Product Description

Siemens SIRIUS Automatic Power Factor Correction Relay (APFC), 12 Stage with LCD Display and RS485 - 7UG0572-1GT20

Product Description

The Siemens 7UG0572-1GT20 is a SIRIUS Automatic Power Factor Correction Relay (APFC Relay) designed for automatic power factor correction in low-voltage electrical systems. This 12-stage APFC relay with LCD display continuously monitors the electrical system and controls capacitor banks to maintain the desired power factor under changing load conditions.

The Siemens 7UG0572-1GT20 power factor controller provides 12-stage automatic capacitor bank control, making it suitable for electrical installations where reactive power demand varies throughout the operating cycle. By automatically switching capacitor stages according to the measured power factor, the relay helps optimize reactive power compensation and supports efficient operation of electrical distribution systems. Siemens' APFC relay range includes selectable 1 A / 5 A current inputs, automatic/linear/rotational switching modes and an LCD version with RS485 communication using Modbus RTU.

The integrated LCD display provides convenient access to operating parameters and settings, making configuration and system monitoring easier for panel operators and maintenance teams. The RS485 Modbus RTU communication interface allows the LCD version to be integrated with suitable energy-management, monitoring and automation systems.

With its 12-stage capacitor control capability, the Siemens 7UG0572-1GT20 is well suited for APFC panels, capacitor bank control, industrial power distribution, commercial electrical installations, manufacturing plants and facilities with fluctuating electrical loads.

Key Features

• Brand: Siemens

• Product Family: SIRIUS 7UG

• Part Number: 7UG0572-1GT20

• Product Type: Automatic Power Factor Correction Relay

• Common Name: APFC Relay / Power Factor Controller

• Stages: 12 Stage

• Display: LCD Display

• Communication: RS485

• Protocol: Modbus RTU

• Current Input: Selectable 1 A / 5 A

• Switching Modes: Automatic / Linear / Rotational

• Application: Automatic Power Factor Correction

• Use: Capacitor Bank Control

• Standard: IEC 60947-5-1

• Compliance: CE and RoHS compliant

Applications

The Siemens 7UG0572-1GT20 APFC relay is suitable for:

• APFC panels

• Automatic power factor correction

• Capacitor bank control

• Industrial power distribution

• Commercial electrical installations

• Manufacturing plants

• Textile industries

• Cement plants

• Steel industries

• Chemical industries

• Automobile industries

• Hospitals and commercial buildings

• HVAC electrical systems

• Industrial automation

• Low-voltage electrical panels

• Reactive power compensation

• Electrical energy management

• Facilities with fluctuating loads

Benefits

• Automatic power factor correction

• Controls up to 12 capacitor stages

• LCD display for easy parameter access

• RS485 communication interface

• Modbus RTU communication support

• Selectable 1 A / 5 A current input

• Automatic capacitor-bank switching

• Linear and rotational switching modes

• Suitable for fluctuating electrical loads

• Helps optimize reactive power compensation

• Supports APFC panel automation

• Simplifies capacitor-stage management

• Suitable for industrial and commercial applications

• Easy integration with monitoring systems

• Compact Siemens SIRIUS solution

• CE and RoHS compliant

• Designed according to IEC 60947-5-1 requirements

Frequently Asked Questions

Q1. What is Siemens 7UG0572-1GT20?
The 7UG0572-1GT20 is a Siemens SIRIUS Automatic Power Factor Correction Relay (APFC Relay) used to automatically control capacitor stages for power factor correction.

Q2. How many stages does the 7UG0572-1GT20 have?
It is a 12-stage APFC relay, allowing automatic control of up to 12 capacitor stages.

Q3. Does Siemens 7UG0572-1GT20 have an LCD display?
Yes. This model is the 12-stage version with an LCD display, providing access to operating parameters and settings.

Q4. Does the APFC relay support RS485 communication?
Yes. The LCD version supports RS485 communication with Modbus RTU protocol.

Q5. What is the purpose of an APFC relay?
An APFC relay automatically switches capacitor-bank stages according to the electrical system's reactive power requirement to maintain the desired power factor.

Q6. Can the 7UG0572-1GT20 be used with capacitor banks?
Yes. It is specifically designed for automatic capacitor-stage control in APFC panels.

Q7. What current input options are available?
The Siemens APFC relay range supports a selectable 1 A / 5 A current input, allowing connection with suitable current transformers.

Q8. Which switching modes are supported?
The APFC relay range supports automatic, linear and rotational switching modes for capacitor banks.

Q9. Where is Siemens 7UG0572-1GT20 commonly used?
It can be used in industrial APFC panels, commercial buildings, manufacturing facilities, electrical distribution systems, factories and other installations with fluctuating loads.

Q10. What is the advantage of 12-stage capacitor control?
Multiple capacitor stages allow the APFC controller to make more granular reactive-power compensation adjustments as the electrical load changes.

Q11. Can the relay be integrated with an energy-management system?
Yes. Its RS485 Modbus RTU communication capability can support integration with compatible monitoring and automation systems.

Q12. Does the LCD display help during commissioning?
Yes. The LCD interface provides convenient access to parameters and operating information, helping simplify configuration and maintenance.

Q13. Is the 7UG0572-1GT20 suitable for industrial applications?
Yes. It is designed for low-voltage power distribution and automatic power factor correction applications, including industrial installations.

Q14. What is the difference between 7UG0572-1GT20 and 7UG0572-1GT21?
The 7UG0572-1GT20 is the 12-stage LCD-display version, while 7UG0572-1GT21 is the 12-stage LED-display version.

Q15. Can it be used in an APFC panel?
Yes. The 7UG0572-1GT20 is specifically intended for automatic power factor correction and capacitor-bank control, making it suitable as the controller in an APFC panel.

Q16. Does automatic power factor correction help with fluctuating loads?
Yes. Automatic capacitor-stage switching allows the APFC system to respond to changing reactive-power requirements, helping maintain the target power factor under fluctuating loads.

Q17. What communication protocol does the LCD version use?
The LCD version supports Modbus RTU over RS485, subject to the applicable system configuration.

Q18. Is Siemens 7UG0572-1GT20 CE and RoHS compliant?
The current Siemens price-list information identifies the APFC relay range as CE and RoHS compliant and states conformity with IEC 60947-5-1.