Power Quality Device With Fault Recorder Function
Fixed Installed Solutions
Products
The Fixed Installed Power Quality Device
PQI-LV: Enhancing Transparency in the Low-Voltage Grid
PQI-DE: The Fix-Installed Tool for Power Quality Experts
PQI-DA Smart: The Fix-Installed Power Quality Allrounder
PQI-D: The Flexible (*discontinued, can only be ordered until 31.12.2026)
I-Sense: Feeder Current Measurement Technology for up to 16 Feeders
Application Areas
PQSys - Continuous Network Monitoring
»PQSys« – The All-In-One Solution for Power Grid Transparency Across All Voltage Levels
Seamless Power Quality Monitoring from Low Voltage to High Voltage
The permanently installed fault recorders and power quality network analyzers PQI-LV, PQI-DA smart and PQI-DE form the central components of a system that meets all measurement requirements in low, medium and high-voltage networks. The analyzers can function as fault recorders with a scanning rate of up to 41 kHz, as power quality measurement devices to EN 50160 / IEC 61000-2-2/-4 or as power quality analyzers.
The power quality analyzers are ideal for monitoring specific quality standards and agreements between energy suppliers and customers. They also support the monitoring of new technologies such as photovoltaics, e-mobility, battery storage and heat pumps and offer reliable grid monitoring in the low-voltage range, including industrial applications.
All power quality analyzers from A. Eberle are characterized by the highest measurement accuracy of class A according toIEC 61000-4-30 Ed. 4. The standard specifies power quality parameters, measurement methods, time aggregation, accuracy and evaluation, thus guaranteeing reliable, reproducible and comparable measurement results.
Power Quality Analysis Software
For Our Fixed Installed Solutions
WebPQ®
The Easy Way to Analyse Your Power Quality Measurement Data
The new WebPQ® is the central analysis software for all fixed installed fault recorders, power quality monitoring devices and for the evaluation of the portable power quality analysers* from A. Eberle.
*upcoming versionsNEW: Power Quality Services by A. Eberle
We Support You With Your Grid Analysis Projects
Power Quality
Services
Expert Knowledge That Moves You Forward
We offer you power quality audits with troubleshooting in accordance with EN 50160 and IEC 61000 and support you with our expert know-how. As the market leader in the field of mobile power quality devices, we can draw on a wide range of network analyzers with the appropriate accessories for our services.
Our Portfolio at a Glance
»PQSys« - Fixed Installed Power Quality Analysers & Fault Recorders
Quick Comparison:
PQI-LV vs. PQI-DA smart vs. PQI-DE
Find the Right Power Quality Analyzer for Your Application.
PQI-LV
PQI-DA smart
PQI-DE
• Secondary substation
• Depth of the grid (cable-/light-/sub-distributors)
• Industrial power grids (machinery/processes & plants)
• Retrofits
Low-voltage
✔️
10.24 kHz / Optional 40,96 kHz (B1)✔️
✔️
2 kHz to 20 kHz according to IEC61000-4-7 via software option (B1)✔️
CCCI, SSH, HTTP(S)Modbus RTU & TCP (Standard)
✔️
IEC60870-5-104 (P1), IEC61850 (P2), Modbus Master (P3) MQTT*✔️
Radius, RBAC, URM, encryption✔️
1GB ~ 140 weeks with standard template❌
DIN-rail
130 x 90 x 58mm
L x W x HDirect
230 / 400 / 690VRogowski coils & current sensors
350mV input
❌
❌
❌
Optional
• PCC / Point of Common Coupling (IEC 61000-2-2)
• POC / Point of Connection (EN 50160)
• Secondary substation with increased requirements
• Industrial applications
Low-, medium- and high-voltage
✔️
10.24 kHz / Optional 40,96 kHz (B1)✔️
✔️
2 kHz to 20 kHz according to IEC61000-4-7 via software option (B1)✔️
CCCI, SSH, HTTP(S)Modbus RTU & TCP (Standard)
✔️
IEC60870-5-104 (P1), IEC61850 (P2), Modbus Master (P3) MQTT*✔️
Radius, RBAC, URM, encryption✔️
1GB ~ 140 weeks with standard template1.7 inches
DIN-rail,
Front panel installation using adapter
160 x 90 x 58mm
L x W x HDirect and transducer measurement
100 / 230 / 400 / 690V1A/5A measuring transformer (C30)
1A/5A protection transformer (C30)
Rogowski coils (C40)
Sensor technology (C44)
DC (C45)
2 / 2
❌
❌
✔️
• Substations
• Industrial applications
• Grid code compliance
• High-precision frequency measurements
• Residual Current Monitoring (RCM)
Low-, medium- and high-voltage
✔️
10.24 kHz / Optional 40.96 kHz (B1)✔️
✔️
2 kHz to 20 kHz according to IEC61000-4-7 via software option (B1)✔️
CCCI, SSH, HTTP(S)Modbus RTU & TCP (Standard)
✔️
IEC60870-5-104 (P1), IEC61850 (P2), Modbus Master (P3) MQTT*✔️
Radius, RBAC, URM, encryption✔️
1GB ~ 140 weeks with standard template5 inches
Front panel installation
144 x 144
144 x 144 x 90 mm
L x W x HDirect and transducer measurement
Small signal transducer (E3)
1A/5A measuring transformer (C30)
1A/5A protection transformer (C30)
Rogowski coils (C40)
Mini current clamps (C44)
DC (C45)
8 / 4
✔️
5th current feeder (30mA)✔️
PT100 / PT1000 / KTY✔️
News From the Product Group
PQSys - News
Special Publication
Power Quality Monitoring in Buildings - A Key Factor in Modern Building Design
12. November 2025
Discover how Power Quality Monitoring in Buildings improves reliability, efficiency and grid stability. Learn more in our technical article.[...]
