Description
The GENERAL ELECTRIC 239-RTD-AN Motor Protection Relay is a GE Multilin intelligent protection device designed for comprehensive protection and monitoring of three-phase AC motors. It provides protection functions against motor overload, short circuit, ground fault, phase unbalance, undercurrent, mechanical jam, and overheating conditions.
The 239-RTD-AN model includes RTD temperature monitoring capability and an isolated programmable analog output option. It can monitor stator and bearing temperatures through RTD inputs while providing real-time motor operating data through RS485 Modbus communication.
This relay is commonly used in industrial plants, power generation facilities, water treatment systems, pumps, compressors, fans, conveyors, and other motor-driven equipment requiring reliable protection and condition monitoring.
239-RTD-AN
🔹 Product Parameters
| Parameter | Value |
|---|---|
| Brand | GENERAL ELECTRIC / GE Multilin |
| Model | 239-RTD-AN |
| Series | GE Multilin 239 Motor Protection Relay Series |
| Product Name | Motor Protection Relay |
| Application | Three-Phase AC Motor Protection & Monitoring |
| Product Status | New Surplus / Used Tested Available |
| Dimensions | Approx. 162 × 162 × 150 mm |
| Weight | Approx. 1.36 kg |
| Origin / Place of Origin | Canada |
| Power Supply | 70–265 VAC 50/60 Hz or 90–300 VDC |
| Power Consumption | Approx. 20 VA |
| RTD Input | 3 RTD Temperature Inputs (Stator/Bearing Monitoring) |
| Communication Interface | RS485 Modbus RTU |
| Analog Output | Single Isolated Programmable Analog Output |
| Mounting Type | Panel Mount Installation |
| Discontinued | Legacy Product / Manufacturing Discontinued |
🔹 Common Questions & Answers (Q&A)
Q: What is the main function of GE 239-RTD-AN?
A: The relay protects three-phase AC motors by monitoring electrical and thermal conditions and initiating alarms or trips when abnormal conditions occur.
Q: What protection functions does this relay provide?
A: It provides thermal overload, phase short circuit, ground fault, current unbalance, undercurrent, mechanical jam, and motor overtemperature protection.
Q: What does the RTD option provide?
A: The RTD function allows direct temperature monitoring of motor stator and bearing areas using compatible resistance temperature detectors.
Q: What is the purpose of the AN option in 239-RTD-AN?
A: The AN option provides a single isolated programmable analog output that can represent parameters such as phase current, thermal capacity, or RTD temperature values.
Q: What are common failure symptoms of a faulty 239-RTD-AN?
A: Common issues include false trip alarms, incorrect temperature readings, communication loss, display failure, relay output malfunction, or power supply faults.
Q: Can the 239-RTD-AN replace another GE Multilin relay directly?
A: Replacement requires checking motor ratings, CT configuration, RTD wiring, communication settings, firmware compatibility, and protection parameters before installation.
Q: Is the GE 239-RTD-AN still manufactured?
A: The GE Multilin 239 series is a legacy product, and manufacturing has been discontinued. Replacement solutions include newer GE protection relay families depending on application requirements.
🔹 Recommended GENERAL ELECTRIC Models
- GE Multilin 239-RTD-AN – Motor Protection Relay
- GE Multilin 239-RTD – Motor Protection Relay
- GE Multilin 239 – Motor Protection System
- GE Multilin 269PLUS – Motor Management Relay
- GE Multilin 269PLUS-DO-215-100P-120 – Motor Protection Relay
- GE Multilin 369-HI-R-M-0-0-0 – Motor Management Relay
- GE Multilin 369-HI-R-M-F-0-0 – Motor Management Relay
- GE Multilin 469-P5-HI-A20-E – Motor Protection Relay
- GE Multilin 469-P5-HI-A20 – Motor Management Relay
- GE Multilin 489-P5-LO-A20 – Generator/Motor Protection Relay
- GE Multilin 869-P5-HI-A20 – Motor Protection Relay
- GE Multilin 889-P5-LO-A20 – Motor Protection Relay
- GE Multilin SR469-P5-HI-A20 – Motor Management Relay
- GE Multilin SR489-P5-HI-A20 – Generator Protection Relay
- GE Multilin 339 Motor Protection System
