ALSTOM MVAJ101RB0800A

Product Name: MVAJ Series Auxiliary Tripping & Control Relay (Hinged Armature Type)

Brief Introduction: A heavy-duty auxiliary relay from the ALSTOM (now GE Grid Solutions) MVAJ family, used as a tripping relay, seal-in relay, or control interface between protective relays and circuit-breaker trip coils. The MVAJ101 variant is a single trip/control relay in a compact case.

Category: ALSTOM

Description

Technical Specifications:
- Type: Electromechanical hinged-armature relay with hand-reset flag (A = standard hand-reset flag)
- Coil Voltage Options (by suffix): 24/48/110/125 V DC or 110/220 V AC (check nameplate – RB0800A indicates specific coil & contact config)
- Operate Time: ≤ 10 ms (trip relay version); ≤ 15 ms (control version)
- Contact Configuration: Typically 2–5 changeover (Form C) contacts; high-breaking-capacity contacts for trip-coil switching
- Contact Rating: Up to 30 A (make/break at rated coil voltage for trip duty); 5 A continuous typical
- Case Size: Midos Size 2 (5/10 contacts)
- Reset: Hand-reset flag (manual); some variants offer electrical or self-reset
- Ambient Temp.: –10 °C to +55 °C
- Mounting: Panel or rack mount (Midos standard)
Features: Negligible contact bounce; immune to stray capacitance discharge; high contact capacity eliminates need for intermediate contactors in many trip circuits; visual flag indication.
Applications: Breaker trip circuit supervision, lockout relays (86 device), interposing relays in substation protection & control schemes, generator/motor protection tripping.
Installation Notes: Verify coil voltage matches DC supply before energizing; ensure flag resets manually after operation; maintain adequate clearance for arc suppression on trip-contact wiring.

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