MVAJ103RA0804A ALSTOM

Model: MVAJ103RA0804A
Brand: ALSTOM (now GE Vernova)
Series: MVAJ 10
Core Function: Self-reset tripping relay with delayed burden cut-off
Type: High burden auxiliary trip relay
Key Specs: 10 contacts standard, 110-125 V DC operate, operate time <10 ms typical, 40-60 ms delayed cut-off

Key Technical Specifications

Operate voltage: 110-125 V DC (high burden standard)
Contact arrangement: 10 contacts (typically configurable; verify exact NO/NC per variant)
Reset method: Self-reset (automatic on coil de-energization)
Burden: High burden with cut-off feature (internal delay reduces to zero after 40-60 ms)
Operate time: <10 ms (high speed)
Contact rating: High capacity for multiple breaker trips (typically 10 A make/break at 110 V DC inductive; confirm OEM datasheet)
Drop-off delay: 40-60 ms on burden cut-off circuit
Operating temperature: -25 to +70 °C typical for MVAJ series
Mounting: Midos size 2 or equivalent drawout case
Insulation resistance: >10 MΩ at 500 V DC test
Contact bounce: Negligible

Product Introduction

In substation protection panels, the ALSTOM MVAJ103RA0804A steps in as the interface that multiplies trip signals from a single protection relay to several circuit breakers while adding security against wiring capacitance issues.

This self-reset version with high-burden delayed cut-off suits schemes needing fast trip initiation plus momentary high current draw for reliable operation over long cable runs. The 40-60 ms delay before burden drops to zero prevents coil overheating during sustained faults. Cross-check your scheme’s burden requirements and contact wiring against the panel diagram — variations exist across suffixes.