Protective Relays and Monitoring Relays from RS Components, Ltd.


3927267 -- View Larger Image

3RN1 thermistor motor protection devices are thermal protection devices that are suitable, in combination with type A PTC resistors (cold conductors), for monitoring the temperature of electrical drives, transformer windings, oils, bearings, air etc.
Work according to the closed circuit current principle (monostable design) and therefore self-monitoring with regard to wire breakage. Triggered when control voltage fails. Electrical separation for devices with AC control voltage. Overall width of 22.5 mm. Screw connection
Monitoring Application = Temperature
Supply Voltage = 24 V ac/dc
Contact Configuration = SPDT
Temperature Sensitivity = Overtemperature, Undertemperature
Temperature Sensing Range = +60 - +180°C
Maximum Temperature Sensed = +180°C
Minimum Temperature Sensed = +60°C
Minimum Operating Temperature = -25°C
Width = 22.5mm
CAD Drawing = 3D CAD Model


Siemens Corporation
Manufacturer Part Number
Product Category
Protective Relays and Monitoring Relays
Operating Temp
-13 F (-25 C)
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