Siemens Digital monitoring relay for 3-phase voltage

Product Overview

Advanced digital monitoring relay specifically designed for comprehensive three-phase voltage monitoring with neutral conductor (N-conductor) connection capability. This SIRIUS 3UG4 series monitoring relay provides dual-channel voltage protection with configurable phase sequence detection, phase failure monitoring, and independent undervoltage (Umin) and overvoltage (Umax) protection across a voltage range of 90-400 V AC. The device features digital adjustment capabilities with LCD display, fault memory function, and dual independent changeover contacts optimized for systems requiring neutral conductor monitoring.

Key Features

• Digital monitoring relay with LCD display and digital adjustment interface
• Three-phase voltage monitoring with neutral conductor (N-conductor) capability
• Configurable phase sequence monitoring (can be activated/deactivated)
• Comprehensive phase failure detection with immediate response
• Independent undervoltage (Umin) and overvoltage (Umax) protection channels
• Voltage range: 3 x 90-400 V AC optimized for low-voltage applications
• Adjustable hysteresis: 1-20 V for stable operation and contact chatter prevention
• Independent timing control: 0-20 seconds for both Umin and Umax functions
• Dual independent changeover contacts for separate control applications

Technical Specifications

• Article Number: 3UG4616-1CR20
• Monitoring Functions: Phase failure, configurable phase sequence, undervoltage, overvoltage with N-conductor
• Supply Voltage Range: 3 x 90...400 V AC (with neutral conductor connection)
• Frequency Range: 50...60 Hz
• Voltage Monitoring Range: 90-400 V (both Umin and Umax)
• Hysteresis Range: 1-20 V (adjustable)
• Delay Time Range: 0-20 seconds each for Umin and Umax
• Contact Configuration: 2 independent changeover contacts (1 CO for Umin, 1 CO for Umax)
• Connection Type: Screw terminal with removable terminals
• Display: LCD with digital adjustment capabilities
• Width: 22.5 mm (DIN rail mounting)
• Operating Temperature Range: -25°C to +60°C
• Protection Class: IP20
• Net Weight: 0.161 kg
• EAN: 4011209642379
• Country of Origin: Germany

Applications & Use Cases

• Low-voltage three-phase systems requiring neutral conductor monitoring
• Mobile systems with unstable power networks (A/C compressors, refrigerated containers)
• Construction site equipment requiring voltage stability monitoring
• Industrial applications with 90-400V AC power systems
• Systems requiring independent undervoltage and overvoltage protection
• Applications demanding configurable phase sequence monitoring
• Equipment protection in environments with variable power quality

Advanced Digital Features

• LCD Display: Real-time voltage values, system status, and fault indication
• Digital Adjustment: Precise threshold setting with digital interface eliminates analog potentiometers
• Fault Memory: Records and displays fault conditions for diagnostic and maintenance purposes
• Configurable Phase Sequence: Monitoring can be enabled or disabled based on application requirements
• Independent Channel Control: Separate timing and threshold settings for Umin and Umax
• N-Conductor Capability: Neutral conductor connection for enhanced system monitoring
• Wide Adjustment Range: Flexible hysteresis and timing settings for diverse applications

Monitoring Capabilities

• Phase Failure Detection: Immediate detection of any phase loss condition
• Configurable Phase Sequence: Selectable L1-L2-L3 rotation monitoring with neutral reference
• Undervoltage Protection (Umin): Adjustable threshold with independent contact output
• Overvoltage Protection (Umax): Adjustable threshold with independent contact output
• N-Conductor Monitoring: Enhanced monitoring capability with neutral conductor connection
• Hysteresis Control: 1-20 V adjustable range prevents contact chatter and ensures stable operation
• Independent Timing: 0-20 second delay range for each protection function prevents nuisance tripping
• Real-Time Display: Continuous monitoring values and comprehensive fault status indication

Design & Installation Benefits

• Compact 22.5mm width optimizes control cabinet space utilization
• DIN rail mounting for standard industrial installation practices
• Removable screw terminals facilitate pre-wiring and maintenance procedures
• Digital interface eliminates need for analog adjustment components
• LCD display provides clear indication of settings and measured values
• Fault memory function assists in troubleshooting and predictive maintenance
• Snap-on mounting allows installation in any position
• N-conductor capability enhances monitoring accuracy in unbalanced systems

Protection Architecture

• Dual Independent Channels: Separate Umin and Umax monitoring with individual contact outputs
• Configurable Operation: Phase sequence monitoring can be enabled/disabled per application needs
• Precision Control: Digital adjustment ensures accurate and repeatable threshold settings
• Flexible Timing: Independent delay settings prevent false triggering from transient conditions
• Comprehensive Coverage: Monitors phase failure, sequence, voltage levels, and neutral conductor
• Self-Monitoring: Continuous system health verification with fault indication and memory
• Enhanced Diagnostics: Display of actual values and fault types for reliable diagnostics

Network Compatibility

• Unstable Network Support: Designed for applications with variable power quality
• International Compatibility: Wide voltage range accommodates various regional standards
• Mobile System Optimization: Ideal for portable and mobile equipment applications
• Variable Setting Options: Configurable for overshoot, undershoot, or window monitoring
• RESET Behavior: Freely parameterizable reset functions for application-specific requirements

Compliance & Environmental Information

• RoHS Compliance: Since 01.05.2012
• WEEE Take-Back Obligation: Yes
• REACH Article 33: Contains Lead, Lead monoxide (lead oxide), and 6,6'-di-tert-butyl-2,2'-methylenedi-p-cresol in concentrations higher than 0.1% weight by weight. These substances do not pose risk when used as intended.

Classification Data

• eClass 14: 27-37-18-03
• eClass 12: 27-37-18-03
• ETIM 9: EC001441
• UNSPSC 15: 39-12-15-21

Download existing graphical data for this product:

• Product Datasheet
• Equipment Manual - SIRIUS 3UG4 / 3RR2 Monitoring Relays
• SIRIUS 3UG4 / 3RR2 Manual
• SIRIUS Monitoring Relay Application Guide
• SIRIUS Voltage Monitoring Documentation