ALSTOM MVAJ105RA0802A High‑Speed Trip Relay
ALSTOM MVAJ105RA0802A is a hinged‑armature high‑speed trip relay for power system protection, now part of GE Grid Solutions product portfolio. It serves as the interface between primary protection devices and circuit‑breaker trip coils, delivering fast‑acting trip signals to isolate fault sections in substations and power‑plant electrical systems.
This relay supports both manual hand reset and electrical reset modes, with configurable high/low burden settings via internal links. It features ultra‑fast operate time and stable contact performance, widely used as replacement spare‑part for on‑site troubleshooting, substation‑protection‑system maintenance and retrofit projects.
Main Specifications
Brand: ALSTOM (GE Grid Solutions)
Model: MVAJ105RA0802A
Product Type: Hinged‑armature high‑speed trip protection relay
Operating Time: Less than 10 ms typical
Reset Mode: Hand reset / electrical dual‑reset (RA series)
Burden Setting: High / low burden selectable by internal link
Operating Temperature:‑10℃ ~ +55℃
Mounting: Standard sub‑rack plug‑in installation
Contact Function: Direct drive for circuit‑breaker trip coil
Application: Spare‑part replacement for power‑substation & plant‑protection‑system equipment
Core Functions
Receive trip command signal from primary protection relays and drive circuit‑breaker trip coils directly
Ultra‑fast response ensures rapid fault isolation for high‑voltage power‑network protection loops
Dual hand‑electrical reset design supports on‑site manual reset and remote electrical reset operation
Configurable burden adapts to different trip‑coil load requirements, restraining false‑trip risk
Hinged‑armature mechanical structure provides high reliability under substation harsh electromagnetic‑interference environment
Visual status indicator shows relay actuation state for convenient on‑site inspection and fault diagnosis
Plug‑in rack‑mount structure simplifies installation, wiring check and spare‑part replacement operation
Application Scenarios
High‑voltage substation protection cabinet trip‑loop configuration projects
Thermal‑power‑plant generator and switch‑gear protection‑control supporting projects
On‑site trip‑relay fault replacement and power‑protection‑system daily maintenance work
Legacy substation‑protection‑system renovation for upgrading high‑speed trip‑output reliability
Legacy ALSTOM / AREVA MVAJ‑series protection‑relay spare‑parts replacement scenarios
Spare‑parts inventory backup for power‑plant and substation protection‑control‑room cabinets
Power‑system protection‑trip‑hardware repair supporting engineering projects
