Product Description
Model: MVAJ205TA0802A Brand: ALSTOM (now GE Vernova) Product Name: High‑Burden Tripping Auxiliary Relay, MVAJ‑20 Series
MVAJ205TA0802A is a hinged‑armature tripping auxiliary relay dedicated for power‑system protection. It adopts draw‑out Midos Size‑4 case with 20 configurable contacts and self‑reset mechanism. Equipped with high‑burden delayed cut‑off function, it provides immunity against capacitive discharge from long control cables. It distributes one protection trip signal to multiple circuit‑breaker trip coils simultaneously. Original manufacturer end‑of‑life; mainly circulated as substation spare part. It is a pure hard‑contact electromechanical relay without communication interfaceGE Vernova.
Technical Specifications
| Item | Specifications |
|---|---|
| Model | MVAJ205TA0802A |
| Series | MVAJ‑20 |
| Case | Midos Size‑4, draw‑out type |
| Contacts | 20 configurable NO / NC contacts |
| Reset Mode | Self‑reset (auto‑reset upon coil de‑energization) |
| Operate Time | Typical ＜10 ms at rated voltage |
| Delayed Cut‑off | 40‑60 ms, high burden approx.100 W |
| Coil Voltage | 110‑125 VDC(refer to nameplate) |
| Contact Rating | High make‑break capacity for breaker trip coil circuits |
| Product Status | Obsolete OEM unit, used/refurbished spare parts available |
| Feature | Immunity to cable capacitive discharge, no communication function |
Product Application
- Substation protection panels: busbar protection, transformer protection, generator protection trip‑signal expansion.
- Distribute single protection trip signal to operate multiple circuit‑breakers in parallel; expand trip & alarm contacts.
- Prevent false holding caused by capacitive discharge of long control cables, widely used in HV/MV substation secondary circuits.
- Retrofit & spare‑part replacement for legacy power‑protection systems.
Main Series‑equivalent Part Numbers
- MVAJ203: Hand‑reset, 20 contacts
- MVAJ204: Electric‑reset, 20 contacts
- MVAJ205: Hand & Electric combined reset, 20 contacts (this model sub‑series)
- MVAJ101: Self‑reset, 10 contacts
- MVAJ103: Hand‑reset, 10 contacts
- MVAJ104: Electric‑reset, 10 contacts
- MVAJ105: Hand & Electric combined reset, 10 contacts
- MVAJ051: Self‑reset, 5 contacts
- MVAJ053: Hand‑reset, 5 contacts
- MVAJ054: Electric‑reset, 5 contacts
- MVAJ055: Hand & Electric combined reset, 5 contactsGE Vernova
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