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Why DC Combiner Box Is Essential for PV Systems
If you're a solar system buyer, installer, or project manager, let's get straight to the point—you're here because you need a definitive answer: Does your solar system really need a DC combiner box? A
•Small size, high breaking capacity
The circuit breaker has a beautiful appearance, compact size, and high breaking
capacity. It uses the most advanced arc extinguishing and arc transfer technology,
giving the product an extremely high current limiting capability, ensuring the short-circuit
current is quickly cut off.
• Current non-polarity wiring
The product has non-polarity for current, providing reliable protection for both forward
and reverseconnections.
• Arc extinguishing cover and three layers of free metal partition
Zero arc exposure: Equipped with an arc extinguishing cover and three layers of free
metal partition plates, preventing secondary faults caused by arc spraying during breaking.
• Can be used in harsh environments
It can operate reliably within a temperature range of -40°C to +70°C
without derating at +50°C.
• 10KA breaking Capacity
It has a single-phase AC 800-1140 grounding breaking capacity of 10kA.
| Product Model | L | W | H | L1 | L2 | W1 | H1 | H2 | a | b | 4-φd |
| 250/3 315/3 | 200 | 107 | 135 | 10.5 | 9 | 23.5 | 98 | 26 | 35 | 164 | 4.5 |
| 400/3 | 257 | 150 | 156 | 16.5 | 14.5 | 29 | 119 | 39 | 48 | 194 | 7 |
| 630/3 800/3 | 270 | 182 | 158 | 18 | 19 | 41 | 60 | 200 | 60 | 200 | 7 |
| Product Specifications | 250 | 315 | 400 | 630 | 800 | |
| Number of Poles | 3P | |||||
| Rated Operating Current In（A） | 100、125、140、160 180、200、225、250 |
280、300、315 | 250、315、350、400 | 400、500、630 | 630、700、800 | |
| Rated Insulation VoltageUi(V) | AC 1250V | |||||
| Rated Impulse Withstand VoltageUimp(M) | 12k | |||||
| Arc Distance | ≯ 50(0) | ≯ 100(0) | ||||
| Rated Ultimate Short- Circuit Breaking Capacity Icu(kA) |
AC800V | 36.5 | 50 | 50 | 50 | |
| AC1000V | 15 | 15 | 15 | 15 | ||
| AC1140V | 15 | 15 | 15 | 15 | ||
| Rated Service Short- Circuit Breaking Capacity Ics(kA) |
AC800V | 36.5 | 50 | 50 | 50 | |
| AC1000V | 15 | 15 | 15 | 15 | ||
| AC1140V | 15 | 15 | 15 | 15 | ||
| Electrical Life (cycles) | 1500 | 1000 | 1000 | 800 | 500 | |
| Mechanical Life (cycles) | Maintenance-Free | 10000 | 10000 | 7000 | 7000 | 7000 |
| Requires Maintenance |
15000 | 15000 | 10000 | 10000 | 10000 | |
| Dimensions (Length * Width * Height) | 280*107*135(mm) | 307*142*156(mm) | 320*182*158(mm) | |||
| Reference Ambient Temperature (℃) | 40 | |||||
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