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Overview
The GE Multilin 239-RTD-AN is a sophisticated digital motor protection relay that delivers comprehensive protection and management for critical motors in industrial applications. By integrating direct RTD inputs, it provides accurate thermal protection based on actual motor winding temperatures, significantly enhancing motor lifespan and reliability.

Key Features & Benefits:

• Integrated RTD Inputs: Directly accepts signals from embedded motor RTDs, enabling precise thermal modeling and overload protection based on real-time winding temperature measurements, which is more accurate than conventional current-based thermal models.

• Comprehensive Protection Suite: Includes a wide range of protection functions such as overload (49), short-circuit (50), locked rotor (51LR), ground fault (50G/51G), unbalance (46), and under/over voltage (27/59).

• Advanced Motor Management: Provides detailed motor information including starts per hour, starts between rest time, and motor run status, supporting optimized motor operation and maintenance scheduling.

• Communications Capability: Supports communication protocols (such as Modbus RTU) for integration into SCADA and DCS systems, allowing for remote monitoring, control, and data acquisition.

• Dual CT Inputs: Accommodates both phase and ground current transformer inputs for complete system monitoring.

Technical Specifications:

• Product Series: Multilin 200 Series

• Protection Functions: Overload, short-circuit, ground fault, thermal (via RTD), unbalance, under/over voltage, etc.

• RTD Inputs: Typically supports multiple RTD inputs (e.g., 6 x RTD) for comprehensive temperature monitoring.

• Communication: Typically includes one or more serial communication ports (RS485) with Modbus RTU protocol.

• Control Power: Available in various standard AC/DC voltage ranges.

• Mounting: Designed for standard motor control center (MCC) or panel mounting.

Typical Applications:

• Protection of medium-voltage induction and synchronous motors in industrial plants

• Critical motor applications in water/wastewater treatment facilities

• Motor protection in mining, oil and gas, and chemical processing industries

• Integration into motor control centers (MCCs) for comprehensive motor management

Compatibility:
The 239-RTD-AN is compatible with standard current transformers, potential transformers, and RTDs commonly used in industrial motor applications.

Note: For complete technical specifications, installation guidelines, and setting calculations, refer to the official GE Multilin 239 series instruction manual.