Siemens Thermistor motor protection relay Monitoring Relay With SPDT Contacts, 24 V ac/dc Supply Voltage

  • RS Stock No. 392-7245
  • Mfr. Part No. 3RN1011-1CB00
  • Brand Siemens
Technical Reference
Legislation and Compliance
RoHS Certificate of Compliance
Product Details

SIRIUS 3RN10 10 // 11 Thermistor motor protection relay

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

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.


EN 50081-2, EN 50082-2 and DIN VDE 0660 Parts 302 and 303 and IEC 34-11-2 Section 1 and 2


!!! Phase-out product !!! This product is in obsolescence mode and is due for discontinuation by the manufacturer. We recommend that you review the preferred successor proposed by the manufacturer: 175-2281 (3RN2011-1BA30)

Siemens 3RN1 Thermistor Relays

3RN1 thermistor relays are a range of thermal protection devices, which when used in conjunction with external PTC thermistors, offer temperature monitoring of electrical drives, transformers and other critical components such as bearings. The 3RN1 range operates on the principle of closed-circuit current and are therefore self monitoring in the event of sensor wire breakage.

Attribute Value
Monitoring Application Thermistor motor protection relay
Supply Voltage 24 V ac/dc
Contact Configuration SPDT
Temperature Sensitivity Overtemperature, Undertemperature
Temperature Sensing Range +60 → +180°C
Operating Temperature Range -25 → +60 °C
Height 102mm
Maximum Temperature Sensed +180°C
Width 22.5mm
Maximum Operating Temperature +60°C
Dimensions 91 x 22.5 x 102 mm
Minimum Temperature Sensed +60°C
Minimum Operating Temperature -25°C
Length 91mm
3 In stock - FREE next working day delivery available
3 available from Europe for delivery within 1 working day(s)
Price Each
£ 80.20
(exc. VAT)
£ 96.24
(inc. VAT)
Per unit
1 - 4
5 +
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