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.

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Product Positioning

The 3UG4513-1BR20 is a Siemens SIRIUS series analog phase sequence monitoring relay. In addition to basic phase loss and phase sequence monitoring, it also provides adjustable undervoltage protection, making it suitable for motor and equipment circuits with high power quality requirements.

Core Product Advantages and Features

Adjustable undervoltage monitoring

In addition to phase loss and phase sequence monitoring, an adjustable undervoltage monitoring function is provided for more comprehensive protection.

Fixed 20% imbalance monitoring

It has a built-in fixed 20% imbalance detection threshold, coupled with a 5% hysteresis setting to reduce false alarms.

Delay time adjustable from 0 to 20 seconds

The trigger delay can be adjusted within the range of 0 to 20 seconds, and the protection timing can be set according to the load characteristics.

LED status indicator

The panel's LED indicator lights can display the monitoring status in real time, making it convenient for on-site personnel to interpret.

project	Specification
model	3UG4513-1BR20
Monitoring function	Phase sequence identification, phase loss detection, adjustable undervoltage monitoring, and fixed 20% imbalance monitoring.
Voltage monitoring range	3x AC 160~690V, 50/60Hz
Hysteresis setting	Fixed 5%
Delay time	Adjustable from 0 to 20 seconds
Output contacts	Two sets of switching contacts (2CO)
Terminal type	Screw terminals
Installation width	22.5mm
Display function	LED indicator light

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