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PV combiner configuration family
Door-Clutch DC Combiner Boxes
Door-clutch enclosures with DC string aggregation and project-defined protection. This family groups 7 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.
Door-clutch DC string box
- Voltage
- 600/1000V DC
- Input / output
- 1 / 1
- Arrangement
- SPD + isolator
Door-clutch DC string box
- Voltage
- 600/1000V DC
- Input / output
- 2 / 1
- Arrangement
- SPD + isolator
Door-clutch DC string box
- Voltage
- 600/1000V DC
- Input / output
- 2 / 2
- Arrangement
- SPD + isolator
Door-clutch DC string box
- Voltage
- 1000V DC
- Input / output
- 3 / 1
- Arrangement
- current protection + SPD + isolator
Door-clutch DC string box
- Voltage
- 600/1000V DC
- Input / output
- 3 / 3
- Arrangement
- SPD + isolator
Door-clutch DC string box
- Voltage
- 1000V DC
- Input / output
- 4 / 2
- Arrangement
- SPD + isolator
Door-clutch DC string box
- Voltage
- 1000V DC
- Input / output
- 4 / 4
- Arrangement
- SPD + 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 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 →Solar PV / Application guideCombiner Box Selection Guide: How to Choose the Right PV DC Box
Specify a PV DC combiner box from four hard numbers before you look at price: maximum system DC voltage, string short-circuit current (Isc), number of input strings, and site protection class. Fuses must be rated at 1.25 x Isc or above, surge protect
Read Insight →Solar PV / DC-side equipmentSolar Combiner Box vs Junction Box vs DC Circuit Breaker: A Complete Guide
Junction boxes, combiner boxes and DC breakers sit at different points in a PV system and perform different protection, connection and isolation functions.
Read Insight →