3UG4512-2BR20

The Siemens SIRIUS 3UG4512-2BR20 analog phase sequence monitoring relay is designed to monitor three-phase phase loss and phase sequence errors. It has a monitoring range of 3 x AC160~690V, a zero-delay design for rapid response, and two sets of switching contacts with spring terminals, making it suitable for basic protection applications in general motor circuits.

Share To

Siemens 3UG4512-2BR20 Phase Sequence Monitoring Relay Product Image

Product Positioning

The 3UG4512-2BR20 is a basic analog phase sequence monitoring relay in the Siemens SIRIUS series. It focuses on monitoring phase loss and phase sequence errors and does not have advanced functions such as delay, undervoltage, or imbalance. It is suitable for simple protection needs.

Core Product Advantages and Features

Basic phase sequence protection

It focuses on monitoring two common power supply anomalies: three-phase phase loss and phase sequence error, and responds directly and quickly.

Spring-loaded terminal quick-connect

Spring-loaded terminals can accommodate wires ranging from 0.25 to 1.5 mm², eliminating the need for screws and ensuring high wiring efficiency.

2 sets of switching contact outputs

It provides two sets of switching contacts, which can drive the warning indicator and control circuit respectively.

Wide voltage monitoring range

The monitoring range covers 3x AC160~690V, suitable for motor systems of various voltage levels.

project	Specification
model	3UG4512-2BR20
Monitoring function	Phase sequence identification and phase loss detection (basic type, no delay)
Voltage monitoring range	3x AC 160~690V, 50/60Hz
Output contacts	Two sets of switching contacts (2CO)
Rated current of contacts	AC-15, 3A at 250V/400V
Terminal type	Spring-loaded terminals, 0.25~1.5mm²
Installation width	22.5mm
Installation method	35mm DIN rail clamping

Recommend

3UG4513-1BR20

The Siemens SIRIUS 3UG4513-1BR20 analog phase sequence monitoring relay can monitor phase loss, phase sequence error, undervoltage (adjustable) and fixed 20% imbalance. The monitoring range is 3 x AC160~690V, the delay time is adjustable from 0 to 20 seconds, 2 sets of switching contacts, and the LED display shows the status at a glance.

3UG4512-2AR20

The Siemens SIRIUS 3UG4512-2AR20 analog phase sequence monitoring relay monitors three-phase phase loss and phase sequence errors. It has a monitoring range of 3 x AC160~690V, one set of switching contacts (SPDT) for output, spring-loaded terminals for quick wiring, and a narrow 22.5mm design suitable for distribution panels with limited space.

3UG4512-1BR20

The Siemens SIRIUS 3UG4512-1BR20 analog phase sequence monitoring relay monitors three-phase phase loss and phase sequence errors. It has a monitoring range of 3 x AC160~690V, two sets of switching contacts with screw terminals, and robust and durable wiring. It is a common replacement and upgrade option for existing older models.