Siemens
Siemens 3UG4512-1BR20 Analog Phase Failure and Sequence Monitoring Relay
Siemens 3UG4512-1BR20 Analog Phase Failure and Sequence Relay
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12-Mo Warranty
Same-Day Dispatch
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🎖 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)
Two changeover contacts
6 kV surge voltage resistance
Product description
The Siemens 3UG4512-1BR20 is an analog monitoring relay designed for phase failure and sequence monitoring, featuring two changeover contacts. It operates across a wide voltage range of 3 x 160 to 690V AC.
This relay provides robust protection for three-phase systems against phase loss, incorrect phase rotation, and voltage imbalances. The inclusion of two changeover contacts offers enhanced control flexibility for alarm and interlocking circuits.
Stanlo Automation, a veteran-owned surplus parts distributor, offers the Siemens 3UG4512-1BR20. We are committed to providing quality industrial automation components and reliable service.
Technical specifications
| Type | Analog Monitoring Relay |
| Function | Phase Failure & Sequence Monitoring |
| Voltage | 3 x 160-690 V AC |
| Frequency | 50/60 Hz |
| Contacts | 2 Changeover (DPDT) |
| Terminals | Screw |
Common applications
Three-phase motor protection
Industrial machinery
Control panels
Safety interlocking
Automation systems
Compatible systems
Three-phase power systems
Also known as
Siemens 3UG4512 Phase Relay
Analog Phase Monitor 3UG4512-1BR20
Siemens DPDT Phase Relay
Replaces / compatible with
This is a product phase-out. The preferred successor is 3UG5512-1BR20.
Technical note
Expert tip
The dual changeover contacts provide flexibility for simultaneously controlling multiple circuits or creating interlocking logic.What happens next?
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Frequently asked questions
What is the contact configuration of the Siemens 3UG4512-1BR20 relay?
The Siemens 3UG4512-1BR20 features two changeover contacts (DPDT). This allows for more complex control and signaling arrangements in three-phase system monitoring.