Application
The BFPV type fuses are suitable for lines with rated DC voltage up to 1500V and rated current up to 630A.
It’s provide short-circuit protection for
* connected in series and parallel with photovoltaic panels and batteries
* the charging and converter system
* photovoltaic power plants, inverter and rectifier systems
* photovoltaic power generation system surge current
rated breaking capacity up to 50kA.
It’s comply with China national standard GB/T13539.6, IEC60269-6.
Normal working conditions
2.1 The effect of current
The upper limit of ambient air temperature should not exceed 90℃; the lower limit of ambient air temperature should not be lower than -50℃; the altitude of the installation site should not exceed 2000m (if you want to exceed this 2000m, you need to indicate the requirements, and the company can design and develop according to customer requirements).
PV fuse link derating table for installation
| Installation altitude（m） |
Percentage of current derating （A） |
Percentage of Insulation performance derating（V） |
| 2000 |
100% |
100% |
| 3000 |
95% |
90% |
| 4000 |
90% |
80% |
| 5000 |
85% |
70% |
For example: the rated current is 18A and the installation site altitude is 5000m, the actual selection is 18*85%≈15.3A.
2.2 The effect of Voltage
The rated voltage of photovoltaic fuses does not need to be derated for installation altitudes not exceeding 5000m, but it is affected by air pressure on the power frequency withstand voltage and insulation performance to a certain extent. The test voltage of DC 1001-1500V is 3820V, and Our products reach at least 6000V, so here is no need to consider.
2.3 The effect of temperature
The following figure shows a typical curve of the influence of ambient temperature on current carrying capacity:
| T(℃) |
A |
Ambient temperature-bearing capacity curve |
| -20 |
1.10 |
Curve A: photovoltaic fuse link curve |
| -10 |
1.08 |
| 0 |
1.06 |
| 10 |
1.03 |
| 20 |
1.00 |
| 30 |
0.96 |
| 40 |
0.92 |
| 50 |
0.88 |
| 60 |
0.84 |
| 70 |
0.78 |
| 80 |
0.72 |
For example: In some applications, the ambient temperature is 20°C, and the rated current of the photovoltaic (gPV type) fuse is selected as 63A. Now, the above-mentioned fuse is often used in a high temperature environment of 70 ℃, then the fuse must be derated. The environmental bearing capacity curve A in the figure shows that the percentage of the rated operating value at 70°C is 0.78, that is to say, the rated current value of the fuse should be reselected:
Choose 80A according to the standard current level of the fuse.
Use category
“gPV” refers to a DC fuse with a full range of breaking capacity for overcurrent protection of solar photovoltaic systems.
Structural features
The variable cross-section melt made of silver flakes is encapsulated in a high-strength melt tube. The melt tube is filled with chemically treated high-purity quartz sand and special treatment chemicals as the arc extinguishing medium. The welding and the contacts are firmly electrically connected.
