The Siemens 3UG4512-1AR20 is an advanced monitoring relay designed to ensure safe operation of three-phase systems by detecting two critical conditions: incorrect phase sequence and phase failure. This device is essential for protecting industrial motors, pumps, compressors, and other equipment from potential damage caused by electrical imbalances. It features a DIN rail mountable design, making installation easy in industrial control panels. With high accuracy and fast response, it helps prevent unexpected downtime and system faults. ⚙️ Technical Specifications (EN): Part Number: 3UG4512-1AR20 Function: Phase sequence and phase failure monitoring System Type: 3-phase Operating Voltage: According to system config (typ. 3×400 V AC) Mounting Type: DIN rail Response Time: Immediate detection of anomalies Output Contacts: 1 changeover (SPDT) contact Indication: LED status indicators Application: Industrial motor and equipment protection Standards Compliance: IEC/EN 60255, IEC/EN 60947-5-1