SIEMENS 3UG4512-1AR20 Monitoring Relay

Product Description

The SIEMENS 3UG4512-1AR20 is a SIRIUS 3UG4 Line Monitoring Relay (Phase Monitoring Relay) designed for monitoring three-phase electrical systems. It detects phase failure, phase sequence, and phase asymmetry faults to protect motors and industrial equipment from abnormal power conditions.

This relay is suitable for DIN rail mounting and provides a reliable monitoring solution for industrial control panels, motor protection systems, and automation applications. The model has been discontinued, with 3UG5512-1AR20 recommended as the successor.

Detailed Specifications

Advantages & Features

• Original Siemens SIRIUS monitoring relay
• Monitors three-phase power supply conditions
• Detects phase loss and incorrect phase sequence
• Provides phase asymmetry monitoring
• Compact DIN rail installation design
• LED status indication for quick diagnostics
• Reliable protection for motors and electrical equipment
• Suitable for industrial automation applications

Applications

• Motor protection systems
• Industrial control cabinets
• Pump and fan control systems
• Factory automation equipment
• Conveyor systems
• Machine tools
• Electrical distribution monitoring

Precautions

• Confirm the three-phase voltage range before installation.
• Ensure correct phase wiring sequence.
• Verify relay settings according to equipment requirements.
• Disconnect power before wiring or replacement.
• This device is a monitoring relay, not a power relay or circuit breaker.
• Check replacement compatibility because this model has been phased out and replaced by 3UG5512-1AR20.