3RN1012-1BG00 SIEMENS

The 3RN1012-1BG00 from Siemens is a phased-out thermistor motor protection evaluation unit, with the recommended successor being the 3RN2012-1BW30. This standard evaluation unit is designed to safeguard motors against overheating by monitoring the temperature of thermistors embedded within the motor windings. It offers versatile operation modes, including manual, automatic, and remote reset capabilities, providing flexibility in various application scenarios. The unit consumes a low power of 2W and operates on a 110V AC power supply. It is engineered to detect overtemperature conditions and trigger protective actions, preventing motor damage and downtime. Its primary function is to evaluate the signals from PTC thermistors, which change resistance with temperature variations. When a critical temperature is reached, the unit activates a relay output, which can be used to shut down the motor or trigger an alarm. This device is crucial for ensuring the longevity and reliability of electric motors in industrial environments. While the 3RN1012-1BG00 is no longer in production, it remains a relevant component in existing systems, highlighting the importance of motor protection in industrial applications.