The Siemens 7UG0712-1AA20 is a 3-phase self-powered line monitoring relay designed to provide reliable monitoring and protection of three-phase electrical systems. This compact 17.5 mm DIN rail-mounted control relay continuously monitors phase conditions and helps safeguard motors, machinery, and electrical installations from supply abnormalities.
Operating directly from the monitored voltage, the relay features a self-powered design, eliminating the need for an external auxiliary power supply. It is suitable for systems operating within a voltage range of 154–500V AC, making it ideal for a wide variety of industrial and commercial applications.
The relay continuously checks critical parameters such as phase failure, phase sequence, phase asymmetry, and voltage conditions, helping prevent equipment damage caused by incorrect phase rotation or supply disturbances.
Its slim 17.5 mm housing enables space-saving installation in control panels, motor control centers (MCCs), distribution boards, and industrial automation systems. The Siemens 7UG series is known for its reliability, easy installation, and long operational life in demanding environments.
• Genuine Siemens line monitoring relay
• Model: 7UG0712-1AA20
• 3-phase self-powered operation
• Operating voltage range: 154–500V AC
• Monitors phase failure and phase sequence
• Detects voltage asymmetry conditions
• Compact 17.5 mm DIN rail housing
• No external auxiliary supply required
• Suitable for industrial control and protection systems
• High reliability and long service life
• Easy installation and commissioning
| Parameter | Specification |
|---|---|
| Product Series | Siemens 7UG |
| Model Number | 7UG0712-1AA20 |
| Product Type | 3-Phase Line Monitoring Relay |
| Operating Voltage | 154–500V AC |
| Power Supply | Self-Powered |
| Monitoring Functions | Phase Failure, Phase Sequence, Voltage Monitoring |
| Mounting Type | DIN Rail Mount |
| Module Width | 17.5 mm |
| Phase Configuration | Three Phase |
| Application | Motor & Power System Protection |
| Usage | Industrial & Commercial Control Panels |
| Brand | Siemens |
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