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
Blogpost
Power Quality Analyzer Guide: Your Entry Point for 2026
29. January 2026
Comprehensive 2026 guide to power quality analysers: selection criteria, applications, standards, and future trends for reliable power quality monitoring.[...]
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Webinar
»Cyber Security« Webinar: A Challenge for European Energy Companies
3. December 2025
Webinar recording from 2025-11-26: »Cyber Security« - A Challenge for European Energy Companies[...]
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Blogpost
A. Eberle at the Schwabach City Run 2025
24. November 2025
A. Eberle was represented by 37 participants at the 2025 Schwabach City Run, setting a new internal record for participation. Particularly noteworthy is Benjamin Rentsch's first place in the M 35 40 age[...]
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General Knowledge
Total Harmonic Distortion (THD) in Low Voltage Networks
20. November 2025
This study examines harmonic distortion in modern low-voltage grids, showing real measurement data, key standards (EN 50160, IEC 61000-3-2/-4-30) and practical ways to reduce THD in applications such as[...]
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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.[...]
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Special Publication
Continuous Power Quality Monitoring in the Jupiter Data Centre - Voltage Quality at Exascale Level
5. November 2025
Read more
Webinar
»PQSys« Webinar: »WebPQ®« - The New Power Quality Software for Continuous Grid Monitoring
27. October 2025
Webinar recording from 2025-09-25: »PQSys« Webinar: »WebPQ®« - The New Power Quality Software for Continuous Grid Monitoring [...]
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)[...]
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Blogpost
Further Growth at A. Eberle
14. July 2025
Welcome to the team! We welcome our new colleagues at A. Eberle.[...]
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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).[...]
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Webinar
»PQSys« Webinar: PQ-Monitoring & Feeder Current Measurement in Low-Voltage Grids 3
19. May 2025
Webinar recording from 2025-05-14: »PQSys - PQ-Monitoring & Feeder Current Measurement in Low-Voltage Grids - part 3«. [...]
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Webinar
»PQSys« Webinar: Presentation: »PQI-LV« - The New PQ-Analyser for Transparency in the Low-Voltage Grid
4. March 2025
Webinar recording from 2025-02-19: »PQSys - Presentation: »PQI-LV« - The New PQ-Analyser for Transparency in the Low-Voltage Grid«. [...]
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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,[...]
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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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Training Video
»PQSys« Training Video 1: Presentation New Functions of Firmware V3.2 for PQI-LV, PQI-DA smart & PQI-DE
17. January 2025
In this video, we present the new functions and extended options with firmware version 3.2 for our fixed installed power quality analysers and fault recorders PQI-LV, PQI-DA smart and PQI-DE of the PQSys[...]
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Webinar
»EOR-3DS« & »PQSys« Webinar: Digitise and monitor local network substations for the future with »EOR-3DS« & »PQSys«
15. October 2024
Webinar recording from 2024-10-10: »EOR-3DS« & »PQSys - Digitise and monitor local network substations for the future with »EOR-3DS« & »PQSys««. [...]
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