Siemens Thermistor Motor Protection Monitoring Relay With CO, NO Contacts, 240 V ac/dc Supply Voltage, Motor Voltage

  • RS Stock No. 175-2297
  • Mfr. Part No. 3RN2023-1DW30
  • Brand Siemens
Technical Reference
Legislation and Compliance
RoHS Certificate of Compliance
COO (Country of Origin): DE
Product Details

Siemens Thermistor motor protection relay

The Siemens thermistor motor protection relay is a reliable over temperature protection device to save the motors from overload. This relay has a mechanism for temperature monitoring and advanced sensing for cutting OFF power to the motor when it exceeds a certain initially set threshold. It senses winding temperature to evaluate the motor for overloading or overheating. The ATEX certification provides an extra layer of protection which makes it ideal to function in hazardous environments. It also has many advanced features like test/reset button, provision for wire break monitoring, short circuit monitoring and two separate PTC sensor circuits. Like any other Siemens relay, this motor protection relay guarantees minimum shutdown time, high efficiency and sustainable long life.

Features and Benefits

• Compact design
• Contacts configuration: CO, NO
• Cost efficient
• High accuracy
• High endurance
• LED status indicator
• Long mechanical life of 10M cycles
• Resistant to shock and vibration
• Smart sensing


• Cement works
• Industrial automation
• Machine temperature monitoring
• Paper industry
• Power stations
• Textile industry


• ATEX certified
• CCC approved
• CE certified
• CSA certified
• EAC approved
• IP20 rating
• UL approved

Attribute Value
Monitoring Application Thermistor motor temperature protection
Supply Voltage 240 V ac/dc
Contact Configuration CO, NO
Voltage Sensitivity Motor Voltage
Voltage Sensing Range 24 → 240 V ac/dc
Width 91.6mm
Length 22.5mm
Minimum Operating Temperature -25°C
Series 3RN2
Hazardous Area Certification ATEX
Height 100mm
Mounting Type DIN Rail
Terminal Type Screw
Operating Temperature Range -25 → +60 °C
Dimensions 22.5 x 91.6 x 100 mm
Maximum Operating Temperature +60°C
4 In stock for delivery within 1 working days
Price Each
£ 189.56
(exc. VAT)
£ 227.47
(inc. VAT)
Per unit
1 - 4
5 +
Not available for guaranteed pre 9am/10am delivery
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