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Technical specifications for 239-RTD-AN
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Manufacturer:General Electric
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Product Category:General Automation
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Spare Part Number:239-RTD-AN
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Estimated shipping dimensions:12x12x18.3cm
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Weight:1.7 kg
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Tariff Code:8537101190
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Counliy of origin:USA
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Product family:Multilin 239 Motor Protection System
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Protected equipment:Three-phase AC motors and associated mechanical equipment
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RTD option:3 programmable stator or bearing RTD inputs
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Supported RTD types:100 ohm platinum, 120 ohm nickel, 100 ohm nickel and 10 ohm copper
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Analog-output option:One isolated output selectable as 0-1 mA, 0-20 mA or 4-20 mA
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Analog-output sources:Thermal capacity, percent full load, phase current or RTD temperature
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Phase CT inputs:Three isolated inputs for 1 A or 5 A secondaries
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Standard temperature input:NTC or PTC thermistor
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Communications:RS-485 with Modbus RTU
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Protection functions:Thermal overload, current unbalance, mechanical jam, short circuit, ground fault and undercurrent
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Temperature protection:Stator and bearing overtemperature with the RTD option
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Output relays:Trip, alarm, auxiliary and service relays
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Lifecycle:Legacy product
Information
Overview
Manuals
Common Applications
Product Precautions
Applied to a three-phase AC motor, GE 239-RTD-AN monitors electrical loading and direct temperature inputs so the starter or breaker can respond to damaging motor and driven-equipment conditions.
- Three programmable stator or bearing RTD inputs
- Isolated 0-1 mA, 0-20 mA or 4-20 mA analog output
- Thermal overload, unbalance, jam and ground-fault protection
- RS-485 Modbus RTU communication
The RTD option accepts supported platinum, nickel and copper sensor types, while the AN option can retransmit thermal capacity, motor current or an RTD temperature. Phase-current inputs, ground-current supervision, configurable digital inputs and output relays provide the protection interface to the motor circuit. Before service, retain CT ratios, full-load current, thermal model, RTD type, trip logic, analog scaling and serial settings; final testing must prove each used protection element and its assigned output.
Important Notice: Confirm the complete GE 239-RTD-AN order code, control-power version, CT inputs, RTD wiring and approved motor-protection settings before installation.
GE 239-RTD-AN Manuals & Downloads
GE 239-RTD-AN Technical Reference (PDF)GE 239-RTD-AN Installation & Commissioning Guide (PDF)
The first document is a product-specific technical reference for GE 239-RTD-AN; the second organizes a separate installation, configuration, testing and handover workflow.
Medium-motor protection
Supervises current, thermal capacity and direct winding or bearing temperature on a configured motor feeder.
Small low-voltage motor protection
Combines overload, unbalance, jam, short-circuit, ground-fault and undercurrent elements in one relay.
Motor temperature monitoring
Uses three programmed RTDs and the standard thermistor input for stator or bearing protection.
Analog condition retransmission
Sends a selected thermal, current or RTD value to a meter or control system through the isolated output.
Read the applicable GE instructions before work. Verify 239-RTD-AN and the installed system configuration before isolation or replacement.
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Record the complete GE 239-RTD-AN order code, serial record and panel position.
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Place the motor, starter or breaker and control circuits in the approved maintenance state.
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Short and isolate energized CT secondary circuits with the approved test facilities before disconnection.
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Back up CT ratios, full-load current, thermal model, trip logic, communications and analog scaling.
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Identify all three RTDs, their sensor types, locations and two- or three-wire terminations.
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Verify the installed control-power version and every relay-output circuit before energization.
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Perform secondary-injection and resistance checks for each used current, ground and RTD function.
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Prove trip, alarm, analog-output and communication behavior before returning the motor to service.
Technical notes
Use the current motor study, CT data and starter or breaker wiring to validate all relay settings. The RTD and analog-output suffixes must be preserved because they define installed hardware functions.
FAQ View All FAQ
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What protection role does GE 239-RTD-AN perform?GE 239-RTD-AN protects a three-phase AC motor by supervising current, thermal capacity, temperature and configured process conditions.
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How many temperature sensors can the RTD option on 239-RTD-AN monitor?The RTD option provides three programmable inputs for stator or bearing temperature sensors.
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Which RTD types are supported by GE 239-RTD-AN?GE documents 100-ohm platinum, 120-ohm nickel, 100-ohm nickel and 10-ohm copper RTD types for the relay.
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What can the AN output on GE 239-RTD-AN transmit?The isolated analog output can retransmit thermal capacity, percentage of full load, phase current or a selected RTD temperature.
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Which analog ranges can 239-RTD-AN provide?The customer-selectable isolated output supports 0-1 mA, 0-20 mA and 4-20 mA ranges.
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How does GE 239-RTD-AN communicate with a supervisory system?The relay uses an RS-485 serial interface with Modbus RTU for remote settings, status and data access.
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Which settings must be retained before 239-RTD-AN is replaced?Technicians should retain CT ratios, motor full-load current, thermal model, protection setpoints, RTD configuration, relay logic, analog scaling and serial settings.
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What confirms GE 239-RTD-AN commissioning?Commissioning is complete after secondary-injection, RTD-resistance, trip, alarm, analog-output and communication tests confirm the approved protection design.
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