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The 3RN2011-1BA30 is a Siemens SIRIUS 3RN2 series thermistor motor protection relay. It is primarily used to monitor motor temperature and prevent motor burnout due to overheating, and is commonly used in industrial automation and motor control applications.
Thermistor Motor Protection
Has ATEX explosion-proof certification
Standard industrial rail installation
As the central basic unit of the 3SK2 series, it features 20 fail-safe digital inputs (F-DI) and 4 fail-safe semiconductor outputs (F-DQ), capable of independently managing more than 4 to 5 complex safety functions. Its core advantage lies in its powerful software-configurable flexibility: via the SIRIUS Safety ES software, users can achieve a seamless transition from simple emergency stops to complex muting logic without modifying physical wiring. It supports the highest safety standards, up to SIL 3 (IEC 62061) and PL e (ISO 13849-1). Thanks to the 3ZY12 device connector at the bottom, the unit can be seamlessly integrated with 3RM1 fail-safe motor starters or 3SK1 expansion modules via backplane connection, greatly optimizing cabinet space and significantly reducing system integration costs. For small machinery systems seeking efficient diagnostics, rapid commissioning, and flexible logic protection, it is the optimal choice to achieve a win-win for both intrinsic safety and production efficiency.
Important Notice: Other accessories, manuals, cables, calibration data, software, etc. are not included with this equipment unless listed in the above stock item description.
Siemens 3RN2011-1BA30 Thermistor motor protection relay Manuals, Datasheets, Drivers, Link
Important Notice: Other accessories, manuals, cables, calibration data, software, etc. are not included with this equipment unless listed in the above stock item description.
Mining & Quarrying
Thermal protection for conveyor belt motors subjected to extreme dust and heavy material loads.
Chemical Industry
Monitoring agitator motors in mixing tanks where varying fluid viscosity can cause motor strain.
Pulp & Paper
Monitoring large pulp refiner motors that operate continuously under fluctuating mechanical stress.
Cement Manufacturing
Thermal monitoring of heavy-duty rotary kiln drive motors to prevent burnout during slow-speed high-torque operation.
Pharmaceutical Industry
Ensuring centrifuge motors operate within safe temperature limits to protect sensitive biological batches.
Water Treatment & Pump Stations
Protecting heavy-duty water pumps from overheating caused by dry running or clogged impellers.
When using the Siemens 3RN2011-1BA30, ensure the control supply is 24V AC/DC and strictly inspect the PTC sensor circuit for open or short circuits to prevent nuisance tripping. As this model features Auto RESET, the circuit design must include safety interlocks to prevent accidental auto-restarting once the motor cools. Additionally, regularly use the Test button to verify the protection logic and ensure the device is installed in a well-ventilated cabinet free from strong electromagnetic interference.
It is a Siemens SIRIUS series thermistor motor protection relay used to monitor motor winding temperatures.
What is the core function of 3RN2011-1BA30?
It trips to disconnect the control circuit and protect the motor when the internal PTC sensor detects overheating.
Which reset mode does 3RN2011-1BA30 support?
It supports Auto RESET, meaning it automatically returns to the operational state once the motor has cooled down.
Which sensor should be used with 3RN2011-1BA30?
It must be used with PTC thermistors (Type A) embedded in the motor windings.
What do the LEDs on 3RN2011-1BA30 indicate?
Typically, green indicates power is on, and red indicates a trip fault.
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