Product Description

The 239-RTD, or resistance temperature detector, is a part originally manufactured by GE. Up to three (3) RTDs must be supplied with a motor.

The other RTDs that can be used with the 239 are one-hundred (100 Ω) ohm nickel, one-hundred and twenty (120 Ω ) ohm nickel, and ten (10 Ω) ohm copper. The 239 requires proper programming so that each RTD input matches up with the installed type. Out of the factory, the 239 default is one-hundred (100Ω) 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. The 239-RTD has an internally connected ground safety (terminal thirteen). If using the ten ohm copper RTD take care that the lead resistance is as low as possible.

The 239-RTD has a working temperature range -40 to 200 ° C, which equates to -40 to 400 ° F. The trip or alarm range is between 0 to 200 ° C or 0 to 400 ° F.

The dead band for the 239-RTD is two degrees Celsius or four degrees Fahrenheit. The accuracy of the 239-RTD is  ( ± 2 ° C )  or  ( ± 4 ° F).

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

*Please see GE Power Management 239 Motor Protection Relay Instruction Manual.

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