ALSTOM MVAJ105RA0802A Protection Relay Module

Technical Specifications

The ALSTOM MVAJ105RA0802A is a high-specification hinged armature relay engineered specifically for rapid tripping and protection duties within electrical power systems. As a critical interface between primary protective sensors and circuit breakers, this module ensures that fault signals translate into immediate physical isolation of equipment. Because it features a high-burden design, the relay provides exceptional immunity to accidental operation caused by capacitance discharge in long DC wiring runs, which significantly enhances the security of the protection scheme.

Key Technical Characteristics

• Ultra-Fast Response Time: The armature mechanism achieves contact closure in less than 10ms, which is essential for maintaining system stability and preventing catastrophic thermal damage during short-circuit events.
• Minimal Contact Bounce: Advanced mechanical engineering ensures that once the contacts meet, they remain closed without the intermittent “bouncing” that can cause electrical noise or premature wear on secondary equipment.
• Direct Drive Capability: The heavy-duty contact rating enables the module to switch the high inductive loads associated with breaker trip coils without failure.
• Versatile Integration: While primarily used for tripping, the auxiliary contacts on the MVAJ platform support complex interlocking, remote signaling, and multi-zone protection coordination.
• Operational Reliability: The unit is designed to function accurately under harsh substation conditions, including environments with high electromagnetic interference and fluctuating ambient temperatures.