Product Overview

• Part No: MFAC14K1AA0001A
• Brand: ALSTOM

• Category: High Impedance Differential Protection RelayMFAC14K1AA0001A belongs to ALSTOM classic MFAC series, single-element high impedance differential relay dedicated for earth fault unit protection. It adopts high impedance differential principle, featuring strong stability for through faults and fast operation speed for internal faults. Users can adjust operating voltage threshold via front panel setting resistors. Equipped with transparent protective cover, plug-in modular housing, it is widely used as replacement spare in power plants and substations for busbar, generator, transformer winding earth fault protection.

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Core Features

• Single-element design for earth fault high impedance differential unit protection
• Excellent stability under external through fault conditions, high-speed trip on internal faults
• Front panel adjustable voltage setting range for flexible scheme matching
• Transparent cover for convenient parameter checking and local setting
• Standard plug-in modular construction, easy on-site replacement
• Built-in surge suppression, strong anti-interference performance for substation environment

• Passed EMC, vibration and thermal cycling reliability long-term operation testing

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Technical Specifications

• Auxiliary Supply: 110V/220V AC/DC
• Rated CT Input: 1A / 5A
• 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 secondary protection cabinet system, cooperates with current transformers and Metrosil non-linear resistors
• Widely deployed in thermal power plants, captive power stations and distribution substations
• Used for busbar earth fault protection, generator stator earth fault protection and transformer winding unit protection