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- - SIEMENS 3UG4512-1AR20 Monitoring Relay
    
    Product Overview
    
    SIEMENS 3UG4512-1AR20 is a SIRIUS line monitoring relay / phase monitoring relay designed for three-phase electrical systems. It monitors phase failure and phase sequence to protect motors and electrical equipment from incorrect phase conditions.
    
    The relay is used for monitoring 3-phase AC voltage systems from 160 V to 690 V AC (50/60 Hz) and provides a relay output contact for alarm or control functions.
    
    Specifications
    - Brand: SIEMENS
    - Series: SIRIUS 3UG
    - Model: 3UG4512-1AR20
    - Product Type: Monitoring Relay / Phase Monitoring Relay
    - Function:
      - Phase Failure Monitoring
      - Phase Sequence Monitoring
    - Monitoring Voltage: 3 × 160...690 V AC
    - Frequency: 50/60 Hz
    - Output Contact: 1 Changeover Contact (SPDT)
    - Contact Rating:
      - AC-15: 3 A at 250/400 V AC
      - DC-13: 1 A at 24 V DC
    - LED Status Display: Yes
    - Mounting: DIN Rail Mounting
    - Connection: Screw Terminals
    - Protection Rating: IP20
    - Operating Temperature: -20...65 °C
    - Weight: Approx. 119 g
    Advantages & Features
    - Reliable monitoring of three-phase power systems
    - Detects phase loss and incorrect phase sequence
    - Protects motors from reverse rotation and phase faults
    - Compact DIN rail installation design
    - LED indication for easy troubleshooting
    - Simple integration into control cabinets
    - High switching reliability for industrial applications
    - Suitable for motor protection and automation systems
    Applications
    - Motor protection systems
    - Pump control systems
    - Fan and compressor protection
    - Industrial control cabinets
    - Factory automation equipment
    - Three-phase power monitoring systems
    - HVAC and machinery applications
    Precautions
    - Confirm the monitored voltage range before installation
    - Ensure correct phase wiring sequence
    - Install according to electrical safety regulations
    - Check relay contact rating before connecting loads
    - Disconnect power before wiring or maintenance
    - Verify operation after installation