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Modular
The HISbox generator junction box can be configured precisely to the project. From the number of strings to protection technology and additional functions such as Fireman Switch or monitoring, solutions are created that match the plant layout exactly.
Safe
String fusing, load-break switches, surge protection, and additional safety modules ensure defined, reliable shutdown behavior – both during normal operation and in service or emergency situations.
Smart
Integrated DC monitoring enables continuous monitoring of currents, voltages, temperatures, and the status of protective devices, creating transparency and high O&M efficiency.
Applications
For large solar farms, powerful, configurable combiner solutions are available – including multi-MPPT segmentation and high-current options. These ensure efficient power routing, protection, and transparency in large-scale plants.
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DC combiner boxes – robust, modular DC distribution technology for photovoltaic systems
HISbox DC combiner boxes are modularly configurable generator junction boxesthat combine multiple PV strings, protect cables and inverters, and form the central DC distribution level of modern photovoltaic systems. They ensure clear, service-friendly plant structures and create a durable, standards-compliant DC infrastructure.
Thanks to their modular design, they can be flexibly adapted to different project sizes and technical requirements – from residential rooftop systems to Commercial & Industrial systems through to large Utility Scale solar farms.
The base configuration includes all essential protection and switching functions and forms the foundation of every version. In addition, combiner boxes can be extended with optional function modules such as monitoring, Fireman Switch, multi-MPPT segmentation, or high-current variants.
This creates a powerful, scalable solution that is fully compatible with all leading inverters for PV systems of any size.
Base configuration – the foundation of every DC combiner box
The base configuration represents the core system of every DC combiner box. It includes all necessary protection and switching elements required for safe DC string combining. It serves as the starting point for every further expansion and forms the technical basis of the entire product concept.
Components of the base configuration:
gPV string fusing to prevent reverse currents
DC surge protection Type 2+3 or Type 1+2+3
DC disconnect switch for safe, load-free disconnection
UV-resistant enclosures made of GRP or polycarbonate (IP54–IP65, IK08)
flexible connection options (cable glands, MC4, flying leads)
consistent earthing and equipotential bonding
full compatibility with all common central inverters
This equipment defines the "combiner box" as a reliable base product – regardless of which additional modules are required for a project.
Do you have questions about the configuration? We are happy to advise you.
Expandable function modules
The following modules can be freely combined with the base configuration. They extend the DC combiner box with monitoring, fire protection functions, segmentation, or high-current capability.
The monitoring module extends the DC combiner box with detailed monitoring of DC parameters. Precise measurement of currents, voltages, temperatures, and device states enables early detection of deviations. This simplifies fault diagnosis, enables data-driven maintenance, and improves long-term yield performance – particularly in C&I and Utility Scale projects.
Functions:
Hall sensor measurement per string
Arc fault detection
Insulation monitoring
Voltage and temperature monitoring
SPD and load-break switch status
LCD display
RS485 Modbus/RTU, optional LoRa / WiFi
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Are you planning a PV system and looking for the right DC combiner box configuration? – We will find the optimal solution for your project.
Get in touchSafety in combiner boxes
The safety of a DC combiner box is a central factor for the stability and operational reliability of every photovoltaic system. High voltages are permanently present on the DC side, which is why all components must be designed for defined, reliable protection and shutdown behavior. HISbox combiner boxes integrate all safety-relevant functions necessary for protecting PV strings, cables, and inverters.
Through high-quality gPV fuse protection, robust load-break switches, surge protection, and high-quality enclosure technology, electrical risks are reduced, maintenance is made safer, and the service life of the system is extended.
Monitoring in combiner boxes
Reliable monitoring in the DC combiner box is essential for continuously assessing the condition of the DC system and detecting performance losses at an early stage. Particularly in C&I and Utility Scale projects, DC monitoring enables active, data-driven plant operation. By monitoring string currents, voltage, temperature, and protective devices, deviations can be identified immediately – for example caused by soiled modules, defective connectors, or aged fuses.
You know your requirements for protection and monitoring? Request the right HISbox solution now.
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