Product Overview

• Part No: MVAJ27L1FB0784D
• Brand: ALSTOM

• Category: Latching Trip RelayMVAJ27L1FB0784D belongs to ALSTOM classic MVAJ series high-speed latching trip relay. It receives protection trip signals and drives multiple sets of heavy-duty contacts for circuit breaker tripping, alarm and interlock circuits. This model adopts mechanical latching design; after operation, contacts maintain state until manual or electrical reset, preventing accidental reset during transient faults. Equipped with transparent protective cover and standard plug-in housing, it is a common spare component for secondary protection cabinets in power plants and high-voltage substations.

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Core Features

• High-speed action, short operate time for reliable breaker tripping
• Mechanical latching function, manual/electrical reset available
• Multi-pole changeover contacts, suitable for multi-loop signal distribution
• High burden design, anti-maloperation caused by cable distributed capacitance
• Transparent front cover for status observation and inspection
• Standard plug-in modular structure for fast field replacement

• Passed EMC, vibration and thermal cycling reliability testing

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Technical Specifications

• Auxiliary Supply: 110V/220V DC
• Operating Frequency: 50/60Hz
• Operating Temperature: -20°C ~ +60°C
• Storage Temperature: -40°C ~ +85°C
• Installation: Chassis plug-in mounting

• Front Protection Class: IP40

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Compatibility & Application

• Matches ALSTOM legacy secondary protection cabinet system
• Widely used in thermal power plants, captive power stations and distribution substations
• Applied for protection trip signal amplification, breaker control circuit, fault alarm and equipment interlock