Description
ALSTOM MVAJ101RB0800A
Technical Specifications
- Product type: Power protection auxiliary relay module
- Supply voltage: DC110V / DC220V
- Contact rating: 250V AC, 5A
- Number of contacts: Multi NO / NC relay contacts
- Operating time: Less than 10ms
- Operating temperature: -20 °C to +60 °C
- Storage temperature: -40 °C to +85 °C
- Humidity: 5% to 95%, non-condensing
- Protection grade: IP20
- Mounting: DIN rail or panel mounting
- Coil power consumption: Low power consumption coil
Functional Features
- Receive trip command from main protection relay
- High speed relay contact output for breaker trip circuit
- Signal latching function to keep trip state
- Multi-channel auxiliary contact expansion
- Anti-bounce circuit design
- LED status indicator for coil energized state
- Surge suppression for coil circuit
- Industrial anti-electromagnetic interference capability
- Suitable for DC substation control circuit
- Long mechanical life for frequent operation
Application Scenarios
- High voltage substation protection panel
- Generator protection auxiliary trip circuit
- Transformer protection signal output expansion
- Switchgear control cabinet trip latching circuit
- Power plant auxiliary equipment protection system
Materials and Construction
- Housing: Flame retardant plastic or metal housing
- PCB: FR4 circuit board
- Relay: Electromagnetic power relay
- Terminals: Screw copper terminals
- Surge component: Varistor for coil surge suppression
- LED: Status indicator
Structural Features
- Rectangular module housing
- Front panel LED indicator
- Top and bottom screw terminal blocks
- Internal relay coil and contact assembly
- Internal surge suppression circuit
- DIN rail clip at rear side
Working Principle When protection trip command energizes relay coil, the electromagnetic relay actuates instantly. Relay contacts change state and send power signal to circuit breaker trip coil. Latching circuit keeps contact state even input command disappears. Surge suppression components absorb reverse electromotive force generated by coil de-energization to protect control circuit.
Installation Requirements
- Mount on DIN rail inside substation protection cabinet
- Wire trip circuit with adequate cross-section cable
- Confirm DC supply voltage matches coil rating
- Ambient temperature kept -20 °C to +60 °C
- Cabinet grounding connection
- Test relay pickup and dropout after wiring
- Separate weak signal wiring and high power trip wiring
Precautions
- Do not exceed rated contact load
- Check contact burnout during regular maintenance
- Prevent coil overvoltage
- Avoid strong electromagnetic field interference nearby
- Store spare module in dry environment
- Do not disassemble relay internal components
