- Model: MVAJ105RA0804A
- Brand: Alstom (now GE Grid Solutions)
- Series: MVAJ 05/10/20 Tripping & Control Relays
- Core Function: Latched tripping with hand and electrical reset for protection lockout
- Type: Auxiliary tripping relay (hand/electrical reset, flag indicator)
- Key Specs: 10 contacts (typically 6NO + 4NC), high/low burden configurable, operate time <10 ms typical, reset via hand push or electrical coil
Alstom MVAJ105RA0804A serves as a hand- and electrical-reset tripping relay in the MVAJ series, commonly installed in substation protection panels to latch on trip initiation and hold until manually or electrically cleared. It drives breaker trip coils directly while providing extra contacts for alarms, interlocks, or multiple breaker control.
This model suits lockout or maintained-trip applications where reset must be deliberate—unlike self-reset types like MVAJ101. High-burden mode supports long cable runs or capacitor discharge tripping; low-burden cuts holding power to near zero after operation in some configs. Contacts show negligible bounce, and the flag gives clear visual indication of latched state. Confirm voltage and link position (terminals 22-24 for burden) on arrival—GE Grid Solutions brochure lists ESI 48-4 compliance for burden classes.
- Withstands high capacitance discharge (10 µF @ rated voltage typical in high-burden) without false trips on surge
- Test report included: visual inspection, serial verification, coil energize/reset cycle, contact continuity mapping, 24-hour latched hold on test rack
- Provides more reset flexibility than self-reset alternatives—electrical reset allows remote clearing without panel access in control schemes
- Not recommended for auto-reclose schemes—use self-reset MVAJ101 or delayed MVAJ102 instead
- Contacts handle 10,000 loaded operations minimum per GE reference specs
- Insulation checked >10 MΩ at 500 V; full functional test on MVAJ-compatible simulator rack with photo evidence of setup and results
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