Three-phase monitoring relay with spring-loaded terminals and two change-over contacts for 160–690 V AC networks.
The Siemens 3UG4512-2BR20 is a SIRIUS 3UG4 analog phase monitoring relay for three-phase networks from 160 to 690 V AC at 50 to 60 Hz. It monitors phase sequence, phase failure and a fixed 10% phase asymmetry threshold, using automatic reset, closed-circuit operation and two change-over contacts.
| Manufacturer | Siemens |
| Exact Part Number | 3UG4512-2BR20 |
| Product Family | SIRIUS 3UG4 Phase Monitoring Relay |
| Lifecycle | Not stated for this exact order number in the referenced official documents |
| Supply Review | Availability, configuration and warranty terms are verified against the requested quantity |
| Parameter | Verified value for 3UG4512-2BR20 |
| Monitored network | Three-phase AC |
| Rated monitoring range | 160–690 V AC |
| Rated frequency | 50–60 Hz |
| Monitoring functions | Phase sequence, phase failure and phase asymmetry |
| Asymmetry threshold | Fixed at 10% |
| Reset behavior | Automatic reset |
| Operating principle | Closed-circuit principle |
| Output contacts | 2 change-over contacts |
| Terminal system | Spring-loaded terminals |
| Display | LED indication |
| Degree of protection | IP20 |
| Rated insulation voltage | 690 V; overvoltage category III; pollution degree 3 |
| Rated surge withstand voltage | 6 kV |
| Maximum thermal contact current | 5 A |
| Typical mechanical service life | 10 million operating cycles |
| Maximum response time | 450 ms |
| Typical weight | 0.140 kg |
| Official successor mapping | 3UG5512-2BR20 |
| Official technical source | Siemens SIRIUS 3UG5 conversion information and Siemens Industrial Controls catalog IC12 |
Detects incorrect phase order before it affects connected equipment.
Provides relay output response when a phase is lost.
Supervises a fixed 10% asymmetry condition in three-phase systems.
The referenced Siemens documents identify 3UG5512-2BR20 as the successor to 3UG4512-2BR20 but do not state an official lifecycle label for the exact predecessor order number. Do not convert this mapping into an inferred Discontinued status.
It monitors phase sequence, phase failure and fixed 10% phase asymmetry.
The rated monitoring range is 160 to 690 V AC.
The relay provides two change-over contacts.
This order number uses spring-loaded terminals.
Siemens maps the predecessor to 3UG5512-2BR20; compatibility must still be checked before replacement.
Send the complete part number, installed system details and required quantity. We will check supply availability, configuration compatibility, global delivery options and warranty terms.
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We review the installed system, application details and replacement constraints before order confirmation.
Our team checks the complete order number, interface, configuration and visible product identification.
Industrial parts are checked, securely packed and prepared for traceable international delivery.
Send the complete part number, installed system details and required quantity. We will check supply availability, configuration compatibility, global delivery options and warranty terms.
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Send the complete part number, installed system details and required quantity. We will check supply availability, configuration compatibility, global delivery options and warranty terms.
