🔹 Siemens SIRIUS Phase Failure Monitoring Relay – 3UG4615-1CR20 (3-Phase Protection Relay)
🔹 Product Description
The Siemens 3UG4615-1CR20 is a phase monitoring relay from the Siemens SIRIUS 3UG4 series, designed to ensure reliable and safe operation of three-phase electrical systems. It continuously monitors the supply for phase failure, phase sequence (rotation), phase imbalance, and voltage variations (overvoltage/undervoltage).
This relay is widely used in industrial motor protection systems, pumps, compressors, HVAC systems, conveyors, and automation panels, where stable three-phase supply is critical. It helps prevent motor damage caused by incorrect phase sequence, single phasing, or unstable voltage conditions.
The device operates by analyzing all three phases (typically 160–690 V AC range) and provides output contact switching when abnormal conditions are detected. It features adjustable thresholds, time delay settings, and LED status indication, making it suitable for both standard and critical industrial applications.
It belongs to Siemens’ network and voltage monitoring category, and newer systems often use the 3UG5 series as its successor for enhanced digital configuration and functionality.
🔹 Key Features
• Genuine Siemens SIRIUS 3UG4 series phase monitoring relay
• Model: 3UG4615-1CR20
• Monitors phase failure, phase sequence, and phase imbalance
• Detects undervoltage and overvoltage conditions
• Wide voltage range: 160–690 V AC three-phase systems
• Adjustable time delay (0–20 seconds)
• LED status indication for operational and fault conditions
• DIN rail mounting (compact 22.5 mm design)
• Industrial-grade electrical protection for motor systems
• Suitable for MCC panels and automation control systems
| Parameter | Specification |
|---|---|
| Product Series | Siemens SIRIUS 3UG4 |
| Model Number | 3UG4615-1CR20 |
| Product Type | Phase Failure Monitoring Relay |
| Function | Phase monitoring + voltage supervision |
| Voltage Range | 160 – 690 V AC (3-phase) |
| Monitored Conditions | Phase loss, phase sequence, imbalance, over/under voltage |
| Time Delay | 0 – 20 sec adjustable |
| Output Contact | 2 changeover contacts (DPDT) |
| Mounting Type | DIN rail |
| Application | Motor protection / Industrial power monitoring |
| Brand | Siemens |
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