- Model: MVAX31S1DE0754A
- Brand: Alstom (GE Grid Solutions / AREVA lineage)
- Series: MVAX Trip Circuit Supervision Relays
- Core Function: Continuous supervision of breaker trip circuit integrity
- Type: Trip circuit supervision relay (pre- and post-closing, 3-unit design)
- Key Specs: 3 supervision units (RL1/RL2/RL3), delayed drop-off ~400 ms, contacts 3 pairs electrically separate, low continuous burden
Alstom MVAX31S1DE0754A is a trip circuit supervision relay that monitors breaker trip circuits continuously—detecting open circuits, supply failures, or mechanism issues whether the breaker is closed or open. It uses three internal units for full coverage: one for alarm output, one for closed-state supervision, and one for open-state via auxiliary switch.
This gives better coverage than MVAX21 (closed-only supervision). The 400 ms delay prevents nuisance alarms during normal trips or voltage dips from faults elsewhere. Alarm initiates on drop-off of supervision units, with flag indication for visual check. Discontinued model—GE Grid suggests equivalents like MiCOM series for new installs; confirm exact voltage, wiring, and resistor values per application diagram before use.
- Detects trip supply loss, open coil/wiring, or stuck mechanism in both breaker states
- Test report provided: serial/label verify, visual no aging/corrosion, power-up supervision check (healthy/open/simulated fault), alarm contact operation, 24-hour monitoring on rack simulator with photos of setup and continuity
- Continuous supervision sets it apart from MVAX21—critical for schemes needing pre-close integrity check
- Not recommended for simple supply-only monitoring—use MVAX12 instead to avoid extra complexity
- Contacts rated 10,000 loaded operations minimum per GE Grid specs
- Insulation >10 MΩ at 500 V megger; full functional test includes breaker state simulation and delay verification
Frequently Asked Questions
What does the S1DE0754A suffix mean on MVAX31? S1 likely indicates size 3 case variant; DE0754A points to 110/125 V DC rating and specific contact/wiring config. Check nameplate voltage range (87.5–137.5 V typical). Photo of label helps confirm exact operative limits against datasheet.
Can I swap this directly into an existing MVAX31 setup? Usually yes—same series, case size, function. Photograph existing wiring, auxiliary switch connections, and external resistors first. Field replacements often plug-compatible if voltage matches; verify supervision current through trip coil in both breaker positions before commissioning.
How does pre-closing supervision work on MVAX31S1DE0754A? Unit RL3 energizes via normally closed breaker auxiliary when open, holding RL1 via contact RL3-1. Detects faults like open wiring or low supply pre-close. If breaker closes, RL3 de-energizes but RL2 takes over. Total delay ~400 ms on drop-off—prevents false alarm on momentary shorts during trip.
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