The MVAJ104RB0802A is a model from the MVAJ series of tripping and control relays, originally manufactured by Alstom (now part of GE Grid Solutions). These relays are widely used in high-security circuit breaker tripping applications, especially in power system protection schemes.

 Key Features of MVAJ104RB0802A

• Relay Type: Electrical-reset trip relay
• Reset Mechanism: Can be reset remotely via electrical signal
• Burden Configuration: Supplied as high burden; can be converted to low burden by removing external links
• Operating Time: Typically within 10–15 milliseconds
• Contact Bounce: Negligible, ensuring reliable operation
• Flagging: Includes hand-reset flag for fault indication
• Delayed Cut-off: Available for high burden applications (40–60 ms delay)
• Immunity: High immunity to wiring capacitance discharge

 Applications

• Circuit breaker tripping in transformer protection schemes
• Auto-reclose systems
• Remote fault indication and reset
• Inter-tripping between HV and LV breakers

 Configuration Notes

• External links between terminals 21–23 and 22–24 allow customization:
  • Reset inhibition feature
  • Burden selection (high vs. low)
• Compatible with DC operation in high burden mode
• Can be used with supervision relays like MVAX11 for enhanced reliability