The Siemens 3UG4616-1CR20 is a multifunction monitoring relay designed for comprehensive supervision of critical electrical parameters in industrial 3-phase systems. It monitors overvoltage, undervoltage, active power loss, earth fault (residual voltage), and both phase sequence and phase failure. This all-in-one solution helps ensure system reliability, reduce downtime, and protect equipment from voltage instability, imbalance, or grounding issues. Ideal for advanced automation and power distribution setups, the device supports DIN rail mounting and offers configurable thresholds with LED status feedback. ⚙️ Technical Specifications (EN): Part Number: 3UG4616-1CR20 Function: Multifunction relay (voltage, power, earth, phase sequence/failure) System Type: 3-phase systems Voltage Range: Configurable (typically 3×400 V AC) Earth Fault Detection: Residual voltage monitoring Mounting Type: DIN rail Output Contacts: 1 changeover (SPDT) Indication: LED status indicators Response Time: Fast fault response and trip Application: Motor control, generator protection, automation safety Standards Compliance: IEC/EN 60255, IEC/EN 60947-5-1