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Reviewed configuration
NHSZ AFCI combiner box
A DC configuration with - input and - output boundary. Confirm the project specification before release.
Source-backed technical data
Complete configuration parameters, not only a model summary.
The table below is transcribed from the approved catalogue technical sheet for this configuration. The final drawing, BOM and inspection scope remain subject to the agreed project specification.
Configuration summary
| Model | NHSZ |
|---|---|
| Configuration type | AFCI combiner box |
| Voltage class | DC |
| Input count | - |
| Output count | - |
| Protection / switching architecture | arc-fault detection + shutdown |
Technical specifications
| Max Rated Voltage | 600VDC / 1000VDC |
|---|---|
| Number of Input | 8 / 12 / 16 |
| Max Input Current Per Each String | 10A / 15A / 20A / 25A / 30A |
| Connection Type of Input | PG09, MC4 |
| Input Cable Size | Ø4-8mm |
| Max Output Current | NHSZ-8/1: 100A / 125A / 250A; NHSZ-12/1: 125A / 160A / 200A / 250A; NHSZ-16/1: 200A / 250A / 315A / 350A / 500A |
| Connection Type of Output | PG 36, Ø22-32mm |
| DC Surge Arrester | T2/T1+2, In=20KA, Imax=40KA, Ucpv=600VDC / 1000VDC |
| Voltage of Monitoring Device | 450VDC ~ 1000VDC |
| Voltage of Contactor | 24VDC (Built-in Power Supply) |
| Enclosure | Plastic, Powder Coated Stainless Steel |
| Protection Degree | NEMA13 (IP65) |
| Ambient Temperature | -20°C ~ +60°C |
| Humidity | 0-99% |
| Altitude | ≤2000m (derating > 2000m) |
| Installation method | Vertical / Horizontal |
| Standard | IEC62109 / IEC61439 (EN62109 / EN61439) |
Technical context
Use the relevant selection guide before finalizing the scope.
DC Arc-Fault Protection for PV: AFCI in Combiner Boxes
A DC arc in a PV system can reach thousands of degrees and ignite surrounding material within moments. Unlike AC, a DC arc does not self-extinguish at a zero crossing, so it can sustain as long as the array keeps supplying current.
Read Insight →Solar PV / Protection guideNEC 690.12: Module-Level Rapid Shutdown Requirements
NEC 690.12 exists to protect anyone who might touch a PV array during an emergency. Its core idea is that the DC side should be controllable and reducible to a safe voltage, not left permanently live.
Read Insight →