The Siemens 3RN2010-1BW30 thermistor relay is a compact and reliable solution for monitoring the temperature of electric motor windings using PTC sensors. It helps prevent motor overheating by activating control circuits when temperature thresholds are exceeded. With 2 normally open output contacts and support for a wide control voltage range (24–240V AC/DC), it is suitable for global applications in industrial motor protection. Its DIN rail mounting design allows for easy integration into electrical panels, ensuring rapid thermal response and safe motor shutdown during overheating events. ⚙️ Technical Specifications (EN): Part Number: 3RN2010-1BW30 Function: Motor temperature protection using PTC sensors Control Voltage: 24–240V AC/DC Sensor Type: PTC thermistors Output Contacts: 2 NO (normally open) Mounting Type: DIN rail Response Type: Triggers when temperature exceeds sensor threshold LED Indicators: Yes – for status and fault display Application: Motor winding protection in industrial automation Standards Compliance: IEC/EN 60947-5-1, IEC/EN 60947-8