AL129A | GE Electric Multilin ™ Digital protection relay
Product Description
The GE AL129A is a Multilin™ Digital Protective Relay designed for comprehensive motor protection and control in industrial applications. It integrates advanced monitoring, diagnostics, and trip functions to prevent motor damage from electrical faults (e.g., phase loss, overload, ground faults) while enabling predictive maintenance through real-time data analytics.
Key Features
- Multi-Function Protection: 12+ protection elements (overload, stall, short-circuit, imbalance).
- Dynamic Thermal Modeling: Emulates motor heating/cooling characteristics for accurate overload prevention.
- Enhanced Diagnostics: Vibration analysis, bearing wear monitoring via optional PT100/1000 inputs.
- Dual Communication: Built-in Modbus RTU (RS485) + Ethernet/IP for SCADA integration.
- Oscillographic Recording: Captures 128 cycles of pre/post-fault waveforms.
- Rugged Construction: -40°C to +85°C operation with 50g shock resistance.
Product Specifications
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Parameter
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Specification
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Protection Functions
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Overload (49), Locked Rotor (51LR), Phase Loss (46), Ground Fault (50G/51G)
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Control Voltage
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24–240 V AC/DC (auto-sensing)
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Current Inputs
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5A or 1A (configurable), ±0.5% accuracy
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Relay Outputs
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4x Form-C (mechanical), 3A @ 250V AC
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Analog Inputs
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2x 4–20mA (isolated for PT/CT sensors)
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Display
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240×128 LCD with backlight
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Protocols
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Modbus RTU, DNP3.0, IEC 61850 (optional)
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Compliance
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UL 508, IEC 60255, CE, cULus
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Series Overview
Part of GE’s Multilin™ 800 Series Motor Protection Relays:
- AL Range: Advanced motor protection (AL129A = Standard I/O variant).
- Compatible Relays: AL132 (high-voltage), AL125 (basic protection).
- Firmware Platform: Unity Pro-compatible for seamless logic programming.
Applications
- Industrial Motors: Pumps, compressors, conveyors (>50 HP).
- Mining: Crusher motor protection in dust-heavy environments.
- Water/Wastewater: Critical pump station control.
- HVAC Systems: Chiller motor monitoring.
- Oil & Gas: ESP (submersible pump) protection.
Functional Role
- Fault Prevention: Trips within 20ms for phase-to-phase faults.
- Load Management: Starts/stops motors via integrated contactor control logic.
- Energy Optimization: Tracks kWh consumption and efficiency trends.
- Predictive Maintenance: Alerts on winding insulation decay (ΣI²t algorithm).
Why Choose AL129A?
- Motor Lifespan Extension: Reduces thermal stress by 40% via adaptive thermal models.
- Reduced Wiring: Integrates protection, metering, and control in 1 device.
- Cyber Security: IEC 62443-3-3 compliant with role-based access.
- Legacy Migration: Replaces electro-mechanical relays without panel modifications.
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