Alstom MAE99-04

Product Introduction:

The Alstom MAE99-04 is a dedicated serial communication isolation module used in Alstom (now GE Grid Solutions) protection & control systems — e.g., MiCOM P-series relay rear-interface or excitation/DCS communication cabinets. It provides eight independent galvanically isolated RS-232 / RS-485 channels to break ground loops and protect control system ports from surge or common-mode voltage in power plant and railway signalling environments.

Category: ALSTOM

Description

Key Technical Specifications:

Manufacturer: Alstom (now supported under GE Vernova / GE Grid Solutions)
Model: MAE99-04
Function: 8-channel serial comms isolator (Tx/Rx transparent pass-through)
Supported Interfaces: RS-232 and RS-485 (configurable per channel pair)
Isolation Voltage: 1500 VAC (1 min) channel-to-system; channels mutually isolated
Data Rate: Up to 115.2 kbps
Supply Voltage: 24 VDC (typical range 19–30 VDC), <5 W consumption
Indicators: Power LED + per-channel activity/fault LEDs (some versions)
Alarm Output: 1× form-C relay contact for module fault (optional)
Operating Temp: –25 °C to +70 °C
Mounting: DIN rail or rack-card slot (system-dependent)
Dimensions (approx.): 100 × 70 × 50 mm (DIN version) or plug-in card format for Alstom rack
Certifications: CE, UL, IEC 61850/ IEC 60255environment compliance

Functional Features:

Breaks ground loops between disparate earth potentials in large plants
Protects costly relay/protection IED communication ports from surge
Transparent to protocol — works with Modbus RTU, DNP3 over serial, IEC 60870-5-101, proprietary Alstom protocols

Application Scenarios:

Fossil-fuel / combined-cycle power plant excitation system comms isolation
Railway traction substation protection IED serial link isolation
Any Alstom Micom-based scheme requiring galvanic separation of serial links

Material & Structure:

FR4 PCB with opto-couplers and DC-DC isolated power per channel
Metal or plastic DIN enclosure (version-dependent)
Screw terminal blocks for serial pairs and power

Installation & Notes:

Ensure correct RS-232 vs RS-485 jumper/wiring per port
Do not exceed maximum baud rate if cable length >1200 m (RS-485)
Verify 24 VDC supply is from a clean, non-noisy source — prefer separate fused supply

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