trip relays
- Utility retrofit projects – direct replacement in legacy ALSTOM/AREVA/GE panels without redesigning the wiring philosophy
A protection engineer at a regional utility told me they swapped an MVAJ unit into a 1980s panel and, because of the draw‑out case, test and commissioning took less than an hour—no rewiring required. That seems to be common when the installed base is ALSTOM lineage.
Advantages & Value
- Reliability – Proven electromechanical design with predictable trip behavior and visible operation.
- Compatibility – Matches common ALSTOM/AREVA case styles and terminal arrangements, which typically reduces engineering time.
- Cost & downtime savings – Draw‑out testing and quick field replacement help cut outage windows and commissioning cost.
- Technical support – Assistance with coil ratings, contact duty checks, and retrofit guidance for older panels.
Installation & Maintenance
- Panel/Cabinet – Mount in a clean, dry switchboard; allow front withdrawal space and rear cable bend radius. Maintain adequate ventilation to avoid heat soak.
- Wiring – Verify the rated coil voltage on the nameplate before energizing. Use appropriately rated wires for trip circuits; keep DC trip wiring away from high‑noise power cables where practical.
- Testing – Use the draw‑out feature to perform functional trip tests safely. Measure contact resistance periodically, especially on high‑duty circuits.
- Safety – Isolate trip/close supplies and discharge capacitors before withdrawing the relay. Confirm CT/VT secondary handling per site procedures.
- Routine care – Inspect terminals for tightness, clean dust from the case/flag, and replace worn contact blocks if duty is heavy. No firmware updates are required for this electromechanical design.
Supporting components we often supply alongside MVAJ relays include panel test plugs for the ALSTOM/AREVA draw‑out case, terminal shrouds, and trip circuit supervision relays—useful if you’re refreshing a bay in stages.
Quality & Certifications
- Designed to meet IEC 60255 protection relay standards
- CE marking typically applicable for the product family
- RoHS applicability may vary by manufacturing batch; many later units align with EU directives
- Manufacturer’s quality system aligned with ISO practices for grid products
- Supplied with a 365‑day warranty
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