Read more
Special Publication
Continuous Power Quality Monitoring in the Jupiter Data Centre - Voltage Quality at Exascale Level
5. November 2025
Read more
General Knowledge
Power in Multiphase Systems
7. August 2025
This technical report highlights the special features of power transmission in three-phase systems and offers valuable insights into the optimisation and analysis of modern power grids.[...]
Read more
Blogpost
Visit From the Rudolf Diesel Technical School at A. Eberle
15. July 2025
We were happy to welcome you, Rudolf-Diesel-Fachschule! Yesterday, we had the pleasure of welcoming two classes of future electrical engineering technicians from the Rudolf-Diesel-Fachschule Nürnberg[...]
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Blogpost
TOP 100 Awards 2025: Innovation for the Energy Future
15. July 2025
💡 As part of the TOP 100 Awards 2025, we were honored to receive a special recognition last week in Mainz – personally presented by TV host and science journalist Ranga Yogeshwar.[...]
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Blogpost
University Excursion: Pentecost Excursion of the Friedrich-Alexander-University Erlangen-Nuremberg (FAU)
14. July 2025
As a company dedicated to innovation, education, and the energy transition, we are pleased to have once again supported the Whitsun excursion of Friedrich-Alexander University Erlangen-Nuremberg (FAU)[...]
Read more
Blogpost
Further Growth at A. Eberle
14. July 2025
Welcome to the team! We welcome our new colleagues at A. Eberle.[...]
Read more
Blogpost
Specialist Training on Power Quality
18. June 2025
On 27 May 2025, everything revolved around electricity, faults and how to recognise them in a specialist training course on power quality at the Balthasar Neumann Technical Centre in Trier (BNT).[...]
Read more
General Knowledge
Measuring the Voltage Drop
23. January 2025
The voltage drop is the difference between the voltage at the beginning and end of an electrical line. In an electrical network, the voltage can be reduced by the resistance and impedance of the lines,[...]
Read more
Product innovation
Product Announcement: »PQI-LV« Released on 05.06.2024
22. January 2025
PQI-LV - cost-efficient class A power quality analyser for precise PQ monitoring in low voltage. Available to order now.[...]
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General Knowledge
Harmonics
17. September 2024
Harmonics are waves whose frequencies are an integer multiple higher or lower than those of the fundamental oscillations. They arise due to non-linear loads in the grid when the electrical voltage is distorted[...]
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Blogpost
International Partner Week 2024 - a Look Back
29. August 2024
Our International Partner Week 2024 - many old friends and new faces were our guests, it was a pleasure.[...]
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General Knowledge
Voltage Monitoring
1. July 2024
Find out everything you need to know about voltage monitoring in this article. What is voltage monitoring, why is voltage monitoring essential for both energy supply companies and industrial companies[...]
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General Knowledge
What Is Load Profile Measurement/Power Measurement?
25. June 2024
This article explains the definition and difference between load profile measurement (RLM), power measurement and measuring the standard load profile. These are important methods for accurately recording[...]
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General Knowledge
Residual Current
6. March 2024
In this article, you will learn about residual current measurement & residual current monitoring and why it is important to measure residual current.[...]
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General Knowledge
Power Quality
6. March 2024
Good power quality is characterized by the fact that the mains voltage actually arriving at the consumer matches the mains voltage promised by the utility company.[...]
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General Knowledge
Reactive Power - Definition, Calculation and Measurement
6. March 2024
The key role of reactive power in electrical engineering: definition, calculation, measurement and the differences to active power and apparent power. Find out how reactive power influences the efficiency[...]
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General Knowledge
What Is Apparent Power and How Is It Calculated?
6. March 2024
This article addresses the question of what apparent power is and how to calculate it. An understanding of apparent power is crucial for the correct dimensioning of inverters and therefore for the optimum[...]
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General Knowledge
Ready for the Smart Grid of the Future?
6. March 2024
All information about smart grids/intelligent power grids, the technology behind them, advantages, disadvantages, challenges and current distribution.[...]
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