The Areva MVAA11R1BA0781C is a high-reliability, low-burden auxiliary relay designed for general-purpose applications in protection and control schemes. As part of the M-Series, it is engineered for long-term service in substation environments where minimal power consumption and robust performance are essential.
Product Parameters (Datasheet)
- Model Series: MVAA
- Full Part Number: MVAA11R1BA0781C
- Rated Voltage (Vx): 110-125V DC
- Relay Type: Low Burden Auxiliary Relay
- Configuration: Single element
- Contact Arrangement: Typically 4 contacts (Configurable as N/O, N/C, or Changeover based on specific model sub-code)
- Reset Type: Self-Reset (The relay returns to its original state when the coil is de-energized)
- Operating Time: Fast-acting (Typically < 15ms-25ms)
- Burden: Low (Designed to draw minimal current from the station battery)
- Enclosure: Size 1/2N or Size 2 modular draw-out case
- Compliance: IEC 60255 compliant for electrical protective relays
Country of Origin
This relay was originally designed and manufactured by Areva T&D (now part of the GE Grid Solutions legacy) in the United Kingdom or France.
Application Fields
The MVAA series is used extensively across power generation and distribution for:
- Signal Multiplication: Taking a single input from a protection relay and expanding it to multiple output signals for SCADA, alarms, and interlocks.
- Control Logic: Managing permissive and lockout sequences in high-voltage switchyards.
- Isolation: Providing galvanic isolation between different voltage levels or separate control circuits.
- Status Monitoring: Indicating the position of circuit breakers, isolators, and earth switches to the central control room.
- Interposing Duty: Acting as a bridge between sensitive electronic controllers and higher-power switching devices.
Product Usage Instructions
- Installation: Slide the MVAA11 module into its corresponding M-Series case. Ensure the module is pushed fully home so the rear connectors engage securely.
- Wiring: Connect the 110-125V DC supply to the coil terminals. Ensure all wiring is rated for the substation environment and properly labeled.
- Polarity: While many auxiliary relays are non-polarized, it is best practice to follow the wiring diagram on the side of the relay to ensure consistent operation.
- Testing: Verify the pick-up and drop-out voltage levels. A healthy 110V DC relay should typically pick up at or below 80V DC.
- Maintenance: The draw-out design allows for easy removal for routine testing. Ensure the case cover is replaced to prevent dust ingress.
Product Technical Description
The MVAA11R1BA0781C is categorized as a “Low Burden” relay. Technically, this means the coil is designed with high impedance, which significantly reduces the steady-state power consumption (Burden) on the station’s DC system. This is particularly important in large substations where dozens of relays may be energized simultaneously. The “Self-Reset” logic ensures that as soon as the initiating signal is removed, the contacts return to their shelf state, making it ideal for non-latching signaling and control loops.
Q&A (Common Questions)
Q: Does this relay have a visual flag indicator? A: Most MVAA models are “attracted armature” relays without flags. If you require a visual mechanical target, the MVAX series is the appropriate alternative.
Q: Can I use this for high-speed tripping of a circuit breaker? A: While the MVAA is fast, the MVAJ series is specifically designed for high-speed tripping with higher contact ratings for breaking inductive trip-coil currents.
Q: Is it okay to use this on an AC 110V circuit? A: No, the MVAA11R1BA0781C is designed for DC voltage. Using AC will cause the relay to chatter and may result in coil failure.
Q: What is the “C” at the end of the part number? A: The suffix often denotes the hardware revision or a specific protective coating for the internal components.
Similar Model Recommendations
- Areva MVAA13 (Three-element version)
- Areva MVAA11 (Non-low burden variant)
- Areva MVAJ101 (High-speed tripping relay)
- Areva MVAX12 (Auxiliary relay with flag indicator)
- GE/Alstom MiCOM P12x (Modern digital multifunction replacement)
For procurement or technical support regarding the Areva MVAA11R1BA0781C, please contact our industrial relay team.
