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PV combiner configuration family
DC Isolator Switch Boxes
Isolation and string-side switching for defined DC circuits. This family groups 4 reviewed configurations by voltage, input/output topology and protection architecture.
Configuration matrix
Compare the electrical boundary before selecting a model.
Values shown are source-backed configuration identifiers. Final component selections, ratings, drawings and documents are confirmed against the project specification.
DC isolator switch box
- Voltage
- 1000V DC
- Input / output
- 4/2 / 4/2
- Arrangement
- isolator
DC isolator switch box
- Voltage
- 1000V DC
- Input / output
- 3/6 / 3/6
- Arrangement
- isolator
DC string box
- Voltage
- 1000V DC
- Input / output
- 3 / 3
- Arrangement
- fuse + isolator
DC string box
- Voltage
- 1000V DC
- Input / output
- 6 / 6
- Arrangement
- isolator
Technical reading
Continue with the engineering question behind the configuration.
How to Choose a Solar Combiner Box: B2B Buyer Guide (2026)
Choose a solar combiner box by fixing system voltage, string count, output current, protection, enclosure conditions and monitoring in that order.
Read Insight →Solar PV / Technical guideWhat Is a Combiner Box? A Solar String Management Guide
What a PV combiner box does, what sits inside it, and how to size strings, fuses, SPDs and IP rating for solar plants. NEUTRON factory guide.
Read Insight →Electrical Protection / Selection guideDC Surge Protection in PV Systems: Sizing SPDs for 1500 V
A PV array is effectively a large, elevated conductor network spread across a field or rooftop. Three mechanisms inject overvoltage into the DC side:
Read Insight →Solar PV / Technical guidePV String Protection Basics: gPV Fuses & Monitoring
Where PV strings are paralleled, healthy strings can backfeed a faulted string, so the prospective fault current is not limited to a single module. The protection task is to clear that fault fast while never interrupting normal operation. Three realities drive the design:
Read Insight →