PV-Fuse

In PV systems consisting of arrays with N>4 module strings fault current can easily exceed the operating current. The current can reach a level that can cause overheating and damage of wire insulation.

To ensure the best possible protection for the system and people working on the equipment, each string of solar panels MUST be protected with one fuse on each "+" and "- " terminal.

These fuses will only isolate the fault string. So the rest of the PV system can continuously generate electricity.

When a fault occurs in the DC circuit of the PV system the absence of natural zero crossing makes the interruption of DC fault more difficult than the inte interruption of AC faults as only the fuse are will force the current to decrease to zero.