Description
1. Unboxing & Physical Snapshot
- Model & Brand: Alstom / Areva / GE Grid Solutions (Midos System Series) — MVAJ051RB0800B (Self-Reset High-Speed Tripping Relay)
- Physical Dimensions: Standard Midos Size 2 modular draw-out case measuring approx. 177 mm high x 51 mm wide x 212 mm deep.
- Estimated Shipping Weight: 1.4 kg (3.08 lbs) packed inside industrial anti-static cushioning, moisture-barrier wrapping, and reinforced double-wall corrugated cartons.
- What’s in the Box: MVAJ051 relay module assembly in draw-out case, plug-in terminal blocks, factory test data slip, and safety/commissioning guide insert.
2. Product Introduction
Providing a reliable, high-speed electrical link between protective measurement relays and circuit breaker trip coils is vital for preventing catastrophic fault propagation in power transmission grids. Operating as part of the field-proven Midos protection and control architecture, the MVAJ051RB0800B is a high-speed, self-resetting auxiliary tripping relay equipped with 5 output contacts.
Engineered with a hinged armature mechanism, negligible contact bounce, and options for high or low burden configurations, the unit interfaces protection signals cleanly to multiple breaker coils while providing strong immunity against unwanted capacitance discharge currents. Substation automation engineers, protection technologists, and utility maintenance crews rely on this exact hardware configuration to ensure fast, secure tripping actions across high-voltage switchgear environments.
3. Core Technical Specifications
| Parameter | Value |
| Product Series | Alstom / GE Midos MVAJ 05 / 10 / 20 Tripping Relay Series |
| Model Designation | MVAJ051RB0800B (Self-Reset Variant) |
| Contact Arrangement | 5 output contacts (Self-reset configuration) |
| Enclosure Type | Midos Size 2 modular draw-out case format |
| Operation Time | High-speed operation under 10 ms (nominal supply voltage) |
| Burden Selection | High or low burden selectable via external case terminal links |
| Operating Temperature | -10^\circC to +55^\circC (14^\circF to 131^\circF) |
| Storage Temperature | -25^\circC to +70^\circC (-13^\circF to +158^\circF) |
| Dielectric Strength | 5 kV peak, 1.2/50 \mus test compliance per IEC 60255-5 |
4. Global Compliance & Industry Certifications
Substation auxiliary hardware must satisfy strict electrical safety standards to endure heavy inductive switching transients and harsh utility environments.
- Certifications: CE Mark, type-tested to IEC 60255 international protection relay standards, and ISO 9001 manufacturing quality compliance.
- Safety Relevance: The high dielectric isolation and surge-proof internal suppression prevent battery ground-fault leakage currents or DC control transients from triggering false breaker operations.
- Audit Note: Keep factory routine test records, insulation resistance test logs, and auxiliary voltage verification records accessible for internal utility compliance and NERC/regional grid audits.
5. Long-Term Storage & Asset Preservation Guide
Auxiliary electromechanical relays kept in warehouse inventories require careful climate isolation to prevent spring fatigue, contact oxidation, and dust infiltration. Preserve your asset by executing these procedures:
- Maintain indoor climate-controlled storage where ambient temperatures stay between -15^\circC and +40^\circC with relative humidity strictly below 80% non-condensing.
- Keep the module sealed inside its original manufacturer box and anti-static bag until the exact switchgear integration window.
- Avoid mechanical shocks or heavy stacking on top of storage cartons to protect the sensitive internal hinged armature and gold-flashed contact blades.
6. Physical Installation Prerequisites
Proper draw-out module alignment, terminal torque checking, and auxiliary power verification are mandatory prior to panel energization.
- Clearance Space: Ensure horizontal and vertical room inside the switchgear compartment for smooth extraction and insertion of the Midos draw-out chassis.
- Wiring Termination: Use properly sized insulated crimp terminals on all rear case block connections to maintain finger-safe IP20 protection ratings.
- Isolation Precautions: Isolate both poles of the DC auxiliary supply before withdrawing the relay core from its permanent casing block to prevent contact arcing.
7. Buyer’s FAQ (Logistics & Compliance Focus)
Q: What Harmonized System (HS) Tariff Code applies to this Alstom/GE tripping relay for international shipments?
A: Industrial control relays, protective switching devices, and auxiliary electrical apparatus typically classify under HS code 8536.49.0030 (Relays: For a voltage exceeding 60 V but not exceeding 1,000 V). Always verify final classifications with your customs broker.
Q: What does the “051” designation indicate in the MVAJ product naming convention?
A: It designates the compact Midos Size 2 frame housing a self-resetting operating mechanism with 5 isolated output contacts.
Q: What is the Country of Origin (COO) for trade compliance record-keeping?
A: Alstom and GE Grid Solutions auxiliary relays are primarily manufactured in designated European production facilities (such as the United Kingdom or France), requiring accurate origin tracking on commercial invoices.
Q: Is specialized shock-resistant transit insurance required for international cargo delivery?
A: Yes, because electromechanical hinged armature blocks contain precision-calibrated spring balances and delicate mechanical pivots, full-value freight insurance is strongly recommended.
