MVAX31S1DD0754A Alstom Trip Circuit Supervision Relay

MVAX31S1DD0754A is an electromechanical trip circuit supervision relay manufactured by Alstom, widely adopted within power substation protection and control systems. This three-unit supervision relay continuously monitors the integrity of circuit breaker trip circuits, capable of detecting open wiring, trip coil faults and loss of control supply whether the circuit breaker is open or closed. It provides reliable fault alarming for trip circuit failures, preventing hidden defects that could result in failure to trip during electrical faults.

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Description

MVAX31S1DD0754A Alstom Product Introduction & Technical Specifications
Brand: Alstom (GE Grid Solutions legacy)
Model: MVAX31S1DD0754A
Product Name: Trip Circuit Supervision Relay
Series: MVAX Protection Relay Series

MVAX31S1DD0754A

MVAX31S1DD0754A

Technical Specifications
Dimensions: Approximately 144 mm × 80 mm × 115 mm
Weight: Around 0.65 kg
Country of Origin: United Kingdom
HS Code: 85364900
Nominal operating voltage: 110/125 VDC
Drop-off delay time: Around 400 ms
Contact configuration: Three sets of electrically independent output contacts
Operating ambient temperature: -10°C ~ +55°C
Storage temperature: -40°C ~ +70°C

MVAX31S1DD0754A

MVAX31S1DD0754A

Relative humidity: 5% ~ 95%, non-condensing
Mounting method: Standard plug-in size 3 case for protection panel installation
Low continuous power burden to minimize load on DC control supply
Key Characteristics
Robust attracted-armature electromechanical construction with stable operation and contact anti-chatter design.
Full supervision coverage for trip circuits under both breaker open and closed status, superior to single-state supervision relays.
Built-in time delay function eliminates nuisance alarms caused by short-duration voltage transients.
Independent contact groups enable flexible wiring schemes for alarm indication and interlock logic.
Plug-in modular structure allows quick on-site replacement without extensive rewiring during maintenance.
Excellent electromagnetic compatibility, suitable for harsh substation environments with heavy electromagnetic interference.
High mechanical and electrical contact endurance for long-term continuous operation.
Proven legacy protection component, interchangeable with matching MVAX31 series variants for power system retrofit projects.
Original industrial spare part for Alstom / GE Grid power protection and switchgear control systems.

MVAX31S1DD0754A

MVAX31S1DD0754A

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