Product Core Brief
- Model: MCGG22L1CB0753E
- Brand: ALSTOM
- Series: ALSTOM MiCOM-Series Feeder Protection Relay
- Core Function: Digital feeder protection relay providing overcurrent, earth-fault, and programmable I/O protection for medium-voltage distribution feeders.
- Product Type: Feeder Protection Relay / Digital Protection Relay / Spare Protection Unit
- Key Specs: 50/51 overcurrent protection | 50N/51N earth-fault protection | 1 A/5 A CT input | Programmable binary I/O | RS-485 communication option | Panel or 19-inch rack mounting
- Condition: New Original / New Surplus
Product Introduction
ALSTOM MCGG22L1CB0753E is a MiCOM-series digital feeder protection relay used for medium-voltage feeder protection. It provides overcurrent and earth-fault protection with definite-time and inverse-time characteristics, making it suitable for MV distribution feeders, transformer secondaries, capacitor banks, motor feeders, and plant distribution boards.
The relay accepts 1 A or 5 A CT inputs and supports programmable binary inputs and relay outputs to match interlock, alarm, trip, and close schemes. Communication options typically include rear RS-485 with IEC 60870-5-103 or Modbus RTU, plus a front service port for configuration. It can be panel flush-mounted or installed in a 19-inch rack with an adapter kit.
Because the exact option set, firmware, CT/VT configuration, and I/O count may vary by build, the installed nameplate, relay setting sheet, and cabinet drawing should be checked before replacement.
Key Technical Specifications
| Parameter | Value |
|---|---|
| Full Model | ALSTOM |
| Product Type | Digital Feeder Protection Relay |
| System Platform | ALSTOM MiCOM-Series Protection Platform |
| Core Function | Overcurrent, earth-fault, and feeder protection |
| Protection Functions | 50/51 overcurrent; 50N/51N earth fault; definite/inverse time curves |
| CT Input | 1 A / 5 A, selectable per settings |
| Auxiliary Power | Typically 48–250 V DC or 48–240 V AC, option-dependent |
| Communication | RS-485 option; IEC 60870-5-103 / Modbus RTU; front service port |
| Installation | Panel flush mount or 19-inch rack with adapter kit |
| Operating Temperature | Typically –10 °C to +55 °C |
Quality Control Process
- Visual and code check: Confirm MCGG22L1CB0753E labeling, case condition, terminal blocks, and front HMI.
- Nameplate verification: Match auxiliary voltage, CT rating, option codes, and firmware baseline.
- Power-up test: Verify auxiliary supply, display, LED indicators, and keypad response.
- Protection function check: Confirm 50/51 and 50N/51N operation, trip timing, and binary output response.
- Final packing: Record test results, apply asset labels, and ship in anti-static packaging with terminal protection.
Replacement Pitfall Guide
❗ Confirm exact option code. MCGG22L1CB0753E variants may differ in auxiliary voltage, CT/VT inputs, communication options, and I/O count.
❗ Verify CT ratio and settings. Incorrect CT selection or setting migration can cause under-trip or nuisance trip.
❗ Check communication protocol. RS-485, IEC 60870-5-103, and Modbus RTU options must match the existing SCADA or gateway configuration.
❗ Validate trip/close wiring after replacement. Binary output mapping, interlocks, and breaker control circuits must be verified before return to service.
Keep these in mind and you’ll cut 90% of rework time.
Compatibility Matrix & Benchmarks
| Original Model | Replacement / Successor Model | Compatibility Level | Migration Notes |
|---|---|---|---|
| ALSTOM | ALSTOM | Direct | Like-for-like replacement when option code, CT rating, and settings match. |
| ALSTOM | Other MiCOM feeder relay variant | Needs Adaptation | Confirm auxiliary voltage, CT input, I/O count, and communication option. |
| ALSTOM | Newer MiCOM/GE/Multilin feeder relay | Needs Adaptation | Requires setting migration, wiring adaptation, and communication reconfiguration. |
- Typical use: MV feeder protection, transformer secondary protection, capacitor bank feeders, motor feeders, and industrial distribution boards.
- Key verification points: MCGG22L1CB0753E part number, auxiliary voltage, CT rating, protection functions, communication option, and installed setting sheet.
