AC surge box AC connection and surge protection boxes for commercial and large systems
Typical areas of application for Q3 AC boxes
- Commercial photovoltaic systems from 50 kWp
- Large agricultural roof systems
- Industrial and production sites
- Ground-mounted systems with direct transformer station connection
📥 Download Technische Daten AC-Anschlussbox Q3‑AC‑BOX-TN-C(‑S) 160 A (PDF, 537 KB)
📥 Download Technische Daten AC-Anschlussbox Q3‑AC‑BOX-TN-C(‑S) 250 A (PDF, 541 KB)
📥 Download Technische Daten AC-Anschlussbox Q3‑AC‑BOX-TN-C(‑S) 400 A (PDF, 540 KB)
📥 Download Technische Daten AC-Anschlussbox Q3‑AC‑BOX-TN-C(‑S) 630 A (PDF, 539 KB)
Tailor-made design
– adapted to the specific application (network type, power and cable cross-sections)
High current-carrying capacity
– also suitable for large cable cross-sections (e.g. NYY-J 4 × 300 mm²)
AC Box for all network types
– TN-C, TN-C-S or other variants on request
Customer-specific, ready-to-install delivery
– AC Box preassembled and tested
Reliable protection
– e.g. surge protection type 1+2+3 with upstream fuse disconnector
Made in Germany
- planned and manufactured in 87600 Kaufbeuren | Allgäu
AC connection and surge protection boxes for private customers, commercial and large systems
Secure grid connection for high-performance photovoltaic systems
Our AC junction boxes reliably connect photovoltaic inverters to the grid connection point or transformer station - tailored to the requirements of the private, commercial, industrial and agricultural sectors.
Whether on the roof of a production hall, in a logistics center or in a ground-mounted system - we supply custom-made AC junction boxes (e.g. with integrated overvoltage protection) for maximum operational reliability.
Typical Applications
AC Box
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Photovoltaic (commercial) systems from 10 kWp
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Large agricultural rooftop installations
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Industrial and production sites
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Ground-mounted systems with direct transformer station connection
Why our AC boxes
are the right choice
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Individual planning for every system
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Long-term protection against downtime costs due to overvoltage
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Standard-compliant design in accordance with current VDE and IEC specifications
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Direct contact person from planning to delivery
An AC Box is born – individually designed and manufactured
1. Base plate and mounting panel of the AC Box
It all starts with a solid mounting plate. It forms the foundation for the secure installation of all electrical components and ensures maximum stability during operation.
2. Customer-specific design of busbars
Depending on the project requirements, copper busbars are precisely dimensioned and mounted with insulation.
This creates a low-loss and reliable power distribution system, perfectly matched to the respective installation.
3. Integration of protection and switching components
Surge protection devices, fuses and terminal blocks are selected according to customer specifications and applicable standards.
Each component is professionally installed and wired to ensure that the AC Box meets all safety, compliance and operational requirements.
4. Individual wiring and grounding
All cables are routed in accordance with standards.
Grounding and equipotential bonding are designed individually for each project, ensuring maximum safety — perfectly tailored to your application.
5. Final assembly in the enclosure
Finally, the complete unit is installed in a robust steel enclosure.
Cable glands, grounding connections and covers are adapted to the project-specific requirements.
The result: a custom-built AC Box, ready for immediate use.
Important:
Each AC Box from Q3 ENERGIE is individually engineered and manufactured for the specific project. For every inquiry, we develop the optimal solution — from standard configurations to complex custom designs.
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Module string disconnection up to 20 A at 1,500 V DC per string
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Compact, standardised or customised – for every PV system
AC Boxes
Tailor-made and reliable protection – for all grid types