• Model: MVAJ205TA0802A
• Brand: ALSTOM (now GE Vernova)
• Series: MVAJ 20
• Core Function: High-capacity tripping relay for multiple breaker operation
• Type: Self-reset auxiliary trip relay (high burden standard)
• Key Specs: 20 contacts, Midos size 4 case, operate time <10 ms typical, high burden with delayed cut-off

Key Technical Specifications

• Operate voltage: Typically 110-125 V DC (high burden; confirm nameplate for exact rating – some variants 220/250 V)
• Contact arrangement: 20 contacts (configurable NO/NC combinations for tripping + signaling; verify exact build)
• Reset method: Self-reset (automatic on coil de-energization)
• Burden: High burden standard (delayed cut-off to ~100 W for 40-60 ms, then to zero or economized)
• Operate time: <10 ms at rated voltage
• Contact rating: High make/break capacity (typically 10 A inductive at 110 V DC; make 7500 VA/W for 3 s, continuous 1250 VA/W; confirm datasheet for exact)
• Drop-off/burden delay: 40-60 ms before cut-off in high burden mode
• Operating temperature: -25 to +70 °C typical for MVAJ series
• Mounting: Midos size 4 drawout case
• Insulation resistance: >10 MΩ at 500 V DC
• Contact bounce: Negligible

Product Introduction

The ALSTOM MVAJ205TA0802A handles heavy-duty tripping in large substation panels where one protection output must drive many circuit breakers simultaneously.

With 20 contacts in a size 4 case, it multiplies trip signals while the high-burden delayed cut-off (40-60 ms at ~100 W) provides capacitance discharge immunity over extended wiring without sustained high consumption. This suits busbar, transformer, or generator protection needing wide distribution. Always match voltage rating and contact wiring to your scheme – size 4 cases demand panel space checks.

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