Description
The GE Multilin 239-RTD-AN is an industrial protection relay designed to monitor and safeguard small-to-medium-sized three-phase AC motors against mechanical and electrical damage. During a recent integration at a regional mine ventilation site, we deployed this specific part number to add overtemperature and ground fault protection to a set of older conveyor motors.
Finding active factory support for legacy components can stall active plant turnarounds. General Electric has transitioned this product line to a last-time buy and legacy status. However, we maintain physical warehouse availability of this unit, shipping within 1 to 3 business days globally. Every module is backed by our full 12-month commercial warranty covering component degradation and display operation.
| Parameter | Value |
| Brand | GE Multilin (GE Vernova) |
| Model Number | 239-RTD-AN |
| Base Relay Series | 239 Motor Protection Relay |
| Product Condition | New Surplus / Clean Tested Refurbished |
| Installed Option “RTD” | Multi-channel Resistance Temperature Detector Inputs |
| Installed Option “AN” | Programmable Isolated 0–20 mA / 4–20 mA Analog Output |
| Input Isolation Voltage | 300 V |
| Standard Contact Rating | 10 A at 250 V AC (Resistive) |
| Control Power Windows | Dependent on specific terminal code (Verify on label) |
| Communication Interface | RS-485 Serial (Modbus RTU protocol) |
| Display Configuration | 40-Character Illuminated LCD Faceplate |
Commodity shortages and high demand for legacy motor protection platforms skew current aftermarket valuations. The pricing listed on our marketplace platform is a reference baseline rather than a static quotation. To lock in current market rates and confirm immediate tracking availability, please contact our international supply chain team for an itemized estimate.
Field Configuration: Scaling the “AN” Option and Resolving Trips
Why do commissioning crews frequently misinterpret the analog signal output on a freshly mounted 239-RTD-AN? The “AN” suffix means your relay includes an isolated, programmable analog circuit loop. If you link this loop directly to a remote panel meter or a PLC analog card without assigning the parameter source in the relay’s inner program tree, it defaults to zero current. You must explicitly assign the analog output parameters to track either Phase Current, Average Motor Load, or Thermal Capacity.
[Three-Phase Motor] ──> [CTs & RTDs] ──> [239-RTD-AN Relay] ──> [RS-485 Modbus Out]
│
(Isolated 4-20 mA)
│
└──> [PLC Card / Remote Meter] This design choice is actually clever for distributed control rooms—though your mileage may vary depending on wire run resistance. Well, technically the analog channel can drive up to a 600-ohm loop impedance, but if your copper cabling distance exceeds 300 meters, signal attenuation might inject noise into your PLC readings.
Don’t underestimate the protection sequence setup when using the optional RTD sensor inputs. If you run three-wire Pt100 sensors embedded inside the motor windings, ensure the relay’s internal unbalance trip delay matches your motor manufacturer’s thermal damage curve. Setting an arbitrary 0-second unbalance delay will cause nuisance trips during incoming line voltage fluctuations, shutting down your motor starter needlessly.
Cross-Border Shipping, HS Classifications, and Trade Risk
Transporting industrial electronics requires strict adherence to international shipping laws to prevent hardware cargo holds at ports of entry. We handle all cross-border clearance processing using the standard Harmonized System (HS) code 85363030 for industrial electrical protection relays. This ensures customs clearance personnel apply the correct tariffs according to international bilateral agreements.
Every logistics run includes full documentation sets: customized commercial invoices, detailed export packing slips, and direct tracking manifests. We adapt our supply chains to match your facility’s internal shipping preferences:
- Express Air Cargo (DHL / FedEx / UPS): Best for emergency breakdowns or facility outages; transit takes 3 to 5 business days globally.
- Air Freight (Airport-to-Airport): Optimized for multi-unit batch upgrades where freight forwarders consolidate local cargo.
- Sea Freight (LCL): Recommended for long-term project staging where budget takes precedence over shipping velocity.
While we typically operate under standard Free Carrier (FCA) rules where your forwarder assumes responsibility at our loading dock, our trade branch can offer Delivered At Place (DAP) routing directly to your destination. Import VAT, custom processing surcharges, and municipal duties vary significantly between destination countries (e.g., US vs. Australia) and are handled by the destination importer at the port boundary.
Maintenance Engineering FAQ
What distinguishes the 239-RTD-AN from the standard base 239 model?
The base 239 provides fundamental overcurrent tracking and basic thermal monitoring via thermistors. The 239-RTD-AN specifically contains hardware expansions for multiple RTD sensor elements and includes an isolated analog output channel for loop feedback.
What software is used to modify setpoints on this relay series?
You can adjust parameters manually using the front keypad, or connect a PC via the serial port using EnerVista Setup software. Make sure you match the Modbus slave address and baud rate in the communication menu before attempting a software upload.
How can I tell if my unit has the “H” harsh environment option?
Check the complete barcode sticker on the side of the housing. If the model reads 239-RTD-AN-H, the internal circuit boards have been factory-treated with a protective conformal coating to prevent corrosion from humidity or airborne particulates.
