Siemens
Siemens 3UG4512-1AR20 Analog Phase Failure and Sequence Monitoring Relay
Siemens 3UG4512-1AR20 Analog Phase Failure and Sequence Relay
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12-Mo Warranty
Same-Day Dispatch
Ships Worldwide
🎖 Veteran-Owned
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Response within 1 business hour
12-month warranty
All units tested
Same-day dispatch
Order by 2pm CST
Worldwide delivery
US, EU, Asia, Middle East
Veteran-owned
CAGE: 9NK75
Phase failure detection
Phase sequence recognition
Wide voltage range (160-690V AC)
6 kV surge voltage resistance
10,000,000 operating cycles
Product description
The Siemens 3UG4512-1AR20 is an analog monitoring relay designed for phase failure and sequence monitoring. It operates across a wide voltage range of 3 x 160 to 690V AC and features one changeover contact.
This relay is critical for protecting three-phase systems from issues like phase loss, incorrect phase rotation, and voltage imbalances, which can lead to equipment damage. Its broad voltage range makes it versatile for various industrial applications.
Stanlo Automation, a veteran-owned surplus parts distributor, offers the Siemens 3UG4512-1AR20. We are committed to providing reliable industrial automation components and excellent customer service.
Technical specifications
| Type | Analog Monitoring Relay |
| Function | Phase Failure & Sequence Monitoring |
| Voltage | 3 x 160-690 V AC |
| Frequency | 50/60 Hz |
| Contacts | 1 Changeover |
| Terminals | Screw |
Common applications
Three-phase motor protection
Industrial machinery
Power distribution systems
Automation control
Protecting sensitive equipment
Compatible systems
Three-phase power systems
Also known as
Siemens 3UG4512 Phase Relay
Analog Phase Monitor 3UG4512-1AR20
Siemens Wide Range Phase Relay
Replaces / compatible with
This is a product phase-out. The preferred successor is 3UG5512-1AR20.
Technical note
Expert tip
The extensive voltage range of this relay makes it suitable for diverse industrial power grids and applications.What happens next?
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Frequently asked questions
What is the operating voltage range of the Siemens 3UG4512-1AR20 relay?
The Siemens 3UG4512-1AR20 monitors three-phase systems within a broad voltage range of 160 to 690V AC. This wide range allows for flexibility in various industrial power systems.