Since 2010.
And Far From Finished.
Standing Still? Not Our Style.
Discover QFire AC/DC – our new safety shutdown concept for PV systems with battery storage and backup power.
2–3 December 2026 | Messe Düsseldorf | Stand M12
Our Stage: The Innovation Boulevard
QFire AC/DC will be featured on the Innovation Boulevard at Sustainable Solutions Düsseldorf 2026. Our system for coordinated PV string shutdown and isolation of the designated grid and backup power circuits will be presented to an independent expert jury. The jury will select three innovations for nomination for the Best Innovation Award 2026 during the exhibition. Will QFire AC/DC be one of them? We’ll find out in Düsseldorf.
Rethinking Safety. QFire AC/DC.
One Trigger. Coordinated Shutdown of PV Strings and AC Circuits.
PV systems, battery storage and backup power supplies are becoming increasingly interconnected. While this makes energy systems more flexible, it also creates new challenges for electrical safety. With QFire AC/DC, we are taking our proven QFire concept to the next level.
The new system combines DC-side PV string shutdown with the coordinated isolation of designated AC circuits from grid and backup power supplies. When triggered by an external emergency stop or a suitable higher-level control signal, the control box coordinates the operation of the system components.
What Makes It Different:
PV Strings
Galvanic isolation on the DC side using QFire switch boxes.
Grid and Backup Power
Coordinated AC-side isolation via the ATS box.
Central Control
Coordinated operation of all shutdown functions.
One System. Engineered Down to the Last Box.
QFire AC/DC – Ready for Deployment. Built for What Comes Next.
QFire AC/DC is already available with a 63 A ATS box. Additional ATS boxes for higher rated currents are in preparation.
At Sustainable Solutions Düsseldorf 2026, we will present our new shutdown concept and demonstrate how PV strings and designated grid and backup power circuits can be isolated in a coordinated manner.
Innovation Isn’t a Coincidence. It’s How We Work.
Since 2010, we’ve been doing more than building boxes. We’ve been developing solutions.
Sometimes it starts with a specific customer requirement. Sometimes with a technical challenge that doesn’t yet have a suitable solution.
The result? Products designed not just to work on paper, but to meet the demands of real-world installations.
We’re not a large corporation with endless departments. Our development, project planning and manufacturing teams work closely together. That means shorter communication channels, easier coordination and faster progress from idea to solution.
Developed and Manufactured in Germany. Personal Contacts. Smart Engineering.
And yes – more often than not, there’s a box at the end of it.
Engineered for Real-World Applications.
Q3. The Box Makers.
What Else We’re Bringing to Düsseldorf
Our DC combiners and QFire firefighter switches offer a wide range of features – from string current monitoring and optional arc-fault detection to remote-controlled shutdown, PV string fuses, diodes and additional protection functions.
The features you need depend on the requirements of your project.
QFire Firefighter Switches
LITE | BIG | AC/DC
DC Safety Tailored to Your PV System. No Compromises.
From compact rooftop installations to complex, large-scale PV projects, our QFire solutions provide galvanic isolation of PV strings in accordance with IEC 60947-3.
With intelligent control, modular switch boxes and project-specific configuration options.
Custom AC and DC
Connection Solutions
Your Project Doesn’t Fit the Standard Mould? Good.
PV generator junction boxes, DC combiners, AC connection boxes and project-specific connection and protection solutions. We design and manufacture technology to suit your installation – not the other way round.
From technical design to the finished box. All from one source.
Super Multi Box –
Smart DC Combiner
Combine PV Strings. Integrate Protection. Enable Smart Monitoring.
Our Super Multi Box combines DC connection technology and protection functions in a system designed around the requirements of your project.
Depending on the configuration, it offers up to 24 DC inputs, string fuses, surge protection, DC switch-disconnection and communication interfaces such as Modbus.
Q3 Technology in Action
Six selected reference projects demonstrate our solutions in real-world applications. Hover over the images for more information, or select a photo to explore the full project.
The Best Ideas Start with a Conversation.
Two Days in Düsseldorf. Plenty of Good Conversations. And Coffee, of Course.
Whether you’re already working with Q3, planning a challenging project or simply curious about our latest developments, we’d love to meet you.
Sandra and Alica will be there to discuss your projects, technical challenges and new opportunities.
No endless product presentations. No unnecessary complications.
Just a good conversation, straightforward advice and perhaps the first idea for your next project.
Come and Say Hello. We’d Love to See You!
Where to Find Us in Düsseldorf
Sustainable Solutions Düsseldorf 2026
When
Wednesday, 2 December 2026, 9:00 am–5:00 pm
Thursday, 3 December 2026, 9:00 am–5:00 pm
Where?
Messe Düsseldorf
Halls 13 and 14
Stockumer Kirchstraße 61
40474 Düsseldorf
Germany
Q3 Exhibition Stand: M12 | Hall 13
Look for the Q!
Enter the exhibition and keep left. Don’t miss the narrow passage into Hall 13! Head towards the Catering Court, then look up – you’ll spot Q3!
Big Ideas Don’t Need Big Corporations.
They Need People Who Make Them Happen.
Since 2010, we’ve been developing technology at Q3 for an energy sector that’s constantly evolving.
What hasn’t changed? Our curiosity. Our commitment to quality. And our enthusiasm for finding great solutions together with our customers.
Come and Meet Us in Düsseldorf.
Q3. The Box Makers.
Q3. The Box Makers.