Product Overview

• Part No: MCGG22L1CB0753E
• Brand: ALSTOM

• Category: Static Overcurrent & Earth Fault Protection RelayMCGG22L1CB0753E belongs to ALSTOM classic MCGG series plug-in static relay. It monitors AC current signals continuously and provides multi-stage adjustable overcurrent, earth fault and optional instantaneous protection. The relay outputs trip and alarm contacts upon detecting abnormal fault current to isolate faulty feeders, motors and transformers. Equipped with transparent protective cover and setting switches for on-site parameter commissioning, it is widely adopted as replacement spare in thermal power plants, captive power stations and distribution substations.

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Core Features

• Configurable definite time or inverse time overcurrent and earth fault protection
• Adjustable operating current and time delay for selective protection coordination
• Transparent front cover for convenient setting access and status observation
• Standard plug-in modular structure supporting rapid field replacement
• Multiple programmable changeover contacts for trip command and fault alarm
• Built-in surge suppression circuit with high immunity to substation electromagnetic interference

• Passed EMC, vibration and thermal cycling reliability tests for long-term continuous service

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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

• Compatible with ALSTOM legacy secondary protection cabinet systems
• Widely applied in thermal power plants, industrial power stations and distribution substations
• Used for medium voltage feeder, motor and transformer backup overcurrent and earth fault protection