ALSTOM MVAX91W1DD0754A

Brief Introduction: Part of ALSTOM’s MVAX (now GE Grid Solutions MiCOM auxiliary/numerical relay line), the MVAX91 is typically a trip-circuit supervision relay or a multifunction numerical protection relay used to monitor the integrity of the circuit-breaker trip circuit and provide auxiliary protection functions in HV/MV substations.

Category: ALSTOM

Description

Technical Specifications (Typical for MVAX91 Family):
- Function: Trip circuit healthy monitoring (open-circuit / close-circuit supervision) + optional auxiliary protection (undervoltage, overcurrent, etc. depending on firmware)
- Rated Aux. Voltage (Vdc): Commonly 24–250 V DC (verify on nameplate – DD0754A encodes specific voltage & option)
- Inputs: Trip coil (+) and (–) sensing; alarm supply input
- Outputs: Alarm relay contacts (NO/NC) for trip-circuit failure annunciation
- Communication (if equipped): RS-485 with Modbus / IEC 60870-5-103(depends on option)
- Operating Temp.: –20 °C to +70 °C
- Ingress Protection: IP54 (front face), IP30 (rear)
- Mounting: Flush (panel) or 35 mm DIN rail (case dependent)
- Standards: IEC 60255, IEC 61000 EMC
Features: Continuous supervision of both trip-close and trip-open circuits; LED indication of healthy/alarm state; configurable alarm delays; non-volatile event recording.
Applications: High/medium voltage switchgear panels, GIS substations — to detect blown trip-coil fuses or open wiring before a fault occurs.
Installation Notes: Wire trip + and – sense leads correctly per wiring diagram; set alarm delay to avoid nuisance during breaker operation; test periodically using built-in test pushbutton.

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