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3 year warranty

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Motor Protection Relay Model 239-RTD has three programmable RTD types, nickel, platinum, or copper. This model has three mix stator/beating RTDs. The control power for the relay is a standard 70 to 265 VAC.



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  • Part Number: 239-RTD
  • SKU: 239RTDGM
  • Manufacturer: GE Multilin
  • Series: 239 Motor Protection Relay

239-RTD Technical Specifications

Ambient Temperature Range –10°C to +60°C
Dielectric Strength Type Tests 2.0 kV for 1 Minute to Relays, CTs, Power Supply
Humidity 95%, non-condensing
Phase Current CT Inputs 1 A and 5 A Secondary
Shipping Weight Approximately 5 lbs.
Thermal Start Protection Separate Start and Run Protection
Thermistor Cold Resistance 100 to 30,000 Ω
UL Compliance E83849 UL listed for the USA and Canada

Product Description

During the operation of this model when being used in the Motor Protection Relay series, which was manufactured by General Electric Three types of RTDs that can be used with the 239-RTD model are one-hundred-ohm nickel, one-hundred-and-twenty-ohm nickel, and ten-ohm copper. Proper programming is required so that when the RTD has been installed the input of the corresponding RTD is correct.  When being used outside of the factory the RTD for this relay is one-hundred-ohm platinum.

The 239 is a relay that senses signals provided by the motor bearings and/or the RTDs that are placed in the stator slots. An internally connected ground safety is available on the 239-RTD model in terminal thirteen. If using the ten-ohm copper RTD with this relay please take care that the lead resistance is at the lowest range possible. 

The working temperature range of this model is about negative forty to two hundred degrees Celsius, which equates to negative forty to four hundred degrees Fahrenheit. There is also an alarm/trip temperature range of around zero to two hundred degrees Celsius. The dead band for this relay is two degrees Celsius (four degrees Fahrenheit). The accuracy of the 239-RTD is either positive or negative two degrees Celsius. 

The Pt or Ni RTD has a lead resistance of 25 Ω ohm max. The Cu RTD has a lead resistance of 3 Ω ohm max with three-wire lead resistance compensation. 

More information about the operation, installation and other features of the 239-RTD can be found in the 239 Motor Protection Relay Instruction Manual. The order code that helps determine the model type and some of its functions can be found in the first chapter of the manual on page seven. 

Frequently Asked Questions about 239-RTD

How does the 239-RTD Multilin relay protect from damage to motors?
The GE Multilin 239-RTD actually sounds an alarm prior to damage from a process malfunction. It can also diagnose and verify correct function. 
Does it matter what voltage is for the motor being protected by the 239-RTD?
No, the voltage does not matter. The 239-RTD system will protect a motor regardless of the specific voltage. 
How many relays are needed?
One 239-RTD relay is needed for each motor, even though motors can be guarded no matter which voltage they are. 
What differentiates the 239-RTD from the 239-RTD-AN and from the 239-RTD-AN-H?
The GE multilin 239-RTD is different from the 239-RTD-AN and from the 239-RTD-AN-H in terms of its composition. The 239-RTD is made to protect three motors, and has a programmable feature. It is also composed of copper, nickel, and platinum. 

Reviews For 239-RTD

Internal Review

When searching for a model that has multiple accessories including ground and phase CTs, as well as an RS232 to RS485 converter the 239-RTD model is the perfect model. - AX Control Technician

Repair Services For 239-RTD

Type Lead Time Price Action
Repair Service 1-2 weeks $1685

Our highly skilled technicians can repair your 239-RTD. All of our repairs come with a 3 Year AX Control Warranty. Please contact us for additional information about our repair process. To receive the repair pricing and lead time listed above please process your repair order via our website. The following repair options may be available upon request:

  • 48-72hr Rush Repair
  • Detailed Repair Reports
  • AX Control Certificate of Warranty

AX Control Warranty Info

All products we sell are backed by our unparalleled warranty. A warranty certificate will be provided with your order upon request.
All PLCs, HMIs, and Turbine Control Boards: 3 Years
All AC/DC and Servo Drives: 2 Years
All Motors: 1 Year
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239-RTD Manuals, White Papers, Data Sheets, and Troubleshooting