ALSTOM MVAJ105RA0802A High-speed Trip Control Relay

ALSTOM MVAJ105RA0802A High-Speed Trip Control Relay Detailed Explanation
I. Brand Evolution
This product was originally developed by Alstom. The transmission business segment was successively merged into Areva and GE Grid Solutions (now GE Vernova). It is a classic multi-contact main control trip relay for power protection cabinets, mainly used in substations and generator set interlock protection circuits.
Model Segmentation Interpretation
MVAJ10: Product series, standard configuration of 10 contacts; the last 5 represents the dual mode of manual mechanical reset + remote electrical reset, with an action indicator flag;
RA0802A: Suffix for coil rated voltage, contact configuration, and housing specification customization. Replacement during ordering must fully follow the complete numbering.

Core Technical Parameters Table
Parameter Categories Detailed Specifications
Action Performance Operation time under rated voltage is less than 8ms, reset time is less than 15ms, contact jitter is minimal, suitable for emergency trip scenarios
Contact Configuration 10 customizable normally open / normally closed switching contacts, supports switching between high and low load levels
Contact Capacity Short-term switching: AC 7500VA / DC 7500W (maximum 30A/300V, continuous 3s); Long-term carrying capacity: AC / DC 1250VA/W (maximum 5A/300V)
Coil Power Supply This model is compatible with the mainstream trip voltage of DC110V in industrial power distribution
Insulation Voltage Resistance Power frequency withstand voltage 2kV (1 minute), strong anti-interference ability
Operating Environment -10℃~+55℃, suitable for closed cabinet conditions in power distribution rooms
Installation Method Vertical modular cabinet embedded installation

Core Functional Features
Dual Reset Flexible Design
On-site manual reset by button, remote reset by electrical signal from a distance, the flag can directly record the trip action, suitable for unmanned substations’ operation requirements.
Dual Load Adaptation Scheme
Low load level is used for short-line signal conversion inside the cabinet; high load level is suitable for long-distance cable wiring, capacitive discharge scenarios, avoiding false actions caused by parasitic parameters in the line.
Energy-saving Maintenance Circuit
After the coil is attracted, it automatically reduces the holding power consumption, resulting in lower heat generation and longer lifespan during long-term operation.
Multi-Loop Parallel Output
10 groups of contacts can simultaneously drive circuit breaker tripping, audible and visual alarms, DCS signal upload, interlock locking multiple circuits, simplifying cabinet wiring.

Typical Application Scenarios
Power plant turbine TSI unit protection linkage trip (can be used in combination with the previously queried Ingersoll Rand 3500 series monitoring module);
High-voltage switch cabinet line, transformer integrated protection system main control trip unit;
Petrochemical and metallurgical power distribution system fault emergency tripping, process interlock cut-off control;
Power grid substation complete protection screen multi-channel signal relay execution.