For a six-string combiner with 20A breakers per string: 6 × 17. 64A calculated current, requiring a 125A main breaker. NEMA and IP ratings define the mechanical and environmental protection level of the combiner enclosure.
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The PV combiner box is configured with photovoltaic dedicated high-voltage lightning arrester, DC fuse and DC circuit breaker to provide short circuit fault protection and lightning protection.
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Also, please take a look at the list of 16 dc combiner box manufacturers and their company rankings. What Is a DC Combiner Box?.
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A standard combiner box supports 6–24 PV string inputs, with typical current per string ranging from 10–20A. Key features include: Reverse current protection is essential when module shading or mismatched strings cause imbalance. Multiple Layers of Electrical Safety Protection.
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