Product: Alstom MVAJ104RB0802A MVAJ‑Midos Latching Tripping Relay

• Draw‑out plug‑in latching tripping relay, part number MVAJ104RB0802A, Alstom‑Areva MVAJ‑Midos product family
• Latching operation: stays actuated after trip pulse, holds fault status, supports manual local reset and electrical remote reset
• Fast operate performance, typical operate time of 10‑15 ms with minimal contact bounce
• Configurable high‑burden / low‑burden jumper setting, resists false operation caused by stray capacitance of long control cables
• Multiple mixed NO/NC contact outputs for circuit‑breaker tripping, fault‑alarm signalling and protection‑interlock logic
• Midos size‑4 draw‑out housing; transparent front cover for visual inspection of mechanical fault‑flag status
• DC operating coil equipped with economizer circuit to cut power consumption after latching
• Operating temperature range:‑10 °C ~ +55 °C for indoor substation cabinet‑only installation
• Mainly deployed in utility substation bays, power‑plant generator and transformer protection cubicles
• Critical legacy spare for existing protection‑panel maintenance, spare‑part replacement and protection‑system overhaul
• Full‑part‑number matching is mandatory; self‑reset MVAJ variants cannot substitute due to different latching‑logic behaviour
• High‑voltage safety procedures required during replacement work
• Burden‑mode setting and complete latch‑reset simulation test must be finished post‑installation