SIEMENS LINE MONITORING RELAYS3UG4512-1AR20, Phase ImbalanceB 10% ,1CO ,

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The 3UG4512-1AR20 is a compact line monitoring relay from Siemens designed to monitor 3-phase power systems. It detects phase imbalance (≥10%), phase failure, and incorrect phase sequence, ensuring protection of motors and equipment.


Key Features:

  • Phase imbalance detection: ≥10%

  • Monitors phase loss, sequence, and asymmetry

  • Output Contact: 1 CO (Changeover Contact)

  • Mounting: DIN rail

  • Wide voltage range: 160–690V AC

  • LED indicators for status monitoring

  • Compact design suitable for control panels

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